/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.commons.compress.harmony.unpack200.bytecode;

import java.util.Objects;

/**
 * Abstract superclass for constant pool constant entries such as numbers or Strings
 */
public abstract class CPConstant extends ConstantPoolEntry {

    private final Object value;

    /**
     * Constructs a new CPConstant.
     *
     * @param tag         TODO
     * @param value       TODO
     * @param globalIndex index in CpBands
     * @throws NullPointerException if value is null
     */
    public CPConstant(final byte tag, final Object value, final int globalIndex) {
        super(tag, globalIndex);
        this.value = Objects.requireNonNull(value, "value");
    }

    @Override
    public boolean equals(final Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null || this.getClass() != obj.getClass()) {
            return false;
        }
        final CPConstant other = (CPConstant) obj;
        return Objects.equals(value, other.value);
    }

    /**
     * Gets the value.
     *
     * @return the value.
     */
    protected Object getValue() {
        return value;
    }

    @Override
    public int hashCode() {
        return Objects.hash(value);
    }
}
