001// Licensed under the Apache License, Version 2.0 (the "License");
002// you may not use this file except in compliance with the License.
003// You may obtain a copy of the License at
004//
005// http://www.apache.org/licenses/LICENSE-2.0
006//
007// Unless required by applicable law or agreed to in writing, software
008// distributed under the License is distributed on an "AS IS" BASIS,
009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
010// See the License for the specific language governing permissions and
011// limitations under the License.
012
013package org.apache.tapestry5.internal.services;
014
015import org.apache.tapestry5.ContentType;
016import org.apache.tapestry5.MarkupWriter;
017import org.apache.tapestry5.SymbolConstants;
018import org.apache.tapestry5.TapestryConstants;
019import org.apache.tapestry5.internal.InternalConstants;
020import org.apache.tapestry5.ioc.IOOperation;
021import org.apache.tapestry5.ioc.annotations.Inject;
022import org.apache.tapestry5.ioc.annotations.Symbol;
023import org.apache.tapestry5.json.JSONObject;
024import org.apache.tapestry5.services.MarkupWriterFactory;
025import org.apache.tapestry5.services.PartialMarkupRenderer;
026import org.apache.tapestry5.services.Request;
027import org.apache.tapestry5.services.Response;
028
029import java.io.IOException;
030import java.io.PrintWriter;
031
032public class AjaxPartialResponseRendererImpl implements AjaxPartialResponseRenderer
033{
034    private final MarkupWriterFactory factory;
035
036    private final Request request;
037
038    private final Response response;
039
040    private final PartialMarkupRenderer partialMarkupRenderer;
041
042    private final boolean compactJSON;
043
044    private final ContentType contentType;
045
046    public AjaxPartialResponseRendererImpl(MarkupWriterFactory factory,
047
048                                           Request request,
049
050                                           Response response,
051
052                                           PartialMarkupRenderer partialMarkupRenderer,
053
054                                           @Inject
055                                           @Symbol(SymbolConstants.CHARSET)
056                                           String outputEncoding,
057
058                                           @Symbol(SymbolConstants.COMPACT_JSON)
059                                           boolean compactJSON)
060    {
061        this.factory = factory;
062        this.request = request;
063        this.response = response;
064        this.partialMarkupRenderer = partialMarkupRenderer;
065        this.compactJSON = compactJSON;
066
067        contentType = new ContentType(InternalConstants.JSON_MIME_TYPE).withCharset(outputEncoding);
068    }
069
070    public void renderPartialPageMarkup(final JSONObject reply) throws IOException
071    {
072        assert reply != null;
073
074        request.setAttribute(TapestryConstants.RESPONSE_RENDERER, new IOOperation<Void>()
075        {
076            public Void perform() throws IOException
077            {
078                // This is a complex area as we are trying to keep public and private services properly
079                // separated, and trying to keep stateless and stateful (i.e., perthread scope) services
080                // separated. So we inform the stateful queue service what it needs to do here ...
081
082                String pageName = (String) request.getAttribute(InternalConstants.PAGE_NAME_ATTRIBUTE_NAME);
083
084                MarkupWriter writer = factory.newPartialMarkupWriter(pageName);
085
086                // ... and here, the pipeline eventually reaches the PRQ to let it render the root render command.
087
088                partialMarkupRenderer.renderMarkup(writer, reply);
089
090                PrintWriter pw = response.getPrintWriter(contentType.toString());
091
092                reply.print(pw, compactJSON);
093
094                pw.close();
095
096                return null;
097            }
098        });
099    }
100
101    public void renderPartialPageMarkup() throws IOException
102    {
103        renderPartialPageMarkup(new JSONObject());
104    }
105}