package play.libs;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicLong;
import play.exceptions.UnexpectedException;
public class F {
public static class Promise<V> implements Future<V>, F.Action<V> {
final CountDownLatch taskLock = new CountDownLatch(1);
boolean cancelled = false;
public boolean cancel(boolean mayInterruptIfRunning) {
return false;
}
public boolean isCancelled() {
return false;
}
public boolean isDone() {
return invoked;
}
public V getOrNull() {
return result;
}
public V get() throws InterruptedException, ExecutionException {
taskLock.await();
if (exception != null) {
// The result of the promise is an exception - throw it
throw new ExecutionException(exception);
}
return result;
}
public V get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
taskLock.await(timeout, unit);
if (exception != null) {
// The result of the promise is an exception - throw it
throw new ExecutionException(exception);
}
return result;
}
List<F.Action<Promise<V>>> callbacks = new ArrayList<F.Action<Promise<V>>>();
boolean invoked = false;
V result = null;
Throwable exception = null;
public void invoke(V result) {
invokeWithResultOrException(result, null);
}
public void invokeWithException(Throwable t) {
invokeWithResultOrException(null, t);
}
protected void invokeWithResultOrException(V result, Throwable t) {
synchronized (this) {
if (!invoked) {
invoked = true;
this.result = result;
this.exception = t;
taskLock.countDown();
} else {
return;
}
}
for (F.Action<Promise<V>> callback : callbacks) {
callback.invoke(this);
}
}
public void onRedeem(F.Action<Promise<V>> callback) {
synchronized (this) {
if (!invoked) {
callbacks.add(callback);
}
}
if (invoked) {
callback.invoke(this);
}
}
public static <T> Promise<List<T>> waitAll(final Promise<T>... promises) {
return waitAll(Arrays.asList(promises));
}
public static <T> Promise<List<T>> waitAll(final Collection<Promise<T>> promises) {
final CountDownLatch waitAllLock = new CountDownLatch(promises.size());
final Promise<List<T>> result = new Promise<List<T>>() {
@Override
public boolean cancel(boolean mayInterruptIfRunning) {
boolean r = true;
for (Promise<T> f : promises) {
r = r & f.cancel(mayInterruptIfRunning);
}
return r;
}
@Override
public boolean isCancelled() {
boolean r = true;
for (Promise<T> f : promises) {
r = r & f.isCancelled();
}
return r;
}
@Override
public boolean isDone() {
boolean r = true;
for (Promise<T> f : promises) {
r = r & f.isDone();
}
return r;
}
@Override
public List<T> get() throws InterruptedException, ExecutionException {
waitAllLock.await();
List<T> r = new ArrayList<T>();
for (Promise<T> f : promises) {
r.add(f.get());
}
return r;
}
@Override
public List<T> get(long timeout, TimeUnit unit) throws InterruptedException, ExecutionException, TimeoutException {
waitAllLock.await(timeout, unit);
return get();
}
};
final F.Action<Promise<T>> action = new F.Action<Promise<T>>() {
public void invoke(Promise<T> completed) {
waitAllLock.countDown();
if (waitAllLock.getCount() == 0) {
try {
result.invoke(result.get());
} catch (Exception e) {
throw new UnexpectedException(e);
}
}
}
};
for (Promise<T> f : promises) {
f.onRedeem(action);
}
return result;
}
public static <A, B> Promise<F.Tuple<A, B>> wait2(Promise<A> tA, Promise<B> tB) {
final Promise<F.Tuple<A, B>> result = new Promise<F.Tuple<A, B>>();
final Promise<List<Object>> t = waitAll(new Promise[]{tA, tB});
t.onRedeem(new F.Action<Promise<List<Object>>>() {
public void invoke(Promise<List<Object>> completed) {
List<Object> values = completed.getOrNull();
result.invoke(new F.Tuple((A) values.get(0), (B) values.get(1)));
}
});
return result;
}
