Package br.com.caelum.vraptor.serialization.gson

Source Code of br.com.caelum.vraptor.serialization.gson.GsonJSONSerialization

/***
* 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 javax.enterprise.context.RequestScoped;
import javax.inject.Inject;
import javax.servlet.http.HttpServletResponse;

import br.com.caelum.vraptor.interceptor.TypeNameExtractor;
import br.com.caelum.vraptor.rest.gson.GsonSerializerBuilder;
import br.com.caelum.vraptor.serialization.JSONSerialization;
import br.com.caelum.vraptor.serialization.NoRootSerialization;
import br.com.caelum.vraptor.serialization.Serializer;
import br.com.caelum.vraptor.serialization.SerializerBuilder;
import br.com.caelum.vraptor.view.ResultException;

/**
* Gson implementation for JSONSerialization
*
* @author Renan Reis
* @author Guilherme Mangabeira
*/
@RequestScoped
public class GsonJSONSerialization implements JSONSerialization {

  private final HttpServletResponse response;
  private final TypeNameExtractor extractor;
  private final GsonSerializerBuilder builder;

  /**
   * @deprecated CDI eyes only
   */
  protected GsonJSONSerialization() {
    this(null, null, null);
  }

  @Inject
  public GsonJSONSerialization(HttpServletResponse response, TypeNameExtractor extractor,
      GsonSerializerBuilder builder) {
    this.response = response;
    this.extractor = extractor;
    this.builder = builder;
  }

  @Override
  public boolean accepts(String format) {
    return "json".equals(format);
  }

  @Override
  public <T> Serializer from(T object) {
    return from(object, null);
  }

  @Override
  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);
    } catch (IOException e) {
      throw new ResultException("Unable to serialize data", e);
    }
  }

  /**
   * You can override this method for configuring Driver before serialization
   */
  @Override
  public <T> NoRootSerialization withoutRoot() {
    builder.setWithoutRoot(true);
    return this;
  }

  @Override
  public JSONSerialization indented() {
    builder.indented();
    return this;
  }
}
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