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}