abstract class FilterPluginBase in Drupal 9

Base class for Views filters handler plugins.

Hierarchy

• class \Drupal\Component\Plugin\PluginBase implements DerivativeInspectionInterface, PluginInspectionInterface
  • class \Drupal\Core\Plugin\PluginBase uses DependencySerializationTrait, MessengerTrait, StringTranslationTrait
    • class \Drupal\views\Plugin\views\PluginBase implements DependentPluginInterface, ContainerFactoryPluginInterface, TrustedCallbackInterface, ViewsPluginInterface
      • class \Drupal\views\Plugin\views\HandlerBase implements ViewsHandlerInterface
        • class \Drupal\views\Plugin\views\filter\FilterPluginBase implements CacheableDependencyInterface

Related topics

Views filter handler plugins

Plugins that handle views filtering.

9 files declare their use of FilterPluginBase

Access.php in core/modules/node/src/Plugin/views/filter/Access.php

FilterExceptionTest.php in core/modules/views/tests/modules/views_test_data/src/Plugin/views/filter/FilterExceptionTest.php

FilterTest.php in core/modules/views/tests/modules/views_test_data/src/Plugin/views/filter/FilterTest.php

HistoryUserTimestamp.php in core/modules/history/src/Plugin/views/filter/HistoryUserTimestamp.php

Search.php in core/modules/search/src/Plugin/views/filter/Search.php

... See full list

File

core/modules/views/src/Plugin/views/filter/FilterPluginBase.php, line 46

Namespace

Drupal\views\Plugin\views\filter

abstract class FilterPluginBase extends HandlerBase implements CacheableDependencyInterface {

  /**
   * Contains the actual value of the field,either configured in the views ui
   * or entered in the exposed filters.
   */
  public $value = NULL;

  /**
   * Contains the operator which is used on the query.
   *
   * @var string
   */
  public $operator = '=';

  /**
   * Contains the information of the selected item in a grouped filter.
   */
  public $group_info = NULL;

  /**
   * @var bool
   * Disable the possibility to force a single value.
   */
  protected $alwaysMultiple = FALSE;

  /**
   * @var bool
   * Disable the possibility to use operators.
   */
  public $no_operator = FALSE;

  /**
   * @var bool
   * Disable the possibility to allow an exposed input to be optional.
   */
  public $always_required = FALSE;

  /**
   * Overrides \Drupal\views\Plugin\views\HandlerBase::init().
   *
   * Provide some extra help to get the operator/value easier to use.
   *
   * This likely has to be overridden by filters which are more complex
   * than simple operator/value.
   */
  public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
    parent::init($view, $display, $options);
    $this->operator = $this->options['operator'];
    $this->value = $this->options['value'];
    $this->group_info = $this->options['group_info']['default_group'];

    // Set the default value of the operator ID.
    if (!empty($options['exposed']) && !empty($options['expose']['operator']) && !isset($options['expose']['operator_id'])) {
      $this->options['expose']['operator_id'] = $options['expose']['operator'];
    }
    if ($this
      ->multipleExposedInput()) {
      $this->group_info = array_filter($options['group_info']['default_group_multiple']);
      $this->options['expose']['multiple'] = TRUE;
    }

    // If there are relationships in the view, allow empty should be true
    // so that we can do IS NULL checks on items. Not all filters respect
    // allow empty, but string and numeric do and that covers enough.
    if ($this->view->display_handler
      ->getOption('relationships')) {
      $this->definition['allow empty'] = TRUE;
    }
  }
  protected function defineOptions() {
    $options = parent::defineOptions();
    $options['operator'] = [
      'default' => '=',
    ];
    $options['value'] = [
      'default' => '',
    ];
    $options['group'] = [
      'default' => '1',
    ];
    $options['exposed'] = [
      'default' => FALSE,
    ];
    $options['expose'] = [
      'contains' => [
        'operator_id' => [
          'default' => FALSE,
        ],
        'label' => [
          'default' => '',
        ],
        'description' => [
          'default' => '',
        ],
        'use_operator' => [
          'default' => FALSE,
        ],
        'operator' => [
          'default' => '',
        ],
        'operator_limit_selection' => [
          'default' => FALSE,
        ],
        'operator_list' => [
          'default' => [],
        ],
        'identifier' => [
          'default' => '',
        ],
        'required' => [
          'default' => FALSE,
        ],
        'remember' => [
          'default' => FALSE,
        ],
        'multiple' => [
          'default' => FALSE,
        ],
        'remember_roles' => [
          'default' => [
            RoleInterface::AUTHENTICATED_ID => RoleInterface::AUTHENTICATED_ID,
          ],
        ],
      ],
    ];

    // A group is a combination of a filter, an operator and a value
    // operating like a single filter.
    // Users can choose from a select box which group they want to apply.
    // Views will filter the view according to the defined values.
    // Because it acts as a standard filter, we have to define
    // an identifier and other settings like the widget and the label.
    // This settings are saved in another array to allow users to switch
    // between a normal filter and a group of filters with a single click.
    $options['is_grouped'] = [
      'default' => FALSE,
    ];
    $options['group_info'] = [
      'contains' => [
        'label' => [
          'default' => '',
        ],
        'description' => [
          'default' => '',
        ],
        'identifier' => [
          'default' => '',
        ],
        'optional' => [
          'default' => TRUE,
        ],
        'widget' => [
          'default' => 'select',
        ],
        'multiple' => [
          'default' => FALSE,
        ],
        'remember' => [
          'default' => 0,
        ],
        'default_group' => [
          'default' => 'All',
        ],
        'default_group_multiple' => [
          'default' => [],
        ],
        'group_items' => [
          'default' => [],
        ],
      ],
    ];
    return $options;
  }

  /**
   * Display the filter on the administrative summary.
   */
  public function adminSummary() {
    return $this->operator . ' ' . $this->value;
  }

  /**
   * Determine if a filter can be exposed.
   */
  public function canExpose() {
    return TRUE;
  }

  /**
   * Determine if a filter can be converted into a group.
   * Only exposed filters with operators available can be converted into groups.
   */
  protected function canBuildGroup() {
    return $this
      ->isExposed() && count($this
      ->operatorOptions()) > 0;
  }

  /**
   * Returns TRUE if the exposed filter works like a grouped filter.
   */
  public function isAGroup() {
    return $this
      ->isExposed() && !empty($this->options['is_grouped']);
  }

  /**
   * Provide the basic form which calls through to subforms.
   * If overridden, it is best to call through to the parent,
   * or to at least make sure all of the functions in this form
   * are called.
   */
  public function buildOptionsForm(&$form, FormStateInterface $form_state) {
    parent::buildOptionsForm($form, $form_state);
    if ($this
      ->canExpose()) {
      $this
        ->showExposeButton($form, $form_state);
    }
    if ($this
      ->canBuildGroup()) {
      $this
        ->showBuildGroupButton($form, $form_state);
    }
    $form['clear_markup_start'] = [
      '#markup' => '<div class="clearfix">',
    ];
    if ($this
      ->isAGroup()) {
      if ($this
        ->canBuildGroup()) {
        $form['clear_markup_start'] = [
          '#markup' => '<div class="clearfix">',
        ];

        // Render the build group form.
        $this
          ->showBuildGroupForm($form, $form_state);
        $form['clear_markup_end'] = [
          '#markup' => '</div>',
        ];
      }
    }
    else {

      // Add the subform from operatorForm().
      $this
        ->showOperatorForm($form, $form_state);

      // Add the subform from valueForm().
      $this
        ->showValueForm($form, $form_state);
      $form['clear_markup_end'] = [
        '#markup' => '</div>',
      ];
      if ($this
        ->canExpose()) {

        // Add the subform from buildExposeForm().
        $this
          ->showExposeForm($form, $form_state);
      }
    }
  }

  /**
   * Simple validate handler.
   */
  public function validateOptionsForm(&$form, FormStateInterface $form_state) {
    $this
      ->operatorValidate($form, $form_state);
    $this
      ->valueValidate($form, $form_state);
    if (!empty($this->options['exposed']) && !$this
      ->isAGroup()) {
      $this
        ->validateExposeForm($form, $form_state);
    }
    if ($this
      ->isAGroup()) {
      $this
        ->buildGroupValidate($form, $form_state);
    }
  }

  /**
   * Simple submit handler.
   */
  public function submitOptionsForm(&$form, FormStateInterface $form_state) {

    // Do not store these values.
    $form_state
      ->unsetValue('expose_button');
    $form_state
      ->unsetValue('group_button');
    if (!$this
      ->isAGroup()) {
      $this
        ->operatorSubmit($form, $form_state);
      $this
        ->valueSubmit($form, $form_state);
    }
    if (!empty($this->options['exposed'])) {
      $this
        ->submitExposeForm($form, $form_state);
    }
    if ($this
      ->isAGroup()) {
      $this
        ->buildGroupSubmit($form, $form_state);
    }
  }

  /**
   * Shortcut to display the operator form.
   */
  public function showOperatorForm(&$form, FormStateInterface $form_state) {
    $this
      ->operatorForm($form, $form_state);
    $form['operator']['#prefix'] = '<div class="views-group-box views-left-30">';
    $form['operator']['#suffix'] = '</div>';
  }

