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 }