/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource 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.serialization.gson;
import java.io.IOException;
import java.util.Arrays;
import javax.servlet.http.HttpServletResponse;
import br.com.caelum.vraptor.interceptor.TypeNameExtractor;
import br.com.caelum.vraptor.ioc.Component;
import br.com.caelum.vraptor.serialization.JSONSerialization;
import br.com.caelum.vraptor.serialization.NoRootSerialization;
import br.com.caelum.vraptor.serialization.ProxyInitializer;
import br.com.caelum.vraptor.serialization.Serializer;
import br.com.caelum.vraptor.serialization.SerializerBuilder;
import br.com.caelum.vraptor.serialization.xstream.Serializee;
import br.com.caelum.vraptor.view.ResultException;
import com.google.gson.ExclusionStrategy;
/**
* Gson implementation for JSONSerialization
*
* @author Renan Reis
* @author Guilherme Mangabeira
*/
@Component
public class GsonJSONSerialization implements JSONSerialization {
protected final HttpServletResponse response;
protected final TypeNameExtractor extractor;
protected final ProxyInitializer initializer;
protected final VraptorGsonBuilder builder;
protected final Serializee serializee;
public GsonJSONSerialization(HttpServletResponse response, TypeNameExtractor extractor,
ProxyInitializer initializer, JsonSerializers serializers) {
this.response = response;
this.extractor = extractor;
this.initializer = initializer;
this.serializee = new Serializee();
ExclusionStrategy exclusion = new Exclusions(serializee);
this.builder = new VraptorGsonBuilder(serializers.getSerializers(), Arrays.asList(exclusion));
}
public boolean accepts(String format) {
return "json".equals(format);
}
public <T> Serializer from(T object) {
return from(object, null);
}
public <T> Serializer from(T object, String alias) {
response.setContentType("application/json");
return getSerializer().from(object, alias);
}
protected SerializerBuilder getSerializer() {
try {
return new GsonSerializer(builder, response.getWriter(), extractor, initializer, serializee);
} catch (IOException e) {
throw new ResultException("Unable to serialize data", e);
}
}
/**
* You can override this method for configuring Driver before serialization
*/
public <T> NoRootSerialization withoutRoot() {
builder.setWithoutRoot(true);
return this;
}
public JSONSerialization indented() {
builder.indented();
return this;
}
}