Petals BC REST

The JSON format 'ordered value list' seems to be not supported by genereric JSON<-->XML coverters, so we must find a way to convert it ourself:

• XML --> JSON can be done using an XSL, and espacially the XSL used to adapt the incoming XML payload (PETALSBCREST-26). So, it is sufficient to add a configuration parameter to not apply XML to JSON conversion:

  <rest:operation name="mailService:setVacationSignature">
                 <rest:http-method>POST</rest:http-method>
                 <rest:http-body-type>JSON</rest:http-body-type>
                 <rest:uri>${openpaas.mail-api.base-url}</rest:uri>
                 ...
                 <rest:xsl is-json-result="true">set-vacation-signature.xsl</rest:xsl>
                 ...
              </rest:operation>

• JSON --> XML can be done programmatically through a dedicated transformation type 'java' in which the JSON will be parsed, and XML will be generated:

  <rest:operation name="mailService:setVacationSignature">
                 <rest:http-method>POST</rest:http-method>
                 <rest:http-body-type>JSON</rest:http-body-type>
                 <rest:uri>${openpaas.mail-api.base-url}</rest:uri>
                 ...
                 <rest:on-http-status code="200">
                    <rest:otherwise-out>
                       <rest:transformation>
                          <rest:java>org.ow2.petals.samples.openpaas.technical.mail.OutTransformation</rest:java>
                       </rest:transformation>
                    </rest:otherwise-out>
                 </rest:on-http-status>
              </rest:operation>