diff options
Diffstat (limited to 'engine/classes/ElggMetadata.php')
| -rw-r--r-- | engine/classes/ElggMetadata.php | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/engine/classes/ElggMetadata.php b/engine/classes/ElggMetadata.php new file mode 100644 index 000000000..7f45dc3ea --- /dev/null +++ b/engine/classes/ElggMetadata.php @@ -0,0 +1,154 @@ +<?php + +/** + * ElggMetadata + * This class describes metadata that can be attached to ElggEntities. + * + * @package Elgg.Core + * @subpackage Metadata + */ +class ElggMetadata extends ElggExtender { + + /** + * (non-PHPdoc) + * + * @see ElggData::initializeAttributes() + * + * @return void + */ + protected function initializeAttributes() { + parent::initializeAttributes(); + + $this->attributes['type'] = "metadata"; + } + + /** + * Construct a metadata object + * + * @param mixed $id ID of metadata or a database row as stdClass object + */ + function __construct($id = null) { + $this->initializeAttributes(); + + if (!empty($id)) { + // Create from db row + if ($id instanceof stdClass) { + $metadata = $id; + + $objarray = (array) $metadata; + foreach ($objarray as $key => $value) { + $this->attributes[$key] = $value; + } + } else { + // get an ElggMetadata object and copy its attributes + $metadata = elgg_get_metadata_from_id($id); + $this->attributes = $metadata->attributes; + } + } + } + + /** + * Determines whether or not the user can edit this piece of metadata + * + * @param int $user_guid The GUID of the user (defaults to currently logged in user) + * + * @return bool Depending on permissions + */ + function canEdit($user_guid = 0) { + if ($entity = get_entity($this->get('entity_guid'))) { + return $entity->canEditMetadata($this, $user_guid); + } + return false; + } + + /** + * Save metadata object + * + * @return int|bool the metadata object id or true if updated + * + * @throws IOException + */ + function save() { + if ($this->id > 0) { + return update_metadata($this->id, $this->name, $this->value, + $this->value_type, $this->owner_guid, $this->access_id); + } else { + $this->id = create_metadata($this->entity_guid, $this->name, $this->value, + $this->value_type, $this->owner_guid, $this->access_id); + + if (!$this->id) { + throw new IOException(elgg_echo('IOException:UnableToSaveNew', array(get_class()))); + } + return $this->id; + } + } + + /** + * Delete the metadata + * + * @return bool + */ + function delete() { + $success = elgg_delete_metastring_based_object_by_id($this->id, 'metadata'); + if ($success) { + // we mark unknown here because this deletes only one value + // under this name, and there may be others remaining. + elgg_get_metadata_cache()->markUnknown($this->entity_guid, $this->name); + } + return $success; + } + + /** + * Disable the metadata + * + * @return bool + * @since 1.8 + */ + function disable() { + $success = elgg_set_metastring_based_object_enabled_by_id($this->id, 'no', 'metadata'); + if ($success) { + // we mark unknown here because this disables only one value + // under this name, and there may be others remaining. + elgg_get_metadata_cache()->markUnknown($this->entity_guid, $this->name); + } + return $success; + } + + /** + * Enable the metadata + * + * @return bool + * @since 1.8 + */ + function enable() { + $success = elgg_set_metastring_based_object_enabled_by_id($this->id, 'yes', 'metadata'); + if ($success) { + elgg_get_metadata_cache()->markUnknown($this->entity_guid, $this->name); + } + return $success; + } + + /** + * Get a url for this item of metadata. + * + * @return string + */ + public function getURL() { + return get_metadata_url($this->id); + } + + // SYSTEM LOG INTERFACE //////////////////////////////////////////////////////////// + + /** + * For a given ID, return the object associated with it. + * This is used by the river functionality primarily. + * This is useful for checking access permissions etc on objects. + * + * @param int $id Metadata ID + * + * @return ElggMetadata + */ + public function getObjectFromID($id) { + return elgg_get_metadata_from_id($id); + } +} |