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 */
019
020package org.apache.commons.compress.harmony.unpack200.bytecode;
021
022/**
023 * Interface method reference constant pool entry.
024 */
025public class CPInterfaceMethodRef extends CPRef {
026
027    private boolean hashCodeComputed;
028
029    private int cachedHashCode;
030
031    public CPInterfaceMethodRef(final CPClass className, final CPNameAndType descriptor, final int globalIndex) {
032        super(CP_InterfaceMethodref, className, descriptor, globalIndex);
033    }
034
035    private void generateHashCode() {
036        hashCodeComputed = true;
037        final int PRIME = 31;
038        int result = 1;
039        result = PRIME * result + className.hashCode();
040        result = PRIME * result + nameAndType.hashCode();
041        cachedHashCode = result;
042    }
043
044    @Override
045    public int hashCode() {
046        if (!hashCodeComputed) {
047            generateHashCode();
048        }
049        return cachedHashCode;
050    }
051
052    /**
053     * This method answers the value this method will use for an invokeinterface call. This is equal to 1 + the count of all the args, where longs and doubles
054     * count for 2 and all others count for 1.
055     *
056     * @return integer count
057     */
058    public int invokeInterfaceCount() {
059        return nameAndType.invokeInterfaceCount();
060    }
061
062}