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/*
 * Copyright 2011-2015 PrimeFaces Extensions
 *
 * 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.
 *
 * $Id$
 */

package org.primefaces.extensions.util.json;

import java.util.Date;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

/**
 * Singleton instance of Gson which exludes fields without @Expose annotation.
 *
 * @author  Oleg Varaksin / last modified by $Author$
 * @version $Revision$
 * @since   1.1.0
 */
public final class GsonExposeAwareConverter {

	private static final GsonExposeAwareConverter INSTANCE = new GsonExposeAwareConverter();
	private Gson gson;

	private GsonExposeAwareConverter() {
		GsonBuilder gsonBilder = new GsonBuilder();

		gsonBilder.registerTypeAdapter(Date.class, new DateTypeAdapter());
		gsonBilder.serializeNulls();
		gsonBilder.excludeFieldsWithoutExposeAnnotation();

		gson = gsonBilder.create();
	}

	public static Gson getGson() {
		return INSTANCE.gson;
	}
}