tapestry/tapestry-portlet/src/java/org/apache/tapestry/portlet/PortletRendererImpl.java

// Copyright 2005 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.tapestry.portlet;

import org.apache.tapestry.IMarkupWriter;
import org.apache.tapestry.IPage;
import org.apache.tapestry.IRequestCycle;
import org.apache.tapestry.Tapestry;
import org.apache.tapestry.asset.AssetFactory;
import org.apache.tapestry.markup.MarkupWriterSource;
import org.apache.tapestry.services.ResponseBuilder;
import org.apache.tapestry.services.impl.DefaultResponseBuilder;
import org.apache.tapestry.util.ContentType;
import org.apache.tapestry.web.WebResponse;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;

/**
 * The guts of rendering a page as a portlet response; used by
 * {@link org.apache.tapestry.portlet.RenderService} and
 * {@link org.apache.tapestry.portlet.PortletHomeService}.
 * 
 * @author Howard M. Lewis Ship
 * @since 4.0
 */
public class PortletRendererImpl implements PortletRenderer
{

    private WebResponse _response;

    private MarkupWriterSource _markupWriterSource;

    private AssetFactory _assetFactory;

    private String _applicationId;

    public void renderPage(IRequestCycle cycle, String pageName)
        throws IOException
    {
        cycle.activate(pageName);

        IPage page = cycle.getPage();
        
        ContentType contentType = page.getResponseContentType();
        PrintWriter printWriter = _response.getPrintWriter(contentType);
        IMarkupWriter writer = _markupWriterSource.newMarkupWriter(printWriter, contentType);
        String namespace = _response.getNamespace();
        
        IMarkupWriter nested = writer.getNestedWriter();

        ResponseBuilder builder = new DefaultResponseBuilder(nested, _assetFactory, namespace, false);
        
        builder.renderResponse(cycle);
        
        String id = "Tapestry Portlet " + _applicationId + " " + namespace;
        
        writer.comment("BEGIN " + id);
        writer.comment("Page: " + page.getPageName());
        writer.comment("Generated: " + new Date());
        writer.comment("Framework version: " + Tapestry.VERSION);
        
        builder.writeBodyScript(writer, cycle);
        
        nested.close();
        
        builder.writeInitializationScript(writer);

        writer.comment("END " + id);
        
        writer.close();
        
        // TODO: Trap errors and do some error reporting here?
    }

    public void setMarkupWriterSource(MarkupWriterSource markupWriterSource)
    {
        _markupWriterSource = markupWriterSource;
    }

    public void setResponse(WebResponse response)
    {
        _response = response;
    }

    public void setAssetFactory(AssetFactory assetFactory)
    {
        _assetFactory = assetFactory;
    }

    public void setApplicationId(String applicationId)
    {
        _applicationId = applicationId;
    }
}