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import java.io.Serializable;
public class Issue3032 {
public static class PCollection<T> implements PValue {
public <OutputT extends POutput> OutputT apply(
String name, PTransform<? super PCollection<T>, OutputT> t) {
throw new RuntimeException();
}
}
public abstract static class PTransform<InputT extends PInput, OutputT extends POutput> {}
interface PInput {}
interface POutput {}
interface PValue extends PInput, POutput {}
static class BillingEvent {
InvoiceGroupingKey getInvoiceGroupingKey() {
throw new RuntimeException();
}
}
public static class MapElements<InputT, OutputT>
extends PTransform<PCollection<? extends InputT>, PCollection<OutputT>> {
public static <InputT, OutputT> MapElements<InputT, OutputT> via(
final ProcessFunction<InputT, OutputT> fn) {
throw new RuntimeException();
}
}
static class InvoiceGroupingKey {}
@FunctionalInterface
public interface ProcessFunction<InputT, OutputT> extends Serializable {
OutputT apply(InputT input) throws Exception;
}
private static class GenerateInvoiceRows
extends PTransform<PCollection<BillingEvent>, PCollection<String>> {
public void expand(PCollection<BillingEvent> input) {
input.apply(
"Map to invoicing key", MapElements.via(BillingEvent::getInvoiceGroupingKey));
}
}
}
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