text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.usergrid.chop.webapp.service.util;
  
  import org.apache.commons.lang.StringUtils;
  import org.json.JSONArray;
  import org.json.JSONException;
  import org.json.JSONObject;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.List;
  
  public class JsonUtil {
  
      private static Logger LOG = LoggerFactory.getLogger(JsonUtil.class);
  
      public static void put(JSONObject json, String key, Object value) {
          try {
              json.put(key, value);
          } catch (JSONException e) {
              LOG.error("Exception while put to json: ", e);
          }
      }
  
      public static void inc(JSONObject json, String key, long incValue) {
          try {
              long value = json.optLong(key) + incValue;
              json.put(key, value);
          } catch (JSONException e) {
              LOG.error("Exception while inc json: ", e);
          }
      }
  
      public static void copy(JSONObject src, JSONObject dest) {
          Iterator iter = src.keys();
  
          try {
              while (iter.hasNext()) {
                  String key = (String) iter.next();
                  put(dest, key, src.get(key));
              }
          } catch (JSONException e) {
              LOG.error("Exception while copying json: ", e);
          }
      }
  
      public static void copy(JSONObject src, JSONObject dest, String key) {
          Object value = src.opt(key);
  
          if (value != null) {
              put(dest, key, value);
          }
      }
  
      public static List<String> getKeys(JSONObject json) {
  
          ArrayList<String> keys = new ArrayList<String>();
          Iterator iter = json.keys();
  
          while (iter.hasNext()) {
              keys.add((String) iter.next());
          }
  
          return keys;
      }
  
      public static JSONArray parseArray(String s) {
  
          JSONArray arr = new JSONArray();
  
          if (StringUtils.isEmpty(s)) {
              return arr;
          }
  
          try {
              arr = new JSONArray(s);
          } catch (JSONException e) {
              LOG.error("Exception while parsing string to json: ", e);
          }
  
          return arr;
      }
  
      public static JSONObject get(JSONArray arr, int i) {
  
          JSONObject json = null;
  
          try {
              json = arr.getJSONObject(i);
          } catch (JSONException e) {
              LOG.error("Exception while getting element from json array: ", e);
          }
  
          return json;
      }
  
  }
  