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/*
 * 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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
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package com.sun.org.apache.bcel.internal.generic;

/**
 * Denote that a class targets InstructionHandles within an InstructionList. Namely the following implementers:
 *
 * @see BranchHandle
 * @see LocalVariableGen
 * @see CodeExceptionGen
 */
public interface InstructionTargeter {

    // static final InstructionTargeter[] EMPTY_ARRAY = new InstructionTargeter[0];

    /**
     * Checks whether this targeter targets the specified instruction handle.
     */
    boolean containsTarget(InstructionHandle ih);

    /**
     * Replaces the target of this targeter from this old handle to the new handle.
     *
     * @param oldIh the old handle
     * @param newIh the new handle
     * @throws ClassGenException if oldIh is not targeted by this object
     */
    void updateTarget(InstructionHandle oldIh, InstructionHandle newIh) throws ClassGenException;
}
