class EmptySource in Zircon Profile 8

Source returning an empty row.

This is generally useful when needing to create a field using a migration..

Plugin annotation

@MigrateSource(
  id = "empty"
)

Hierarchy

• class \Drupal\Component\Plugin\PluginBase implements DerivativeInspectionInterface, PluginInspectionInterface
  • class \Drupal\Core\Plugin\PluginBase uses DependencySerializationTrait, StringTranslationTrait
    • class \Drupal\migrate\Plugin\migrate\source\SourcePluginBase implements MigrateSourceInterface
      • class \Drupal\migrate\Plugin\migrate\source\EmptySource

1 file declares its use of EmptySource

EmptySource.php in core/modules/migrate_drupal/src/Plugin/migrate/source/EmptySource.php

Contains \Drupal\migrate_drupal\Plugin\migrate\source\EmptySource.

File

core/modules/migrate/src/Plugin/migrate/source/EmptySource.php, line 19

Contains \Drupal\migrate\Plugin\migrate\source\EmptySource.

Namespace

Drupal\migrate\Plugin\migrate\source

class EmptySource extends SourcePluginBase {

  /**
   * {@inheritdoc}
   */
  public function fields() {
    return array(
      'id' => t('ID'),
    );
  }

  /**
   * {@inheritdoc}
   */
  public function initializeIterator() {
    return new \ArrayIterator(array(
      array(
        'id' => '',
      ),
    ));
  }
  public function __toString() {
    return '';
  }

  /**
   * {@inheritdoc}
   */
  public function getIds() {
    $ids['id']['type'] = 'string';
    return $ids;
  }

  /**
   * {@inheritdoc}
   */
  public function count() {
    return 1;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
DependencySerializationTrait::$_serviceIds	protected	property	An array of service IDs keyed by property name used for serialization.
DependencySerializationTrait::__sleep	public	function		1
DependencySerializationTrait::__wakeup	public	function		2
EmptySource::count	public	function	Get the source count. Overrides SourcePluginBase::count
EmptySource::fields	public	function	Returns available fields on the source. Overrides MigrateSourceInterface::fields
EmptySource::getIds	public	function	Defines the source fields uniquely identifying a source row. None of these fields should contain a NULL value - if necessary, use prepareRow() or hook_migrate_prepare_row() to rewrite NULL values to appropriate empty values (such as '' or 0). Overrides MigrateSourceInterface::getIds
EmptySource::initializeIterator	public	function	Initialize the iterator with the source data. Overrides SourcePluginBase::initializeIterator
EmptySource::__toString	public	function	Overrides MigrateSourceInterface::__toString
PluginBase::$configuration	protected	property	Configuration information passed into the plugin.	2
PluginBase::$pluginDefinition	protected	property	The plugin implementation definition.
PluginBase::$pluginId	protected	property	The plugin_id.
PluginBase::DERIVATIVE_SEPARATOR		constant	A string which is used to separate base plugin IDs from the derivative ID.
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
PluginBase::getPluginId	public	function	Gets the plugin_id of the plugin instance. Overrides PluginInspectionInterface::getPluginId
SourcePluginBase::$cache	protected	property
SourcePluginBase::$cacheCounts	protected	property	Whether this instance should cache the source count.
SourcePluginBase::$cacheKey	protected	property	Key to use for caching counts.
SourcePluginBase::$currentRow	protected	property	The current row from the query
SourcePluginBase::$currentSourceIds	protected	property	The primary key of the current row
SourcePluginBase::$highWaterProperty	protected	property	The name and type of the highwater property in the source.
SourcePluginBase::$idMap	protected	property
SourcePluginBase::$iterator	protected	property
SourcePluginBase::$mapRowAdded	protected	property	By default, next() will directly read the map row and add it to the data row. A source plugin implementation may do this itself (in particular, the SQL source can incorporate the map table into the query) - if so, it should set this TRUE so we…
SourcePluginBase::$migration	protected	property
SourcePluginBase::$moduleHandler	protected	property
SourcePluginBase::$originalHighWater	protected	property	The high water mark at the beginning of the import operation.
SourcePluginBase::$skipCount	protected	property	Whether this instance should not attempt to count the source.
SourcePluginBase::$trackChanges	protected	property	If TRUE, we will maintain hashed source rows to determine whether incoming data has changed.
SourcePluginBase::aboveHighwater	protected	function	Check if the incoming data is newer than what we've previously imported.
SourcePluginBase::current	public	function
SourcePluginBase::getCache	protected	function	Get the cache object.
SourcePluginBase::getCurrentIds	public	function	Getter for currentSourceIds data member.
SourcePluginBase::getIterator	protected	function	Returns the iterator that will yield the row arrays to be processed.
SourcePluginBase::getModuleHandler	protected	function	Get the module handler.
SourcePluginBase::key	public	function	Get the iterator key.
SourcePluginBase::next	public	function	The migration iterates over rows returned by the source plugin. This method determines the next row which will be processed and imported into the system.
SourcePluginBase::prepareRow	public	function	Add additional data to the row. Overrides MigrateSourceInterface::prepareRow	33
SourcePluginBase::rewind	public	function	Rewind the iterator.
SourcePluginBase::rowChanged	protected	function	Check if the incoming row has changed since our last import.
SourcePluginBase::valid	public	function	Whether the iterator is currently valid.
SourcePluginBase::__construct	public	function	Constructs a Drupal\Component\Plugin\PluginBase object. Overrides PluginBase::__construct	3
StringTranslationTrait::$stringTranslation	protected	property	The string translation service.
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.