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