From af2e2ae369e0ab13a99b83a928363f6d7f48f715 Mon Sep 17 00:00:00 2001
From: marcus <marcus@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Thu, 17 Jul 2008 10:44:26 +0000
Subject: Closes #160

git-svn-id: https://code.elgg.org/elgg/trunk@1452 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/lib/entities.php     | 42 ++++++++++++++++++++++++++++++++++++++++++
 engine/lib/extender.php     |  5 ++++-
 services/export/handler.php |  4 ++++
 3 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/engine/lib/entities.php b/engine/lib/entities.php
index c93b1c2c7..57578362c 100644
--- a/engine/lib/entities.php
+++ b/engine/lib/entities.php
@@ -1289,6 +1289,45 @@
 		
 		return true;
 	}
+	
+	/**
+	 * A plugin hook to get certain volitile (generated on the fly) attributes about an entity in order to export them.
+	 *
+	 * @param unknown_type $hook
+	 * @param unknown_type $entity_type
+	 * @param unknown_type $returnvalue
+	 * @param unknown_type $params The parameters, passed 'guid' and 'varname'
+	 * @return unknown
+	 */
+	function volatile_data_export_plugin_hook($hook, $entity_type, $returnvalue, $params)
+	{
+		$guid = (int)$params['guid'];
+		$variable_name = sanitise_string($params['varname']);
+		
+		if (($hook == 'volatile') && ($entity_type == 'metadata'))
+		{
+			if (($guid) && ($variable_name))
+			{
+				switch ($variable_name)
+				{
+					case 'renderedentity' :
+						elgg_set_viewtype('default');
+						$view = elgg_view_entity(get_entity($guid));
+						elgg_set_viewtype();
+						
+						$tmp = new ElggMetadata();
+						$tmp->type = 'volatile';
+						$tmp->name = 'renderedentity';
+						$tmp->value = $view;
+						$tmp->entity_guid = $guid;
+						
+						return $tmp;
+				
+					break;
+				}
+			}
+		}
+	}
 
 	/**
 	 * Handler called by trigger_plugin_hook on the "export" event.
@@ -1563,6 +1602,9 @@
 	/** Register the hook, ensuring entities are serialised first */
 	register_plugin_hook("export", "all", "export_entity_plugin_hook", 0);
 	
+	/** Hook to get certain named bits of volatile data about an entity */
+	register_plugin_hook('volatile', 'metadata', 'volatile_data_export_plugin_hook');
+	
 	/** Register init system event **/
 	register_elgg_event_handler('init','system','entities_init');
 	
diff --git a/engine/lib/extender.php b/engine/lib/extender.php
index b2482cd80..85908d62a 100644
--- a/engine/lib/extender.php
+++ b/engine/lib/extender.php
@@ -123,7 +123,10 @@
 		public function export()
 		{
 			$type = $this->attributes['type'];
-			$uuid = guid_to_uuid($this->entity_guid). $type . "/{$this->id}/";
+			if ($type == 'volatile')
+				$uuid = guid_to_uuid($this->entity_guid). $type . "/{$this->name}/";
+			else
+				$uuid = guid_to_uuid($this->entity_guid). $type . "/{$this->id}/";
 			
 			$meta = new ODDMetadata($uuid, guid_to_uuid($this->entity_guid), $this->attributes['name'], $this->attributes['value'], $type, guid_to_uuid($this->owner_guid));
 			$meta->setAttribute('published', date("r", $this->time_created));
diff --git a/services/export/handler.php b/services/export/handler.php
index 2318e4ea8..b6e5edc1b 100644
--- a/services/export/handler.php
+++ b/services/export/handler.php
@@ -78,6 +78,10 @@
 			case 'relationship' :
 				$r = get_relationship($id_or_name);
 			break;
+			case 'volatile' :
+				error_log("******************* ID NAME $id_or_name $uuid");
+				$m = trigger_plugin_hook('volatile', 'metadata', array('guid' => $guid, 'varname' => $id_or_name));
+			break;
 				
 			default :
 				throw new InvalidParameterException(sprintf(elgg_echo('InvalidParameterException:CanNotExportType'), $type));
-- 
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