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Java8.java
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165 lines (128 loc) · 4.89 KB
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package fj.data;
import java.util.Iterator;
import java.util.Optional;
import java.util.Spliterators;
import java.util.function.BiFunction;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.StreamSupport;
import fj.F;
import fj.F2;
import fj.P;
import fj.P1;
import fj.Try;
import fj.Unit;
import fj.function.Try0;
import fj.function.Try1;
import fj.function.Try2;
/**
* Created by mperry on 3/06/2014.
*/
public final class Java8 {
private Java8() {
throw new UnsupportedOperationException();
}
public static <A> P1<A> Supplier_P1(final Supplier<A> s) {
return P.lazy(s::get);
}
public static <A> F<Supplier<A>, P1<A>> Supplier_P1() {
return Java8::Supplier_P1;
}
public static <A> Supplier<A> P1_Supplier(final P1<A> p) {
return p::_1;
}
public static <A> F<P1<A>, Supplier<A>> P1_Supplier() {
return Java8::P1_Supplier;
}
public static <A, B> F<A, B> Function_F(final Function<A, B> f) {
return f::apply;
}
public static <A, B> F<Function<A, B>, F<A, B>> Function_F() {
return Java8::Function_F;
}
public static <A, B> Function<A, B> F_Function(final F<A, B> f) {
return f::f;
}
public static <A, B> F<F<A, B>, Function<A, B>> F_Function() {
return Java8::F_Function;
}
public static <A, B, C> F2<A, B, C> BiFunction_F2(final BiFunction<A, B, C> f) {
return f::apply;
}
public static <A, B, C> F<BiFunction<A, B, C>, F2<A, B, C>> BiFunction_F2() {
return Java8::BiFunction_F2;
}
public static <A, B, C> BiFunction<A, B, C> F2_BiFunction(final F2<A, B, C> f) {
return f::f;
}
public static <A, B, C> F<F2<A, B, C>, BiFunction<A, B, C>> F2_BiFunction() {
return Java8::F2_BiFunction;
}
public static <A, E extends Exception> Supplier<Validation<E, A>> TryCatch0_Supplier(final Try0<A, E> t) {
return () -> Try.f(t)._1();
}
public static <A, E extends Exception> F<Try0<A, E>, Supplier<Validation<E, A>>> TryCatch0_Supplier() {
return Java8::TryCatch0_Supplier;
}
public static <A, B, E extends Exception> Function<A, Validation<E, B>> TryCatch1_Function(final Try1<A, B, E> t) {
return a -> Try.f(t).f(a);
}
public static <A, B, E extends Exception> F<Try1<A, B, E>, Function<A, Validation<E, B>>> TryCatch1_Function() {
return Java8::TryCatch1_Function;
}
public static <A, B, C, E extends Exception> BiFunction<A, B, Validation<E, C>> TryCatch2_BiFunction(final Try2<A, B, C, E> t) {
return (a, b) -> Try.f(t).f(a, b);
}
public static <A, B, C, E extends Exception> F<Try2<A, B, C, E>, BiFunction<A, B, Validation<E, C>>> TryCatch2_BiFunction() {
return Java8::TryCatch2_BiFunction;
}
public static <A> java.util.stream.Stream<A> List_JavaStream(final List<A> list) {
return Iterable_JavaStream(list);
}
public static <A> Option<A> Optional_Option(final Optional<A> o) {
return o.isPresent() ? Option.some(o.get()) : Option.none();
}
public static <A> F<Optional<A>, Option<A>> Optional_Option() {
return Java8::Optional_Option;
}
/**
* Convert an Option to {@link Optional}. Will throw a {@link NullPointerException} if the Option is some(null).
*/
public static <A> Optional<A> Option_Optional(final Option<A> o) {
return o.option(Optional.empty(), Optional::of);
}
public static <A> F<Option<A>, Optional<A>> Option_Optional() {
return Java8::Option_Optional;
}
public static <A> F<Consumer<A>, F<A, Unit>> Consumer_F() {
return Java8::Consumer_F;
}
public static <A> F<A, Unit> Consumer_F(final Consumer<A> c) {
return a -> {
c.accept(a);
return Unit.unit();
};
}
public static <A> java.util.stream.Stream<A> Stream_JavaStream(final fj.data.Stream<A> s) {
return Iterable_JavaStream(s);
}
public static <A> java.util.stream.Stream<A> Iterable_JavaStream(final Iterable<A> it) {
return StreamSupport.stream(it.spliterator(), false);
}
public static <A> java.util.stream.Stream<A> Iterator_JavaStream(final Iterator<A> it) {
return StreamSupport.stream(Spliterators.spliteratorUnknownSize(it, 0), false);
}
public static <A> F<fj.data.Stream<A>, java.util.stream.Stream<A>> Stream_JavaStream() {
return Java8::Stream_JavaStream;
}
public static <A> Stream<A> JavaStream_Stream(final java.util.stream.Stream<A> s) {
return Stream.iteratorStream(s.iterator());
}
public static <A> List<A> JavaStream_List(final java.util.stream.Stream<A> s) {
return s.collect(Collectors.toList());
}
public static <A> Array<A> JavaStream_Array(final java.util.stream.Stream<A> s) {
return s.collect(Collectors.toArray());
}
}