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 +++++++++++++++++++++++
 engine/lib/elgglib.php     | 35 ++++++++++++++++++++++++++++++++++-
 2 files changed, 57 insertions(+), 1 deletion(-)

(limited to 'engine/lib')

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.
diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php
index 7691ca5bb..fb61b7d10 100644
--- a/engine/lib/elgglib.php
+++ b/engine/lib/elgglib.php
@@ -1002,7 +1002,38 @@ function get_submenu() {
 
 	return $submenu_total;
 }
-
+/**
+ * Automatically views likes and a like input relating to the given entity
+ *
+ * @param ElggEntity $entity The entity to like
+ * @return string|false The HTML (etc) for the likes, or false on failure
+ */
+function elgg_view_likes($entity){
+	if (!($entity instanceof ElggEntity)) {
+		return false;
+	}
+	if ($likes = trigger_plugin_hook('likes',$entity->getType(),array('entity' => $entity),false)) {
+		return $likes;
+	} else {
+		//display the form
+		$likes = elgg_view('likes/forms/edit',array('entity' => $entity));
+		return $likes;
+	}
+}
+/**
+ * Count the number of likes attached to an entity
+ *
+ * @param ElggEntity $entity
+ * @return int Number of likes
+ */
+function elgg_count_likes($entity) {
+	if ($likeno = trigger_plugin_hook('likes:count', $entity->getType(),
+		array('entity' => $entity), false)) {
+		return $likeno;
+	} else {
+		return count_annotations($entity->getGUID(), "", "", "likes");
+	}
+}
 
 /**
  * Automatically views comments and a comment form relating to the given entity
@@ -2901,6 +2932,8 @@ function elgg_boot() {
 	// Actions
 	register_action('comments/add');
 	register_action('comments/delete');
+	register_action('likes/add');
+	register_action('likes/delete');
 
 	elgg_view_register_simplecache('css');
 	elgg_view_register_simplecache('js/friendsPickerv1');
-- 
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