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 * Constant pool entry for a class 024 */ 025public class CPClass extends ConstantPoolEntry { 026 027 private int index; 028 029 public String name; 030 031 private final CPUTF8 utf8; 032 033 /** 034 * Creates a new CPClass 035 * 036 * @param name TODO 037 * @param globalIndex index in CpBands 038 * @throws NullPointerException if name is null 039 */ 040 public CPClass(final CPUTF8 name, final int globalIndex) { 041 super(ConstantPoolEntry.CP_Class, globalIndex); 042 if (name == null) { 043 throw new NullPointerException("Null arguments are not allowed"); 044 } 045 this.name = name.underlyingString(); 046 this.utf8 = name; 047 } 048 049 @Override 050 public boolean equals(final Object obj) { 051 if (this == obj) { 052 return true; 053 } 054 if (obj == null) { 055 return false; 056 } 057 if (this.getClass() != obj.getClass()) { 058 return false; 059 } 060 final CPClass other = (CPClass) obj; 061 return utf8.equals(other.utf8); 062 } 063 064 @Override 065 protected ClassFileEntry[] getNestedClassFileEntries() { 066 return new ClassFileEntry[] {utf8,}; 067 } 068 069 private boolean hashcodeComputed; 070 private int cachedHashCode; 071 072 private void generateHashCode() { 073 hashcodeComputed = true; 074 cachedHashCode = utf8.hashCode(); 075 } 076 077 @Override 078 public int hashCode() { 079 if (!hashcodeComputed) { 080 generateHashCode(); 081 } 082 return cachedHashCode; 083 } 084 085 @Override 086 protected void resolve(final ClassConstantPool pool) { 087 super.resolve(pool); 088 index = pool.indexOf(utf8); 089 } 090 091 @Override 092 public String toString() { 093 return "Class: " + getName(); 094 } 095 096 public String getName() { 097 return name; 098 } 099 100 @Override 101 protected void writeBody(final DataOutputStream dos) throws IOException { 102 dos.writeShort(index); 103 } 104}