/*******************************************************************************
 * Copyright 2016-2017 ZTE, Inc. and others.
 * 
 * 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 org.onap.msb.apiroute.wrapper.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;


public class JacksonJsonUtil {

    private static final Logger logger = LoggerFactory.getLogger(JacksonJsonUtil.class);

    private volatile static ObjectMapper mapper = null;

    private static ObjectMapper getMapperInstance() {
        if (mapper == null) {
            synchronized (JacksonJsonUtil.class) {
                if (mapper == null) {
                    mapper = new ObjectMapper();
                }
            }
        }
        return mapper;
    }

    /**
     * from java object to json
     * 
     * @param obj
     * @return json
     * @throws Exception
     */
    public static String beanToJson(Object obj) throws Exception {
        String json = null;

        ObjectMapper objectMapper = getMapperInstance();
        objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        json = objectMapper.writeValueAsString(obj);

        return json;
    }



    /**
     * from json to java object
     * 
     * @param json
     * @param cls
     * @return
     * @throws Exception
     */
    public static Object jsonToBean(String json, Class<?> cls) throws Exception {
        Object vo = null;
        try {
            ObjectMapper objectMapper = getMapperInstance();
            objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
            vo = objectMapper.readValue(json, cls);

        } catch (Exception e) {
            logger.error(cls + " JsonTobean faild");
            throw new Exception(cls + " JsonTobean faild");
        }
        return vo;
    }

    /**
     * from json to java List
     * 
     * @param json
     * @return
     * @throws Exception
     */

    public static <T> T jsonToListBean(String json, TypeReference<T> valueTypeRef) {
        try {

            ObjectMapper objectMapper = getMapperInstance();


            return objectMapper.readValue(json, valueTypeRef);

        } catch (Exception e) {
            String errorMsg = " JsonTobean faild:" + e.getMessage();
            logger.error(errorMsg);
        }
        return null;
    }



}