1 package org.apache.bcel.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 {
89 private InstructionHandle[] targets;
90
91 TargetLostException(InstructionHandle[] t, String 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 }
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