1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 */
24
25 /*
26 * This file is available under and governed by the GNU General Public
27 * License version 2 only, as published by the Free Software Foundation.
28 * However, the following notice accompanied the original version of this
29 * file:
30 *
31 * ASM: a very small and fast Java bytecode manipulation framework
32 * Copyright (c) 2000-2011 INRIA, France Telecom
33 * All rights reserved.
34 *
35 * Redistribution and use in source and binary forms, with or without
36 * modification, are permitted provided that the following conditions
37 * are met:
38 * 1. Redistributions of source code must retain the above copyright
39 * notice, this list of conditions and the following disclaimer.
40 * 2. Redistributions in binary form must reproduce the above copyright
41 * notice, this list of conditions and the following disclaimer in the
42 * documentation and/or other materials provided with the distribution.
43 * 3. Neither the name of the copyright holders nor the names of its
44 * contributors may be used to endorse or promote products derived from
45 * this software without specific prior written permission.
46 *
47 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
48 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
49 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
51 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
52 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
53 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
54 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
55 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
56 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
57 * THE POSSIBILITY OF SUCH DAMAGE.
58 */
59
60 package jdk.internal.org.objectweb.asm;
61
62 /**
63 * A reference to a field or a method.
64 *
65 * @author Remi Forax
66 * @author Eric Bruneton
67 */
68 public final class Handle {
69
70 /**
71 * The kind of field or method designated by this Handle. Should be
72 * {@link Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC},
73 * {@link Opcodes#H_PUTFIELD}, {@link Opcodes#H_PUTSTATIC},
74 * {@link Opcodes#H_INVOKEVIRTUAL}, {@link Opcodes#H_INVOKESTATIC},
75 * {@link Opcodes#H_INVOKESPECIAL}, {@link Opcodes#H_NEWINVOKESPECIAL} or
76 * {@link Opcodes#H_INVOKEINTERFACE}.
77 */
78 final int tag;
79
80 /**
81 * The internal name of the class that owns the field or method designated
82 * by this handle.
83 */
84 final String owner;
85
86 /**
87 * The name of the field or method designated by this handle.
88 */
89 final String name;
90
91 /**
92 * The descriptor of the field or method designated by this handle.
93 */
94 final String desc;
95
96 /**
97 * Constructs a new field or method handle.
98 *
99 * @param tag
100 * the kind of field or method designated by this Handle. Must be
101 * {@link Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC},
102 * {@link Opcodes#H_PUTFIELD}, {@link Opcodes#H_PUTSTATIC},
103 * {@link Opcodes#H_INVOKEVIRTUAL},
104 * {@link Opcodes#H_INVOKESTATIC},
105 * {@link Opcodes#H_INVOKESPECIAL},
106 * {@link Opcodes#H_NEWINVOKESPECIAL} or
107 * {@link Opcodes#H_INVOKEINTERFACE}.
108 * @param owner
109 * the internal name of the class that owns the field or method
110 * designated by this handle.
111 * @param name
112 * the name of the field or method designated by this handle.
113 * @param desc
114 * the descriptor of the field or method designated by this
115 * handle.
116 */
117 public Handle(int tag, String owner, String name, String desc) {
118 this.tag = tag;
119 this.owner = owner;
120 this.name = name;
121 this.desc = desc;
122 }
123
124 /**
125 * Returns the kind of field or method designated by this handle.
126 *
127 * @return {@link Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC},
128 * {@link Opcodes#H_PUTFIELD}, {@link Opcodes#H_PUTSTATIC},
129 * {@link Opcodes#H_INVOKEVIRTUAL}, {@link Opcodes#H_INVOKESTATIC},
130 * {@link Opcodes#H_INVOKESPECIAL},
131 * {@link Opcodes#H_NEWINVOKESPECIAL} or
132 * {@link Opcodes#H_INVOKEINTERFACE}.
133 */
134 public int getTag() {
135 return tag;
136 }
137
138 /**
139 * Returns the internal name of the class that owns the field or method
140 * designated by this handle.
141 *
142 * @return the internal name of the class that owns the field or method
143 * designated by this handle.
144 */
145 public String getOwner() {
146 return owner;
147 }
148
149 /**
150 * Returns the name of the field or method designated by this handle.
151 *
152 * @return the name of the field or method designated by this handle.
153 */
154 public String getName() {
155 return name;
156 }
157
158 /**
159 * Returns the descriptor of the field or method designated by this handle.
160 *
161 * @return the descriptor of the field or method designated by this handle.
162 */
163 public String getDesc() {
164 return desc;
165 }
166
167 @Override
168 public boolean equals(Object obj) {
169 if (obj == this) {
170 return true;
171 }
172 if (!(obj instanceof Handle)) {
173 return false;
174 }
175 Handle h = (Handle) obj;
176 return tag == h.tag && owner.equals(h.owner) && name.equals(h.name)
177 && desc.equals(h.desc);
178 }
179
180 @Override
181 public int hashCode() {
182 return tag + owner.hashCode() * name.hashCode() * desc.hashCode();
183 }
184
185 /**
186 * Returns the textual representation of this handle. The textual
187 * representation is:
188 *
189 * <pre>
190 * owner '.' name desc ' ' '(' tag ')'
191 * </pre>
192 *
193 * . As this format is unambiguous, it can be parsed if necessary.
194 */
195 @Override
196 public String toString() {
197 return owner + '.' + name + desc + " (" + tag + ')';
198 }
199 }