/*
* (non-Javadoc)
* @see org.eclipse.emf.henshin.interpreter.UnitApplication#execute(org.eclipse.emf.henshin.interpreter.ApplicationMonitor)
*/
@Override
public boolean execute(ApplicationMonitor monitor) {
if (unit == null) {
throw new NullPointerException("No transformation unit set");
}
// Already executed?
if (isExecuted) {
if (isCompleteMatchDerived) {
completeMatch = null; // reset the complete match if it was derived
isCompleteMatchDerived = false;
}
isExecuted = false;
isUndone = false;
change = null;
resultMatch = null;
}
// Do we need to derive a complete match?
if (completeMatch == null) {
completeMatch = engine.findMatches((Rule) unit, graph, partialMatch).iterator().next();
isCompleteMatchDerived = true;
}
if (completeMatch == null) {
if (monitor != null) {
monitor.notifyExecute(this, false);
}
return false;
}
resultMatch = new MatchImpl((Rule) unit, true);
change = engine.createChange((Rule) unit, graph, completeMatch, resultMatch);
if (change == null) {
if (monitor != null) {
monitor.notifyExecute(this, false);
}
return false;
}
change.applyAndReverse();
isExecuted = true;
if (monitor != null) {
monitor.notifyExecute(this, true);
}
return true;
}
/*
* (non-Javadoc)
* @see org.eclipse.emf.henshin.interpreter.UnitApplication#redo(org.eclipse.emf.henshin.interpreter.ApplicationMonitor)
*/
public boolean redo(ApplicationMonitor monitor) {
boolean success = false;
if (isExecuted && isUndone) {
change.applyAndReverse();
isUndone = false;
success = true;
}
if (monitor != null) {
monitor.notifyUndo(this, success);
}
return success;
}