/*
* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed 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.bcel5_2_0.generic;
/**
* Thrown by InstructionList.remove() when one or multiple disposed instruction
* are still being referenced by a 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:
*
* <PRE>
* ...
* try {
* il.delete(start_ih, end_ih);
* } catch(TargetLostException e) {
* InstructionHandle[] targets = e.getTargets();
* for(int i=0; i < targets.length; i++) {
* InstructionTargeter[] targeters = targets[i].getTargeters();
*
* for(int j=0; j < targeters.length; j++)
* targeters[j].updateTarget(targets[i], new_target);
* }
* }
* </PRE>
*
* @see InstructionHandle
* @see InstructionList
* @see InstructionTargeter
* @version $Id: TargetLostException.java 386056 2006-03-15 11:31:56Z tcurdt $
* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
*/
public final class TargetLostException extends Exception {
private InstructionHandle[] targets;
TargetLostException(InstructionHandle[] t, String mesg) {
super(mesg);
targets = t;
}
/**
* @return list of instructions still being targeted.
*/
public InstructionHandle[] getTargets() {
return targets;
}
}