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Java > Open Source Codes > com > sun > org > apache > bcel > internal > generic > TargetLostException


1 package com.sun.org.apache.bcel.internal.generic;
2
3 /* ====================================================================
4  * The Apache Software License, Version 1.1
5  *
6  * Copyright (c) 2001 The Apache Software Foundation. All rights
7  * reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution,
22  * if any, must include the following acknowledgment:
23  * "This product includes software developed by the
24  * Apache Software Foundation (http://www.apache.org/)."
25  * Alternately, this acknowledgment may appear in the software itself,
26  * if and wherever such third-party acknowledgments normally appear.
27  *
28  * 4. The names "Apache" and "Apache Software Foundation" and
29  * "Apache BCEL" must not be used to endorse or promote products
30  * derived from this software without prior written permission. For
31  * written permission, please contact apache@apache.org.
32  *
33  * 5. Products derived from this software may not be called "Apache",
34  * "Apache BCEL", nor may "Apache" appear in their name, without
35  * prior written permission of the Apache Software Foundation.
36  *
37  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48  * SUCH DAMAGE.
49  * ====================================================================
50  *
51  * This software consists of voluntary contributions made by many
52  * individuals on behalf of the Apache Software Foundation. For more
53  * information on the Apache Software Foundation, please see
54  * <http://www.apache.org/>.
55  */
56
57 /**
58  * Thrown by InstructionList.remove() when one or multiple disposed instruction
59  * are still being referenced by a InstructionTargeter object. I.e. the
60  * InstructionTargeter has to be notified that (one of) the InstructionHandle it
61  * is referencing is being removed from the InstructionList and thus not valid anymore.
62  *
63  * Making this an exception instead of a return value forces the user to handle
64  * these case explicitely in a try { ... } catch. The following code illustrates
65  * how this may be done:
66  *
67  * <PRE>
68  * ...
69  * try {
70  * il.delete(start_ih, end_ih);
71  * } catch(TargetLostException e) {
72  * InstructionHandle[] targets = e.getTargets();
73  * for(int i=0; i < targets.length; i++) {
74  * InstructionTargeter[] targeters = targets[i].getTargeters();
75  *
76  * for(int j=0; j < targeters.length; j++)
77  * targeters[j].updateTarget(targets[i], new_target);
78  * }
79  * }
80  * </PRE>
81  *
82  * @see InstructionHandle
83  * @see InstructionList
84  * @see InstructionTargeter
85  * @version $Id: TargetLostException.java,v 1.1.1.1 2001/10/29 20:00:27 jvanzyl Exp $
86  * @author <A HREF="mailto:markus.dahm@berlin.de">M. Dahm</A>
87  */
88 public final class TargetLostException extends Exception JavaDoc {
89   private InstructionHandle[] targets;
90
91   TargetLostException(InstructionHandle[] t, String JavaDoc mesg) {
92     super(mesg);
93     targets = t;
94   }
95
96   /**
97    * @return list of instructions still being targeted.
98    */
99   public InstructionHandle[] getTargets() { return targets; }
100 }
101
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