    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements. See the NOTICE file distributed with this
    004 * work for additional information regarding copyright ownership. The ASF
    005 * licenses this file to You under the Apache License, Version 2.0 (the
    006 * "License"); you may not use this file except in compliance with the License.
    007 * You may obtain a copy of the License at
    008 * http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
    009 * or agreed to in writing, software distributed under the License is
    010 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    011 * KIND, either express or implied. See the License for the specific language
    012 * governing permissions and limitations under the License.
    013 */
    014package org.apache.commons.compress.harmony.unpack200.bytecode;
    015
    016/**
    017 * Interface method reference constant pool entry.
    018 */
    019public class CPInterfaceMethodRef extends CPRef {
    020
    021    private boolean hashCodeComputed;
    022
    023    private int cachedHashCode;
    024
    025    public CPInterfaceMethodRef(final CPClass className, final CPNameAndType descriptor, final int globalIndex) {
    026        super(CP_InterfaceMethodref, className, descriptor, globalIndex);
    027    }
    028
    029    private void generateHashCode() {
    030        hashCodeComputed = true;
    031        final int PRIME = 31;
    032        int result = 1;
    033        result = PRIME * result + className.hashCode();
    034        result = PRIME * result + nameAndType.hashCode();
    035        cachedHashCode = result;
    036    }
    037
    038    @Override
    039    public int hashCode() {
    040        if (!hashCodeComputed) {
    041            generateHashCode();
    042        }
    043        return cachedHashCode;
    044    }
    045
    046    /**
    047     * 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
    048     * count for 2 and all others count for 1.
    049     *
    050     * @return integer count
    051     */
    052    public int invokeInterfaceCount() {
    053        return nameAndType.invokeInterfaceCount();
    054    }
    055
    056}