  /**
   * Options form subform for setting the operator.
   *
   * This may be overridden by child classes, and it must
   * define $form['operator'];
   *
   * @see buildOptionsForm()
   */
  protected function operatorForm(&$form, FormStateInterface $form_state) {
    $options = $this
      ->operatorOptions();
    if (!empty($options)) {
      $form['operator'] = [
        '#type' => count($options) < 10 ? 'radios' : 'select',
        '#title' => $this
          ->t('Operator'),
        '#default_value' => $this->operator,
        '#options' => $options,
      ];
    }
  }

  /**
   * Provide a list of options for the default operator form.
   *
   * Should be overridden by classes that don't override operatorForm.
   */
  public function operatorOptions() {
    return [];
  }

  /**
   * Validate the operator form.
   */
  protected function operatorValidate($form, FormStateInterface $form_state) {
  }

  /**
   * Perform any necessary changes to the form values prior to storage.
   *
   * There is no need for this function to actually store the data.
   */
  public function operatorSubmit($form, FormStateInterface $form_state) {
  }

  /**
   * Shortcut to display the value form.
   */
  protected function showValueForm(&$form, FormStateInterface $form_state) {
    $this
      ->valueForm($form, $form_state);
    if (empty($this->no_operator)) {
      $form['value']['#prefix'] = '<div class="views-group-box views-right-70">' . (isset($form['value']['#prefix']) ? $form['value']['#prefix'] : '');
      $form['value']['#suffix'] = (isset($form['value']['#suffix']) ? $form['value']['#suffix'] : '') . '</div>';
    }
  }

  /**
   * Options form subform for setting options.
   *
   * This should be overridden by all child classes and it must
   * define $form['value']
   *
   * @see buildOptionsForm()
   */
  protected function valueForm(&$form, FormStateInterface $form_state) {
    $form['value'] = [];
  }

  /**
   * Validate the options form.
   */
  protected function valueValidate($form, FormStateInterface $form_state) {
  }

  /**
   * Perform any necessary changes to the form values prior to storage.
   *
   * There is no need for this function to actually store the data.
   */
  protected function valueSubmit($form, FormStateInterface $form_state) {
  }

  /**
   * Shortcut to display the exposed options form.
   */
  public function showBuildGroupForm(&$form, FormStateInterface $form_state) {
    if (empty($this->options['is_grouped'])) {
      return;
    }
    $this
      ->buildExposedFiltersGroupForm($form, $form_state);

    // When we click the expose button, we add new gadgets to the form but they
    // have no data in POST so their defaults get wiped out. This prevents
    // these defaults from getting wiped out. This setting will only be TRUE
    // during a 2nd pass rerender.
    if ($form_state
      ->get('force_build_group_options')) {
      foreach (Element::children($form['group_info']) as $id) {
        if (isset($form['group_info'][$id]['#default_value']) && !isset($form['group_info'][$id]['#value'])) {
          $form['group_info'][$id]['#value'] = $form['group_info'][$id]['#default_value'];
        }
      }
    }
  }

  /**
   * Shortcut to display the build_group/hide button.
   */
  protected function showBuildGroupButton(&$form, FormStateInterface $form_state) {
    $form['group_button'] = [
      '#prefix' => '<div class="views-grouped clearfix">',
      '#suffix' => '</div>',
      // Should always come after the description and the relationship.
      '#weight' => -190,
    ];
    $grouped_description = $this
      ->t('Grouped filters allow a choice between predefined operator|value pairs.');
    $form['group_button']['radios'] = [
      '#theme_wrappers' => [
        'container',
      ],
      '#attributes' => [
        'class' => [
          'js-only',
        ],
      ],
    ];
    $form['group_button']['radios']['radios'] = [
      '#title' => $this
        ->t('Filter type to expose'),
      '#description' => $grouped_description,
      '#type' => 'radios',
      '#options' => [
        $this
          ->t('Single filter'),
        $this
          ->t('Grouped filters'),
      ],
    ];
    if (empty($this->options['is_grouped'])) {
      $form['group_button']['markup'] = [
        '#markup' => '<div class="description grouped-description">' . $grouped_description . '</div>',
      ];
      $form['group_button']['button'] = [
        '#limit_validation_errors' => [],
        '#type' => 'submit',
        '#value' => $this
          ->t('Grouped filters'),
        '#submit' => [
          [
            $this,
            'buildGroupForm',
          ],
        ],
      ];
      $form['group_button']['radios']['radios']['#default_value'] = 0;
    }
    else {
      $form['group_button']['button'] = [
        '#limit_validation_errors' => [],
        '#type' => 'submit',
        '#value' => $this
          ->t('Single filter'),
        '#submit' => [
          [
            $this,
            'buildGroupForm',
          ],
        ],
      ];
      $form['group_button']['radios']['radios']['#default_value'] = 1;
    }
  }

  /**
   * Displays the Build Group form.
   */
  public function buildGroupForm($form, FormStateInterface $form_state) {
    $item =& $this->options;

    // flip. If the filter was a group, set back to a standard filter.
    $item['is_grouped'] = empty($item['is_grouped']);

    // If necessary, set new defaults:
    if ($item['is_grouped']) {
      $this
        ->buildGroupOptions();
    }
    $view = $form_state
      ->get('view');
    $display_id = $form_state
      ->get('display_id');
    $type = $form_state
      ->get('type');
    $id = $form_state
      ->get('id');
    $view
      ->getExecutable()
      ->setHandler($display_id, $type, $id, $item);
    $view
      ->addFormToStack($form_state
      ->get('form_key'), $display_id, $type, $id, TRUE, TRUE);
    $view
      ->cacheSet();
    $form_state
      ->set('rerender', TRUE);
    $form_state
      ->setRebuild();
    $form_state
      ->get('force_build_group_options', TRUE);
  }

  /**
   * Shortcut to display the expose/hide button.
   */
  public function showExposeButton(&$form, FormStateInterface $form_state) {
    $form['expose_button'] = [
      '#prefix' => '<div class="views-expose clearfix">',
      '#suffix' => '</div>',
      // Should always come after the description and the relationship.
      '#weight' => -200,
    ];

    // Add a checkbox for JS users, which will have behavior attached to it
    // so it can replace the button.
    $form['expose_button']['checkbox'] = [
      '#theme_wrappers' => [
        'container',
      ],
      '#attributes' => [
        'class' => [
          'js-only',
        ],
      ],
    ];
    $form['expose_button']['checkbox']['checkbox'] = [
      '#title' => $this
        ->t('Expose this filter to visitors, to allow them to change it'),
      '#type' => 'checkbox',
    ];

    // Then add the button itself.
    if (empty($this->options['exposed'])) {
      $form['expose_button']['markup'] = [
        '#markup' => '<div class="description exposed-description">' . $this
          ->t('This filter is not exposed. Expose it to allow the users to change it.') . '</div>',
      ];
      $form['expose_button']['button'] = [
        '#limit_validation_errors' => [],
        '#type' => 'submit',
        '#value' => $this
          ->t('Expose filter'),
        '#submit' => [
          [
            $this,
            'displayExposedForm',
          ],
        ],
      ];
      $form['expose_button']['checkbox']['checkbox']['#default_value'] = 0;
    }
    else {
      $form['expose_button']['markup'] = [
        '#markup' => '<div class="description exposed-description">' . $this
          ->t('This filter is exposed. If you hide it, users will not be able to change it.') . '</div>',
      ];
      $form['expose_button']['button'] = [
        '#limit_validation_errors' => [],
        '#type' => 'submit',
        '#value' => $this
          ->t('Hide filter'),
        '#submit' => [
          [
            $this,
            'displayExposedForm',
          ],
        ],
      ];
      $form['expose_button']['checkbox']['checkbox']['#default_value'] = 1;
    }
  }

  /**
   * Options form subform for exposed filter options.
   *
   * @see buildOptionsForm()
   */
  public function buildExposeForm(&$form, FormStateInterface $form_state) {
    $form['#theme'] = 'views_ui_expose_filter_form';

    // #flatten will move everything from $form['expose'][$key] to $form[$key]
    // prior to rendering. That's why the preRender for it needs to run first,
    // so that when the next preRender (the one for fieldsets) runs, it gets
    // the flattened data.
    array_unshift($form['#pre_render'], [
      static::class,
      'preRenderFlattenData',
    ]);
    $form['expose']['#flatten'] = TRUE;
    if (empty($this->always_required)) {
      $form['expose']['required'] = [
        '#type' => 'checkbox',
        '#title' => $this
          ->t('Required'),
        '#default_value' => $this->options['expose']['required'],
      ];
    }
    else {
      $form['expose']['required'] = [
        '#type' => 'value',
        '#value' => TRUE,
      ];
    }
    $form['expose']['label'] = [
      '#type' => 'textfield',
      '#default_value' => $this->options['expose']['label'],
      '#title' => $this
        ->t('Label'),
      '#size' => 40,
    ];
    $form['expose']['description'] = [
      '#type' => 'textfield',
      '#default_value' => $this->options['expose']['description'],
      '#title' => $this
        ->t('Description'),
      '#size' => 60,
    ];
    if (!empty($form['operator']['#type'])) {

