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