T - The type contained on the Maybe withinpublic class EvalTValue<T> extends java.lang.Object implements EvalT<T>, TransformerValue<T>, MonadicValue<T>, java.util.function.Supplier<T>, ConvertableFunctor<T>, Filterable<T>, Applicativable<T>, Matchable.ValueAndOptionalMatcher<T>
Applicativable.Applicatives, Applicativable.SemigroupApplyer<T>Value.ValueImpl<T>Convertable.SupplierToConvertable<T>| Modifier and Type | Method and Description |
|---|---|
<U> EvalTValue<U> |
cast(java.lang.Class<? extends U> type)
Cast all elements in a stream to a given type, possibly throwing a
ClassCastException. |
<R> EvalTValue<R> |
empty() |
static <T> EvalTValue<T> |
emptyMaybe() |
MaybeTValue<T> |
filter(java.util.function.Predicate<? super T> test)
Filter the wrapped Maybe
|
MaybeTValue<T> |
filterNot(java.util.function.Predicate<? super T> fn)
Remove any elements for which the predicate holds (inverse operation to filter)
e.g.
|
<B> EvalTValue<B> |
flatMap(java.util.function.Function<? super T,? extends Eval<? extends B>> f) |
<B> EvalTValue<B> |
flatMapT(java.util.function.Function<? super T,EvalTValue<? extends B>> f)
Flat Map the wrapped Maybe
|
static <A> EvalTValue<A> |
fromAnyM(AnyMValue<A> anyM)
|
static <A,V extends MonadicValue<Eval<A>>> |
fromValue(V monadicValue) |
T |
get() |
boolean |
isValuePresent() |
java.util.Iterator<T> |
iterator() |
static <U,R> java.util.function.Function<EvalTValue<U>,EvalTValue<R>> |
lift(java.util.function.Function<? super U,? extends R> fn)
Lift a function into one that accepts and returns an MaybeT This allows
multiple monad types to add functionality to existing functions and
methods
e.g.
|
static <U1,U2,R> java.util.function.BiFunction<EvalTValue<U1>,EvalTValue<U2>,EvalTValue<R>> |
lift2(java.util.function.BiFunction<? super U1,? super U2,? extends R> fn)
Lift a BiFunction into one that accepts and returns MaybeTs This allows
multiple monad types to add functionality to existing functions and
methods
e.g.
|
<B> EvalTValue<B> |
map(java.util.function.Function<? super T,? extends B> f)
Map the wrapped Maybe
|
MaybeTValue<T> |
notNull()
Filter elements retaining only values which are not null
|
static <A> EvalTValue<A> |
of(AnyMValue<Eval<A>> monads)
Construct an MaybeT from an AnyM that wraps a monad containing Maybes
|
static <T> EvalTValue<T> |
of(Eval<T> eval) |
<U> MaybeTValue<U> |
ofType(java.lang.Class<? extends U> type)
Keep only those elements in a stream that are of a given type.