public static <A, B, C> Promise<F.T3<A, B, C>> wait3(Promise<A> tA, Promise<B> tB, Promise<C> tC) {
final Promise<F.T3<A, B, C>> result = new Promise<F.T3<A, B, C>>();
final Promise<List<Object>> t = waitAll(new Promise[]{tA, tB, tC});
t.onRedeem(new F.Action<Promise<List<Object>>>() {
public void invoke(Promise<List<Object>> completed) {
List<Object> values = completed.getOrNull();
result.invoke(new F.T3((A) values.get(0), (B) values.get(1), (C) values.get(2)));
}
});
return result;
}
public static <A, B, C, D> Promise<F.T4<A, B, C, D>> wait4(Promise<A> tA, Promise<B> tB, Promise<C> tC, Promise<D> tD) {
final Promise<F.T4<A, B, C, D>> result = new Promise<F.T4<A, B, C, D>>();
final Promise<List<Object>> t = waitAll(new Promise[]{tA, tB, tC, tD});
t.onRedeem(new F.Action<Promise<List<Object>>>() {
public void invoke(Promise<List<Object>> completed) {
List<Object> values = completed.getOrNull();
result.invoke(new F.T4((A) values.get(0), (B) values.get(1), (C) values.get(2), (D) values.get(3)));
}
});
return result;
}
public static <A, B, C, D, E> Promise<F.T5<A, B, C, D, E>> wait5(Promise<A> tA, Promise<B> tB, Promise<C> tC, Promise<D> tD, Promise<E> tE) {
final Promise<F.T5<A, B, C, D, E>> result = new Promise<F.T5<A, B, C, D, E>>();
final Promise<List<Object>> t = waitAll(new Promise[]{tA, tB, tC, tD, tE});
t.onRedeem(new F.Action<Promise<List<Object>>>() {
public void invoke(Promise<List<Object>> completed) {
List<Object> values = completed.getOrNull();
result.invoke(new F.T5((A) values.get(0), (B) values.get(1), (C) values.get(2), (D) values.get(3), (E) values.get(4)));
}
});
return result;
}
private static Promise<F.Tuple<Integer, Promise<Object>>> waitEitherInternal(final Promise<?>... futures) {
final Promise<F.Tuple<Integer, Promise<Object>>> result = new Promise<F.Tuple<Integer, Promise<Object>>>();
for (int i = 0; i < futures.length; i++) {
final int index = i + 1;
((Promise<Object>) futures[i]).onRedeem(new F.Action<Promise<Object>>() {
public void invoke(Promise<Object> completed) {
result.invoke(new F.Tuple(index, completed));
}
});
}
return result;
}
public static <A, B> Promise<F.Either<A, B>> waitEither(final Promise<A> tA, final Promise<B> tB) {
final Promise<F.Either<A, B>> result = new Promise<F.Either<A, B>>();
final Promise<F.Tuple<Integer, Promise<Object>>> t = waitEitherInternal(tA, tB);
t.onRedeem(new F.Action<Promise<F.Tuple<Integer, Promise<Object>>>>() {
public void invoke(Promise<F.Tuple<Integer, Promise<Object>>> completed) {
F.Tuple<Integer, Promise<Object>> value = completed.getOrNull();
switch (value._1) {
case 1:
result.invoke(F.Either.<A, B>_1((A) value._2.getOrNull()));
break;
case 2:
result.invoke(F.Either.<A, B>_2((B) value._2.getOrNull()));
break;
}
}
});
return result;
}
public static <A, B, C> Promise<F.E3<A, B, C>> waitEither(final Promise<A> tA, final Promise<B> tB, final Promise<C> tC) {
final Promise<F.E3<A, B, C>> result = new Promise<F.E3<A, B, C>>();
final Promise<F.Tuple<Integer, Promise<Object>>> t = waitEitherInternal(tA, tB, tC);
t.onRedeem(new F.Action<Promise<F.Tuple<Integer, Promise<Object>>>>() {
public void invoke(Promise<F.Tuple<Integer, Promise<Object>>> completed) {
F.Tuple<Integer, Promise<Object>> value = completed.getOrNull();
switch (value._1) {
case 1:
result.invoke(F.E3.<A, B, C>_1((A) value._2.getOrNull()));
break;
case 2:
result.invoke(F.E3.<A, B, C>_2((B) value._2.getOrNull()));
break;
case 3:
result.invoke(F.E3.<A, B, C>_3((C) value._2.getOrNull()));
break;
}
}
});
return result;
}
public static <A, B, C, D> Promise<F.E4<A, B, C, D>> waitEither(final Promise<A> tA, final Promise<B> tB, final Promise<C> tC, final Promise<D> tD) {