      // Increase the width of the left (operator) column.
      $form['operator']['#prefix'] = '<div class="views-group-box views-left-40">';
      $form['operator']['#suffix'] = '</div>';
      $form['value']['#prefix'] = '<div class="views-group-box views-right-60">';
      $form['value']['#suffix'] = '</div>';
      $form['expose']['use_operator'] = [
        '#type' => 'checkbox',
        '#title' => $this
          ->t('Expose operator'),
        '#description' => $this
          ->t('Allow the user to choose the operator.'),
        '#default_value' => !empty($this->options['expose']['use_operator']),
      ];
      $operators = $this
        ->operatorOptions();
      if (!empty($operators) && count($operators) > 1) {
        $form['expose']['operator_limit_selection'] = [
          '#type' => 'checkbox',
          '#title' => $this
            ->t('Limit the available operators'),
          '#description' => $this
            ->t('Limit the available operators to be shown on the exposed filter.'),
          '#default_value' => !empty($this->options['expose']['operator_limit_selection']),
          '#states' => [
            'visible' => [
              ':input[name="options[expose][use_operator]"]' => [
                'checked' => TRUE,
              ],
            ],
          ],
        ];
        $form['expose']['operator_list'] = [
          '#type' => 'select',
          '#title' => $this
            ->t('Restrict operators to'),
          '#default_value' => $this->options['expose']['operator_list'],
          '#options' => $operators,
          '#multiple' => TRUE,
          '#description' => $this
            ->t('Selecting none will make all of them available.'),
          '#states' => [
            'visible' => [
              ':input[name="options[expose][operator_limit_selection]"]' => [
                'checked' => TRUE,
              ],
              ':input[name="options[expose][use_operator]"]' => [
                'checked' => TRUE,
              ],
            ],
          ],
        ];
      }
      $form['expose']['operator_id'] = [
        '#type' => 'textfield',
        '#default_value' => $this->options['expose']['operator_id'],
        '#title' => $this
          ->t('Operator identifier'),
        '#size' => 40,
        '#description' => $this
          ->t('This will appear in the URL after the ? to identify this operator.'),
        '#states' => [
          'visible' => [
            ':input[name="options[expose][use_operator]"]' => [
              'checked' => TRUE,
            ],
          ],
        ],
      ];
    }
    else {
      $form['expose']['operator_id'] = [
        '#type' => 'value',
        '#value' => '',
      ];
    }
    if (empty($this->alwaysMultiple)) {
      $form['expose']['multiple'] = [
        '#type' => 'checkbox',
        '#title' => $this
          ->t('Allow multiple selections'),
        '#description' => $this
          ->t('Enable to allow users to select multiple items.'),
        '#default_value' => $this->options['expose']['multiple'],
      ];
    }
    $form['expose']['remember'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Remember the last selection'),
      '#description' => $this
        ->t('Enable to remember the last selection made by the user.'),
      '#default_value' => $this->options['expose']['remember'],
    ];
    $role_options = array_map('\\Drupal\\Component\\Utility\\Html::escape', user_role_names());
    $form['expose']['remember_roles'] = [
      '#type' => 'checkboxes',
      '#title' => $this
        ->t('User roles'),
      '#description' => $this
        ->t('Remember exposed selection only for the selected user role(s). If you select no roles, the exposed data will never be stored.'),
      '#default_value' => $this->options['expose']['remember_roles'],
      '#options' => $role_options,
      '#states' => [
        'invisible' => [
          ':input[name="options[expose][remember]"]' => [
            'checked' => FALSE,
          ],
        ],
      ],
    ];
    $form['expose']['identifier'] = [
      '#type' => 'textfield',
      '#default_value' => $this->options['expose']['identifier'],
      '#title' => $this
        ->t('Filter identifier'),
      '#size' => 40,
      '#description' => $this
        ->t('This will appear in the URL after the ? to identify this filter. Cannot be blank. Only letters, digits and the dot ("."), hyphen ("-"), underscore ("_"), and tilde ("~") characters are allowed.'),
    ];
  }

  /**
   * {@inheritdoc}
   */
  public static function trustedCallbacks() {
    $callbacks = parent::trustedCallbacks();
    $callbacks[] = 'preRenderFlattenData';
    return $callbacks;
  }

  /**
   * Validate the options form.
   */
  public function validateExposeForm($form, FormStateInterface $form_state) {
    $identifier = $form_state
      ->getValue([
      'options',
      'expose',
      'identifier',
    ]);
    $this
      ->validateIdentifier($identifier, $form_state, $form['expose']['identifier']);
    $limit_operators = $form_state
      ->getValue([
      'options',
      'expose',
      'operator_limit_selection',
    ]);
    $operators_selected = $form_state
      ->getValue([
      'options',
      'expose',
      'operator_list',
    ]);
    $selected_operator = $form_state
      ->getValue([
      'options',
      'operator',
    ]);
    if ($limit_operators && !in_array($selected_operator, $operators_selected, TRUE)) {
      $form_state
        ->setError($form['expose']['operator_list'], $this
        ->t('You selected the "@operator" operator as the default value but is not included in the list of limited operators.', [
        '@operator' => $this
          ->operatorOptions()[$selected_operator],
      ]));
    }
  }

  /**
   * Determines if the given grouped filter entry has a valid value.
   *
   * @param array $group
   *   A group entry as defined by buildGroupForm().
   *
   * @return bool
   */
  protected function hasValidGroupedValue(array $group) {
    $operators = $this
      ->operators();
    if ($operators[$group['operator']]['values'] == 0) {

      // Some filters, such as "is empty," do not require a value to be
      // specified in order to be valid entries.
      return TRUE;
    }
    else {
      if (is_string($group['value'])) {
        return trim($group['value']) != '';
      }
      elseif (is_array($group['value'])) {

        // Some filters allow multiple options to be selected (for example, node
        // types). Ensure at least the minimum number of values is present for
        // this entry to be considered valid.
        $min_values = $operators[$group['operator']]['values'];
        $actual_values = count(array_filter($group['value'], 'static::arrayFilterZero'));
        return $actual_values >= $min_values;
      }
    }
    return FALSE;
  }

  /**
   * Validate the build group options form.
   */
  protected function buildGroupValidate($form, FormStateInterface $form_state) {
    if (!$form_state
      ->isValueEmpty([
      'options',
      'group_info',
    ])) {
      $identifier = $form_state
        ->getValue([
        'options',
        'group_info',
        'identifier',
      ]);
      $this
        ->validateIdentifier($identifier, $form_state, $form['group_info']['identifier']);
    }
    if ($group_items = $form_state
      ->getValue([
      'options',
      'group_info',
      'group_items',
    ])) {
      foreach ($group_items as $id => $group) {
        if (empty($group['remove'])) {
          $has_valid_value = $this
            ->hasValidGroupedValue($group);
          if ($has_valid_value && $group['title'] == '') {
            $operators = $this
              ->operators();
            if ($operators[$group['operator']]['values'] == 0) {
              $form_state
                ->setError($form['group_info']['group_items'][$id]['title'], $this
                ->t('A label is required for the specified operator.'));
            }
            else {
              $form_state
                ->setError($form['group_info']['group_items'][$id]['title'], $this
                ->t('A label is required if the value for this item is defined.'));
            }
          }
          if (!$has_valid_value && $group['title'] != '') {
            $form_state
              ->setError($form['group_info']['group_items'][$id]['value'], $this
              ->t('A value is required if the label for this item is defined.'));
          }
        }
      }
    }
  }

  /**
   * Validates a filter identifier.
   *
   * Sets the form error if $form_state is passed or an error string if
   * $form_state is not passed.
   *
   * @param string $identifier
   *   The identifier to check.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   * @param array $form_group
   *   The form element to set any errors on.
   *
   * @return string
   */
  protected function validateIdentifier($identifier, FormStateInterface $form_state = NULL, &$form_group = []) {
    $error = '';
    if (empty($identifier)) {
      $error = $this
        ->t('The identifier is required if the filter is exposed.');
    }
    elseif ($identifier == 'value') {
      $error = $this
        ->t('This identifier is not allowed.');
    }
    elseif (preg_match('/[^a-zA-Z0-9_~\\.\\-]+/', $identifier)) {
      $error = $this
        ->t('This identifier has illegal characters.');
    }
    if ($form_state && !$this->view->display_handler
      ->isIdentifierUnique($form_state
      ->get('id'), $identifier)) {
      $error = $this
        ->t('This identifier is used by another handler.');
    }
    if (!empty($form_state) && !empty($error)) {
      $form_state
        ->setError($form_group, $error);
    }
    return $error;
  }

  /**
   * Save new group items, re-enumerates and remove groups marked to delete.
   */
  protected function buildGroupSubmit($form, FormStateInterface $form_state) {
    $groups = [];
    $group_items = $form_state
      ->getValue([
      'options',
      'group_info',
      'group_items',
    ]);
    uasort($group_items, [
      'Drupal\\Component\\Utility\\SortArray',
      'sortByWeightElement',
    ]);

    // Filter out removed items.
    // Start from 1 to avoid problems with #default_value in the widget.
    $new_id = 1;
    $new_default = 'All';
    foreach ($group_items as $id => $group) {
      if (empty($group['remove'])) {

        // Don't store this.
        unset($group['remove']);
        unset($group['weight']);
        $groups[$new_id] = $group;
        if ($form_state
          ->getValue([
          'options',
          'group_info',
          'default_group',
        ]) == $id) {
          $new_default = $new_id;
        }
      }
      $new_id++;
    }
    if ($new_default != 'All') {
      $form_state
        ->setValue([
        'options',
        'group_info',
        'default_group',
      ], $new_default);
    }
    $filter_default_multiple = $form_state
      ->getValue([
      'options',
      'group_info',
      'default_group_multiple',
    ]);
    $form_state
      ->setValue([
      'options',
      'group_info',
      'default_group_multiple',
    ], array_filter($filter_default_multiple));
    $form_state
      ->setValue([
      'options',
      'group_info',
      'group_items',
    ], $groups);
  }

