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.util.Objects;
020
021/**
022 * Abstract superclass for constant pool constant entries such as numbers or Strings
023 */
024public abstract class CPConstant extends ConstantPoolEntry {
025
026    private final Object value;
027
028    /**
029     * Constructs a new CPConstant.
030     *
031     * @param tag         TODO
032     * @param value       TODO
033     * @param globalIndex index in CpBands
034     * @throws NullPointerException if value is null
035     */
036    public CPConstant(final byte tag, final Object value, final int globalIndex) {
037        super(tag, globalIndex);
038        this.value = Objects.requireNonNull(value, "value");
039    }
040
041    @Override
042    public boolean equals(final Object obj) {
043        if (this == obj) {
044            return true;
045        }
046        if (obj == null) {
047            return false;
048        }
049        if (this.getClass() != obj.getClass()) {
050            return false;
051        }
052        final CPConstant other = (CPConstant) obj;
053        return Objects.equals(value, other.value);
054    }
055
056    protected Object getValue() {
057        return value;
058    }
059
060    @Override
061    public int hashCode() {
062        return Objects.hash(value);
063    }
064}