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JSONArray xref 

1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   * http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing,
13   * software distributed under the License is distributed on an
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   * KIND, either express or implied.  See the License for the
16   * specific language governing permissions and limitations
17   * under the License.
18   */
19  package org.apache.chemistry.opencmis.commons.impl.json;
20  
21  import java.io.IOException;
22  import java.io.Writer;
23  import java.util.ArrayList;
24  import java.util.List;
25  
26  /**
27   * A JSON array. JSONObject supports java.util.List interface.
28   * 
29   * (Taken from JSON.simple <http://code.google.com/p/json-simple/> and modified
30   * for OpenCMIS.)
31   * 
32   * @author FangYidong<fangyidong@yahoo.com.cn>
33   */
34  public class JSONArray extends ArrayList<Object> implements List<Object>, JSONAware, JSONStreamAware {
35      private static final long serialVersionUID = 3957988303675231981L;
36  
37      /**
38       * Encode a list into JSON text and write it to out. If this list is also a
39       * JSONStreamAware or a JSONAware, JSONStreamAware and JSONAware specific
40       * behaviours will be ignored at this top level.
41       * 
42       * @see org.json.simple.JSONValue#writeJSONString(Object, Writer)
43       * 
44       * @param list
45       * @param out
46       */
47      public static void writeJSONString(List<Object> list, Writer out) throws IOException {
48          if (list == null) {
49              out.write("null");
50              return;
51          }
52  
53          boolean first = true;
54  
55          out.write('[');
56          for (Object value : list) {
57              if (first) {
58                  first = false;
59              } else {
60                  out.write(',');
61              }
62  
63              if (value == null) {
64                  out.write("null");
65                  continue;
66              }
67  
68              JSONValue.writeJSONString(value, out);
69          }
70          out.write(']');
71      }
72  
73      public void writeJSONString(Writer out) throws IOException {
74          writeJSONString(this, out);
75      }
76  
77      /**
78       * Convert a list to JSON text. The result is a JSON array. If this list is
79       * also a JSONAware, JSONAware specific behaviours will be omitted at this
80       * top level.
81       * 
82       * @see org.json.simple.JSONValue#toJSONString(Object)
83       * 
84       * @param list
85       * @return JSON text, or "null" if list is null.
86       */
87      public static String toJSONString(List<Object> list) {
88          if (list == null) {
89              return "null";
90          }
91  
92          boolean first = true;
93          StringBuilder sb = new StringBuilder();
94  
95          sb.append('[');
96          for (Object value : list) {
97              if (first) {
98                  first = false;
99              } else {
100                 sb.append(',');
101             }
102 
103             if (value == null) {
104                 sb.append("null");
105                 continue;
106             }
107             sb.append(JSONValue.toJSONString(value));
108         }
109         sb.append(']');
110         return sb.toString();
111     }
112 
113     public String toJSONString() {
114         return toJSONString(this);
115     }
116 
117     public String toString() {
118         return toJSONString();
119     }
120 }