final Promise<F.E4<A, B, C, D>> result = new Promise<F.E4<A, B, C, D>>();
final Promise<F.Tuple<Integer, Promise<Object>>> t = waitEitherInternal(tA, tB, tC, tD);
t.onRedeem(new F.Action<Promise<F.Tuple<Integer, Promise<Object>>>>() {
public void invoke(Promise<F.Tuple<Integer, Promise<Object>>> completed) {
F.Tuple<Integer, Promise<Object>> value = completed.getOrNull();
switch (value._1) {
case 1:
result.invoke(F.E4.<A, B, C, D>_1((A) value._2.getOrNull()));
break;
case 2:
result.invoke(F.E4.<A, B, C, D>_2((B) value._2.getOrNull()));
break;
case 3:
result.invoke(F.E4.<A, B, C, D>_3((C) value._2.getOrNull()));
break;
case 4:
result.invoke(F.E4.<A, B, C, D>_4((D) value._2.getOrNull()));
break;
}
}
});
return result;
}
public static <A, B, C, D, E> Promise<F.E5<A, B, C, D, E>> waitEither(final Promise<A> tA, final Promise<B> tB, final Promise<C> tC, final Promise<D> tD, final Promise<E> tE) {
final Promise<F.E5<A, B, C, D, E>> result = new Promise<F.E5<A, B, C, D, E>>();
final Promise<F.Tuple<Integer, Promise<Object>>> t = waitEitherInternal(tA, tB, tC, tD, tE);
t.onRedeem(new F.Action<Promise<F.Tuple<Integer, Promise<Object>>>>() {
public void invoke(Promise<F.Tuple<Integer, Promise<Object>>> completed) {
F.Tuple<Integer, Promise<Object>> value = completed.getOrNull();
switch (value._1) {
case 1:
result.invoke(F.E5.<A, B, C, D, E>_1((A) value._2.getOrNull()));
break;
case 2:
result.invoke(F.E5.<A, B, C, D, E>_2((B) value._2.getOrNull()));
break;
case 3:
result.invoke(F.E5.<A, B, C, D, E>_3((C) value._2.getOrNull()));
break;
case 4:
result.invoke(F.E5.<A, B, C, D, E>_4((D) value._2.getOrNull()));
break;
case 5:
result.invoke(F.E5.<A, B, C, D, E>_5((E) value._2.getOrNull()));
break;
}
}
});
return result;
}
public static <T> Promise<T> waitAny(final Promise<T>... futures) {
final Promise<T> result = new Promise<T>();
final F.Action<Promise<T>> action = new F.Action<Promise<T>>() {
public void invoke(Promise<T> completed) {
synchronized (this) {
if (result.isDone()) {
return;
}
}
result.invoke(completed.getOrNull());
}
};
for (Promise<T> f : futures) {
f.onRedeem(action);
}
return result;
}
}
public static class Timeout extends Promise<Timeout> {
static Timer timer = new Timer("F.Timeout", true);
final public String token;
final public long delay;
public Timeout(String delay) {
this(Time.parseDuration(delay) * 1000);
}
public Timeout(String token, String delay) {
this(token, Time.parseDuration(delay) * 1000);
}
public Timeout(long delay) {
this("timeout", delay);
}
public Timeout(String token, long delay) {
this.delay = delay;
this.token = token;
final Timeout timeout = this;
timer.schedule(new TimerTask() {
@Override
public void run() {
timeout.invoke(timeout);
}
}, delay);
}
@Override
public String toString() {
return "Timeout(" + delay + ")";
}
}
public static Timeout Timeout(String delay) {
return new Timeout(delay);
}
public static Timeout Timeout(String token, String delay) {
return new Timeout(token, delay);
}
public static Timeout Timeout(long delay) {
return new Timeout(delay);
}
public static Timeout Timeout(String token, long delay) {
return new Timeout(token, delay);
}
public static class EventStream<T> {
final int bufferSize;
final ConcurrentLinkedQueue<T> events = new ConcurrentLinkedQueue<T>();
final List<Promise<T>> waiting = Collections.synchronizedList(new ArrayList<Promise<T>>());
public EventStream() {
this.bufferSize = 100;
}
public EventStream(int maxBufferSize) {
this.bufferSize = maxBufferSize;
}
public synchronized Promise<T> nextEvent() {
if (events.isEmpty()) {
LazyTask task = new LazyTask();
waiting.add(task);
