/**
*
* Copyright
* 2009-2015 Jayway Products AB
* 2016-2017 Föreningen Sambruk
*
* Licensed under AGPL, Version 3.0 (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.gnu.org/licenses/agpl.txt
*
* 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 se.streamsource.dci.restlet.server.responsewriter;
import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.qi4j.api.injection.scope.Service;
import org.qi4j.api.value.ValueComposite;
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;
import se.streamsource.dci.restlet.server.velocity.ValueCompositeContext;
import se.streamsource.dci.value.link.LinkValue;
import se.streamsource.dci.value.link.LinksValue;
import java.io.IOException;
import java.io.Writer;
import java.util.Arrays;
import java.util.List;
/**
* 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 );
private Template linksHtmlTemplate;
private Template linksAtomTemplate;
public LinksResponseWriter(@Service VelocityEngine velocity) throws Exception
{
linksHtmlTemplate = velocity.getTemplate( "rest/template/links.htm" );
linksAtomTemplate = velocity.getTemplate( "rest/template/links.atom" );
}
public boolean write( final Object result, final Response response ) throws ResourceException
{
if (result instanceof LinkValue)
{
MediaType type = getVariant( response.getRequest(), ENGLISH, supportedLinkMediaTypes ).getMediaType();
if (MediaType.APPLICATION_JSON.equals(type))
{
response.setEntity( new StringRepresentation(((LinkValue) result).toJSON(), MediaType.APPLICATION_JSON));
return true;
} else
{
response.setStatus( Status.REDIRECTION_TEMPORARY );
LinkValue link = (LinkValue) result;
Reference reference = new Reference( response.getRequest().getResourceRef(), link.href().get() );
response.setLocationRef( reference );
return true;
}
} else if (result instanceof LinksValue)
{
MediaType type = getVariant( response.getRequest(), ENGLISH, supportedLinksMediaTypes ).getMediaType();
if (MediaType.APPLICATION_JSON.equals( type ))
{
response.setEntity( new StringRepresentation(((LinksValue) result).toJSON(), MediaType.APPLICATION_JSON));
return true;
} else if (MediaType.TEXT_HTML.equals( type ))
{
Representation rep = new WriterRepresentation( MediaType.TEXT_HTML )
{
@Override
public void write( Writer writer ) throws IOException
{
VelocityContext context = new VelocityContext();
context.put( "request", response.getRequest() );
context.put( "response", response );
context.put( "result", new ValueCompositeContext((ValueComposite) result) );
linksHtmlTemplate.merge( context, writer );
}
};
response.setEntity( rep );
return true;
} else if (MediaType.APPLICATION_ATOM.equals( type ))
{
Representation rep = new WriterRepresentation( MediaType.APPLICATION_ATOM )
{
@Override
public void write( Writer writer ) throws IOException
{
VelocityContext context = new VelocityContext();
context.put( "request", response.getRequest() );
context.put( "response", response );
context.put( "result", new ValueCompositeContext((ValueComposite) result) );
linksAtomTemplate.merge( context, writer );
}
};
response.setEntity( rep );
return true;
}
}
return false;
}
}