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<?php
/**
* Elgg Object
*
* Elgg objects are the most common means of storing information in the database.
* They are a child class of ElggEntity, so receive all the benefits of the Entities,
* but also include a title and description field.
*
* An ElggObject represents a row from the objects_entity table, as well
* as the related row in the entities table as represented by the parent
* ElggEntity object.
*
* @internal Title and description are stored in the objects_entity table.
*
* @package Elgg.Core
* @subpackage DataModel.Object
*
* @property string $title The title, name, or summary of this object
* @property string $description The body, description, or content of the object
* @property array $tags Array of tags that describe the object
*/
class ElggObject extends ElggEntity {
/**
* Initialise the attributes array to include the type,
* title, and description.
*
* @return void
*/
protected function initializeAttributes() {
parent::initializeAttributes();
$this->attributes['type'] = "object";
$this->attributes['title'] = NULL;
$this->attributes['description'] = NULL;
$this->attributes['tables_split'] = 2;
}
/**
* Load or create a new ElggObject.
*
* If no arguments are passed, create a new entity.
*
* If an argument is passed, attempt to load a full ElggObject entity.
* Arguments can be:
* - The GUID of an object entity.
* - A DB result object from the entities table with a guid property
*
* @param mixed $guid If an int, load that GUID. If a db row, then will attempt to
* load the rest of the data.
*
* @throws IOException If passed an incorrect guid
* @throws InvalidParameterException If passed an Elgg* Entity that isn't an ElggObject
*/
function __construct($guid = null) {
$this->initializeAttributes();
// compatibility for 1.7 api.
$this->initialise_attributes(false);
if (!empty($guid)) {
// Is $guid is a DB row from the entity table
if ($guid instanceof stdClass) {
// Load the rest
if (!$this->load($guid)) {
$msg = elgg_echo('IOException:FailedToLoadGUID', array(get_class(), $guid->guid));
throw new IOException($msg);
}
} else if ($guid instanceof ElggObject) {
// $guid is an ElggObject so this is a copy constructor
elgg_deprecated_notice('This type of usage of the ElggObject constructor was deprecated. Please use the clone method.', 1.7);
foreach ($guid->attributes as $key => $value) {
$this->attributes[$key] = $value;
}
} else if ($guid instanceof ElggEntity) {
// @todo remove - do not need separate exception
throw new InvalidParameterException(elgg_echo('InvalidParameterException:NonElggObject'));
} else if (is_numeric($guid)) {
// $guid is a GUID so load
if (!$this->load($guid)) {
throw new IOException(elgg_echo('IOException:FailedToLoadGUID', array(get_class(), $guid)));
}
} else {
throw new InvalidParameterException(elgg_echo('InvalidParameterException:UnrecognisedValue'));
}
}
}
/**
* Loads the full ElggObject when given a guid.
*
* @param mixed $guid GUID of an ElggObject or the stdClass object from entities table
*
* @return bool
* @throws InvalidClassException
*/
protected function load($guid) {
$attr_loader = new ElggAttributeLoader(get_class(), 'object', $this->attributes);
$attr_loader->requires_access_control = !($this instanceof ElggPlugin);
$attr_loader->secondary_loader = 'get_object_entity_as_row';
$attrs = $attr_loader->getRequiredAttributes($guid);
if (!$attrs) {
return false;
}
$this->attributes = $attrs;
$this->attributes['tables_loaded'] = 2;
_elgg_cache_entity($this);
return true;
}
/**
* Saves object-specific attributes.
*
* @internal Object attributes are saved in the objects_entity table.
*
* @return bool
*/
public function save() {
// Save ElggEntity attributes
if (!parent::save()) {
return false;
}
// Save ElggObject-specific attributes
return create_object_entity($this->get('guid'), $this->get('title'),
$this->get('description'));
}
/**
* Return sites that this object is a member of
*
* Site membership is determined by relationships and not site_guid.d
*
* @todo This should be moved to ElggEntity
* @todo Unimplemented
*
* @param string $subtype Optionally, the subtype of result we want to limit to
* @param int $limit The number of results to return
* @param int $offset Any indexing offset
*
* @return array|false
*/
function getSites($subtype = "", $limit = 10, $offset = 0) {
return get_site_objects($this->getGUID(), $subtype, $limit, $offset);
}
/**
* Add this object to a site
*
* @param int $site_guid The guid of the site to add it to
*
* @return bool
*/
function addToSite($site_guid) {
return add_site_object($this->getGUID(), $site_guid);
}
/*
* EXPORTABLE INTERFACE
*/
/**
* Return an array of fields which can be exported.
*
* @return array
*/
public function getExportableValues() {
return array_merge(parent::getExportableValues(), array(
'title',
'description',
));
}
/**
* Can a user comment on this object?
*
* @see ElggEntity::canComment()
*
* @param int $user_guid User guid (default is logged in user)
* @return bool
* @since 1.8.0
*/
public function canComment($user_guid = 0) {
$result = parent::canComment($user_guid);
if ($result !== null) {
return $result;
}
if ($user_guid == 0) {
$user_guid = elgg_get_logged_in_user_guid();
}
// must be logged in to comment
if (!$user_guid) {
return false;
}
// must be member of group
if (elgg_instanceof($this->getContainerEntity(), 'group')) {
if (!$this->getContainerEntity()->canWriteToContainer($user_guid)) {
return false;
}
}
// no checks on read access since a user cannot see entities outside his access
return true;
}
}
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