/**
*
* 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.TemplateException;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.qi4j.api.injection.scope.Service;
import org.qi4j.library.rest.common.link.Link;
import org.qi4j.library.rest.common.link.Links;
import org.restlet.Response;
import org.restlet.data.MediaType;
import org.restlet.data.Reference;
import org.restlet.data.Status;
import org.restlet.representation.Representation;
import org.restlet.representation.StringRepresentation;
import org.restlet.representation.WriterRepresentation;
import org.restlet.resource.ResourceException;
/**
* JAVADOC
*/
public class LinksResponseWriter
extends AbstractResponseWriter
{
private static final List<MediaType> supportedLinkMediaTypes = Arrays.asList( MediaType.APPLICATION_JSON );
private static final List<MediaType> supportedLinksMediaTypes = Arrays.asList( MediaType.TEXT_HTML, MediaType.APPLICATION_JSON, MediaType.APPLICATION_ATOM );
@Service
Configuration cfg;
@Override
public boolean writeResponse( final Object result, final Response response )
throws ResourceException
{
if( result instanceof Link )
{
MediaType type = getVariant( response.getRequest(), ENGLISH, supportedLinkMediaTypes ).getMediaType();
if( MediaType.APPLICATION_JSON.equals( type ) )
{
response.setEntity( new StringRepresentation( ( (Link) result ).toString(), MediaType.APPLICATION_JSON ) );
return true;
}
else
{
response.setStatus( Status.REDIRECTION_TEMPORARY );
Link link = (Link) result;
Reference reference = new Reference( response.getRequest().getResourceRef(), link.href().get() );
response.setLocationRef( reference );
return true;
}
}
else if( result instanceof Links )
{
MediaType type = getVariant( response.getRequest(), ENGLISH, supportedLinksMediaTypes ).getMediaType();
Representation rep;
if( MediaType.APPLICATION_JSON.equals( type ) )
{
rep = createJsonRepresentation( (Links) result );
}
else if( MediaType.TEXT_HTML.equals( type ) )
{
rep = createTextHtmlRepresentation( result, response );
}
else if( MediaType.APPLICATION_ATOM.equals( type ) )
{
rep = createAtomRepresentation( result, response );
}
else
{
return false;
}
response.setEntity( rep );
return true;
}
return false;
}
private StringRepresentation createJsonRepresentation( Links result )
{
return new StringRepresentation( result.toString(), MediaType.APPLICATION_JSON );
}
private Representation createTextHtmlRepresentation( final Object result, final Response response )
{
return 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
{
cfg.getTemplate( "links.htm" ).process( context, writer );
}
catch( TemplateException e )
{
throw new IOException( e );
}
}
};
}
private Representation createAtomRepresentation( final Object result, final Response response )
{
return new WriterRepresentation( MediaType.APPLICATION_ATOM )
{
@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
{
cfg.getTemplate( "links.atom" ).process( context, writer );
}
catch( TemplateException e )
{
throw new IOException( e );
}
}
};
}
}