return task;
}
return new LazyTask(events.peek());
}
public synchronized void publish(T event) {
if (events.size() > bufferSize) {
events.poll();
}
events.offer(event);
notifyNewEvent();
}
void notifyNewEvent() {
T value = events.peek();
for (Promise<T> task : waiting) {
task.invoke(value);
}
waiting.clear();
}
class LazyTask extends Promise<T> {
public LazyTask() {
}
public LazyTask(T value) {
invoke(value);
}
@Override
public T get() throws InterruptedException, ExecutionException {
T value = super.get();
markAsRead(value);
return value;
}
@Override
public T getOrNull() {
T value = super.getOrNull();
markAsRead(value);
return value;
}
private void markAsRead(T value) {
if (value != null) {
events.remove(value);
}
}
}
}
public static class IndexedEvent<M> {
private static final AtomicLong idGenerator = new AtomicLong(1);
final public M data;
final public Long id;
public IndexedEvent(M data) {
this.data = data;
this.id = idGenerator.getAndIncrement();
}
@Override
public String toString() {
return "Event(id: " + id + ", " + data + ")";
}
public static void resetIdGenerator() {
idGenerator.set(1);
}
}
public static class ArchivedEventStream<T> {
final int archiveSize;
final ConcurrentLinkedQueue<IndexedEvent<T>> events = new ConcurrentLinkedQueue<IndexedEvent<T>>();
final List<FilterTask<T>> waiting = Collections.synchronizedList(new ArrayList<FilterTask<T>>());
final List<EventStream<T>> pipedStreams = new ArrayList<EventStream<T>>();
public ArchivedEventStream(int archiveSize) {
this.archiveSize = archiveSize;
}
public synchronized EventStream<T> eventStream() {
final EventStream<T> stream = new EventStream<T>(archiveSize);
for (IndexedEvent<T> event : events) {
stream.publish(event.data);
}
pipedStreams.add(stream);
return stream;
}
public synchronized Promise<List<IndexedEvent<T>>> nextEvents(long lastEventSeen) {
FilterTask<T> filter = new FilterTask<T>(lastEventSeen);
waiting.add(filter);
notifyNewEvent();
return filter;
}
public synchronized List<IndexedEvent> availableEvents(long lastEventSeen) {
List<IndexedEvent> result = new ArrayList<IndexedEvent>();
for (IndexedEvent event : events) {
if (event.id > lastEventSeen) {
result.add(event);
}
}
return result;
}
public List<T> archive() {
List<T> result = new ArrayList<T>();
for (IndexedEvent<T> event : events) {
result.add(event.data);
}
return result;
}
public synchronized void publish(T event) {
if (events.size() >= archiveSize) {
events.poll();
}
events.offer(new IndexedEvent(event));
notifyNewEvent();
for (EventStream<T> eventStream : pipedStreams) {
eventStream.publish(event);
}
}
void notifyNewEvent() {
for (ListIterator<FilterTask<T>> it = waiting.listIterator(); it.hasNext();) {
FilterTask<T> filter = it.next();
for (IndexedEvent<T> event : events) {
filter.propose(event);
}
if (filter.trigger()) {
it.remove();
}
}
}
static class FilterTask<K> extends Promise<List<IndexedEvent<K>>> {
final Long lastEventSeen;
final List<IndexedEvent<K>> newEvents = new ArrayList<IndexedEvent<K>>();
public FilterTask(Long lastEventSeen) {
this.lastEventSeen = lastEventSeen;
}
public void propose(IndexedEvent<K> event) {
if (event.id > lastEventSeen) {
newEvents.add(event);
}
}
public boolean trigger() {
if (newEvents.isEmpty()) {
return false;
}
invoke(newEvents);
return true;
}
}
}
public static interface Action0 {
void invoke();
}
public static interface Action<T> {
void invoke(T result);
}
public static abstract class Option<T> implements Iterable<T> {
public abstract boolean isDefined();
public abstract T get();
public static <T> None<T> None() {
return (None<T>) (Object) None;
}
public static <T> Some<T> Some(T value) {
