    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.commons.compress.harmony.unpack200.bytecode;
    020
    021/**
    022 * Method reference constant pool entry.
    023 */
    024public class CPMethodRef extends CPRef {
    025
    026    private boolean hashCodeComputed;
    027
    028    private int cachedHashCode;
    029
    030    public CPMethodRef(final CPClass className, final CPNameAndType descriptor, final int globalIndex) {
    031        super(CP_Methodref, className, descriptor, globalIndex);
    032    }
    033
    034    private void generateHashCode() {
    035        hashCodeComputed = true;
    036        final int PRIME = 31;
    037        int result = 1;
    038        result = PRIME * result + className.hashCode();
    039        result = PRIME * result + nameAndType.hashCode();
    040        cachedHashCode = result;
    041    }
    042
    043    @Override
    044    protected ClassFileEntry[] getNestedClassFileEntries() {
    045        return new ClassFileEntry[] { className, nameAndType };
    046    }
    047
    048    @Override
    049    public int hashCode() {
    050        if (!hashCodeComputed) {
    051            generateHashCode();
    052        }
    053        return cachedHashCode;
    054    }
    055
    056}