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 field or method designed by this handle.
82 */
83 final String owner;
84
85 /**
86 * The name of the field or method designated by this handle.
87 */
88 final String name;
89
90 /**
91 * The descriptor of the field or method designated by this handle.
92 */
93 final String desc;
94
95 /**
96 * Constructs a new field or method handle.
97 *
98 * @param tag
99 * the kind of field or method designated by this Handle. Must be
100 * {@link Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC},
101 * {@link Opcodes#H_PUTFIELD}, {@link Opcodes#H_PUTSTATIC},
102 * {@link Opcodes#H_INVOKEVIRTUAL},
103 * {@link Opcodes#H_INVOKESTATIC},
104 * {@link Opcodes#H_INVOKESPECIAL},
105 * {@link Opcodes#H_NEWINVOKESPECIAL} or
106 * {@link Opcodes#H_INVOKEINTERFACE}.
107 * @param owner
108 * the internal name of the field or method designed by this
109 * handle.
110 * @param name
111 * the name of the field or method designated by this handle.
112 * @param desc
113 * the descriptor of the field or method designated by this
114 * handle.
115 */
116 public Handle(int tag, String owner, String name, String desc) {
117 this.tag = tag;
118 this.owner = owner;
119 this.name = name;
120 this.desc = desc;
121 }
122
123 /**
124 * Returns the kind of field or method designated by this handle.
125 *
126 * @return {@link Opcodes#H_GETFIELD}, {@link Opcodes#H_GETSTATIC},
127 * {@link Opcodes#H_PUTFIELD}, {@link Opcodes#H_PUTSTATIC},
128 * {@link Opcodes#H_INVOKEVIRTUAL}, {@link Opcodes#H_INVOKESTATIC},
129 * {@link Opcodes#H_INVOKESPECIAL},
130 * {@link Opcodes#H_NEWINVOKESPECIAL} or
131 * {@link Opcodes#H_INVOKEINTERFACE}.
132 */
133 public int getTag() {
134 return tag;
135 }
136
137 /**
138 * Returns the internal name of the field or method designed by this handle.
139 *
140 * @return the internal name of the field or method designed by this handle.
141 */
142 public String getOwner() {
143 return owner;
144 }
145
146 /**
147 * Returns the name of the field or method designated by this handle.
148 *
149 * @return the name of the field or method designated by this handle.
150 */
151 public String getName() {
152 return name;
153 }
154
155 /**
156 * Returns the descriptor of the field or method designated by this handle.
157 *
158 * @return the descriptor of the field or method designated by this handle.
159 */
160 public String getDesc() {
161 return desc;
162 }
163
164 @Override
165 public boolean equals(Object obj) {
166 if (obj == this) {
167 return true;
168 }
169 if (!(obj instanceof Handle)) {
170 return false;
171 }
172 Handle h = (Handle) obj;
173 return tag == h.tag && owner.equals(h.owner) && name.equals(h.name)
174 && desc.equals(h.desc);
175 }
176
177 @Override
178 public int hashCode() {
179 return tag + owner.hashCode() * name.hashCode() * desc.hashCode();
180 }
181
182 /**
183 * Returns the textual representation of this handle. The textual
184 * representation is:
185 *
186 * <pre>
187 * owner '.' name desc ' ' '(' tag ')'
188 * </pre>
189 *
190 * . As this format is unambiguous, it can be parsed if necessary.
191 */
192 @Override
193 public String toString() {
194 return owner + '.' + name + desc + " (" + tag + ')';
195 }
196 }