content: /*
   *   Copyright (C)  2016 android@19code.com
   *
   *   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.rsen.github.common;
  
  import com.google.gson.Gson;
  import com.google.gson.GsonBuilder;
  import com.google.gson.JsonDeserializationContext;
  import com.google.gson.JsonDeserializer;
  import com.google.gson.JsonElement;
  import com.google.gson.JsonParseException;
  import com.google.gson.JsonPrimitive;
  import com.google.gson.JsonSerializationContext;
  import com.google.gson.JsonSerializer;
  
  import java.lang.reflect.Type;
  import java.text.ParseException;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  import java.util.List;
  import java.util.Map;
  
  public class GsonUtil {
      private static Gson gson = null;
  
      static {
          if (gson == null) {
              gson = new Gson();
          }
      }
  
      public static String objectToJson(Object ts) {
          String jsonStr = null;
          if (gson != null) {
              jsonStr = gson.toJson(ts);
          }
          return jsonStr;
      }
  
  
      public static String objectToJson(Object ts, Type type) {
          String jsonStr = null;
          if (gson != null) {
              jsonStr = gson.toJson(ts, type);
          }
          return jsonStr;
      }
  
  
      public static String objectToJsonDateSerializer(Object ts, final String dateformat) {
          String jsonStr = null;
          gson = new GsonBuilder()
                  .registerTypeHierarchyAdapter(Date.class,
                          new JsonSerializer<Date>() {
                              public JsonElement serialize(Date src,
                                                           Type typeOfSrc,
                                                           JsonSerializationContext context) {
                                  SimpleDateFormat format = new SimpleDateFormat(dateformat);
                                  return new JsonPrimitive(format.format(src));
                              }
                          }).setDateFormat(dateformat).create();
          if (gson != null) {
              jsonStr = gson.toJson(ts);
          }
          return jsonStr;
      }
  
  
      public static List<?> jsonToList(String jsonStr) {
          List<?> objList = null;
          if (gson != null) {
              Type type = new com.google.gson.reflect.TypeToken<List<?>>() {
              }.getType();
              objList = gson.fromJson(jsonStr, type);
          }
          return objList;
      }
  
  
      public static List<?> jsonToList(String jsonStr, Type type) {
          List<?> objList = null;
          if (gson != null) {
              objList = gson.fromJson(jsonStr, type);
          }
          return objList;
      }
  
  
      public static Map<?, ?> jsonToMap(String jsonStr) {
          Map<?, ?> objMap = null;
          if (gson != null) {
              Type type = new com.google.gson.reflect.TypeToken<Map<?, ?>>() {
              }.getType();
              objMap = gson.fromJson(jsonStr, type);
          }
          return objMap;
      }
  
      public static Object jsonToBean(String jsonStr, Class<?> cl) {
          Object obj = null;
          if (gson != null) {
              obj = gson.fromJson(jsonStr, cl);
          }
          return obj;
      }
  
  
      @SuppressWarnings("unchecked")
      public static <T> T jsonToBeanDateSerializer(String jsonStr, Class<T> cl,
                                                   final String pattern) {
          Object obj = null;
          gson = new GsonBuilder()
                  .registerTypeAdapter(Date.class, new JsonDeserializer<Date>() {
                      public Date deserialize(JsonElement json, Type typeOfT,
                                              JsonDeserializationContext context)
                              throws JsonParseException {
                          SimpleDateFormat format = new SimpleDateFormat(pattern);
                          String dateStr = json.getAsString();
                          try {
                              return format.parse(dateStr);
                          } catch (ParseException e) {
                              e.printStackTrace();
                          }
                          return null;
                      }
                  }).setDateFormat(pattern).create();
          if (gson != null) {
              obj = gson.fromJson(jsonStr, cl);
          }
          return (T) obj;
      }
  
  
      public static Object getJsonValue(String jsonStr, String key) {
          Object rulsObj = null;
          Map<?, ?> rulsMap = jsonToMap(jsonStr);
          if (rulsMap != null && rulsMap.size() > 0) {
              rulsObj = rulsMap.get(key);
          }
          return rulsObj;
      }
  }
  