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    private void generateHashCode() {
032        hashCodeComputed = true;
033        final int PRIME = 31;
034        int result = 1;
035        result = PRIME * result + className.hashCode();
036        result = PRIME * result + nameAndType.hashCode();
037        cachedHashCode = result;
038    }
039
040    @Override
041    protected ClassFileEntry[] getNestedClassFileEntries() {
042        return new ClassFileEntry[] {className, nameAndType};
043    }
044
045    @Override
046    public int hashCode() {
047        if (!hashCodeComputed) {
048            generateHashCode();
049        }
050        return cachedHashCode;
051    }
052
053}