org.apache.tapestry5.internal.services.AjaxPartialResponseRendererImpl Maven / Gradle / Ivy

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Central module for Tapestry, containing interfaces to the Java Servlet API and all core services and components.

There is a newer version: 5.8.6

// Copyright 2007, 2008, 2009, 2010 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;

    private final boolean compactJSON;

    public AjaxPartialResponseRendererImpl(MarkupWriterFactory factory,

    Request request,

    Response response,

    PartialMarkupRenderer partialMarkupRenderer,

    @Inject
    @Symbol(SymbolConstants.CHARSET)
    String outputEncoding,

    @Symbol(SymbolConstants.COMPACT_JSON)
    boolean compactJSON)
    {
        this.factory = factory;
        this.request = request;
        this.response = response;
        this.partialMarkupRenderer = partialMarkupRenderer;
        this.outputEncoding = outputEncoding;
        this.compactJSON = compactJSON;
    }

    public void renderPartialPageMarkup() throws IOException
    {
        // This is a complex area as we are trying to keep public and private services properly
        // separated, and trying to keep stateless and stateful (i.e., perthread scope) services
        // separated. 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());

        reply.print(pw, compactJSON);

        pw.close();
    }
}