    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 */
    017
    018package org.apache.bcel.generic;
    019
    020/**
    021 * Denotes that a class targets InstructionHandles within an InstructionList.
    022 *
    023 * @see BranchHandle
    024 * @see LocalVariableGen
    025 * @see CodeExceptionGen
    026 */
    027public interface InstructionTargeter {
    028
    029    // static final InstructionTargeter[] EMPTY_ARRAY = new InstructionTargeter[0];
    030
    031    /**
    032     * Tests whether this targeter targets the specified instruction handle.
    033     *
    034     * @param instructionHandle the instruction handle to test.
    035     * @return whether this targeter targets the specified instruction handle.
    036     */
    037    boolean containsTarget(InstructionHandle instructionHandle);
    038
    039    /**
    040     * Replaces the target of this targeter from this old handle to the new handle.
    041     *
    042     * @param oldIh the old handle
    043     * @param newIh the new handle
    044     * @throws ClassGenException if oldIh is not targeted by this object
    045     */
    046    void updateTarget(InstructionHandle oldIh, InstructionHandle newIh) throws ClassGenException;
    047}