1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * https://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, 13 * software distributed under the License is distributed on an 14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 15 * KIND, either express or implied. See the License for the 16 * specific language governing permissions and limitations 17 * under the License. 18 */ 19 package org.apache.commons.compress.harmony.unpack200.bytecode; 20 21 import java.io.DataOutputStream; 22 import java.io.IOException; 23 24 /** 25 * Abstracts constant pool entries. 26 */ 27 public abstract class ConstantPoolEntry extends ClassFileEntry { 28 29 /** 30 * The constant {@value} for a constant pool class. 31 */ 32 public static final byte CP_Class = 7; 33 34 /** 35 * The constant {@value} for a constant pool double. 36 */ 37 public static final byte CP_Double = 6; 38 39 /** 40 * The constant {@value} for a constant pool field reference. 41 */ 42 public static final byte CP_Fieldref = 9; 43 44 /** 45 * The constant {@value} for a constant pool float. 46 */ 47 public static final byte CP_Float = 4; 48 49 /** 50 * The constant {@value} for a constant pool int. 51 */ 52 public static final byte CP_Integer = 3; 53 54 /* 55 * class MemberRef extends ConstantPoolEntry { private int index; Class(String name) { super(CP_Class); index = pool.indexOf(name); } void 56 * writeBody(DataOutputStream dos) throws IOException { dos.writeShort(index); } } 57 */ 58 59 /** 60 * The constant {@value} for a constant pool interface method reference. 61 */ 62 public static final byte CP_InterfaceMethodref = 11; 63 64 /** 65 * The constant {@value} for a constant pool long. 66 */ 67 public static final byte CP_Long = 5; 68 69 /** 70 * The constant {@value} for a constant pool method reference. 71 */ 72 public static final byte CP_Methodref = 10; 73 74 /** 75 * The constant {@value} for a constant pool name and type. 76 */ 77 public static final byte CP_NameAndType = 12; 78 79 /** 80 * The constant {@value} for a constant pool string. 81 */ 82 public static final byte CP_String = 8; 83 84 /** 85 * The constant {@value} for a constant pool UTF8. 86 */ 87 public static final byte CP_UTF8 = 1; 88 89 /** 90 * One-byte tag indicates the kind of constant. 91 */ 92 byte tag; 93 94 /** 95 * Global index. 96 */ 97 protected int globalIndex; 98 99 /** 100 * Constructs a new instance. 101 * 102 * @param tag One-byte tag indicates the kind of constant. 103 * @param globalIndex Global index. 104 */ 105 ConstantPoolEntry(final byte tag, final int globalIndex) { 106 this.tag = tag; 107 this.globalIndex = globalIndex; 108 } 109 110 @Override 111 public void doWrite(final DataOutputStream dos) throws IOException { 112 dos.writeByte(tag); 113 writeBody(dos); 114 } 115 116 @Override 117 public abstract boolean equals(Object obj); 118 119 /** 120 * Gets the global index. 121 * 122 * @return the global index. 123 */ 124 public int getGlobalIndex() { 125 return globalIndex; 126 } 127 128 /** 129 * Gets the tag. 130 131 * @return the tag. 132 */ 133 public byte getTag() { 134 return tag; 135 } 136 137 @Override 138 public abstract int hashCode(); 139 140 /** 141 * Writes this instance to the given output stream. 142 * 143 * @param dos the output stream. 144 * @throws IOException if an I/O error occurs. 145 */ 146 protected abstract void writeBody(DataOutputStream dos) throws IOException; 147 }