  /**
   * Provide default options for exposed filters.
   */
  public function defaultExposeOptions() {
    $this->options['expose'] = [
      'use_operator' => FALSE,
      'operator' => $this->options['id'] . '_op',
      'operator_limit_selection' => FALSE,
      'operator_list' => [],
      'identifier' => $this->options['id'],
      'label' => $this->definition['title'],
      'description' => NULL,
      'remember' => FALSE,
      'multiple' => FALSE,
      'required' => FALSE,
    ];
  }

  /**
   * Provide default options for exposed filters.
   */
  protected function buildGroupOptions() {
    $this->options['group_info'] = [
      'label' => $this->definition['title'],
      'description' => NULL,
      'identifier' => $this->options['id'],
      'optional' => TRUE,
      'widget' => 'select',
      'multiple' => FALSE,
      'remember' => FALSE,
      'default_group' => 'All',
      'default_group_multiple' => [],
      'group_items' => [],
    ];
  }

  /**
   * Build a form containing a group of operator | values to apply as a
   * single filter.
   */
  public function groupForm(&$form, FormStateInterface $form_state) {
    if (!empty($this->options['group_info']['optional']) && !$this
      ->multipleExposedInput()) {
      $groups = [
        'All' => $this
          ->t('- Any -'),
      ];
    }
    foreach ($this->options['group_info']['group_items'] as $id => $group) {
      if (!empty($group['title'])) {
        $groups[$id] = $id != 'All' ? $this
          ->t($group['title']) : $group['title'];
      }
    }
    if (count($groups)) {
      $value = $this->options['group_info']['identifier'];
      $form[$value] = [
        '#title' => $this->options['group_info']['label'],
        '#type' => $this->options['group_info']['widget'],
        '#default_value' => $this->group_info,
        '#options' => $groups,
      ];
      if (!empty($this->options['group_info']['multiple'])) {
        if (count($groups) < 5) {
          $form[$value]['#type'] = 'checkboxes';
        }
        else {
          $form[$value]['#type'] = 'select';
          $form[$value]['#size'] = 5;
          $form[$value]['#multiple'] = TRUE;
        }
        unset($form[$value]['#default_value']);
        $user_input = $form_state
          ->getUserInput();
        if (empty($user_input)) {
          $user_input[$value] = $this->group_info;
          $form_state
            ->setUserInput($user_input);
        }
      }
      $this->options['expose']['label'] = '';
    }
  }

  /**
   * Render our chunk of the exposed filter form when selecting.
   *
   * You can override this if it doesn't do what you expect.
   */
  public function buildExposedForm(&$form, FormStateInterface $form_state) {
    if (empty($this->options['exposed'])) {
      return;
    }

    // Build the exposed form, when its based on an operator.
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id'])) {
      $operator = $this->options['expose']['operator_id'];
      $this
        ->operatorForm($form, $form_state);

      // Limit the exposed operators if needed.
      if (!empty($this->options['expose']['operator_limit_selection']) && !empty($this->options['expose']['operator_list'])) {
        $options = $this
          ->operatorOptions();
        $operator_list = $this->options['expose']['operator_list'];
        $form['operator']['#options'] = array_intersect_key($options, $operator_list);
      }
      $form[$operator] = $form['operator'];
      $this
        ->exposedTranslate($form[$operator], 'operator');
      unset($form['operator']);

      // When the operator and value forms are both in play, enclose them within
      // a wrapper.
      if (!empty($this->options['expose']['identifier'])) {
        $wrapper = $this->options['expose']['identifier'] . '_wrapper';
        $this
          ->buildValueWrapper($form, $wrapper);
        $form[$operator]['#title_display'] = 'invisible';
        $form[$wrapper][$operator] = $form[$operator];
        unset($form[$operator]);
      }
    }

    // Build the form and set the value based on the identifier.
    if (!empty($this->options['expose']['identifier'])) {
      $value = $this->options['expose']['identifier'];
      $this
        ->valueForm($form, $form_state);
      $form[$value] = $form['value'];
      if (isset($form[$value]['#title']) && !empty($form[$value]['#type']) && $form[$value]['#type'] != 'checkbox') {
        unset($form[$value]['#title']);
      }
      $this
        ->exposedTranslate($form[$value], 'value');
      if ($value != 'value') {
        unset($form['value']);
      }

      // When the operator and value forms are both in play, enclose them within
      // a wrapper, for usability. Also wrap if the value form is comprised of
      // multiple elements.
      if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id']) || count(Element::children($form[$value]))) {
        $wrapper = $value . '_wrapper';
        $this
          ->buildValueWrapper($form, $wrapper);
        $form[$wrapper][$value] = $form[$value];
        unset($form[$value]);
      }
    }
  }

  /**
   * Builds wrapper for value and operator forms.
   *
   * @param array $form
   *   The form.
   * @param string $wrapper_identifier
   *   The key to use for the wrapper element.
   */
  protected function buildValueWrapper(&$form, $wrapper_identifier) {

    // If both the field and the operator are exposed, this will end up being
    // called twice. We don't want to wipe out what's already there, so if it
    // exists already, do nothing.
    if (!isset($form[$wrapper_identifier])) {
      $form[$wrapper_identifier] = [
        '#type' => 'fieldset',
      ];
      $exposed_info = $this
        ->exposedInfo();
      if (!empty($exposed_info['label'])) {
        $form[$wrapper_identifier]['#title'] = $exposed_info['label'];
      }
      if (!empty($exposed_info['description'])) {
        $form[$wrapper_identifier]['#description'] = $exposed_info['description'];
      }
    }
  }

  /**
   * Build the form to let users create the group of exposed filters.
   *
   * This form is displayed when users click on button 'Build group'.
   */
  protected function buildExposedFiltersGroupForm(&$form, FormStateInterface $form_state) {
    if (empty($this->options['exposed']) || empty($this->options['is_grouped'])) {
      return;
    }
    $form['#theme'] = 'views_ui_build_group_filter_form';

    // #flatten will move everything from $form['group_info'][$key] to $form[$key]
    // prior to rendering. That's why the preRender for it needs to run first,
    // so that when the next preRender (the one for fieldsets) runs, it gets
    // the flattened data.
    array_unshift($form['#pre_render'], [
      static::class,
      'preRenderFlattenData',
    ]);
    $form['group_info']['#flatten'] = TRUE;
    if (!empty($this->options['group_info']['identifier'])) {
      $identifier = $this->options['group_info']['identifier'];
    }
    else {
      $identifier = 'group_' . $this->options['expose']['identifier'];
    }
    $form['group_info']['identifier'] = [
      '#type' => 'textfield',
      '#default_value' => $identifier,
      '#title' => $this
        ->t('Filter identifier'),
      '#size' => 40,
      '#description' => $this
        ->t('This will appear in the URL after the ? to identify this filter. Cannot be blank. Only letters, digits and the dot ("."), hyphen ("-"), underscore ("_"), and tilde ("~") characters are allowed.'),
    ];
    $form['group_info']['label'] = [
      '#type' => 'textfield',
      '#default_value' => $this->options['group_info']['label'],
      '#title' => $this
        ->t('Label'),
      '#size' => 40,
    ];
    $form['group_info']['description'] = [
      '#type' => 'textfield',
      '#default_value' => $this->options['group_info']['description'],
      '#title' => $this
        ->t('Description'),
      '#size' => 60,
    ];
    $form['group_info']['optional'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Optional'),
      '#description' => $this
        ->t('This exposed filter is optional and will have added options to allow it not to be set.'),
      '#default_value' => $this->options['group_info']['optional'],
    ];
    $form['group_info']['multiple'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Allow multiple selections'),
      '#description' => $this
        ->t('Enable to allow users to select multiple items.'),
      '#default_value' => $this->options['group_info']['multiple'],
    ];
    $form['group_info']['widget'] = [
      '#type' => 'radios',
      '#default_value' => $this->options['group_info']['widget'],
      '#title' => $this
        ->t('Widget type'),
      '#options' => [
        'radios' => $this
          ->t('Radios'),
        'select' => $this
          ->t('Select'),
      ],
      '#description' => $this
        ->t('Select which kind of widget will be used to render the group of filters'),
    ];
    $form['group_info']['remember'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Remember'),
      '#description' => $this
        ->t('Remember the last setting the user gave this filter.'),
      '#default_value' => $this->options['group_info']['remember'],
    ];
    if (!empty($this->options['group_info']['identifier'])) {
      $identifier = $this->options['group_info']['identifier'];
    }
    else {
      $identifier = 'group_' . $this->options['expose']['identifier'];
    }
    $form['group_info']['identifier'] = [
      '#type' => 'textfield',
      '#default_value' => $identifier,
      '#title' => $this
        ->t('Filter identifier'),
      '#size' => 40,
      '#description' => $this
        ->t('This will appear in the URL after the ? to identify this filter. Cannot be blank. Only letters, digits and the dot ("."), hyphen ("-"), underscore ("_"), and tilde ("~") characters are allowed.'),
    ];
    $form['group_info']['label'] = [
      '#type' => 'textfield',
      '#default_value' => $this->options['group_info']['label'],
      '#title' => $this
        ->t('Label'),
      '#size' => 40,
    ];
    $form['group_info']['optional'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Optional'),
      '#description' => $this
        ->t('This exposed filter is optional and will have added options to allow it not to be set.'),
      '#default_value' => $this->options['group_info']['optional'],
    ];
    $form['group_info']['widget'] = [
      '#type' => 'radios',
      '#default_value' => $this->options['group_info']['widget'],
      '#title' => $this
        ->t('Widget type'),
      '#options' => [
        'radios' => $this
          ->t('Radios'),
        'select' => $this
          ->t('Select'),
      ],
      '#description' => $this
        ->t('Select which kind of widget will be used to render the group of filters'),
    ];
    $form['group_info']['remember'] = [
      '#type' => 'checkbox',
      '#title' => $this
        ->t('Remember'),
      '#description' => $this
        ->t('Remember the last setting the user gave this filter.'),
      '#default_value' => $this->options['group_info']['remember'],
    ];

