From 64be91148a881f65224c583b92c407205db24634 Mon Sep 17 00:00:00 2001
From: dave <dave@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Sun, 21 Mar 2010 16:22:19 +0000
Subject: generic like this functionality added

git-svn-id: http://code.elgg.org/elgg/trunk@5456 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/lib/annotations.php | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'engine/lib/annotations.php')

diff --git a/engine/lib/annotations.php b/engine/lib/annotations.php
index b18475d57..b7dc1b9d3 100644
--- a/engine/lib/annotations.php
+++ b/engine/lib/annotations.php
@@ -1250,6 +1250,29 @@ function get_annotation_url($id) {
 	return false;
 }
 
+/**
+ * Check to see if a user has already created an annotation on an object
+ *
+ * @param ElggEntity $entity
+ * @return true | false
+ */
+function elgg_already_created_annotation($entity_guid, $annotation_type) {
+	global $CONFIG;
+	$entity_guid = (int)$entity_guid;
+	$annotation_type = sanitise_string($annotation_type);
+	$owner_guid = get_loggedin_userid();
+	$sql = "select a.id" .
+	 		" FROM {$CONFIG->dbprefix}annotations a, {$CONFIG->dbprefix}metastrings m " .
+	 		" WHERE a.owner_guid={$owner_guid} AND a.entity_guid={$entity_guid} " . 
+	 		" AND a.name_id=m.id AND m.string='{$annotation_type}'";
+	//get the annotation type id
+	$check_annotation = get_data_row($sql);
+	//check to see if the user has already liked
+	if($check_annotation)
+		return true;
+	else
+		return false;
+}
 
 /**
  * Register an annotation url handler.
-- 
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