// Copyright 2007, 2008, 2009 The Apache Software Foundation

 //

 // 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.apache.tapestry5.internal.services;

 import org.apache.tapestry5.ContentType;

 import org.apache.tapestry5.MarkupWriter;

 import org.apache.tapestry5.SymbolConstants;

 import org.apache.tapestry5.internal.InternalConstants;

 import org.apache.tapestry5.ioc.annotations.Inject;

 import org.apache.tapestry5.ioc.annotations.Symbol;

 import org.apache.tapestry5.json.JSONObject;

 import org.apache.tapestry5.services.MarkupWriterFactory;

 import org.apache.tapestry5.services.PartialMarkupRenderer;

 import org.apache.tapestry5.services.Request;

 import org.apache.tapestry5.services.Response;

 import java.io.IOException;

 import java.io.PrintWriter;

 public class AjaxPartialResponseRendererImpl implements AjaxPartialResponseRenderer

 {

     private final MarkupWriterFactory factory;

     private final Request request;

     private final Response response;

     private final PartialMarkupRenderer partialMarkupRenderer;

     private final String outputEncoding;

     public AjaxPartialResponseRendererImpl(MarkupWriterFactory factory,

                                            Request request,

                                            Response response,

                                            PartialMarkupRenderer partialMarkupRenderer,

                                            @Inject @Symbol(SymbolConstants.CHARSET)

                                            String outputEncoding)

     {

         this.factory = factory;

         this.request = request;

         this.response = response;

         this.partialMarkupRenderer = partialMarkupRenderer;

         this.outputEncoding = outputEncoding;

     }

     public void renderPartialPageMarkup() throws IOException

     {

         // This is a complex area as we are trying to keep public and private services properly

         // seperated, and trying to keep stateless and stateful (i.e., perthread scope) services

         // seperated. So we inform the stateful queue service what it needs to do here ...

         ContentType pageContentType =

                 (ContentType) request.getAttribute(InternalConstants.CONTENT_TYPE_ATTRIBUTE_NAME);

         ContentType contentType = new ContentType(InternalConstants.JSON_MIME_TYPE, outputEncoding);

         MarkupWriter writer = factory.newPartialMarkupWriter(pageContentType);

         JSONObject reply = new JSONObject();

         // ... and here, the pipeline eventually reaches the PRQ to let it render the root render command.

         partialMarkupRenderer.renderMarkup(writer, reply);

         PrintWriter pw = response.getPrintWriter(contentType.toString());

         pw.print(reply);

         pw.close();

     }

 }