    // The string '- Any -' will not be rendered.
    // @see theme_views_ui_build_group_filter_form()
    $groups = [
      'All' => $this
        ->t('- Any -'),
    ];

    // Provide 3 options to start when we are in a new group.
    if (count($this->options['group_info']['group_items']) == 0) {
      $this->options['group_info']['group_items'] = array_fill(1, 3, []);
    }

    // After the general settings, comes a table with all the existent groups.
    $default_weight = 0;
    foreach ($this->options['group_info']['group_items'] as $item_id => $item) {
      if (!$form_state
        ->isValueEmpty([
        'options',
        'group_info',
        'group_items',
        $item_id,
        'remove',
      ])) {
        continue;
      }

      // Each rows contains three widgets:
      // a) The title, where users define how they identify a pair of operator | value
      // b) The operator
      // c) The value (or values) to use in the filter with the selected operator
      // In each row, we have to display the operator form and the value from
      // $row acts as a fake form to render each widget in a row.
      $row = [];
      $groups[$item_id] = $this
        ->t('Grouping @id', [
        '@id' => $item_id,
      ]);
      $this
        ->operatorForm($row, $form_state);

      // Force the operator form to be a select box. Some handlers uses
      // radios and they occupy a lot of space in a table row.
      $row['operator']['#type'] = 'select';
      $row['operator']['#title'] = '';
      $this
        ->valueForm($row, $form_state);

      // Fix the dependencies to update value forms when operators changes. This
      // is needed because forms are inside a new form and their IDs changes.
      // Dependencies are used when operator changes from to 'Between',
      // 'Not Between', etc, and two or more widgets are displayed.
      FormHelper::rewriteStatesSelector($row['value'], ':input[name="options[operator]"]', ':input[name="options[group_info][group_items][' . $item_id . '][operator]"]');

      // Set default values.
      $children = Element::children($row['value']);
      if (!empty($children)) {
        foreach ($children as $child) {
          if (!empty($row['value'][$child]['#states']['visible'])) {
            foreach ($row['value'][$child]['#states']['visible'] as $state) {
              if (isset($state[':input[name="options[group_info][group_items][' . $item_id . '][operator]"]'])) {
                $row['value'][$child]['#title'] = '';

                // Exit this loop and process the next child element.
                break;
              }
            }
          }
          if (!empty($this->options['group_info']['group_items'][$item_id]['value'][$child])) {
            $row['value'][$child]['#default_value'] = $this->options['group_info']['group_items'][$item_id]['value'][$child];
          }
        }
      }
      else {
        if (isset($this->options['group_info']['group_items'][$item_id]['value']) && $this->options['group_info']['group_items'][$item_id]['value'] != '') {
          $row['value']['#default_value'] = $this->options['group_info']['group_items'][$item_id]['value'];
        }
      }
      if (!empty($this->options['group_info']['group_items'][$item_id]['operator'])) {
        $row['operator']['#default_value'] = $this->options['group_info']['group_items'][$item_id]['operator'];
      }
      $default_title = '';
      if (!empty($this->options['group_info']['group_items'][$item_id]['title'])) {
        $default_title = $this->options['group_info']['group_items'][$item_id]['title'];
      }

      // Per item group, we have a title that identifies it.
      $form['group_info']['group_items'][$item_id] = [
        'title' => [
          '#title' => $this
            ->t('Label'),
          '#title_display' => 'invisible',
          '#type' => 'textfield',
          '#size' => 20,
          '#default_value' => $default_title,
        ],
        'operator' => $row['operator'],
        'value' => $row['value'],
        // No title is given here, since this input is never displayed. It is
        // only triggered by JavaScript.
        'remove' => [
          '#type' => 'checkbox',
          '#id' => 'views-removed-' . $item_id,
          '#attributes' => [
            'class' => [
              'views-remove-checkbox',
            ],
          ],
          '#default_value' => 0,
        ],
        'weight' => [
          '#title' => $this
            ->t('Weight'),
          '#title_display' => 'invisible',
          '#type' => 'weight',
          '#delta' => count($this->options['group_info']['group_items']),
          '#default_value' => $default_weight++,
          '#attributes' => [
            'class' => [
              'weight',
            ],
          ],
        ],
      ];
    }

    // From all groups, let chose which is the default.
    $form['group_info']['default_group'] = [
      '#type' => 'radios',
      '#options' => $groups,
      '#default_value' => $this->options['group_info']['default_group'],
      '#required' => TRUE,
      '#attributes' => [
        'class' => [
          'default-radios',
        ],
      ],
    ];

    // From all groups, let chose which is the default.
    $form['group_info']['default_group_multiple'] = [
      '#type' => 'checkboxes',
      '#options' => $groups,
      '#default_value' => $this->options['group_info']['default_group_multiple'],
      '#attributes' => [
        'class' => [
          'default-checkboxes',
        ],
      ],
    ];
    $form['group_info']['add_group'] = [
      '#prefix' => '<div class="views-build-group clear-block">',
      '#suffix' => '</div>',
      '#type' => 'submit',
      '#value' => $this
        ->t('Add another item'),
      '#submit' => [
        [
          $this,
          'addGroupForm',
        ],
      ],
    ];
    $js = [];
    $js['tableDrag']['views-filter-groups']['weight'][0] = [
      'target' => 'weight',
      'source' => NULL,
      'relationship' => 'sibling',
      'action' => 'order',
      'hidden' => TRUE,
      'limit' => 0,
    ];
    $js_settings = $form_state
      ->get('js_settings');
    if ($js_settings && is_array($js)) {
      $js_settings = array_merge($js_settings, $js);
    }
    else {
      $js_settings = $js;
    }
    $form_state
      ->set('js_settings', $js_settings);
  }

  /**
   * Add a new group to the exposed filter groups.
   */
  public function addGroupForm($form, FormStateInterface $form_state) {
    $item =& $this->options;

    // Add a new row.
    $item['group_info']['group_items'][] = [];
    $view = $form_state
      ->get('view');
    $display_id = $form_state
      ->get('display_id');
    $type = $form_state
      ->get('type');
    $id = $form_state
      ->get('id');
    $view
      ->getExecutable()
      ->setHandler($display_id, $type, $id, $item);
    $view
      ->cacheSet();
    $form_state
      ->set('rerender', TRUE);
    $form_state
      ->setRebuild();
    $form_state
      ->get('force_build_group_options', TRUE);
  }

  /**
   * Make some translations to a form item to make it more suitable to
   * exposing.
   */
  protected function exposedTranslate(&$form, $type) {
    if (!isset($form['#type'])) {
      return;
    }
    if ($form['#type'] == 'radios') {
      $form['#type'] = 'select';
    }

    // Checkboxes don't work so well in exposed forms due to GET conversions.
    if ($form['#type'] == 'checkboxes') {
      if (empty($form['#no_convert']) || empty($this->options['expose']['multiple'])) {
        $form['#type'] = 'select';
      }
      if (!empty($this->options['expose']['multiple'])) {
        $form['#multiple'] = TRUE;
      }
    }
    if (empty($this->options['expose']['multiple']) && isset($form['#multiple'])) {
      unset($form['#multiple']);
      $form['#size'] = NULL;
    }

    // Cleanup in case the translated element's (radios or checkboxes) display value contains html.
    if ($form['#type'] == 'select') {
      $this
        ->prepareFilterSelectOptions($form['#options']);
    }
    if ($type == 'value' && empty($this->always_required) && empty($this->options['expose']['required']) && $form['#type'] == 'select' && empty($form['#multiple'])) {
      $form['#options'] = [
        'All' => $this
          ->t('- Any -'),
      ] + $form['#options'];
      $form['#default_value'] = 'All';
    }
    if (!empty($this->options['expose']['required'])) {
      $form['#required'] = TRUE;
    }
  }

  /**
   * Sanitizes the HTML select element's options.
   *
   * The function is recursive to support optgroups.
   */
  protected function prepareFilterSelectOptions(&$options) {
    foreach ($options as $value => $label) {

      // Recurse for optgroups.
      if (is_array($label)) {
        $this
          ->prepareFilterSelectOptions($options[$value]);
      }
      elseif (is_object($label) && isset($label->option)) {
        $this
          ->prepareFilterSelectOptions($options[$value]->option);
      }
      else {

