# JSONResponseReader.java

    /**
     *
     * Copyright 2009-2011 Rickard Öberg AB
     *
     * Licensed under the Apache License, Version 2.0 (the "License");
     * you may not use this file except in compliance with the License.
     * You may obtain a copy of the License at
     *
     *     http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing, software
     * distributed under the License is distributed on an "AS IS" BASIS,
     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     * See the License for the specific language governing permissions and
     * limitations under the License.
     */

    package org.qi4j.library.rest.client.responsereader;

    import java.util.Iterator;
    import org.json.JSONException;
    import org.json.JSONObject;
    import org.qi4j.api.injection.scope.Service;
    import org.qi4j.api.injection.scope.Structure;
    import org.qi4j.api.service.qualifier.Tagged;
    import org.qi4j.api.structure.Module;
    import org.qi4j.api.type.ValueCompositeType;
    import org.qi4j.api.value.ValueComposite;
    import org.qi4j.api.value.ValueDeserializer;
    import org.qi4j.api.value.ValueSerialization;
    import org.qi4j.library.rest.client.spi.ResponseReader;
    import org.restlet.Response;
    import org.restlet.data.Form;
    import org.restlet.data.MediaType;
    import org.restlet.resource.ResourceException;

    /**
     * JAVADOC
     */
    public class JSONResponseReader
       implements ResponseReader
    {
       @Structure
       private Module module;

       @Service
       @Tagged( ValueSerialization.Formats.JSON )
       private ValueDeserializer valueDeserializer;

        @Override
       public Object readResponse( Response response, Class<?> resultType )
       {
          if (response.getEntity().getMediaType().equals( MediaType.APPLICATION_JSON))
          {
             if (ValueComposite.class.isAssignableFrom( resultType ))
             {
                String jsonValue = response.getEntityAsText();
                ValueCompositeType valueType = module.valueDescriptor( resultType.getName() ).valueType();
                return valueDeserializer.deserialize( valueType, jsonValue );
             }
             else if (resultType.equals(Form.class))
             {
                try
                {
                   String jsonValue = response.getEntityAsText();
                   JSONObject jsonObject = new JSONObject(jsonValue);
                   Iterator<?> keys = jsonObject.keys();
                   Form form = new Form();
                   while (keys.hasNext())
                   {
                      Object key = keys.next();
                      form.set(key.toString(), jsonObject.get(key.toString()).toString());
                   }
                   return form;
                } catch (JSONException e)
                {
                   throw new ResourceException(e);
                }
             }
          }

          return null;
       }
    }