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Java > Open Source Codes > org > apache > bcel > generic > TargetLostException


1 /*
2  * Copyright 2000-2004 The Apache Software Foundation
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  *
16  */
17 package org.apache.bcel.generic;
18
19 /**
20  * Thrown by InstructionList.remove() when one or multiple disposed instruction
21  * are still being referenced by a InstructionTargeter object. I.e. the
22  * InstructionTargeter has to be notified that (one of) the InstructionHandle it
23  * is referencing is being removed from the InstructionList and thus not valid anymore.
24  *
25  * Making this an exception instead of a return value forces the user to handle
26  * these case explicitely in a try { ... } catch. The following code illustrates
27  * how this may be done:
28  *
29  * <PRE>
30  * ...
31  * try {
32  * il.delete(start_ih, end_ih);
33  * } catch(TargetLostException e) {
34  * InstructionHandle[] targets = e.getTargets();
35  * for(int i=0; i < targets.length; i++) {
36  * InstructionTargeter[] targeters = targets[i].getTargeters();
37  *
38  * for(int j=0; j < targeters.length; j++)
39  * targeters[j].updateTarget(targets[i], new_target);
40  * }
41  * }
42  * </PRE>
43  *
44  * @see InstructionHandle
45  * @see InstructionList
46  * @see InstructionTargeter
47  * @version $Id: TargetLostException.java 386056 2006-03-15 11:31:56Z tcurdt $
48  * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
49  */
50 public final class TargetLostException extends Exception JavaDoc {
51
52     private InstructionHandle[] targets;
53
54
55     TargetLostException(InstructionHandle[] t, String JavaDoc mesg) {
56         super(mesg);
57         targets = t;
58     }
59
60
61     /**
62      * @return list of instructions still being targeted.
63      */
64     public InstructionHandle[] getTargets() {
65         return targets;
66     }
67 }
68
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