001// Copyright 2014, The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014package org.apache.tapestry5.internal.services;
015
016import org.apache.tapestry5.MarkupWriter;
017import org.apache.tapestry5.commons.services.TypeCoercer;
018import org.apache.tapestry5.dom.Document;
019import org.apache.tapestry5.runtime.RenderCommand;
020import org.apache.tapestry5.services.PartialTemplateRenderer;
021import org.slf4j.Logger;
022import org.slf4j.LoggerFactory;
023
024public class PartialTemplateRendererImpl implements PartialTemplateRenderer
025{
026    
027    final private static Logger LOGGER = LoggerFactory.getLogger(PartialTemplateRendererImpl.class);
028    
029    final private TypeCoercer typeCoercer;
030
031    public PartialTemplateRendererImpl(TypeCoercer typeCoercer)
032    {
033        super();
034        this.typeCoercer = typeCoercer;
035    }
036
037    public Document renderAsDocument(Object object)
038    {
039        RenderCommand renderCommand = toRenderCommand(object);
040        MarkupWriter markupWriter = new MarkupWriterImpl(); 
041        RenderQueueImpl renderQueue = new RenderQueueImpl(LOGGER); 
042        renderQueue.push(renderCommand); 
043        renderQueue.run(markupWriter);
044        return markupWriter.getDocument();
045    }
046
047    public String render(Object object)
048    {
049        return renderAsDocument(object).toString();
050    }
051
052    private RenderCommand toRenderCommand(Object object)
053    {
054        RenderCommand renderCommand = null;
055        if (object instanceof RenderCommand)
056        {
057            renderCommand = (RenderCommand) object;
058        }
059        else {
060            try {
061                renderCommand = typeCoercer.coerce(object, RenderCommand.class); 
062            }
063            catch (RuntimeException e) {
064                throw new IllegalArgumentException(
065                        String.format("Couldn't find a coercion from %s to RenderCommand", object.getClass().getName()), e);
066            }
067        }
068        return renderCommand;
069    }
070
071}