        // Cast the label to a string since it can be an object.
        // @see \Drupal\Core\StringTranslation\TranslatableMarkup
        $options[$value] = strip_tags(Html::decodeEntities((string) $label));
      }
    }
  }

  /**
   * Tell the renderer about our exposed form. This only needs to be
   * overridden for particularly complex forms. And maybe not even then.
   *
   * @return array|null
   *   For standard exposed filters. An array with the following keys:
   *   - operator: The $form key of the operator. Set to NULL if no operator.
   *   - value: The $form key of the value. Set to NULL if no value.
   *   - label: The label to use for this piece.
   *   For grouped exposed filters. An array with the following keys:
   *   - value: The $form key of the value. Set to NULL if no value.
   *   - label: The label to use for this piece.
   */
  public function exposedInfo() {
    if (empty($this->options['exposed'])) {
      return;
    }
    if ($this
      ->isAGroup()) {
      return [
        'value' => $this->options['group_info']['identifier'],
        'label' => $this->options['group_info']['label'],
        'description' => $this->options['group_info']['description'],
      ];
    }
    return [
      'operator' => $this->options['expose']['operator_id'],
      'value' => $this->options['expose']['identifier'],
      'label' => $this->options['expose']['label'],
      'description' => $this->options['expose']['description'],
    ];
  }

  /**
   * Transform the input from a grouped filter into a standard filter.
   *
   * When a filter is a group, find the set of operator and values
   * that the chosen item represents, and inform views that a normal
   * filter was submitted by telling the operator and the value selected.
   *
   * The param $selected_group_id is only passed when the filter uses the
   * checkboxes widget, and this function will be called for each item
   * chosen in the checkboxes.
   */
  public function convertExposedInput(&$input, $selected_group_id = NULL) {
    if ($this
      ->isAGroup()) {

      // If it is already defined the selected group, use it. Only valid
      // when the filter uses checkboxes for widget.
      if (!empty($selected_group_id)) {
        $selected_group = $selected_group_id;
      }
      else {
        $selected_group = $input[$this->options['group_info']['identifier']];
      }
      if ($selected_group == 'All' && !empty($this->options['group_info']['optional'])) {
        return NULL;
      }
      if ($selected_group != 'All' && empty($this->options['group_info']['group_items'][$selected_group])) {
        return FALSE;
      }
      if (isset($selected_group) && isset($this->options['group_info']['group_items'][$selected_group])) {
        $input[$this->options['expose']['operator']] = $this->options['group_info']['group_items'][$selected_group]['operator'];

        // Value can be optional, For example for 'empty' and 'not empty' filters.
        if (isset($this->options['group_info']['group_items'][$selected_group]['value']) && $this->options['group_info']['group_items'][$selected_group]['value'] !== '') {
          $input[$this->options['group_info']['identifier']] = $this->options['group_info']['group_items'][$selected_group]['value'];
        }
        $this->options['expose']['use_operator'] = TRUE;
        $this->group_info = $input[$this->options['group_info']['identifier']];
        return TRUE;
      }
      else {
        return FALSE;
      }
    }
  }

  /**
   * Returns the options available for a grouped filter that users checkboxes
   * as widget, and therefore has to be applied several times, one per
   * item selected.
   */
  public function groupMultipleExposedInput(&$input) {
    if (!empty($input[$this->options['group_info']['identifier']])) {
      return array_filter($input[$this->options['group_info']['identifier']]);
    }
    return [];
  }

  /**
   * Returns TRUE if users can select multiple groups items of a
   * grouped exposed filter.
   */
  public function multipleExposedInput() {
    return $this
      ->isAGroup() && !empty($this->options['group_info']['multiple']);
  }

  /**
   * If set to remember exposed input in the session, store it there.
   * This function is similar to storeExposedInput but modified to
   * work properly when the filter is a group.
   */
  public function storeGroupInput($input, $status) {
    if (!$this
      ->isAGroup() || empty($this->options['group_info']['identifier'])) {
      return TRUE;
    }
    if (empty($this->options['group_info']['remember'])) {
      return;
    }

    // Figure out which display id is responsible for the filters, so we
    // know where to look for session stored values.
    $display_id = $this->view->display_handler
      ->isDefaulted('filters') ? 'default' : $this->view->current_display;

    // False means that we got a setting that means to recurse ourselves,
    // so we should erase whatever happened to be there.
    $session = $this->view
      ->getRequest()
      ->getSession();
    $views_session = $session
      ->get('views', []);
    if ($status === FALSE && isset($views_session[$this->view->storage
      ->id()][$display_id])) {
      unset($views_session[$this->view->storage
        ->id()][$display_id][$this->options['group_info']['identifier']]);
    }
    if ($status !== FALSE) {
      if (!isset($views_session[$this->view->storage
        ->id()][$display_id])) {
        $views_session[$this->view->storage
          ->id()][$display_id] = [];
      }
      $views_session[$this->view->storage
        ->id()][$display_id][$this->options['group_info']['identifier']] = $input[$this->options['group_info']['identifier']];
    }
    if (!empty($views_session)) {
      $session
        ->set('views', $views_session);
    }
  }

  /**
   * Determines if the input from a filter should change the generated query.
   *
   * @param array $input
   *   The exposed data for this view.
   *
   * @return bool
   *   TRUE if the input for this filter should be included in the view query.
   *   FALSE otherwise.
   */
  public function acceptExposedInput($input) {
    if (empty($this->options['exposed'])) {
      return TRUE;
    }
    if (!empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id']) && isset($input[$this->options['expose']['operator_id']])) {
      $this->operator = $input[$this->options['expose']['operator_id']];
    }
    if (!empty($this->options['expose']['identifier'])) {
      if ($this->options['is_grouped']) {
        $value = $input[$this->options['group_info']['identifier']];
      }
      else {
        $value = $input[$this->options['expose']['identifier']];
      }

      // Various ways to check for the absence of non-required input.
      if (empty($this->options['expose']['required'])) {
        if (($this->operator == 'empty' || $this->operator == 'not empty') && $value === '') {
          $value = ' ';
        }
        if ($this->operator != 'empty' && $this->operator != 'not empty') {
          if ($value == 'All' || $value === []) {
            return FALSE;
          }

          // If checkboxes are used to render this filter, do not include the
          // filter if no options are checked.
          if (is_array($value) && Checkboxes::detectEmptyCheckboxes($value)) {
            return FALSE;
          }
        }
        if (!empty($this->alwaysMultiple) && $value === '') {
          return FALSE;
        }
      }
      if (isset($value)) {
        $this->value = $value;
        if (empty($this->alwaysMultiple) && empty($this->options['expose']['multiple']) && !is_array($value)) {
          $this->value = [
            $value,
          ];
        }
      }
      else {
        return FALSE;
      }
    }
    return TRUE;
  }
  public function storeExposedInput($input, $status) {
    if (empty($this->options['exposed']) || empty($this->options['expose']['identifier'])) {
      return TRUE;
    }
    if (empty($this->options['expose']['remember'])) {
      return;
    }

    // Check if we store exposed value for current user.
    $user = \Drupal::currentUser();
    $allowed_rids = empty($this->options['expose']['remember_roles']) ? [] : array_filter($this->options['expose']['remember_roles']);
    $intersect_rids = array_intersect(array_keys($allowed_rids), $user
      ->getRoles());
    if (empty($intersect_rids)) {
      return;
    }

    // Figure out which display id is responsible for the filters, so we
    // know where to look for session stored values.
    $display_id = $this->view->display_handler
      ->isDefaulted('filters') ? 'default' : $this->view->current_display;

    // shortcut test.
    $operator = !empty($this->options['expose']['use_operator']) && !empty($this->options['expose']['operator_id']);

    // False means that we got a setting that means to recurse ourselves,
    // so we should erase whatever happened to be there.
    $session = $this->view
      ->getRequest()
      ->getSession();
    $views_session = $session
      ->get('views', []);
    if (!$status && isset($views_session[$this->view->storage
      ->id()][$display_id])) {
      $session_ref =& $views_session[$this->view->storage
        ->id()][$display_id];
      if ($operator && isset($session_ref[$this->options['expose']['operator_id']])) {
        unset($session_ref[$this->options['expose']['operator_id']]);
      }
      if (isset($session_ref[$this->options['expose']['identifier']])) {
        unset($session_ref[$this->options['expose']['identifier']]);
      }
    }
    if ($status) {
      if (!isset($views_session[$this->view->storage
        ->id()][$display_id])) {
        $views_session[$this->view->storage
          ->id()][$display_id] = [];
      }
      $session_ref =& $views_session[$this->view->storage
        ->id()][$display_id];
      if ($operator && isset($input[$this->options['expose']['operator_id']])) {
        $session_ref[$this->options['expose']['operator_id']] = $input[$this->options['expose']['operator_id']];
      }
      $session_ref[$this->options['expose']['identifier']] = $input[$this->options['expose']['identifier']];
    }
    if (!empty($views_session)) {
      $session
        ->set('views', $views_session);
    }
  }

  /**
   * Add this filter to the query.
   *
   * Due to the nature of fapi, the value and the operator have an unintended
   * level of indirection. You will find them in $this->operator
   * and $this->value respectively.
   */
  public function query() {
    $this
      ->ensureMyTable();
    $this->query
      ->addWhere($this->options['group'], "{$this->tableAlias}.{$this->realField}", $this->value, $this->operator);
  }

