001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * https://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.commons.compress.harmony.unpack200.bytecode; 020 021import java.io.DataOutputStream; 022import java.io.IOException; 023import java.util.Objects; 024 025import org.apache.commons.compress.harmony.unpack200.SegmentUtils; 026 027/** 028 * Name and Type pair constant pool entry. 029 */ 030public class CPNameAndType extends ConstantPoolEntry { 031 032 CPUTF8 descriptor; 033 034 transient int descriptorIndex; 035 036 CPUTF8 name; 037 038 transient int nameIndex; 039 040 private boolean hashCodeComputed; 041 042 private int cachedHashCode; 043 044 /** 045 * Constructs a new CPNameAndType. 046 * 047 * @param name TODO 048 * @param descriptor TODO 049 * @param globalIndex index in CpBands 050 * @throws NullPointerException if name or descriptor is null 051 */ 052 public CPNameAndType(final CPUTF8 name, final CPUTF8 descriptor, final int globalIndex) { 053 super(CP_NameAndType, globalIndex); 054 this.name = Objects.requireNonNull(name, "name"); 055 this.descriptor = Objects.requireNonNull(descriptor, "descriptor"); 056 } 057 058 /* 059 * field_info { u2 access_flags; u2 name_index; u2 descriptor_index; u2 attributes_count; attribute_info attributes[attributes_count]; } 060 */ 061 062 @Override 063 public boolean equals(final Object obj) { 064 if (this == obj) { 065 return true; 066 } 067 if (obj == null || getClass() != obj.getClass()) { 068 return false; 069 } 070 final CPNameAndType other = (CPNameAndType) obj; 071 return Objects.equals(descriptor, other.descriptor) 072 && Objects.equals(name, other.name); 073 } 074 075 private void generateHashCode() { 076 hashCodeComputed = true; 077 final int PRIME = 31; 078 int result = 1; 079 result = PRIME * result + descriptor.hashCode(); 080 result = PRIME * result + name.hashCode(); 081 cachedHashCode = result; 082 } 083 084 @Override 085 protected ClassFileEntry[] getNestedClassFileEntries() { 086 return new ClassFileEntry[] { name, descriptor }; 087 } 088 089 @Override 090 public int hashCode() { 091 if (!hashCodeComputed) { 092 generateHashCode(); 093 } 094 return cachedHashCode; 095 } 096 097 /** 098 * Answers the invokeinterface count argument when the receiver is treated as an invokeinterface target. This value is not meaningful if the receiver is not 099 * an invokeinterface target. 100 * 101 * @return count 102 */ 103 public int invokeInterfaceCount() { 104 return 1 + SegmentUtils.countInvokeInterfaceArgs(descriptor.underlyingString()); 105 } 106 107 @Override 108 protected void resolve(final ClassConstantPool pool) { 109 super.resolve(pool); 110 descriptorIndex = pool.indexOf(descriptor); 111 nameIndex = pool.indexOf(name); 112 } 113 114 @Override 115 public String toString() { 116 return "NameAndType: " + name + "(" + descriptor + ")"; 117 } 118 119 @Override 120 protected void writeBody(final DataOutputStream dos) throws IOException { 121 dos.writeShort(nameIndex); 122 dos.writeShort(descriptorIndex); 123 } 124}