1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.bcel.generic;
19
20 /**
21 * Denote that a class targets InstructionHandles within an InstructionList. Namely the following implementers:
22 *
23 * @see BranchHandle
24 * @see LocalVariableGen
25 * @see CodeExceptionGen
26 */
27 public interface InstructionTargeter {
28
29 // static final InstructionTargeter[] EMPTY_ARRAY = new InstructionTargeter[0];
30
31 /**
32 * Checks whether this targeter targets the specified instruction handle.
33 */
34 boolean containsTarget(InstructionHandle ih);
35
36 /**
37 * Replaces the target of this targeter from this old handle to the new handle.
38 *
39 * @param oldIh the old handle
40 * @param newIh the new handle
41 * @throws ClassGenException if oldIh is not targeted by this object
42 */
43 void updateTarget(InstructionHandle oldIh, InstructionHandle newIh) throws ClassGenException;
44 }