|
<R> EvalTValue<R> |
patternMatch(java.util.function.Function<Matchable.CheckValue1<T,R>,Matchable.CheckValue1<T,R>> case1,
java.util.function.Supplier<? extends R> otherwise)
Transform the elements of this Stream with a Pattern Matching case and default value
|
EvalTValue<T> |
peek(java.util.function.Consumer<? super T> peek)
Peek at the current value of the Maybe
|
ReactiveSeq<T> |
stream() |
void |
subscribe(org.reactivestreams.Subscriber<? super T> s) |
boolean |
test(T t) |
java.lang.String |
toString() |
<R> EvalTValue<R> |
trampoline(java.util.function.Function<? super T,? extends Trampoline<? extends R>> mapper)
Performs a map operation that can call a recursive method without running out of stack space
|
<R> EvalTValue<R> |
unit(R value) |
AnyMValue<Eval<T>> |
unwrap() |
Eval<T> |
value() |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitbind, emptyList, fromAnyM, fromAnyMSeq, fromAnyMValue, fromFuture, fromIterable, fromIterableValue, fromOptional, fromPublisher, fromStream, offutureStream, getStreamable, isEmpty, jdkStream, reactiveSeq, reveresedJDKStream, reveresedStreamanyM, coflatMap, isPresent, nestap, ap, ap1, ap2, ap3, ap4, ap5fold, fold, generate, iterate, mapReduce, mkString, newSubscriber, of, toDequeX, toEvalAlways, toEvalLater, toEvalNow, toFeatureToggle, toFutureStream, toFutureStream, toIor, toLazyImmutable, toListX, toMaybe, toMutable, toPBagX, toPOrderedSetX, toPQueueX, toPSetX, toPStackX, toPVectorX, toQueueX, toSetX, toSimpleReact, toSimpleReact, toSortedSetX, toTry, toTry, toTry, toXor, toXor, unapply, visitendsWith, endsWithIterable, findAny, findFirst, firstValue, foldable, foldRight, foldRight, foldRight, foldRightMapToType, get, groupBy, headAndTail, join, join, join, mapReduce, print, print, printErr, printOut, reduce, reduce, reduce, reduce, reduce, reduce, reduce, schedule, scheduleFixedDelay, scheduleFixedRate, single, single, singleOptional, startsWith, startsWithIterable, toConcurrentLazyCollection, toConcurrentLazyStreamable, toLazyCollection, validate, visit, visit, xMatchfromSupplier, orElse, orElseGet, orElseThrow, toAtomicReference, toCompletableFuture, toCompletableFutureAsync, toCompletableFutureAsync, toFutureW, toList, toOptional, toOptionalAtomicReference, toStreamtoOptional, visitmatchespublic Eval<T> value()
value in interface TransformerValue<T>public EvalTValue<T> peek(java.util.function.Consumer<? super T> peek)
MaybeT.of(AnyM.fromStream(Maybe.of(10))
.peek(System.out::println);
//prints 10
public MaybeTValue<T> filter(java.util.function.Predicate<? super T> test)
MaybeT.of(AnyM.fromStream(Maybe.of(10))
.filter(t->t!=10);
//MaybeT<AnyMValue<Stream<Maybe.empty>>>
filter in interface EvalT<T>filter in interface TransformerValue<T>filter in interface Filterable<T>test - Predicate to filter the wrapped Maybepublic <B> EvalTValue<B> map(java.util.function.Function<? super T,? extends B> f)
MaybeT.of(AnyM.fromStream(Maybe.of(10))
.map(t->t=t+1);
//MaybeT<AnyMValue<Stream<Maybe[11]>>>
map in interface EvalT<T>map in interface TransformerValue<T>map in interface ConvertableFunctor<T>map in interface Functor<T>map in interface MonadicValue<T>f - Mapping function for the wrapped Maybepublic <B> EvalTValue<B> flatMapT(java.util.function.Function<? super T,EvalTValue<? extends B>> f)
MaybeT.of(AnyM.fromStream(Maybe.of(10))
.flatMap(t->Maybe.empty();
//MaybeT<AnyMValue<Stream<Maybe.empty>>>
f - FlatMap functionpublic <B> EvalTValue<B> flatMap(java.util.function.Function<? super T,? extends Eval<? extends B>> f)
public static <U,R> java.util.function.Function<EvalTValue<U>,EvalTValue<R>> lift(java.util.function.Function<? super U,? extends R> fn)
{
@code
Function add2 = i -> i + 2;
Function, MaybeT> optTAdd2 = MaybeT.lift(add2);
Stream withNulls = Stream.of(1, 2, null);
AnyMValue stream = AnyM.ofMonad(withNulls);
