Response.php

<?php
class Dsao_Ajax_Response
{
  const JSON = 'application/json';

  const PLAIN = 'text/plain';

  protected $_callbackHandler = null;

  protected $_contentType = null;

  protected $_data = array();

  protected $_messages = array();

  protected $_plainContent = '';

  public function getCallbackHandler()
  {
    return $this->_callbackHandler;
  }

  public function getContent()
  {
    // Falls reiner Text zurueckgegeben werden soll
    if (self::PLAIN == $this->_contentType)
    {
      return (string) $this->_data;
    }
    // Ansonsten kodieren
    else
    {
      return Zend_Json::encode(array
        (
          'callbackHandler' => $this->_callbackHandler,
          'data'            => $this->_data,
          'messages'        => $this->_messages,
        ));
    }
  }

  public function getContentType()
  {
    return ($this->_contentType ? $this->_contentType : self::JSON);
  }

  public function setCallbackHandler($callbackHandler)
  {
    $this->_callbackHandler = $callbackHandler;

    return $this;
  }

  public function setData($data, $contentType = self::JSON, $overwrite = true)
  {
    // Falls bereits Daten uebergeben wurden, neue ignorieren, sofern alte
    // Daten nicht ueberschrieben werden sollen
    if (!$overwrite && !empty($this->_data))
    {
      return $this;
    }

    $this->_data = $data;
    $this->_contentType = $contentType;

    return $this;
  }

  public function setMessages($messages)
  {
    // Falls ArrayObjekt uebergeben wurde
    if (is_object($messages))
    {
      $messages = $messages->getArrayCopy();
    }

    $this->_messages = $messages;

    return $this;
  }
}