/**
  * Sets the default option values for the setting form.
  * @callback    filter      `options_{class name}`
  * @return      array       The options array.
  */
 public function setOptions($aOptions)
 {
     $_aUnitOptions = array();
     if (isset($_GET['post'])) {
         $_aUnitOptions = AmazonAutoLinks_WPUtility::getPostMeta($_GET['post']);
     }
     // Set some items for the edit mode.
     $_iMode = !isset($_GET['post']);
     // 0: edit, 1: new
     $_aOptions = array('mode' => $_iMode);
     if (!$_iMode) {
         $_aOptions['bounce_url'] = AmazonAutoLinks_WPUtility::getPostDefinitionEditPageURL($_GET['post'], AmazonAutoLinks_Registry::$aPostTypes['unit']);
     }
     $_aOptions = $aOptions + $_aOptions + $_aUnitOptions + $this->_getLastUnitInputs();
     return $_aOptions;
 }