  /**
   * Can this filter be used in OR groups?
   *
   * Some filters have complicated where clauses that cannot be easily used
   * with OR groups. Some filters must also use HAVING which also makes
   * them not groupable. These filters will end up in a special group
   * if OR grouping is in use.
   *
   * @return bool
   */
  public function canGroup() {
    return TRUE;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheMaxAge() {
    return Cache::PERMANENT;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheContexts() {
    $cache_contexts = [];

    // An exposed filter allows the user to change a view's filters. They accept
    // input from GET parameters, which are part of the URL. Hence a view with
    // an exposed filter is cacheable per URL.
    if ($this
      ->isExposed()) {
      $cache_contexts[] = 'url';
    }
    return $cache_contexts;
  }

  /**
   * {@inheritdoc}
   */
  public function getCacheTags() {
    return [];
  }

  /**
   * {@inheritdoc}
   */
  public function validate() {
    if (!empty($this->options['exposed']) && ($error = $this
      ->validateIdentifier($this->options['expose']['identifier']))) {
      return [
        $error,
      ];
    }
  }

  /**
   * Filter by no empty values, though allow the use of (string) "0".
   *
   * @param string $var
   *   The variable to evaluate.
   *
   * @return bool
   *   TRUE if the value is equal to an empty string, FALSE otherwise.
   */
  protected static function arrayFilterZero($var) {
    if (is_int($var)) {
      return $var != 0;
    }
    return trim($var) != '';
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DependencySerializationTrait::$_entityStorages	protected	property
DependencySerializationTrait::$_serviceIds	protected	property
DependencySerializationTrait::__sleep	public	function		2
DependencySerializationTrait::__wakeup	public	function		2
FilterPluginBase::$alwaysMultiple	protected	property	Disable the possibility to force a single value.	6
FilterPluginBase::$always_required	public	property	Disable the possibility to allow an exposed input to be optional.
FilterPluginBase::$group_info	public	property	Contains the information of the selected item in a grouped filter.
FilterPluginBase::$no_operator	public	property	Disable the possibility to use operators.	1
FilterPluginBase::$operator	public	property	Contains the operator which is used on the query.
FilterPluginBase::$value	public	property	Contains the actual value of the field,either configured in the views ui or entered in the exposed filters.
FilterPluginBase::acceptExposedInput	public	function	Determines if the input from a filter should change the generated query. Overrides HandlerBase::acceptExposedInput	2
FilterPluginBase::addGroupForm	public	function	Add a new group to the exposed filter groups.
FilterPluginBase::adminSummary	public	function	Display the filter on the administrative summary. Overrides HandlerBase::adminSummary	10
FilterPluginBase::arrayFilterZero	protected static	function	Filter by no empty values, though allow the use of (string) "0".
FilterPluginBase::buildExposedFiltersGroupForm	protected	function	Build the form to let users create the group of exposed filters.
FilterPluginBase::buildExposedForm	public	function	Render our chunk of the exposed filter form when selecting. Overrides HandlerBase::buildExposedForm
FilterPluginBase::buildExposeForm	public	function	Options form subform for exposed filter options. Overrides HandlerBase::buildExposeForm	4
FilterPluginBase::buildGroupForm	public	function	Displays the Build Group form.
FilterPluginBase::buildGroupOptions	protected	function	Provide default options for exposed filters.
FilterPluginBase::buildGroupSubmit	protected	function	Save new group items, re-enumerates and remove groups marked to delete.
FilterPluginBase::buildGroupValidate	protected	function	Validate the build group options form.
FilterPluginBase::buildOptionsForm	public	function	Provide the basic form which calls through to subforms. If overridden, it is best to call through to the parent, or to at least make sure all of the functions in this form are called. Overrides HandlerBase::buildOptionsForm	2
FilterPluginBase::buildValueWrapper	protected	function	Builds wrapper for value and operator forms.
FilterPluginBase::canBuildGroup	protected	function	Determine if a filter can be converted into a group. Only exposed filters with operators available can be converted into groups.
FilterPluginBase::canExpose	public	function	Determine if a filter can be exposed. Overrides HandlerBase::canExpose	5
FilterPluginBase::canGroup	public	function	Can this filter be used in OR groups?	1
FilterPluginBase::convertExposedInput	public	function	Transform the input from a grouped filter into a standard filter.
FilterPluginBase::defaultExposeOptions	public	function	Provide default options for exposed filters. Overrides HandlerBase::defaultExposeOptions	4
FilterPluginBase::defineOptions	protected	function	Information about options for all kinds of purposes will be held here. Overrides HandlerBase::defineOptions	6
FilterPluginBase::exposedInfo	public	function	Tell the renderer about our exposed form. This only needs to be overridden for particularly complex forms. And maybe not even then. Overrides HandlerBase::exposedInfo
FilterPluginBase::exposedTranslate	protected	function	Make some translations to a form item to make it more suitable to exposing.
FilterPluginBase::getCacheContexts	public	function	The cache contexts associated with this object. Overrides CacheableDependencyInterface::getCacheContexts	7
FilterPluginBase::getCacheMaxAge	public	function	The maximum age for which this object may be cached. Overrides CacheableDependencyInterface::getCacheMaxAge
FilterPluginBase::getCacheTags	public	function	The cache tags associated with this object. Overrides CacheableDependencyInterface::getCacheTags	1
FilterPluginBase::groupForm	public	function	Build a form containing a group of operator | values to apply as a single filter.
FilterPluginBase::groupMultipleExposedInput	public	function	Returns the options available for a grouped filter that users checkboxes as widget, and therefore has to be applied several times, one per item selected.
FilterPluginBase::hasValidGroupedValue	protected	function	Determines if the given grouped filter entry has a valid value.	1
FilterPluginBase::init	public	function	Overrides \Drupal\views\Plugin\views\HandlerBase::init(). Overrides HandlerBase::init	4
FilterPluginBase::isAGroup	public	function	Returns TRUE if the exposed filter works like a grouped filter. Overrides HandlerBase::isAGroup
FilterPluginBase::multipleExposedInput	public	function	Returns TRUE if users can select multiple groups items of a grouped exposed filter. Overrides HandlerBase::multipleExposedInput
FilterPluginBase::operatorForm	protected	function	Options form subform for setting the operator.	6
FilterPluginBase::operatorOptions	public	function	Provide a list of options for the default operator form.	5
FilterPluginBase::operatorSubmit	public	function	Perform any necessary changes to the form values prior to storage.
FilterPluginBase::operatorValidate	protected	function	Validate the operator form.
FilterPluginBase::prepareFilterSelectOptions	protected	function	Sanitizes the HTML select element's options.
FilterPluginBase::query	public	function	Add this filter to the query. Overrides HandlerBase::query	15
FilterPluginBase::showBuildGroupButton	protected	function	Shortcut to display the build_group/hide button.
FilterPluginBase::showBuildGroupForm	public	function	Shortcut to display the exposed options form.
FilterPluginBase::showExposeButton	public	function	Shortcut to display the expose/hide button. Overrides HandlerBase::showExposeButton
FilterPluginBase::showOperatorForm	public	function	Shortcut to display the operator form.
FilterPluginBase::showValueForm	protected	function	Shortcut to display the value form.
FilterPluginBase::storeExposedInput	public	function	If set to remember exposed input in the session, store it there. Overrides HandlerBase::storeExposedInput
FilterPluginBase::storeGroupInput	public	function	If set to remember exposed input in the session, store it there. This function is similar to storeExposedInput but modified to work properly when the filter is a group.
FilterPluginBase::submitOptionsForm	public	function	Simple submit handler. Overrides PluginBase::submitOptionsForm
FilterPluginBase::trustedCallbacks	public static	function	Lists the trusted callbacks provided by the implementing class. Overrides PluginBase::trustedCallbacks
FilterPluginBase::validate	public	function	Validate that the plugin is correct and can be saved. Overrides HandlerBase::validate	2
FilterPluginBase::validateExposeForm	public	function	Validate the options form. Overrides HandlerBase::validateExposeForm
FilterPluginBase::validateIdentifier	protected	function	Validates a filter identifier.
FilterPluginBase::validateOptionsForm	public	function	Simple validate handler. Overrides PluginBase::validateOptionsForm	1
FilterPluginBase::valueForm	protected	function	Options form subform for setting options.	7
FilterPluginBase::valueSubmit	protected	function	Perform any necessary changes to the form values prior to storage.	1
FilterPluginBase::valueValidate	protected	function	Validate the options form.	3
HandlerBase::$field	public	property	With field you can override the realField if the real field is not set.
HandlerBase::$moduleHandler	protected	property	The module handler.	3
HandlerBase::$query	public	property	Where the $query object will reside.	7
HandlerBase::$realField	public	property	The actual field in the database table, maybe different on other kind of query plugins/special handlers.
HandlerBase::$relationship	public	property	The relationship used for this field.
HandlerBase::$table	public	property	The table this handler is attached to.
HandlerBase::$tableAlias	public	property	The alias of the table of this handler which is used in the query.
HandlerBase::$viewsData	protected	property	The views data service.
HandlerBase::access	public	function	Check whether given user has access to this handler. Overrides ViewsHandlerInterface::access	4
