001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.compress.harmony.unpack200.bytecode; 018 019import java.io.DataOutputStream; 020import java.io.IOException; 021 022/** 023 * Field reference constant pool entry. 024 */ 025public class CPFieldRef extends ConstantPoolEntry { 026 027 CPClass className; 028 transient int classNameIndex; 029 private final CPNameAndType nameAndType; 030 transient int nameAndTypeIndex; 031 032 public CPFieldRef(final CPClass className, final CPNameAndType descriptor, final int globalIndex) { 033 super(ConstantPoolEntry.CP_Fieldref, globalIndex); 034 this.className = className; 035 this.nameAndType = descriptor; 036 } 037 038 @Override 039 protected ClassFileEntry[] getNestedClassFileEntries() { 040 return new ClassFileEntry[] {className, nameAndType}; 041 } 042 043 @Override 044 protected void resolve(final ClassConstantPool pool) { 045 super.resolve(pool); 046 nameAndTypeIndex = pool.indexOf(nameAndType); 047 classNameIndex = pool.indexOf(className); 048 } 049 050 @Override 051 protected void writeBody(final DataOutputStream dos) throws IOException { 052 dos.writeShort(classNameIndex); 053 dos.writeShort(nameAndTypeIndex); 054 } 055 056 @Override 057 public String toString() { 058 return "FieldRef: " + className + "#" + nameAndType; 059 } 060 061 private boolean hashcodeComputed; 062 private int cachedHashCode; 063 064 private void generateHashCode() { 065 hashcodeComputed = true; 066 final int PRIME = 31; 067 int result = 1; 068 result = PRIME * result + ((className == null) ? 0 : className.hashCode()); 069 result = PRIME * result + ((nameAndType == null) ? 0 : nameAndType.hashCode()); 070 cachedHashCode = result; 071 } 072 073 @Override 074 public int hashCode() { 075 if (!hashcodeComputed) { 076 generateHashCode(); 077 } 078 return cachedHashCode; 079 } 080 081 @Override 082 public boolean equals(final Object obj) { 083 if (this == obj) { 084 return true; 085 } 086 if (obj == null) { 087 return false; 088 } 089 if (getClass() != obj.getClass()) { 090 return false; 091 } 092 final CPFieldRef other = (CPFieldRef) obj; 093 if (className == null) { 094 if (other.className != null) { 095 return false; 096 } 097 } else if (!className.equals(other.className)) { 098 return false; 099 } 100 if (nameAndType == null) { 101 if (other.nameAndType != null) { 102 return false; 103 } 104 } else if (!nameAndType.equals(other.nameAndType)) { 105 return false; 106 } 107 return true; 108 } 109 110}