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<?php
/**
* The base class for ElggEntity extenders.
*
* Extenders allow you to attach extended information to an
* ElggEntity. Core supports two: ElggAnnotation, ElggMetadata,
* and ElggRelationship
*
* Saving the extender data to database is handled by the child class.
*
* @tip Plugin authors would probably want to extend either ElggAnnotation
* or ElggMetadata instead of this class.
*
* @package Elgg.Core
* @subpackage DataModel.Extender
* @link http://docs.elgg.org/DataModel/Extenders
* @see ElggAnnotation
* @see ElggMetadata
*/
abstract class ElggExtender extends ElggData
{
protected function initializeAttributes() {
parent::initializeAttributes();
$this->attributes['type'] = '';
}
/**
* Returns an attribute
*
* @param string $name Name
*
* @return mixed
*/
protected function get($name) {
if (isset($this->attributes[$name])) {
// Sanitise value if necessary
if ($name == 'value') {
switch ($this->attributes['value_type']) {
case 'integer' :
return (int)$this->attributes['value'];
break;
//case 'tag' :
//case 'file' :
case 'text' :
return ($this->attributes['value']);
break;
default :
$msg = elgg_echo('InstallationException:TypeNotSupported', array(
$this->attributes['value_type']));
throw new InstallationException($msg);
break;
}
}
return $this->attributes[$name];
}
return null;
}
/**
* Set an attribute
*
* @param string $name Name
* @param mixed $value Value
* @param string $value_type Value type
*
* @return boolean
*/
protected function set($name, $value, $value_type = "") {
$this->attributes[$name] = $value;
if ($name == 'value') {
$this->attributes['value_type'] = detect_extender_valuetype($value, $value_type);
}
return true;
}
/**
* Return the guid of the entity's owner.
*
* @return int The owner GUID
*/
public function getOwner() {
return $this->owner_guid;
}
/**
* Returns the ElggEntity or child object of the owner of the entity.
*
* @return ElggEntity The owning user
*/
public function getOwnerEntity() {
return get_entity($this->owner_guid);
}
/**
* Return the entity this describes.
*
* @return ElggEntity The enttiy
*/
public function getEntity() {
return get_entity($this->entity_guid);
}
/**
* Returns if a user can edit this extended data.
*
* @param int $user_guid The GUID of the user (defaults to currently logged in user)
*
* @return bool
*/
public function canEdit($user_guid = 0) {
return can_edit_extender($this->id, $this->type, $user_guid);
}
/*
* EXPORTABLE INTERFACE
*/
/**
* Return an array of fields which can be exported.
*
* @return array
*/
public function getExportableValues() {
return array(
'id',
'entity_guid',
'name',
'value',
'value_type',
'owner_guid',
'type',
);
}
/**
* Export this object
*
* @return array
*/
public function export() {
$uuid = get_uuid_from_object($this);
$meta = new ODDMetadata($uuid, guid_to_uuid($this->entity_guid), $this->attributes['name'],
$this->attributes['value'], $this->attributes['type'], guid_to_uuid($this->owner_guid));
$meta->setAttribute('published', date("r", $this->time_created));
return $meta;
}
/*
* SYSTEM LOG INTERFACE
*/
/**
* Return an identification for the object for storage in the system log.
* This id must be an integer.
*
* @return int
*/
public function getSystemLogID() {
return $this->id;
}
/**
* Return a type of extension.
*
* @return string
*/
public function getType() {
return $this->type;
}
/**
* Return a subtype. For metadata & annotations this is the 'name' and
* for relationship this is the relationship type.
*
* @return string
*/
public function getSubtype() {
return $this->name;
}
}
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