public Object invoke(
ModuleInstance module,
Object source,
Object[] args,
QvtOperationalEvaluationEnv evalEnv) {
String self = (String) source;
StringCounter counters = StringCounter.getInstance(evalEnv);
Integer currentValue = counters.value(self);
if (currentValue == null) {
counters.start(self);
return self;
}
counters.increment(self);
return self + currentValue.toString();
}
