consistent plugin usage - creativecommons (event)

this and followup commits touches:
    use load_languiage API
    class method parenthesis "\n{\n    <code>\n}\n",
    case break switches,
    consistent boolean usage,
    append css to eventData
    and other cleanups

plugins/serendipity_event_creativecommons/serendipity_event_creativecommons.php

@@ -2,7 +2,8 @@
 
 @serendipity_plugin_api::load_language(dirname(__FILE__));
 
-class serendipity_event_creativecommons extends serendipity_event {
+class serendipity_event_creativecommons extends serendipity_event
+{
     var $title = PLUGIN_CREATIVECOMMONS_NAME;
 
     function introspect(&$propbag)
@@ -12,9 +13,9 @@ class serendipity_event_creativecommons extends serendipity_event {
         $propbag->add('description',   PLUGIN_CREATIVECOMMONS_DESC);
         $propbag->add('stackable',     false);
         $propbag->add('author',        'Evan Nemerson');
-        $propbag->add('version',       '1.5');
+        $propbag->add('version',       '1.6');
         $propbag->add('requirements',  array(
-            'serendipity' => '0.8',
+            'serendipity' => '1.6',
             'smarty'      => '2.6.7',
             'php'         => '4.1.0'
         ));
@@ -71,8 +72,8 @@ class serendipity_event_creativecommons extends serendipity_event {
                 ));
                 $propbag->add('radio_per_row', '1');
                 $propbag->add('default', 'yes');
-
                 break;
+
             case 'image_type':
                 $image_types = array(
                     'generic'   => PLUGIN_CREATIVECOMMONS_IMAGETYPE_GENERIC,
@@ -95,18 +96,21 @@ class serendipity_event_creativecommons extends serendipity_event {
 
             default:
                 return false;
-                break;
         }
         return true;
     }
 
-    function generate_content(&$title) {
+    function generate_content(&$title)
+    {
         $title = $this->title;
     }
 
-    function event_hook($event, &$bag, &$eventData, $addData = null) {
+    function event_hook($event, &$bag, &$eventData, $addData = null)
+    {
         global $serendipity;
 
+        $hooks = &$bag->get('event_hooks');
+
         $license_data    = $this->get_license_data();
         $license_version = $this->get_config('cc_version', '3.0');
         $license_type    = $license_data['type'];
@@ -129,7 +133,10 @@ class serendipity_event_creativecommons extends serendipity_event {
 
         $cc_visibility = 'invisible';
 
-        switch ($event) {
+        if (isset($hooks[$event])) {
+
+            switch($event) {
+
                 case 'frontend_display:html_layout':
                     $cc_visibility = 'visible';
                 case 'frontend_display:html:per_entry':
@@ -163,17 +170,14 @@ class serendipity_event_creativecommons extends serendipity_event {
 
                     $eventData['display_dat'] .= '</License></rdf:RDF> -->';
                     $eventData['display_dat'] .= '</div>';
-                return true;
                     break;
 
                 case 'frontend_display:rss-2.0:per_entry':
                     $eventData['display_dat'] .= '<creativeCommons:license>'.$license_uri.'</creativeCommons:license>';
-                return true;
                     break;
 
                 case 'frontend_display:rss-1.0:per_entry':
                     $eventData['display_dat'] .= '<cc:license rdf:resource="'.$license_uri.'" />';
-                return true;
                     break;
 
                 case 'frontend_display:rss-1.0:once':
@@ -184,26 +188,28 @@ class serendipity_event_creativecommons extends serendipity_event {
                         }
                     }
                     $eventData['display_dat'] .= '</cc:License>';
-                return true;
                     break;
 
                 case 'frontend_display:rss-2.0:namespace':
                     $eventData['display_dat'] .= ' xmlns:creativeCommons="http://backend.userland.com/creativeCommonsRssModule" ';
-                return true;
                     break;
 
                 case 'frontend_display:rss-1.0:namespace':
                     $eventData['display_dat'] .= ' xmlns:cc="http://web.resource.org/cc/" ';
-                return true;
                     break;
 
                 default:
+                    return false;
+
+            }
             return true;
-                break;
+        } else {
+            return false;
         }
     }
 
-    function get_license_data() {
+    function get_license_data()
+    {
         $license_type = array();
         $license_version = $this->get_config('cc_version', '3.0');
 
@@ -355,6 +361,7 @@ class serendipity_event_creativecommons extends serendipity_event {
           'rdf'    => $rdf
         );
     }
+
 }
 
 /* vim: set sts=4 ts=4 expandtab : */