HandlerBase::adminLabel	public	function	Return a string representing this handler's name in the UI. Overrides ViewsHandlerInterface::adminLabel	4
HandlerBase::breakString	public static	function	Breaks x,y,z and x+y+z into an array. Overrides ViewsHandlerInterface::breakString
HandlerBase::broken	public	function	Determines if the handler is considered 'broken', meaning it's a placeholder used when a handler can't be found. Overrides ViewsHandlerInterface::broken
HandlerBase::buildExtraOptionsForm	public	function	Provide a form for setting options.	1
HandlerBase::buildGroupByForm	public	function	Provide a form for aggregation settings.	1
HandlerBase::calculateDependencies	public	function	Calculates dependencies for the configured plugin. Overrides PluginBase::calculateDependencies	10
HandlerBase::caseTransform	protected	function	Transform a string by a certain method.
HandlerBase::defineExtraOptions	public	function	Provide defaults for the handler.
HandlerBase::displayExposedForm	public	function	Displays the Expose form.
HandlerBase::ensureMyTable	public	function	Ensure the main table for this handler is in the query. This is used a lot. Overrides ViewsHandlerInterface::ensureMyTable	2
HandlerBase::getDateField	public	function	Creates cross-database SQL dates.	2
HandlerBase::getDateFormat	public	function	Creates cross-database SQL date formatting.	2
HandlerBase::getEntityType	public	function	Determines the entity type used by this handler. Overrides ViewsHandlerInterface::getEntityType
HandlerBase::getField	public	function	Shortcut to get a handler's raw field value. Overrides ViewsHandlerInterface::getField
HandlerBase::getJoin	public	function	Get the join object that should be used for this handler. Overrides ViewsHandlerInterface::getJoin
HandlerBase::getModuleHandler	protected	function	Gets the module handler.
HandlerBase::getTableJoin	public static	function	Fetches a handler to join one table to a primary table from the data cache. Overrides ViewsHandlerInterface::getTableJoin
HandlerBase::getViewsData	protected	function	Gets views data service.
HandlerBase::hasExtraOptions	public	function	If a handler has 'extra options' it will get a little settings widget and another form called extra_options.	1
HandlerBase::isExposed	public	function	Determine if this item is 'exposed', meaning it provides form elements to let users modify the view.
HandlerBase::placeholder	protected	function	Provides a unique placeholders for handlers.
HandlerBase::postExecute	public	function	Run after the view is executed, before the result is cached. Overrides ViewsHandlerInterface::postExecute
HandlerBase::preQuery	public	function	Run before the view is built. Overrides ViewsHandlerInterface::preQuery	2
HandlerBase::sanitizeValue	public	function	Sanitize the value for output. Overrides ViewsHandlerInterface::sanitizeValue
HandlerBase::setModuleHandler	public	function	Sets the module handler.
HandlerBase::setRelationship	public	function	Called just prior to query(), this lets a handler set up any relationship it needs. Overrides ViewsHandlerInterface::setRelationship
HandlerBase::setViewsData	public	function
HandlerBase::showExposeForm	public	function	Shortcut to display the exposed options form. Overrides ViewsHandlerInterface::showExposeForm
HandlerBase::submitExposed	public	function	Submit the exposed handler form.
HandlerBase::submitExposeForm	public	function	Perform any necessary changes to the form exposes prior to storage. There is no need for this function to actually store the data.
HandlerBase::submitExtraOptionsForm	public	function	Perform any necessary changes to the form values prior to storage. There is no need for this function to actually store the data.
HandlerBase::submitFormCalculateOptions	public	function	Calculates options stored on the handler.	1
HandlerBase::submitGroupByForm	public	function	Perform any necessary changes to the form values prior to storage. There is no need for this function to actually store the data.	1
HandlerBase::submitTemporaryForm	public	function	A submit handler that is used for storing temporary items when using multi-step changes, such as ajax requests.
HandlerBase::usesGroupBy	public	function	Provides the handler some groupby.	13
HandlerBase::validateExposed	public	function	Validate the exposed handler form.	4
HandlerBase::validateExtraOptionsForm	public	function	Validate the options form.
HandlerBase::__construct	public	function	Constructs a Handler object. Overrides PluginBase::__construct	45
MessengerTrait::$messenger	protected	property	The messenger.	27
MessengerTrait::messenger	public	function	Gets the messenger.	27
MessengerTrait::setMessenger	public	function	Sets the messenger.
PluginBase::$configuration	protected	property	Configuration information passed into the plugin.	1
PluginBase::$definition	public	property	Plugins's definition.
PluginBase::$displayHandler	public	property	The display object this plugin is for.
PluginBase::$options	public	property	Options for this plugin will be held here.
PluginBase::$pluginDefinition	protected	property	The plugin implementation definition.	1
PluginBase::$pluginId	protected	property	The plugin_id.
PluginBase::$renderer	protected	property	Stores the render API renderer.	3
PluginBase::$usesOptions	protected	property	Denotes whether the plugin has an additional options form.	8
PluginBase::$view	public	property	The top object of a view.	1
PluginBase::create	public static	function	Creates an instance of the plugin. Overrides ContainerFactoryPluginInterface::create	63
PluginBase::DERIVATIVE_SEPARATOR		constant	A string which is used to separate base plugin IDs from the derivative ID.
PluginBase::destroy	public	function	Clears a plugin. Overrides ViewsPluginInterface::destroy	2
PluginBase::doFilterByDefinedOptions	protected	function	Do the work to filter out stored options depending on the defined options.
PluginBase::filterByDefinedOptions	public	function	Filter out stored options depending on the defined options. Overrides ViewsPluginInterface::filterByDefinedOptions
PluginBase::getAvailableGlobalTokens	public	function	Returns an array of available token replacements. Overrides ViewsPluginInterface::getAvailableGlobalTokens
PluginBase::getBaseId	public	function	Gets the base_plugin_id of the plugin instance. Overrides DerivativeInspectionInterface::getBaseId
PluginBase::getDerivativeId	public	function	Gets the derivative_id of the plugin instance. Overrides DerivativeInspectionInterface::getDerivativeId
PluginBase::getPluginDefinition	public	function	Gets the definition of the plugin implementation. Overrides PluginInspectionInterface::getPluginDefinition	2
PluginBase::getPluginId	public	function	Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
PluginBase::getProvider	public	function	Returns the plugin provider. Overrides ViewsPluginInterface::getProvider
PluginBase::getRenderer	protected	function	Returns the render API renderer.	1
PluginBase::globalTokenForm	public	function	Adds elements for available core tokens to a form. Overrides ViewsPluginInterface::globalTokenForm
PluginBase::globalTokenReplace	public	function	Returns a string with any core tokens replaced. Overrides ViewsPluginInterface::globalTokenReplace
PluginBase::INCLUDE_ENTITY		constant	Include entity row languages when listing languages.
PluginBase::INCLUDE_NEGOTIATED		constant	Include negotiated languages when listing languages.
PluginBase::isConfigurable	public	function	Determines if the plugin is configurable.
PluginBase::listLanguages	protected	function	Makes an array of languages, optionally including special languages.
PluginBase::pluginTitle	public	function	Return the human readable name of the display. Overrides ViewsPluginInterface::pluginTitle
PluginBase::preRenderAddFieldsetMarkup	public static	function	Moves form elements into fieldsets for presentation purposes. Overrides ViewsPluginInterface::preRenderAddFieldsetMarkup
PluginBase::preRenderFlattenData	public static	function	Flattens the structure of form elements. Overrides ViewsPluginInterface::preRenderFlattenData
PluginBase::queryLanguageSubstitutions	public static	function	Returns substitutions for Views queries for languages.
PluginBase::setOptionDefaults	protected	function	Fills up the options of the plugin with defaults.
PluginBase::summaryTitle	public	function	Returns the summary of the settings in the display. Overrides ViewsPluginInterface::summaryTitle	6
PluginBase::themeFunctions	public	function	Provide a full list of possible theme templates used by this style. Overrides ViewsPluginInterface::themeFunctions	1
PluginBase::unpackOptions	public	function	Unpack options over our existing defaults, drilling down into arrays so that defaults don't get totally blown away. Overrides ViewsPluginInterface::unpackOptions
PluginBase::usesOptions	public	function	Returns the usesOptions property. Overrides ViewsPluginInterface::usesOptions	8
PluginBase::viewsTokenReplace	protected	function	Replaces Views' tokens in a given string. The resulting string will be sanitized with Xss::filterAdmin.	1
PluginBase::VIEWS_QUERY_LANGUAGE_SITE_DEFAULT		constant	Query string to indicate the site default language.
StringTranslationTrait::$stringTranslation	protected	property	The string translation service.	4
StringTranslationTrait::formatPlural	protected	function	Formats a string containing a count of items.
StringTranslationTrait::getNumberOfPlurals	protected	function	Returns the number of plurals supported by a given language.
StringTranslationTrait::getStringTranslation	protected	function	Gets the string translation service.
StringTranslationTrait::setStringTranslation	public	function	Sets the string translation service to use.	2
StringTranslationTrait::t	protected	function	Translates a string to the current language or to a given language.
TrustedCallbackInterface::THROW_EXCEPTION		constant	Untrusted callbacks throw exceptions.
TrustedCallbackInterface::TRIGGER_SILENCED_DEPRECATION		constant	Untrusted callbacks trigger silenced E_USER_DEPRECATION errors.
TrustedCallbackInterface::TRIGGER_WARNING		constant	Untrusted callbacks trigger E_USER_WARNING errors.