eck_shared_entities.module

<?php

/**
 * Implements hook_ctools_plugin_directory().
 */
function eck_shared_entities_ctools_plugin_directory($owner, $plugin_type) {
  if ($owner == 'eck' && $plugin_type == 'property_behavior') {
    return 'plugins/eck/' . $plugin_type;
  }
  if ($owner == 'entityreference' && $plugin_type == 'selection') {
    return 'plugins/entityreference/' . $plugin_type;
  }
}

/**
 * Implements hook_permission().
 */
function eck_shared_entities_permission() {
  $permissions = array(
    'edit share flag for all entities' => array(
      'title' => t('Can edit share flag for all entities'),
      'description' => t('Allow the user to mark entities of all types as shared.'),
    ),
  );

  foreach (EntityType::loadAll() as $entity_type) {
    if (isset($entity_type->properties['shared'])) {
      foreach (Bundle::loadByEntityType($entity_type) as $bundle) {
        $permissions += array(
          'edit share flag for ' . $entity_type->name . ' ' . $bundle->name . ' entities' => array(
            'title' => t('Can edit share flag for ' . $bundle->label . ' entities'),
            'description' => t('Allow the user to mark ' . $bundle->label . ' (' . $entity_type->label . ') entities as shared.'),
          ),
        );
      }
    }
  }
  return $permissions;
}

/**
 * Implements hook_eck_default_properties().
 */
function eck_shared_entities_eck_default_properties() {
  $default_properties = array();

  $default_properties['shared'] = array(
    'label' => 'Shared Entity',
    'type' => 'integer',
    'behavior' => 'shared_entity',
  );

  $default_properties['shared_title'] = array(
    'label' => 'Shared Entity Title',
    'type' => 'text',
    'behavior' => 'shared_entity_title',
  );

  return $default_properties;
}

/**
 * Implements hook_query_TAG_alter().
 */
function eck_shared_entities_query_shared_entities_alter(QueryAlterableInterface $query) {

  $or_properties = array('title', 'shared_title');
  $filter_condition = db_or();
  $match = $query->getMetaData('match');
  $match_operator = $query->getMetaData('match_operator');
  $entity_type = $query->getMetaData('entityreference_selection_handler')->entity_type;
  $entity_info = entity_get_info($entity_type);

  $condition_value = $match;
  $condition_operator = '=';

  if ($match_operator == 'CONTAINS') {
    $condition_value = '%' . $match . '%';
    $condition_operator = 'LIKE';
  }

  foreach ($or_properties as $or_property) {
    $filter_condition->condition($entity_info['base_table'] . $or_property, $condition_value, $condition_operator);
  }

  $query->condition($filter_condition);
}