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 * UTF8 constant pool entry, used for storing long Strings. 025 */ 026public class CPUTF8 extends ConstantPoolEntry { 027 028 private final String utf8; 029 030 private boolean hashCodeComputed; 031 032 private int cachedHashCode; 033 034 public CPUTF8(final String string) { 035 this(string, -1); 036 } 037 038 /** 039 * Creates a new CPUTF8 instance 040 * 041 * @param utf8 TODO 042 * @param globalIndex - index in CpBands 043 * @throws NullPointerException if utf8 is null 044 */ 045 public CPUTF8(final String utf8, final int globalIndex) { 046 super(ConstantPoolEntry.CP_UTF8, globalIndex); 047 this.utf8 = Objects.requireNonNull(utf8, "utf8"); 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 CPUTF8 other = (CPUTF8) obj; 061 return utf8.equals(other.utf8); 062 } 063 064 private void generateHashCode() { 065 hashCodeComputed = true; 066 final int PRIME = 31; 067 cachedHashCode = PRIME + utf8.hashCode(); 068 } 069 070 @Override 071 public int hashCode() { 072 if (!hashCodeComputed) { 073 generateHashCode(); 074 } 075 return cachedHashCode; 076 } 077 078 public void setGlobalIndex(final int index) { 079 globalIndex = index; 080 } 081 082 @Override 083 public String toString() { 084 return "UTF8: " + utf8; 085 } 086 087 public String underlyingString() { 088 return utf8; 089 } 090 091 @Override 092 protected void writeBody(final DataOutputStream dos) throws IOException { 093 dos.writeUTF(utf8); 094 } 095}