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Java > Open Source Codes > com > google > gwt > json > client > JSONValue


1 /*
2  * Copyright 2006 Google Inc.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy of
6  * the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations under
14  * the License.
15  */
16 package com.google.gwt.json.client;
17
18 /**
19  * The superclass of all JSON value types.
20  *
21  * @see com.google.gwt.json.client.JSONArray
22  * @see com.google.gwt.json.client.JSONBoolean
23  * @see com.google.gwt.json.client.JSONNumber
24  * @see com.google.gwt.json.client.JSONObject
25  * @see com.google.gwt.json.client.JSONString
26  */
27 public abstract class JSONValue {
28   /**
29    * Returns a non-null reference if this JSONValue is really a JSONArray.
30    *
31    * @return a reference to a JSONArray if this JSONValue is a JSONArray or
32    * <code>null</code> otherwise.
33    */
34   public JSONArray isArray() {
35     return null;
36   }
37
38   /**
39    * Returns a non-null reference if this JSONValue is really a JSONBoolean.
40    *
41    * @return a reference to a JSONBoolean if this JSONValue is a JSONBoolean or
42    * <code>null</code> otherwise.
43    */
44   public JSONBoolean isBoolean() {
45     return null;
46   }
47
48   /**
49    * Returns a non-null reference if this JSONValue is really a JSONNull.
50    *
51    * @return a reference to a JSONNull if this JSONValue is a JSONNull or
52    * <code>null</code> otherwise.
53    */
54   public JSONNull isNull() {
55     return null;
56   }
57
58   /**
59    * Returns a non-null reference if this JSONValue is really a JSONNumber.
60    *
61    * @return a reference to a JSONNumber if this JSONValue is a JSONNumber or
62    * <code>null</code> otherwise.
63    */
64   public JSONNumber isNumber() {
65     return null;
66   }
67
68   /**
69    * Returns non-null if this JSONValue is really a JSONObject.
70    *
71    * @return a reference to a JSONObject if this JSONValue is a JSONObject or
72    * <code>null</code> otherwise.
73    */
74   public JSONObject isObject() {
75     return null;
76   }
77
78   /**
79    * Returns a non-null reference if this JSONValue is really a JSONString.
80    *
81    * @return a reference to a JSONString if this JSONValue is a JSONString or
82    * <code>null</code> otherwise.
83    */
84   public JSONString isString() {
85     return null;
86   }
87
88   /**
89    * Returns a JSON-encoded string for this entity. Use this method to create
90    * JSON strings that can be sent from the client to a server.
91    */
92   public abstract String JavaDoc toString() throws JSONException;
93 }
94
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