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Client library to use the IBM Watson Services and AlchemyAPI

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/**
 * Copyright 2015 IBM Corp. 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 com.ibm.watson.developer_cloud.util;

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

/**
 * The Class GsonSingleton.
 */
public class GsonSingleton {

	/** The Constant DATE_FORMAT_UTC. */
	private static final String DATE_FORMAT_UTC = "yyyy-MM-dd'T'HH:mm:ss.SSS";
	/** The gson. */
	private static Gson gson;
	
	/**
	 * Gets the gson.
	 *
	 * @return the gson
	 */
	public static Gson getGson() {
		if (gson == null) {
			gson = createGson();
		}
		return gson;
	}

	/**
	 * Creates a {@link com.google.gson.Gson} object that can be use to serialize 
	 * and deserialize Java objects}
	 *
	 * @return the gson
	 */
	private static Gson createGson() {
		return new GsonBuilder()
			.setPrettyPrinting()
			.setDateFormat(DATE_FORMAT_UTC)
			.create();
	};
}