return new Some<T>(value);
}
}
public static <A> Some<A> Some(A a) {
return new Some(a);
}
public static class None<T> extends Option<T> {
@Override
public boolean isDefined() {
return false;
}
@Override
public T get() {
throw new IllegalStateException("No value");
}
public Iterator<T> iterator() {
return Collections.<T>emptyList().iterator();
}
@Override
public String toString() {
return "None";
}
}
public static None<Object> None = new None<Object>();
public static class Some<T> extends Option<T> {
final T value;
public Some(T value) {
this.value = value;
}
@Override
public boolean isDefined() {
return true;
}
@Override
public T get() {
return value;
}
public Iterator<T> iterator() {
return Collections.singletonList(value).iterator();
}
@Override
public String toString() {
return "Some(" + value + ")";
}
}
public static class Either<A, B> {
final public Option<A> _1;
final public Option<B> _2;
private Either(Option<A> _1, Option<B> _2) {
this._1 = _1;
this._2 = _2;
}
public static <A, B> Either<A, B> _1(A value) {
return new Either(Some(value), None);
}
public static <A, B> Either<A, B> _2(B value) {
return new Either(None, Some(value));
}
@Override
public String toString() {
return "E2(_1: " + _1 + ", _2: " + _2 + ")";
}
}
public static class E2<A, B> extends Either<A, B> {
private E2(Option<A> _1, Option<B> _2) {
super(_1, _2);
}
}
public static class E3<A, B, C> {
final public Option<A> _1;
final public Option<B> _2;
final public Option<C> _3;
private E3(Option<A> _1, Option<B> _2, Option<C> _3) {
this._1 = _1;
this._2 = _2;
this._3 = _3;
}
public static <A, B, C> E3<A, B, C> _1(A value) {
return new E3(Some(value), None, None);
}
public static <A, B, C> E3<A, B, C> _2(B value) {
return new E3(None, Some(value), None);
}
public static <A, B, C> E3<A, B, C> _3(C value) {
return new E3(None, None, Some(value));
}
@Override
public String toString() {
return "E3(_1: " + _1 + ", _2: " + _2 + ", _3:" + _3 + ")";
}
}
public static class E4<A, B, C, D> {
final public Option<A> _1;
final public Option<B> _2;
final public Option<C> _3;
final public Option<D> _4;
private E4(Option<A> _1, Option<B> _2, Option<C> _3, Option<D> _4) {
this._1 = _1;
this._2 = _2;
this._3 = _3;
this._4 = _4;
}
public static <A, B, C, D> E4<A, B, C, D> _1(A value) {
return new E4(Option.Some(value), None, None, None);
}
public static <A, B, C, D> E4<A, B, C, D> _2(B value) {
return new E4(None, Some(value), None, None);
}
public static <A, B, C, D> E4<A, B, C, D> _3(C value) {
return new E4(None, None, Some(value), None);
}
public static <A, B, C, D> E4<A, B, C, D> _4(D value) {
return new E4(None, None, None, Some(value));
}
@Override
public String toString() {
return "E4(_1: " + _1 + ", _2: " + _2 + ", _3:" + _3 + ", _4:" + _4 + ")";
}
}
public static class E5<A, B, C, D, E> {
final public Option<A> _1;
final public Option<B> _2;
final public Option<C> _3;
final public Option<D> _4;
final public Option<E> _5;
private E5(Option<A> _1, Option<B> _2, Option<C> _3, Option<D> _4, Option<E> _5) {
this._1 = _1;
this._2 = _2;
this._3 = _3;
this._4 = _4;
this._5 = _5;
}
public static <A, B, C, D, E> E5<A, B, C, D, E> _1(A value) {
return new E5(Option.Some(value), None, None, None, None);
}
public static <A, B, C, D, E> E5<A, B, C, D, E> _2(B value) {
return new E5(None, Option.Some(value), None, None, None);
}
public static <A, B, C, D, E> E5<A, B, C, D, E> _3(C value) {
return new E5(None, None, Option.Some(value), None, None);
}
public static <A, B, C, D, E> E5<A, B, C, D, E> _4(D value) {
return new E5(None, None, None, Option.Some(value), None);
}
public static <A, B, C, D, E> E5<A, B, C, D, E> _5(E value) {
