/*
 * 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.bcel.generic;

/**
 * Denotes that a class targets InstructionHandles within an InstructionList.
 *
 * @see BranchHandle
 * @see LocalVariableGen
 * @see CodeExceptionGen
 */
public interface InstructionTargeter {

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

    /**
     * Tests whether this targeter targets the specified instruction handle.
     *
     * @param instructionHandle the instruction handle to test.
     * @return whether this targeter targets the specified instruction handle.
     */
    boolean containsTarget(InstructionHandle instructionHandle);

    /**
     * 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;
}
