/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource - guilherme.silveira@caelum.com.br
* All rights reserved.
*
* 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 br.com.caelum.vraptor.restfulie.serialization;
import java.util.List;
import br.com.caelum.vraptor.config.Configuration;
import br.com.caelum.vraptor.restfulie.Restfulie;
import br.com.caelum.vraptor.restfulie.hypermedia.ConfigurableHypermediaResource;
import br.com.caelum.vraptor.restfulie.hypermedia.HypermediaResource;
import br.com.caelum.vraptor.restfulie.relation.Relation;
import br.com.caelum.vraptor.restfulie.relation.RelationBuilder;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.ExtendedHierarchicalStreamWriterHelper;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
/**
* Reads all transitions from your resource object and converts them into link
* elements.<br>
* The converter passed in the constructor will be used to marshall the rest of
* the object.
*
* @author guilherme silveira
* @author lucas cavalcanti
* @author ac de souza
* @author marina melo
*/
public class LinkConverterJSON implements Converter {
private final Restfulie restfulie;
private final Converter base;
private final Configuration config;
public LinkConverterJSON(Converter base, Restfulie restfulie, Configuration config) {
this.base = base;
this.restfulie = restfulie;
this.config = config;
}
public void marshal(Object root, HierarchicalStreamWriter writer, MarshallingContext context) {
if (root instanceof ConfigurableHypermediaResource) {
context.convertAnother(((ConfigurableHypermediaResource) root).getModel());
} else {
base.marshal(root, writer, context);
}
HypermediaResource resource = (HypermediaResource) root;
RelationBuilder builder = restfulie.newRelationBuilder();
resource.configureRelations(builder);
if( !builder.getRelations().isEmpty() ) {
ExtendedHierarchicalStreamWriterHelper.startNode(writer, "links", List.class);
Link link = null;
for (Relation t : builder.getRelations()) {
link = new Link(t.getName(), config.getApplicationPath() + t.getUri());
ExtendedHierarchicalStreamWriterHelper.startNode(writer, "link", String.class);
context.convertAnother(link);
writer.endNode();
}
writer.endNode();
}
}
public Object unmarshal(HierarchicalStreamReader arg0,
UnmarshallingContext arg1) {
return base.unmarshal(arg0, arg1);
}
@SuppressWarnings("rawtypes")
public boolean canConvert(Class type) {
return HypermediaResource.class.isAssignableFrom(type)
&& base.canConvert(type);
}
}