/**
*
* Copyright 2009-2011 Rickard Öberg AB
*
* 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.qi4j.library.rest.server.restlet.responsewriter;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.qi4j.api.injection.scope.Service;
import org.qi4j.api.value.ValueDescriptor;
import org.restlet.Response;
import org.restlet.data.MediaType;
import org.restlet.representation.Representation;
import org.restlet.representation.WriterRepresentation;
import org.restlet.resource.ResourceException;
import org.restlet.service.MetadataService;
/**
* JAVADOC
*/
public class ResourceTemplateResponseWriter extends AbstractResponseWriter
{
private static final List<MediaType> supportedMediaTypes = Arrays.asList( MediaType.TEXT_HTML, MediaType.APPLICATION_ATOM );
@Service
private Configuration cfg;
@Service
private MetadataService metadataService;
Set<String> skip = new HashSet<String>();
@Override
public boolean writeResponse( final Object result, final Response response )
throws ResourceException
{
MediaType type = getVariant( response.getRequest(), ENGLISH, supportedMediaTypes ).getMediaType();
if( type != null )
{
// Try to find template for this specific resource
StringBuilder templateBuilder = (StringBuilder) response.getRequest().getAttributes().get( "template" );
String templateName = templateBuilder.toString();
if( result instanceof ValueDescriptor )
{
templateName += "_form";
}
final String extension = metadataService.getExtension( type );
templateName += "." + extension;
// Have we failed on this one before, then don't try again
if( skip.contains( templateName ) )
{
return false;
}
try
{
final Template template = cfg.getTemplate( templateName );
Representation rep = new WriterRepresentation( MediaType.TEXT_HTML )
{
@Override
public void write( Writer writer )
throws IOException
{
Map<String, Object> context = new HashMap<String, Object>();
context.put( "request", response.getRequest() );
context.put( "response", response );
context.put( "result", result );
try
{
template.process( context, writer );
}
catch( TemplateException e )
{
throw new IOException( e );
}
}
};
response.setEntity( rep );
return true;
}
catch( Exception e )
{
skip.add( templateName );
// Ignore
}
}
return false;
}
}