content: /*
   * 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.chemistry.opencmis.commons.impl.json;
  
  import java.io.IOException;
  import java.io.Writer;
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  /**
   * A JSON object. Key value pairs are order by insertion. JSONObject supports
   * java.util.Map interface.
   * 
   * (Taken from JSON.simple &lt;http://code.google.com/p/json-simple/&gt; and
   * modified for OpenCMIS.)
   * 
   * @author FangYidong&lt;fangyidong@yahoo.com.cn&gt;
   */
  public class JSONObject extends LinkedHashMap<String, Object> implements Map<String, Object>, JSONAware,
          JSONStreamAware {
  
      private static final long serialVersionUID = 1;
  
      @Override
      public Object put(String key, Object value) {
          if (key == null) {
              throw new IllegalArgumentException("JSON key must not be null!");
          }
  
          return super.put(key, value);
      }
  
      /**
       * Encode a map into JSON text and write it to out. If this map is also a
       * JSONAware or JSONStreamAware, JSONAware or JSONStreamAware specific
       * behaviours will be ignored at this top level.
       * 
       * @see JSONValue#writeJSONString(Object, Writer)
       * 
       * @param map
       * @param out
       */
      public static void writeJSONString(Map<String, Object> map, Writer out) throws IOException {
          if (map == null) {
              out.write("null");
              return;
          }
  
          boolean first = true;
  
          out.write('{');
          for (Map.Entry<String, Object> entry : map.entrySet()) {
              if (first) {
                  first = false;
              } else {
                  out.write(',');
              }
  
              out.write('\"');
              if (entry.getKey() == null) {
                  out.write("null");
              } else {
                  out.write(escape(entry.getKey()));
              }
              out.write('\"');
              out.write(':');
              JSONValue.writeJSONString(entry.getValue(), out);
          }
          out.write('}');
      }
  
      @Override
      public void writeJSONString(Writer out) throws IOException {
          writeJSONString(this, out);
      }
  
      /**
       * Convert a map to JSON text. The result is a JSON object. If this map is
       * also a JSONAware, JSONAware specific behaviours will be omitted at this
       * top level.
       * 
       * @see JSONValue#toJSONString(Object)
       * 
       * @param map
       * @return JSON text, or "null" if map is null.
       */
      public static String toJSONString(Map<String, Object> map) {
          if (map == null) {
              return "null";
          }
  
          StringBuilder sb = new StringBuilder(1024);
          addJSONString(map, sb);
          return sb.toString();
      }
  
      public static void addJSONString(Map<String, Object> map, StringBuilder sb) {
          if (map == null) {
              sb.append("null");
              return;
          }
  
          boolean first = true;
  
          sb.append('{');
          for (Map.Entry<String, Object> entry : map.entrySet()) {
              if (first) {
                  first = false;
              } else {
                  sb.append(',');
              }
  
              addJSONString(entry.getKey(), entry.getValue(), sb);
          }
          sb.append('}');
      }
  
      @Override
      public String toJSONString() {
          return toJSONString(this);
      }
  
      private static void addJSONString(String key, Object value, StringBuilder sb) {
          sb.append('\"');
          if (key == null) {
              sb.append("null");
          } else {
              JSONValue.escape(key, sb);
          }
  
          sb.append('\"').append(':');
  
          sb.append(JSONValue.toJSONString(value));
      }
  
      @Override
      public String toString() {
          return toJSONString();
      }
  
      public static String toString(String key, Object value) {
          StringBuilder sb = new StringBuilder(1024);
          addJSONString(key, value, sb);
          return sb.toString();
      }
  
      /**
       * Escape quotes, \, /, \r, \n, \b, \f, \t and other control characters
       * (U+0000 through U+001F). It's the same as JSONValue.escape() only for
       * compatibility here.
       * 
       * @see JSONValue#escape(String)
       * 
       * @param s
       * @return
       */
      public static String escape(String s) {
          return JSONValue.escape(s);
      }
  }
  