resource_conflict.module in Resource Conflict 5

File

resource_conflict.module

<?php

/**
 * Implementation of hook_nodeapi
 *
 * Determine if a CCK nodereferenced resource is currently booked.
 */
function resource_conflict_nodeapi(&$node, $op, $teaser = NULL, $page = NULL) {
  $type = $node->type;
  switch ($op) {
    case 'validate':
      if (variable_get('resource_conflict_' . $type, FALSE)) {

        // Find the relevant fields to check against
        $fields = variable_get('resource_conflict_fields_' . $type, FALSE);
        if (empty($fields)) {
          break;
        }

        // Get all overlapping events
        $overlap = _resource_conflict_event_overlap($node->event_start, $node->event_end);
        if (empty($overlap)) {
          break;
        }
        foreach ($overlap as $nid) {

          // Don't have the node conflict with itself
          if ($nid != $node->nid) {
            $overlap_nodes[] = node_load($nid);
          }
        }
        if (empty($overlap_nodes)) {
          break;
        }
        foreach ($fields as $field) {
          foreach ($node->{$field} as $instance) {
            foreach ($overlap_nodes as $conflict) {

              // If there is empty variable $conflict->{$field} when you use more then one resource conflict contents
              if (empty($conflict->{$field})) {
                continue;
              }
              foreach ($conflict->{$field} as $conflict_instance) {
                if ($instance['nid'] == $conflict_instance['nid']) {
                  $booked_resource = node_load($instance['nid']);
                  form_set_error('Resource Conflict', t('There is a resource conflict. "%resource" is currently booked. Please choose a different time or a different resource.', array(
                    '%resource' => $booked_resource->title,
                  )));
                }
              }
            }
          }
        }
      }
      break;
  }
}

/**
 * Implementation of hook_form_alter
 *
 */
function resource_conflict_form_alter($form_id, &$form) {
  if ($form_id == 'node_type_form') {
    $type = isset($form['old_type']) && isset($form['old_type']['#value']) ? $form['old_type']['#value'] : NULL;
    $form['resource_conflict_set'] = array(
      '#type' => 'fieldset',
      '#title' => t('Resource Conflict'),
      '#collapsible' => TRUE,
    );
    $form['resource_conflict_set']['resource_conflict'] = array(
      '#type' => 'checkbox',
      '#title' => t('Enable resource conflict checking for this content type.'),
      '#default_value' => variable_get('resource_conflict_' . $type, 0),
      '#description' => t('If this is enabled, this content type must also be event enabled.'),
    );
    if ($type != NULL) {
      $fields = content_fields();
      foreach ($fields as $field) {
        if ($field['type'] == 'nodereference') {
          $nodereference_fields[$field['field_name']] = $field['widget']['label'];
        }
      }
    }
    if (empty($nodereference_fields)) {
      $form['resource_conflict_set']['no_nodreference_fields'] = array(
        '#value' => t('Please create some nodereference fields for this content type.'),
      );
    }
    else {
      $form['resource_conflict_set']['resource_conflict_fields'] = array(
        '#type' => 'select',
        '#title' => t('Fields to check for conflicts'),
        '#options' => $nodereference_fields,
        '#multiple' => TRUE,
        '#default_value' => variable_get('resource_conflict_fields_' . $type, FALSE),
        '#description' => t("Select the node reference resources which can't be booked at the same time."),
      );
    }
  }
}

/**
 * Determine if any events overlap the specified times
 *
 * 1. $start is within the event time
 * 2. $end end is within the event time
 * 3. The event encompasses $start and $end
 * 4. Allow the end of one event to occur at the start of the next
 *
 * @param $start
 *   The start time of events to search
 * @param $end
 *   The end time of events to search
 * @return
 *   An array of node ID's
 */
function _resource_conflict_event_overlap($start, $end) {
  $query = "SELECT nid FROM {event} WHERE (%d >= event_start AND %d < event_end)\n    OR (%d > event_start AND %d <= event_end)\n    OR (%d <= event_start AND %d >= event_end)";
  $result = db_query($query, $start, $start, $end, $end, $start, $end);

  // Create an array of all of the results
  while ($row = db_fetch_array($result)) {
    $rows[] = $row['nid'];
  }
  return $rows;
}

Functions

Name	Description
resource_conflict_form_alter	Implementation of hook_form_alter
resource_conflict_nodeapi	Implementation of hook_nodeapi
_resource_conflict_event_overlap	Determine if any events overlap the specified times