Added new objects class

git-svn-id: https://code.elgg.org/elgg/trunk@219 36083f99-b078-4883-b0ff-0f9b5a30f544

1 files changed, 264 insertions, 0 deletions

diff --git a/engine/lib/objects.php b/engine/lib/objects.php
new file mode 100644
index 000000000..900ea3f81
--- /dev/null
+++ b/engine/lib/objects.php
@@ -0,0 +1,264 @@
+<?php

+

+	/**

+	 * Elgg objects

+	 * Functions to manage multiple or single objects in an Elgg install

+	 * 

+	 * @package Elgg

+	 * @subpackage Core

+	 * @license http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU Public License version 2

+	 * @author Curverider Ltd

+	 * @copyright Curverider Ltd 2008

+	 * @link http://elgg.org/

+	 */

+

+	/**

+	 * @class ElggObject

+	 * Representation of an "object" in the system.

+	 */

+	class ElggObject extends ElggEntity

+	{

+		/**

+		 * Initialise the attributes array. 

+		 * This is vital to distinguish between metadata and base parameters.

+		 * 

+		 * Place your base parameters here.

+		 */

+		protected function initialise_attributes()

+		{

+			parent::initialise_attributes();

+			

+			$this->attributes['type'] = "object";

+			$this->attributes['title'] = "";

+			$this->attributes['description'] = "";

+			

+			

+		}

+				

+		/**

+		 * Construct a new object entity, optionally from a given id value.

+		 *

+		 * @param mixed $guid If an int, load that GUID. 

+		 * 	If a db row then will attempt to load the rest of the data.

+		 * @throws Exception if there was a problem creating the object. 

+		 */

+		function __construct($guid = null) 

+		{			

+			$this->initialise_attributes();

+			

+			if (!empty($guid))

+			{

+				// Is $guid is a DB row - either a entity row, or a object table row.

+				if ($guid instanceof stdClass) {					

+					// Load the rest

+					$this->load($guid->guid);

+				}

+				

+				// Is $guid is an ElggObject? Use a copy constructor

+				else if ($guid instanceof ElggObject)

+				{					

+					 foreach ($guid->attributes as $key => $value)

+					 	$this->attributes[$key] = $value;

+				}

+				

+				// Is this is an ElggEntity but not an ElggObject = ERROR!

+				else if ($guid instanceof ElggEntity)

+					throw new InvalidParameterException("Passing a non-ElggObject to an ElggObject constructor!");

+										

+				// We assume if we have got this far, $guid is an int

+				else if (is_int($guid)) {					

+					if (!$this->load($guid)) throw new IOException("Could not create a new ElggObject object from GUID:$guid");

+				}

+			}

+		}

+		

+		function __get($name) { return $this->get($name); }

+		function __set($name, $value) { return $this->set($name, $value); }

+		

+		/**

+		 * Override the load function.

+		 * This function will ensure that all data is loaded (were possible), so

+		 * if only part of the ElggObject is loaded, it'll load the rest.

+		 * 

+		 * @param int $guid

+		 * @return true|false 

+		 */

+		protected function load($guid)

+		{			

+			// Test to see if we have the generic stuff

+			if (!parent::load($guid)) 

+				return false;

+

+			// Check the type

+			if ($this->attributes['type']!='object')

+				throw new InvalidClassException("GUID:$guid is not a valid ElggObject");

+				

+			// Load missing data

+			$row = get_object_entity_as_row($guid);

+						

+			// Now put these into the attributes array as core values

+			$objarray = (array) $row;

+			foreach($objarray as $key => $value) 

+				$this->attributes[$key] = $value;

+			

+			return true;

+		}

+		

+		/**

+		 * Override the save function.

+		 * @return true|false

+		 */

+		public function save()

+		{

+			// Save generic stuff

+			if (!parent::save())

+				return false;

+			

+			// Now save specific stuff

+			return create_object_entity($this->get('guid'), $this->get('title'), $this->get('description'));

+		}

+		

+		/**

+		 * Delete this object.

+		 * @return true|false

+		 */

+		public function delete() 

+		{ 

+			if (!parent::delete())

+				return false;

+				

+			return delete_object_entity($guid);

+		}

+		

+		/**

+		 * Get the object's owner

+		 *

+		 * @return ElggUser The owner user

+		 */

+		function getOwner() {

+			return new ElggUser($this->owner_guid);			

+		}

+		

+		/**

+		 * Get sites that this object is a member of

+		 *

+		 * @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

+		 */

+		function getSites($subtype="", $limit = 10, $offset = 0) {

+			return get_site_objects($this->getGUID(), $subtype, $limit, $offset);

+		}

+		

+		/**

+		 * Add this object to a particular site

+		 *

+		 * @param int $site_guid The guid of the site to add it to

+		 * @return true|false

+		 */

+		function add_to_site($site_guid) {

+			return add_site_object($this->getGUID(), $site_guid); 

+		}

+

+		/**

+		 * Get the collections associated with a object.

+		 *

+		 * @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 unknown

+		 */

+		public function getCollections($subtype="", $limit = 10, $offset = 0) { get_object_collections($this->getGUID(), $subtype, $limit, $offset); }

+		

+	}

+

+	/**

+	 * Return the object specific details of a object by a row.

+	 * 

+	 * @param int $guid

+	 */

+	function get_object_entity_as_row($guid)

+	{

+		global $CONFIG;

+		

+		$guid = (int)$guid;

+		

+		return get_data_row("SELECT * from {$CONFIG->dbprefix}objects_entity where guid=$guid");

+	}

+	

+	/**

+	 * Create or update the extras table for a given object.

+	 * Call create_entity first.

+	 * 

+	 * @param int $guid

+	 * @param string $name

+	 * @param string $description

+	 * @param string $url

+	 */

+	function create_object_entity($guid, $name, $description, $url)

+	{

+		global $CONFIG;

+		

+		$guid = (int)$guid;

+		$name = sanitise_string($name);

+		$description = sanitise_string($description);

+		$url = sanitise_string($url);

+		

+		$row = get_entity_as_row($guid);

+		

+		if ($row)

+		{

+			// Exists and you have access to it

+			

+			// Delete any existing stuff

+			delete_object_entity($guid);

+

+			// Insert it

+			$result = insert_data("INSERT into {$CONFIG->dbprefix}objects_entity (guid, name, description, url) values ($guid, '$name','$description','$url')");

+			if ($result!==false) 

+				return true;

+		}

+		

+		return false;

+	}

+	

+	/**

+	 * Delete a object's extra data.

+	 * 

+	 * @param int $guid

+	 */

+	function delete_object_entity($guid)

+	{

+		global $CONFIG;

+		

+		$guid = (int)$guid;

+		

+		$row = get_entity_as_row($guid);

+		

+		// Check to see if we have access and it exists

+		if ($row) 

+		{

+			// Delete any existing stuff

+			return delete_data("DELETE from {$CONFIG->dbprefix}objects_entity where guid=$guid");

+		}

+		

+		return false;

+	}

+

+	/**

+	 * Get the sites this object is part of

+	 *

+	 * @param int $object_guid The object's GUID

+	 * @param int $limit Number of results to return

+	 * @param int $offset Any indexing offset

+	 * @return false|array On success, an array of ElggSites

+	 */

+	function get_object_sites($object_guid, $limit = 10, $offset = 0) {

+		$object_guid = (int)$object_guid;

+		$limit = (int)$limit;

+		$offset = (int)$offset;

+		

+		return get_entities_from_relationship("member_of_site", $object_guid, false, "site", "", 0, "time_created desc", $limit, $offset);

+	}

+		

+?>
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