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.bcel.generic;
021
022/**
023 * Denotes that a class targets InstructionHandles within an InstructionList.
024 *
025 * @see BranchHandle
026 * @see LocalVariableGen
027 * @see CodeExceptionGen
028 */
029public interface InstructionTargeter {
030
031    // static final InstructionTargeter[] EMPTY_ARRAY = new InstructionTargeter[0];
032
033    /**
034     * Tests whether this targeter targets the specified instruction handle.
035     *
036     * @param instructionHandle the instruction handle to test.
037     * @return whether this targeter targets the specified instruction handle.
038     */
039    boolean containsTarget(InstructionHandle instructionHandle);
040
041    /**
042     * Replaces the target of this targeter from this old handle to the new handle.
043     *
044     * @param oldIh the old handle
045     * @param newIh the new handle
046     * @throws ClassGenException if oldIh is not targeted by this object
047     */
048    void updateTarget(InstructionHandle oldIh, InstructionHandle newIh) throws ClassGenException;
049}