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; 018 019/** 020 * Abstract superclass for constant pool constant entries such as numbers or Strings 021 */ 022public abstract class CPConstant extends ConstantPoolEntry { 023 024 private final Object value; 025 026 /** 027 * Create a new CPConstant 028 * 029 * @param tag TODO 030 * @param value TODO 031 * @param globalIndex index in CpBands 032 * @throws NullPointerException if value is null 033 */ 034 public CPConstant(final byte tag, final Object value, final int globalIndex) { 035 super(tag, globalIndex); 036 this.value = value; 037 if (value == null) { 038 throw new NullPointerException("Null arguments are not allowed"); 039 } 040 } 041 042 @Override 043 public boolean equals(final Object obj) { 044 if (this == obj) { 045 return true; 046 } 047 if (obj == null) { 048 return false; 049 } 050 if (this.getClass() != obj.getClass()) { 051 return false; 052 } 053 final CPConstant other = (CPConstant) obj; 054 if (value == null) { 055 if (other.value != null) { 056 return false; 057 } 058 } else if (!value.equals(other.value)) { 059 return false; 060 } 061 return true; 062 } 063 064 @Override 065 public int hashCode() { 066 final int PRIME = 31; 067 int result = 1; 068 result = PRIME * result + ((value == null) ? 0 : value.hashCode()); 069 return result; 070 } 071 072 protected Object getValue() { 073 return value; 074 } 075}