return new E5(None, None, None, None, Option.Some(value));
}
@Override
public String toString() {
return "E5(_1: " + _1 + ", _2: " + _2 + ", _3:" + _3 + ", _4:" + _4 + ", _5:" + _5 + ")";
}
}
public static class Tuple<A, B> {
final public A _1;
final public B _2;
public Tuple(A _1, B _2) {
this._1 = _1;
this._2 = _2;
}
@Override
public String toString() {
return "T2(_1: " + _1 + ", _2: " + _2 + ")";
}
}
public static <A, B> Tuple<A, B> Tuple(A a, B b) {
return new Tuple(a, b);
}
public static class T2<A, B> extends Tuple<A, B> {
public T2(A _1, B _2) {
super(_1, _2);
}
}
public static <A, B> T2<A, B> T2(A a, B b) {
return new T2(a, b);
}
public static class T3<A, B, C> {
final public A _1;
final public B _2;
final public C _3;
public T3(A _1, B _2, C _3) {
this._1 = _1;
this._2 = _2;
this._3 = _3;
}
@Override
public String toString() {
return "T3(_1: " + _1 + ", _2: " + _2 + ", _3:" + _3 + ")";
}
}
public static <A, B, C> T3<A, B, C> T3(A a, B b, C c) {
return new T3(a, b, c);
}
public static class T4<A, B, C, D> {
final public A _1;
final public B _2;
final public C _3;
final public D _4;
public T4(A _1, B _2, C _3, D _4) {
this._1 = _1;
this._2 = _2;
this._3 = _3;
this._4 = _4;
}
@Override
public String toString() {
return "T4(_1: " + _1 + ", _2: " + _2 + ", _3:" + _3 + ", _4:" + _4 + ")";
}
}
public static <A, B, C, D> T4<A, B, C, D> T4(A a, B b, C c, D d) {
return new T4<A, B, C, D>(a, b, c, d);
}
public static class T5<A, B, C, D, E> {
final public A _1;
final public B _2;
final public C _3;
final public D _4;
final public E _5;
public T5(A _1, B _2, C _3, D _4, E _5) {
this._1 = _1;
this._2 = _2;
this._3 = _3;
this._4 = _4;
this._5 = _5;
}
@Override
public String toString() {
return "T5(_1: " + _1 + ", _2: " + _2 + ", _3:" + _3 + ", _4:" + _4 + ", _5:" + _5 + ")";
}
}
public static <A, B, C, D, E> T5<A, B, C, D, E> T5(A a, B b, C c, D d, E e) {
return new T5<A, B, C, D, E>(a, b, c, d, e);
}
public static abstract class Matcher<T, R> {
public abstract Option<R> match(T o);
public Option<R> match(Option<T> o) {
if (o.isDefined()) {
return match(o.get());
}
return Option.None();
}
public <NR> Matcher<T, NR> and(final Matcher<R, NR> nextMatcher) {
final Matcher<T, R> firstMatcher = this;
return new Matcher<T, NR>() {
@Override
public Option<NR> match(T o) {
for (R r : firstMatcher.match(o)) {
return nextMatcher.match(r);
}
return Option.None();
}
};
}
public static Matcher<Object, String> String = new Matcher<Object, String>() {
@Override
public Option<String> match(Object o) {
if (o instanceof String) {
return Option.Some((String) o);
}
return Option.None();
}
};
public static <K> Matcher<Object, K> ClassOf(final Class<K> clazz) {
return new Matcher<Object, K>() {
@Override
public Option<K> match(Object o) {
if (o instanceof Option && ((Option) o).isDefined()) {
o = ((Option) o).get();
}
if (clazz.isInstance(o)) {
return Option.Some((K) o);
}
return Option.None();
}
};
}
public static Matcher<String, String> StartsWith(final String prefix) {
return new Matcher<String, String>() {
@Override
public Option<String> match(String o) {
if (o.startsWith(prefix)) {
return Option.Some(o);
}
return Option.None();
}
};
}
public static Matcher<String, String> Re(final String pattern) {
return new Matcher<String, String>() {
@Override
public Option<String> match(String o) {
if (o.matches(pattern)) {
return Option.Some(o);
}
return Option.None();
}
};
}
public static <X> Matcher<X, X> Equals(final X other) {
return new Matcher<X, X>() {
@Override
public Option<X> match(X o) {
if (o.equals(other)) {
return Option.Some(o);
}
return Option.None();
}
};
}
}
}