https://commons.apache.org/proper/commons-bcel: Apache Commons Bytecode Engineering Library (The Apache Software Foundation)
  • Enver Haase
  • David Dixon-Peugh
  • Patrick Beard
  • Conor MacNeill
  • Costin Manolache
  • Bill Pugh
  • First Hop Ltd / Torsten Rueger
  • Jérôme Leroux
  • Mark Roberts
  • Sam Yoon
  • Dave Brosius
  • Torsten Curdt (ASF)
  • Markus Dahm (it-frameworksolutions)
  • Jason van Zyl
  • Gary Gregory (Rocket Software) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 */
package org.apache.bcel.generic;


Thrown by InstructionList.remove() when one or multiple disposed instructions
are still being referenced by an InstructionTargeter object. I.e. the
InstructionTargeter has to be notified that (one of) the InstructionHandle it
is referencing is being removed from the InstructionList and thus not valid anymore.

Making this an exception instead of a return value forces the user to handle
these case explicitely in a try { ... } catch. The following code illustrates
how this may be done:


    ...
    try {
        il.delete(start_ih, end_ih);
    } catch(TargetLostException e) {
        for (InstructionHandle target : e.getTargets()) {
            for (InstructionTargeter targeter : target.getTargeters()) {
                targeter.updateTarget(target, new_target);
            }
        }
    }



See Also:
/**
 * Thrown by InstructionList.remove() when one or multiple disposed instructions
 * are still being referenced by an InstructionTargeter object. I.e. the
 * InstructionTargeter has to be notified that (one of) the InstructionHandle it
 * is referencing is being removed from the InstructionList and thus not valid anymore.
 *
 * <p>Making this an exception instead of a return value forces the user to handle
 * these case explicitely in a try { ... } catch. The following code illustrates
 * how this may be done:</p>
 *
 * <PRE>
 *     ...
 *     try {
 *         il.delete(start_ih, end_ih);
 *     } catch(TargetLostException e) {
 *         for (InstructionHandle target : e.getTargets()) {
 *             for (InstructionTargeter targeter : target.getTargeters()) {
 *                 targeter.updateTarget(target, new_target);
 *             }
 *         }
 *     }
 * </PRE>
 *
 * @see InstructionHandle
 * @see InstructionList
 * @see InstructionTargeter
 */
public final class TargetLostException extends Exception {

    private static final long serialVersionUID = -6857272667645328384L;
    private final InstructionHandle[] targets;


    TargetLostException(final InstructionHandle[] t, final String mesg) {
        super(mesg);
        targets = t;
    }


    
Returns:list of instructions still being targeted.
/**
     * @return list of instructions still being targeted.
     */
    public InstructionHandle[] getTargets() {
        return targets;
    }
}