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<?php
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/**
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* @file
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* Abstraction of the selection logic of an entity reference field.
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*
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* Implementations that wish to provide an implementation of this should
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* register it using CTools' plugin system.
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*/
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interface EntityReference_SelectionHandler {
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/**
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* Factory function: create a new instance of this handler for a given field.
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*
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* @param $field
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* A field datastructure.
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* @return EntityReferenceHandler
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*/
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public static function getInstance($field, $instance = NULL, $entity_type = NULL, $entity = NULL);
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/**
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* Return a list of referencable entities.
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*
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* @return
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* An array of referencable entities, which keys are entity ids and
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* values (safe HTML) labels to be displayed to the user.
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*/
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public function getReferencableEntities($match = NULL, $match_operator = 'CONTAINS', $limit = 0);
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/**
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* Count entities that are referencable by a given field.
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*/
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public function countReferencableEntities($match = NULL, $match_operator = 'CONTAINS');
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/**
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* Validate that entities can be referenced by this field.
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*
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* @return
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* An array of entity ids that are valid.
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*/
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public function validateReferencableEntities(array $ids);
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/**
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* Validate Input from autocomplete widget that has no Id.
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*
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* @see _entityreference_autocomplete_validate()
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*
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* @param $input
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* Single string from autocomplete widget.
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* @param $element
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* The form element to set a form error.
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* @return
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* Value of a matching entity id, or NULL if none.
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*/
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public function validateAutocompleteInput($input, &$element, &$form_state, $form);
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/**
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* Give the handler a chance to alter the SelectQuery generated by EntityFieldQuery.
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*/
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public function entityFieldQueryAlter(SelectQueryInterface $query);
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/**
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* Return the label of a given entity.
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*/
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public function getLabel($entity);
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/**
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* Generate a settings form for this handler.
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*/
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public static function settingsForm($field, $instance);
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}
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/**
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* A null implementation of EntityReference_SelectionHandler.
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*/
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class EntityReference_SelectionHandler_Broken implements EntityReference_SelectionHandler {
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public static function getInstance($field, $instance = NULL, $entity_type = NULL, $entity = NULL) {
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return new EntityReference_SelectionHandler_Broken($field, $instance, $entity_type, $entity);
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}
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protected function __construct($field, $instance) {
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$this->field = $field;
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$this->instance = $instance;
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}
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public static function settingsForm($field, $instance) {
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$form['selection_handler'] = array(
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'#markup' => t('The selected selection handler is broken.'),
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);
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return $form;
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}
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public function getReferencableEntities($match = NULL, $match_operator = 'CONTAINS', $limit = 0) {
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return array();
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}
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public function countReferencableEntities($match = NULL, $match_operator = 'CONTAINS') {
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return 0;
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}
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public function validateReferencableEntities(array $ids) {
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return array();
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}
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public function validateAutocompleteInput($input, &$element, &$form_state, $form) {
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return NULL;
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}
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public function entityFieldQueryAlter(SelectQueryInterface $query) {}
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public function getLabel($entity) {
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return '';
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}
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}
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