AnyMValue> streamOpt = stream.map(Maybe::ofNullable);
List results = optTAdd2.apply(MaybeT.of(streamOpt)).unwrap().>> unwrap()
.filter(Maybe::isPresent).map(Maybe::get).collect(Collectors.toList());
// Arrays.asList(3,4);
}
public static <U1,U2,R> java.util.function.BiFunction<EvalTValue<U1>,EvalTValue<U2>,EvalTValue<R>> lift2(java.util.function.BiFunction<? super U1,? super U2,? extends R> fn)
{
@code
BiFunction add = (a, b) -> a + b;
BiFunction, MaybeT, MaybeT> optTAdd2 = MaybeT.lift2(add);
Stream withNulls = Stream.of(1, 2, null);
AnyMValue stream = AnyM.ofMonad(withNulls);
AnyMValue> streamOpt = stream.map(Maybe::ofNullable);
CompletableFuture> two = CompletableFuture.supplyAsync(() -> Maybe.of(2));
AnyMValue> future = AnyM.ofMonad(two);
List results = optTAdd2.apply(MaybeT.of(streamOpt), MaybeT.of(future)).unwrap()
.>> unwrap().filter(Maybe::isPresent).map(Maybe::get)
.collect(Collectors.toList());
// Arrays.asList(3,4);
}
public static <A> EvalTValue<A> fromAnyM(AnyMValue<A> anyM)
anyM - AnyM that doesn't contain a monad wrapping an Maybepublic static <A> EvalTValue<A> of(AnyMValue<Eval<A>> monads)
monads - AnyM that contains a monad wrapping an Maybepublic static <A,V extends MonadicValue<Eval<A>>> EvalTValue<A> fromValue(V monadicValue)
public java.lang.String toString()
toString in class java.lang.Objectpublic T get()
get in interface Convertable<T>get in interface java.util.function.Supplier<T>public boolean isValuePresent()
isValuePresent in interface TransformerValue<T>public ReactiveSeq<T> stream()
public java.util.Iterator<T> iterator()
iterator in interface Matchable.MatchableOptional<T>iterator in interface Matchable.ValueAndOptionalMatcher<T>iterator in interface Convertable<T>iterator in interface ToStream<T>iterator in interface java.lang.Iterable<T>public void subscribe(org.reactivestreams.Subscriber<? super T> s)
public boolean test(T t)
public <R> EvalTValue<R> unit(R value)
public <R> EvalTValue<R> empty()
public static <T> EvalTValue<T> of(Eval<T> eval)
public static <T> EvalTValue<T> emptyMaybe()
emptyMaybe in interface EvalT<T>public <U> EvalTValue<U> cast(java.lang.Class<? extends U> type)
FunctorClassCastException.
// ClassCastException ReactiveSeq.of(1, "a", 2, "b", 3).cast(Integer.class)public <R> EvalTValue<R> trampoline(java.util.function.Function<? super T,? extends Trampoline<? extends R>> mapper)
Functor
ReactiveSeq.of(10,20,30,40)
.trampoline(i-> fibonacci(i))
.forEach(System.out::println);
Trampoline<Long> fibonacci(int i){
return fibonacci(i,1,0);
}
Trampoline<Long> fibonacci(int n, long a, long b) {
return n == 0 ? Trampoline.done(b) : Trampoline.more( ()->fibonacci(n-1, a+b, a));
}
55
6765
832040
102334155
ReactiveSeq.of(10_000,200_000,3_000_000,40_000_000)
.trampoline(i-> fibonacci(i))
.forEach(System.out::println);
completes successfully
trampoline in interface EvalT<T>trampoline in interface TransformerValue<T>trampoline in interface Functor<T>public <R> EvalTValue<R> patternMatch(java.util.function.Function<Matchable.CheckValue1<T,R>,Matchable.CheckValue1<T,R>> case1, java.util.function.Supplier<? extends R> otherwise)
Functor
List<String> result = CollectionX.of(1,2,3,4)
.patternMatch(
c->c.valuesWhere(i->"even", (Integer i)->i%2==0 )
)
// CollectionX["odd","even","odd","even"]
patternMatch in interface EvalT<T>patternMatch in interface TransformerValue<T>patternMatch in interface Functor<T>case1 - Function to generate a case (or chain of cases as a single case)otherwise - Value if supplied case doesn't matchpublic <U> MaybeTValue<U> ofType(java.lang.Class<? extends U> type)
Filterable
// (1, 2, 3) ReactiveSeq.of(1, "a", 2, "b",3).ofType(Integer.class)
public MaybeTValue<T> filterNot(java.util.function.Predicate<? super T> fn)
Filterable
of(1,2,3).filter(i->i>2);
//[1,2]
public MaybeTValue<T> notNull()
Filterable
of(1,2,null,4).nonNull();
//[1,2,4]