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; 021import java.util.Objects; 022 023/** 024 * Constant pool entry for a class 025 */ 026public class CPClass extends ConstantPoolEntry { 027 028 private int index; 029 030 public String name; 031 032 private final CPUTF8 utf8; 033 034 private boolean hashCodeComputed; 035 036 private int cachedHashCode; 037 038 /** 039 * Creates a new CPClass 040 * 041 * @param name TODO 042 * @param globalIndex index in CpBands 043 * @throws NullPointerException if name is null 044 */ 045 public CPClass(final CPUTF8 name, final int globalIndex) { 046 super(ConstantPoolEntry.CP_Class, globalIndex); 047 this.name = Objects.requireNonNull(name, "name").underlyingString(); 048 this.utf8 = name; 049 } 050 051 @Override 052 public boolean equals(final Object obj) { 053 if (this == obj) { 054 return true; 055 } 056 if (obj == null) { 057 return false; 058 } 059 if (this.getClass() != obj.getClass()) { 060 return false; 061 } 062 final CPClass other = (CPClass) obj; 063 return utf8.equals(other.utf8); 064 } 065 private void generateHashCode() { 066 hashCodeComputed = true; 067 cachedHashCode = utf8.hashCode(); 068 } 069 070 public String getName() { 071 return name; 072 } 073 074 @Override 075 protected ClassFileEntry[] getNestedClassFileEntries() { 076 return new ClassFileEntry[] {utf8,}; 077 } 078 079 @Override 080 public int hashCode() { 081 if (!hashCodeComputed) { 082 generateHashCode(); 083 } 084 return cachedHashCode; 085 } 086 087 @Override 088 protected void resolve(final ClassConstantPool pool) { 089 super.resolve(pool); 090 index = pool.indexOf(utf8); 091 } 092 093 @Override 094 public String toString() { 095 return "Class: " + getName(); 096 } 097 098 @Override 099 protected void writeBody(final DataOutputStream dos) throws IOException { 100 dos.writeShort(index); 101 } 102}