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 022import org.apache.commons.compress.harmony.unpack200.SegmentUtils; 023 024/** 025 * Name and Type pair constant pool entry. 026 */ 027public class CPNameAndType extends ConstantPoolEntry { 028 029 CPUTF8 descriptor; 030 031 transient int descriptorIndex; 032 033 CPUTF8 name; 034 035 transient int nameIndex; 036 037 /** 038 * Create a new CPNameAndType 039 * 040 * @param name TODO 041 * @param descriptor TODO 042 * @param globalIndex - index in CpBands 043 * @throws NullPointerException if name or descriptor is null 044 */ 045 public CPNameAndType(final CPUTF8 name, final CPUTF8 descriptor, final int globalIndex) { 046 super(ConstantPoolEntry.CP_NameAndType, globalIndex); 047 this.name = name; 048 this.descriptor = descriptor; 049 if (name == null || descriptor == null) { 050 throw new NullPointerException("Null arguments are not allowed"); 051 } 052 } 053 054 @Override 055 protected ClassFileEntry[] getNestedClassFileEntries() { 056 return new ClassFileEntry[] {name, descriptor}; 057 } 058 059 @Override 060 protected void resolve(final ClassConstantPool pool) { 061 super.resolve(pool); 062 descriptorIndex = pool.indexOf(descriptor); 063 nameIndex = pool.indexOf(name); 064 } 065 066 /* 067 * field_info { u2 access_flags; u2 name_index; u2 descriptor_index; u2 attributes_count; attribute_info 068 * attributes[attributes_count]; } 069 */ 070 071 @Override 072 protected void writeBody(final DataOutputStream dos) throws IOException { 073 dos.writeShort(nameIndex); 074 dos.writeShort(descriptorIndex); 075 } 076 077 @Override 078 public String toString() { 079 return "NameAndType: " + name + "(" + descriptor + ")"; 080 } 081 082 private boolean hashcodeComputed; 083 private int cachedHashCode; 084 085 private void generateHashCode() { 086 hashcodeComputed = true; 087 final int PRIME = 31; 088 int result = 1; 089 result = PRIME * result + descriptor.hashCode(); 090 result = PRIME * result + name.hashCode(); 091 cachedHashCode = result; 092 } 093 094 @Override 095 public int hashCode() { 096 if (!hashcodeComputed) { 097 generateHashCode(); 098 } 099 return cachedHashCode; 100 } 101 102 @Override 103 public boolean equals(final Object obj) { 104 if (this == obj) { 105 return true; 106 } 107 if (obj == null) { 108 return false; 109 } 110 if (getClass() != obj.getClass()) { 111 return false; 112 } 113 final CPNameAndType other = (CPNameAndType) obj; 114 if (!descriptor.equals(other.descriptor)) { 115 return false; 116 } 117 if (!name.equals(other.name)) { 118 return false; 119 } 120 return true; 121 } 122 123 /** 124 * Answers the invokeinterface count argument when the receiver is treated as an invokeinterface target. This value 125 * is not meaningful if the receiver is not an invokeinterface target. 126 * 127 * @return count 128 */ 129 public int invokeInterfaceCount() { 130 return 1 + SegmentUtils.countInvokeInterfaceArgs(descriptor.underlyingString()); 131 } 132}