CPInterfaceMethodRef.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.commons.compress.harmony.unpack200.bytecode;

/**
 * Interface method reference constant pool entry.
 */
public class CPInterfaceMethodRef extends CPRef {

    private boolean hashCodeComputed;

    private int cachedHashCode;

    public CPInterfaceMethodRef(final CPClass className, final CPNameAndType descriptor, final int globalIndex) {
        super(CP_InterfaceMethodref, className, descriptor, globalIndex);
    }

    private void generateHashCode() {
        hashCodeComputed = true;
        final int PRIME = 31;
        int result = 1;
        result = PRIME * result + className.hashCode();
        result = PRIME * result + nameAndType.hashCode();
        cachedHashCode = result;
    }

    @Override
    public int hashCode() {
        if (!hashCodeComputed) {
            generateHashCode();
        }
        return cachedHashCode;
    }

    /**
     * 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
     * count for 2 and all others count for 1.
     *
     * @return integer count
     */
    public int invokeInterfaceCount() {
        return nameAndType.invokeInterfaceCount();
    }

}