    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 * Method reference constant pool entry.
    021 */
    022public class CPMethodRef extends CPRef {
    023
    024    private boolean hashCodeComputed;
    025
    026    private int cachedHashCode;
    027
    028    public CPMethodRef(final CPClass className, final CPNameAndType descriptor, final int globalIndex) {
    029        super(ConstantPoolEntry.CP_Methodref, className, descriptor, globalIndex);
    030    }
    031
    032    private void generateHashCode() {
    033        hashCodeComputed = true;
    034        final int PRIME = 31;
    035        int result = 1;
    036        result = PRIME * result + className.hashCode();
    037        result = PRIME * result + nameAndType.hashCode();
    038        cachedHashCode = result;
    039    }
    040
    041    @Override
    042    protected ClassFileEntry[] getNestedClassFileEntries() {
    043        return new ClassFileEntry[] { className, nameAndType };
    044    }
    045
    046    @Override
    047    public int hashCode() {
    048        if (!hashCodeComputed) {
    049            generateHashCode();
    050        }
    051        return cachedHashCode;
    052    }
    053
    054}