    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}