/**
  * Handles static insertion for posts.
  * 
  * @remark            Only category taxonomy allow/deny check is supported. Other types post_tags and custom taxonomies are not supported yet.
  */
 public function doFilterForStaticInsertion($aPostContent, $aPostMeta = array())
 {
     // if the publish key exists, it means it is an update
     if (isset($aPostMeta['save']) && $aPostMeta['save'] == 'Update') {
         return $aPostContent;
     }
     // If it's auto-draft saving feature, do nothing.
     if (isset($aPostContent['post_status']) && $aPostContent['post_status'] != 'publish') {
         return $aPostContent;
     }
     // The default disabled post types.
     if (in_array($aPostContent['post_type'], array(AmazonAutoLinks_Registry::$aPostTypes['unit'], AmazonAutoLinks_Registry::$aPostTypes['auto_insert'], 'revision', 'attachment', 'nav_menu_item'))) {
         return $aPostContent;
     }
     /*    $aPostMeta structure
               [ID] => 278
               [post_category] => Array (
                   [0] => 0
                   [1] => 10
                   [2] => 9
                   [3] => 1
               )
               [tax_input] => Array(
                   [post_tag] => test
               )
           */
     $aSubjectPostInfo = array('post_id' => $aPostMeta['ID'], 'post_type' => $aPostContent['post_type'], 'term_ids' => $aPostMeta['post_category']) + self::$aStructure_SubjectPageInfo;
     $sPre = '';
     $sPost = '';
     foreach ($this->aFilterHooks['wp_insert_post_data'] as $iAutoInsertID) {
         if (!$this->isAutoInsertEnabledPage($iAutoInsertID, $aSubjectPostInfo)) {
             continue;
         }
         $aAutoInsertOptions = $this->aAutoInsertOptions[$iAutoInsertID];
         // position - above, below, or both,
         $sPosition = $aAutoInsertOptions['static_position'];
         if ($sPosition == 'above' || $sPosition == 'both') {
             $oUnits = new AmazonAutoLinks_Output(array('id' => $aAutoInsertOptions['unit_ids']));
             $sPre .= $oUnits->get();
         }
         if ($sPosition == 'below' || $sPosition == 'both') {
             $oUnits = new AmazonAutoLinks_Output(array('id' => $aAutoInsertOptions['unit_ids']));
             $sPost .= $oUnits->get();
         }
     }
     $aPostContent['post_content'] = $sPre . $aPostContent['post_content'] . $sPost;
     return $aPostContent;
 }