source: josm/trunk/src/javax/json/EmptyObject.java@ 13611

Last change on this file since 13611 was 13231, checked in by Don-vip, 7 years ago

see #15682 - upgrade to JSR 374 (JSON Processing) API 1.1.2

File size: 3.8 KB
Line 
1/*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
5 *
6 * The contents of this file are subject to the terms of either the GNU
7 * General Public License Version 2 only ("GPL") or the Common Development
8 * and Distribution License("CDDL") (collectively, the "License"). You
9 * may not use this file except in compliance with the License. You can
10 * obtain a copy of the License at
11 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
12 * or LICENSE.txt. See the License for the specific
13 * language governing permissions and limitations under the License.
14 *
15 * When distributing the software, include this License Header Notice in each
16 * file and include the License file at LICENSE.txt.
17 *
18 * GPL Classpath Exception:
19 * Oracle designates this particular file as subject to the "Classpath"
20 * exception as provided by Oracle in the GPL Version 2 section of the License
21 * file that accompanied this code.
22 *
23 * Modifications:
24 * If applicable, add the following below the License Header, with the fields
25 * enclosed by brackets [] replaced by your own identifying information:
26 * "Portions Copyright [year] [name of copyright owner]"
27 *
28 * Contributor(s):
29 * If you wish your version of this file to be governed by only the CDDL or
30 * only the GPL Version 2, indicate your decision by adding "[Contributor]
31 * elects to include this software in this distribution under the [CDDL or GPL
32 * Version 2] license." If you don't indicate a single choice of license, a
33 * recipient has the option to distribute your version of this file under
34 * either the CDDL, the GPL Version 2 or to extend the choice of license to
35 * its licensees as provided above. However, if you add GPL Version 2 code
36 * and therefore, elected the GPL Version 2 license, then the option applies
37 * only if the new code is made subject to such option by the copyright
38 * holder.
39 */
40
41package javax.json;
42
43import java.io.Serializable;
44import java.util.AbstractMap;
45import java.util.Collections;
46import java.util.Set;
47
48/**
49 * Private implementation of immutable {@link JsonObject}.
50 *
51 * @author Lukas Jungmann
52 */
53final class EmptyObject extends AbstractMap<String, JsonValue> implements JsonObject, Serializable {
54
55 private static final long serialVersionUID = -1461653546889072583L;
56
57 @Override
58 public Set<Entry<String, JsonValue>> entrySet() {
59 return Collections.<Entry<String, JsonValue>>emptySet();
60 }
61
62 @Override
63 public JsonArray getJsonArray(String name) {
64 return (JsonArray) get(name);
65 }
66
67 @Override
68 public JsonObject getJsonObject(String name) {
69 return (JsonObject) get(name);
70 }
71
72 @Override
73 public JsonNumber getJsonNumber(String name) {
74 return (JsonNumber) get(name);
75 }
76
77 @Override
78 public JsonString getJsonString(String name) {
79 return (JsonString) get(name);
80 }
81
82 @Override
83 public String getString(String name) {
84 return getJsonString(name).getString();
85 }
86
87 @Override
88 public String getString(String name, String defaultValue) {
89 return defaultValue;
90 }
91
92 @Override
93 public int getInt(String name) {
94 return getJsonNumber(name).intValue();
95 }
96
97 @Override
98 public int getInt(String name, int defaultValue) {
99 return defaultValue;
100 }
101
102 @Override
103 public boolean getBoolean(String name) {
104 throw new NullPointerException();
105 }
106
107 @Override
108 public boolean getBoolean(String name, boolean defaultValue) {
109 return defaultValue;
110 }
111
112 @Override
113 public boolean isNull(String name) {
114 throw new NullPointerException();
115 }
116
117 @Override
118 public ValueType getValueType() {
119 return ValueType.OBJECT;
120 }
121
122 // Preserves singleton property
123 private Object readResolve() {
124 return JsonValue.EMPTY_JSON_OBJECT;
125 }
126}
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