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    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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