1 /*
2 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package jdk.nashorn.internal.objects;
27
28 import static jdk.nashorn.internal.runtime.ECMAErrors.typeError;
29 import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED;
30 import static jdk.nashorn.internal.runtime.ScriptRuntime.sameValue;
31
32 import java.util.Objects;
33 import jdk.nashorn.internal.objects.annotations.Property;
34 import jdk.nashorn.internal.objects.annotations.ScriptClass;
35 import jdk.nashorn.internal.runtime.JSType;
36 import jdk.nashorn.internal.runtime.PropertyDescriptor;
37 import jdk.nashorn.internal.runtime.PropertyMap;
38 import jdk.nashorn.internal.runtime.ScriptFunction;
39 import jdk.nashorn.internal.runtime.ScriptObject;
40 import jdk.nashorn.internal.runtime.ScriptRuntime;
41
42 /**
43 * Accessor Property descriptor is used to represent attributes an object property
44 * that either has a getter or a setter.
45 *
46 * See ECMA 8.10 The Property Descriptor and Property Identifier Specification Types
47 *
48 */
49 @ScriptClass("AccessorPropertyDescriptor")
50 public final class AccessorPropertyDescriptor extends ScriptObject implements PropertyDescriptor {
51 /** is this property configurable? */
52 @Property
53 public Object configurable;
54
55 /** is this property enumerable? */
56 @Property
57 public Object enumerable;
58
59 /** getter for property */
60 @Property
61 public Object get;
62
63 /** setter for property */
64 @Property
65 public Object set;
66
67 // initialized by nasgen
68 private static PropertyMap $nasgenmap$;
69
70 static PropertyMap getInitialMap() {
71 return $nasgenmap$;
72 }
73
74 AccessorPropertyDescriptor(final boolean configurable, final boolean enumerable, final Object get, final Object set, final Global global) {
75 super(global.getObjectPrototype(), global.getAccessorPropertyDescriptorMap());
76 this.configurable = configurable;
77 this.enumerable = enumerable;
78 this.get = get;
79 this.set = set;
80 }
81
82 @Override
83 public boolean isConfigurable() {
84 return JSType.toBoolean(configurable);
85 }
86
87 @Override
88 public boolean isEnumerable() {
89 return JSType.toBoolean(enumerable);
90 }
91
92 @Override
93 public boolean isWritable() {
94 // Not applicable for this. But simplifies flag calculations.
95 return true;
96 }
97
98 @Override
99 public Object getValue() {
100 throw new UnsupportedOperationException("value");
101 }
102
103 @Override
104 public ScriptFunction getGetter() {
105 return (get instanceof ScriptFunction) ? (ScriptFunction)get : null;
106 }
107
108 @Override
109 public ScriptFunction getSetter() {
110 return (set instanceof ScriptFunction) ? (ScriptFunction)set : null;
111 }
112
113 @Override
114 public void setConfigurable(final boolean flag) {
115 this.configurable = flag;
116 }
117
118 @Override
119 public void setEnumerable(final boolean flag) {
120 this.enumerable = flag;
121 }
122
123 @Override
124 public void setWritable(final boolean flag) {
125 throw new UnsupportedOperationException("set writable");
126 }
127
128 @Override
129 public void setValue(final Object value) {
130 throw new UnsupportedOperationException("set value");
131 }
132
133 @Override
134 public void setGetter(final Object getter) {
135 this.get = getter;
136 }
137
138 @Override
139 public void setSetter(final Object setter) {
140 this.set = setter;
141 }
142
143 @Override
144 public PropertyDescriptor fillFrom(final ScriptObject sobj) {
145 if (sobj.has(CONFIGURABLE)) {
146 this.configurable = JSType.toBoolean(sobj.get(CONFIGURABLE));
147 } else {
148 delete(CONFIGURABLE, false);
149 }
150
151 if (sobj.has(ENUMERABLE)) {
152 this.enumerable = JSType.toBoolean(sobj.get(ENUMERABLE));
153 } else {
154 delete(ENUMERABLE, false);
155 }
156
157 if (sobj.has(GET)) {
158 final Object getter = sobj.get(GET);
159 if (getter == UNDEFINED || getter instanceof ScriptFunction) {
160 this.get = getter;
161 } else {
162 throw typeError("not.a.function", ScriptRuntime.safeToString(getter));
163 }
164 } else {
165 delete(GET, false);
166 }
167
168 if (sobj.has(SET)) {
169 final Object setter = sobj.get(SET);
170 if (setter == UNDEFINED || setter instanceof ScriptFunction) {
171 this.set = setter;
172 } else {
173 throw typeError("not.a.function", ScriptRuntime.safeToString(setter));
174 }
175 } else {
176 delete(SET, false);
177 }
178
179 return this;
180 }
181
182 @Override
183 public int type() {
184 return ACCESSOR;
185 }
186
187 @Override
188 public boolean equals(final Object obj) {
189 if (this == obj) {
190 return true;
191 }
192 if (! (obj instanceof AccessorPropertyDescriptor)) {
193 return false;
194 }
195
196 final AccessorPropertyDescriptor other = (AccessorPropertyDescriptor)obj;
197 return sameValue(configurable, other.configurable) &&
198 sameValue(enumerable, other.enumerable) &&
199 sameValue(get, other.get) &&
200 sameValue(set, other.set);
201 }
202
203 @Override
204 public int hashCode() {
205 int hash = 7;
206 hash = 41 * hash + Objects.hashCode(this.configurable);
207 hash = 41 * hash + Objects.hashCode(this.enumerable);
208 hash = 41 * hash + Objects.hashCode(this.get);
209 hash = 41 * hash + Objects.hashCode(this.set);
210 return hash;
211 }
212 }