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 * String constant pool entry. 024 */ 025public class CPString extends CPConstant { 026 027 private transient int nameIndex; 028 private final CPUTF8 name; 029 030 public CPString(final CPUTF8 value, final int globalIndex) { 031 super(ConstantPoolEntry.CP_String, value, globalIndex); 032 this.name = value; 033 } 034 035 @Override 036 protected void writeBody(final DataOutputStream dos) throws IOException { 037 dos.writeShort(nameIndex); 038 } 039 040 @Override 041 public String toString() { 042 return "String: " + getValue(); 043 } 044 045 /** 046 * Allows the constant pool entries to resolve their nested entries 047 * 048 * @param pool TODO 049 */ 050 @Override 051 protected void resolve(final ClassConstantPool pool) { 052 super.resolve(pool); 053 nameIndex = pool.indexOf(name); 054 } 055 056 @Override 057 protected ClassFileEntry[] getNestedClassFileEntries() { 058 return new ClassFileEntry[] {name}; 059 } 060 061 private boolean hashcodeComputed; 062 private int cachedHashCode; 063 064 private void generateHashCode() { 065 hashcodeComputed = true; 066 final int PRIME = 31; 067 int result = 1; 068 result = PRIME * result + name.hashCode(); 069 cachedHashCode = result; 070 } 071 072 @Override 073 public int hashCode() { 074 if (!hashcodeComputed) { 075 generateHashCode(); 076 } 077 return cachedHashCode; 078 } 079}