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using System;
using Mammoth.Couscous.java.util.function;
namespace Mammoth.Couscous.java.util
{
internal interface Optional<T>
{
bool isPresent();
Optional<U> map<U>(Function<T, U> function);
Optional<U> flatMap<U>(Function<T, Optional<U>> function);
T orElse(T value);
T orElseGet(Supplier<T> supplier);
T orElseThrow<TException>(Supplier<TException> exceptionSupplier) where TException : Exception;
T get();
void ifPresent(Consumer<T> consumer);
}
internal class None<T> : Optional<T> {
public bool isPresent() {
return false;
}
public Optional<U> map<U>(Function<T, U> function) {
return new None<U>();
}
public Optional<U> flatMap<U>(Function<T, Optional<U>> function) {
return new None<U>();
}
public T orElse(T value) {
return value;
}
public T orElseGet(Supplier<T> supplier) {
return supplier.get();
}
public T orElseThrow<TException>(Supplier<TException> exceptionSupplier) where TException : Exception {
throw exceptionSupplier.get();
}
public T get() {
throw new NoSuchElementException();
}
public void ifPresent(Consumer<T> consumer) {
}
}
internal class Some<T> : Optional<T> {
private readonly T _value;
internal Some(T value) {
_value = value;
}
public bool isPresent() {
return true;
}
public Optional<U> map<U>(Function<T, U> function) {
return new Some<U>(function.apply(_value));
}
public Optional<U> flatMap<U>(Function<T, Optional<U>> function) {
return function.apply(_value);
}
public T orElse(T value) {
return _value;
}
public T orElseGet(Supplier<T> supplier) {
return _value;
}
public T orElseThrow<TException>(Supplier<TException> exceptionSupplier) where TException : Exception {
return _value;
}
public T get() {
return _value;
}
public void ifPresent(Consumer<T> consumer) {
consumer.accept(_value);
}
}
internal static class Optional
{
internal static Optional<T> empty<T>()
{
return new None<T>();
}
internal static Optional<T> of<T>(T value)
{
return new Some<T> (value);
}
}
}
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