/** @see org.eclipse.gef.commands.Command#canExecute() */
public boolean canExecute() {
if (source.equals(target)) return false;
// Check for existence of connection already
List transistions = source.getOutgoingTransitions();
for (int i = 0; i < transistions.size(); i++) {
if (((Transition) transistions.get(i)).target.equals(target)) return false;
}
return true;
}
/** @see org.eclipse.gef.commands.Command#redo() */
public void redo() {
source.addOutput(transition);
target.addInput(transition);
}
/** @see org.eclipse.gef.commands.Command#undo() */
public void undo() {
source.removeOutput(transition);
target.removeInput(transition);
}