/**
     * Tests InputAtomConverter->convertAppData()
     */
    public function testConvertAppData()
    {
        $xml = '<?xml version="1.0" encoding="UTF-8"?>
<entry>
    <content type="application/xml">
      <appdata xmlns="http://ns.opensocial.org/2008/opensocial">
        <sign>Virgo</sign>
      </appdata>
    </content>
    <author>
      <uri>urn:guid:1</uri>
      <name>api.example.org:1</name>
    </author>
    <id>urn:guid:1</id>
    <title>appdata id 1</title>
    <updated>2008-08-06T22:36:20+02:00</updated>
  </entry>';
        $appdata = $this->InputAtomConverter->convertAppData($xml);
        $expect = array('sign' => 'Virgo');
        $this->assertEquals($expect, $appdata);
    }
 private function decodeRequests($requestParam, $requestType, $format = 'json')
 {
     if (empty($requestParam)) {
         return null;
     }
     switch ($format) {
         case 'json':
             $inputConverter = new InputJsonConverter();
             break;
         case 'atom':
             $inputConverter = new InputAtomConverter();
             break;
         default:
             throw new Exception("Invalid or unsupported input format");
             break;
     }
     switch ($requestType) {
         case 'people':
             $ret = $inputConverter->convertPeople($requestParam);
             break;
         case 'activities':
             $ret = $inputConverter->convertActivities($requestParam);
             break;
         case 'messages':
             $ret = $inputConverter->convertMessages($requestParam);
             break;
         case 'appdata':
             $ret = $inputConverter->convertAppData($requestParam);
             break;
         case 'jsonbatch':
             // this type is only used by the internal json batch format
             if ($format != 'json') {
                 throw new Exception("the json batch only supports the json input format");
             }
             $ret = $inputConverter->convertJsonBatch($requestParam);
             break;
             //TODO add 'groups' and 'messages' here
         //TODO add 'groups' and 'messages' here
         default:
             throw new Exception("Unsupported REST call");
             break;
     }
     return $ret;
 }