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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 and ElggMetadata.
+ *
+ * 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
+ *
+ * @property string $type annotation or metadata (read-only after save)
+ * @property int $id The unique identifier (read-only)
+ * @property int $entity_guid The GUID of the entity that this extender describes
+ * @property int $access_id Specifies the visibility level of this extender
+ * @property string $name The name of this extender
+ * @property mixed $value The value of the extender (int or string)
+ * @property int $time_created A UNIX timestamp of when the extender was created (read-only, set on first save)
+ */
+abstract class ElggExtender extends ElggData {
+
+ /**
+ * (non-PHPdoc)
+ *
+ * @see ElggData::initializeAttributes()
+ *
+ * @return void
+ */
+ protected function initializeAttributes() {
+ parent::initializeAttributes();
+
+ $this->attributes['type'] = NULL;
+ }
+
+ /**
+ * Returns an attribute
+ *
+ * @param string $name Name
+ *
+ * @return mixed
+ */
+ protected function get($name) {
+ if (array_key_exists($name, $this->attributes)) {
+ // Sanitise value if necessary
+ if ($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;
+ }
+
+ /**
+ * Get the GUID of the extender's owner entity.
+ *
+ * @return int The owner GUID
+ */
+ public function getOwnerGUID() {
+ return $this->owner_guid;
+ }
+
+ /**
+ * Return the guid of the entity's owner.
+ *
+ * @return int The owner GUID
+ * @deprecated 1.8 Use getOwnerGUID
+ */
+ public function getOwner() {
+ elgg_deprecated_notice("ElggExtender::getOwner deprecated for ElggExtender::getOwnerGUID", 1.8);
+ return $this->getOwnerGUID();
+ }
+
+ /**
+ * Get the entity that owns this extender
+ *
+ * @return ElggEntity
+ */
+ public function getOwnerEntity() {
+ return get_entity($this->owner_guid);
+ }
+
+ /**
+ * Get the entity this describes.
+ *
+ * @return ElggEntity The entity
+ */
+ 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;
+ }
+
+}