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<?php
/**
* ElggMetadata
* This class describes metadata that can be attached to ElggEntities.
*
* @package Elgg.Core
* @subpackage Metadata
*/
class ElggMetadata extends ElggExtender {
protected function initializeAttributes() {
parent::initializeAttributes();
$this->attributes['type'] = "metadata";
}
/**
* Construct a new site object, optionally from a given id value or row.
*
* @param mixed $id ID of metadata from DB
*
* @return void
*/
function __construct($id = null) {
$this->initializeAttributes();
if (!empty($id)) {
// Create from db row
if ($id instanceof stdClass) {
$metadata = $id;
} else {
$metadata = elgg_get_metadata_from_id($id);
}
if ($metadata) {
$objarray = (array) $metadata;
foreach ($objarray as $key => $value) {
$this->attributes[$key] = $value;
}
}
}
}
/**
* Determines whether or not the user can edit this piece of metadata
*
* @return true|false Depending on permissions
*/
function canEdit() {
if ($entity = get_entity($this->get('entity_guid'))) {
return $entity->canEditMetadata($this);
}
return false;
}
/**
* Save matadata object
*
* @return int the metadata object id
*/
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 $this->id;
}
}
/**
* Delete a given metadata.
*
* @return bool
*/
function delete() {
return delete_metadata($this->id);
}
/**
* 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);
}
}
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