Package org.apache.groovy.util

Class Closures

java.lang.Object

org.apache.groovy.util.Closures

public class Closures
extends Object

Helpers that return hybrid one-argument functions which are both Closure and the appropriate java.util.function SAM (Predicate, Function or Consumer).

For variants whose results are only the SAM type, see Lambdas.

Since:

6.0.0

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Closures.ConsumerClosure<T>	Hybrid one-argument function that is both a Closure and a Consumer.
static class	Closures.FunctionClosure<T,R>	Hybrid one-argument function that is both a Closure and a Function.
static class	Closures.PredicateClosure<T>	Hybrid one-argument function that is both a Closure and a Predicate.

Method Summary

Modifier and Type	Method	Description
static <T, P> Closures.ConsumerClosure<T>	curryWith(BiConsumer<? super T,? super P> bc, P p)	Right-partials a BiConsumer and lifts the result into a hybrid usable as both Closure and Consumer.
static <T, P, R> Closures.FunctionClosure<T,R>	curryWith(BiFunction<? super T,? super P,? extends R> bf, P p)	Right-partials a BiFunction and lifts the result into a hybrid usable as both Closure and Function.
static <T, P> Closures.PredicateClosure<T>	curryWith(BiPredicate<? super T,? super P> bp, P p)	Right-partials a BiPredicate and lifts the result into a hybrid usable as both Closure and Predicate.
static <T> Closures.ConsumerClosure<T>	from(Consumer<T> c)	Lifts a Consumer into a hybrid that is also a Closure.
static <T, R> Closures.FunctionClosure<T,R>	from(Function<T,R> f)	Lifts a Function into a hybrid that is also a Closure.
static <T> Closures.PredicateClosure<T>	from(Predicate<T> p)	Lifts a Predicate into a hybrid that is also a Closure.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

from

public static <T> Closures.PredicateClosure<T> from(Predicate<T> p)

Lifts a Predicate into a hybrid that is also a Closure. If p is already a Closures.PredicateClosure it is returned unchanged.

 Predicate<Integer> isEven = n -> n % 2 == 0
 assert [1, 2, 3, 4].findAll(Closures.from(isEven)) == [2, 4]
 

Since:

6.0.0

from

public static <T,
R> Closures.FunctionClosure<T,R> from(Function<T,R> f)

Lifts a Function into a hybrid that is also a Closure. If f is already a Closures.FunctionClosure it is returned unchanged.

Since:

6.0.0

from

public static <T> Closures.ConsumerClosure<T> from(Consumer<T> c)

Lifts a Consumer into a hybrid that is also a Closure. If c is already a Closures.ConsumerClosure it is returned unchanged.

Since:

6.0.0

curryWith

public static <T,
P> Closures.PredicateClosure<T> curryWith(BiPredicate<? super T,? super P> bp,
 P p)

Right-partials a BiPredicate and lifts the result into a hybrid usable as both Closure and Predicate. Equivalent to from(Lambdas.curryWith(bp, p)).

 BiPredicate<Integer,Integer> divisibleBy = (n, d) -> n % d == 0
 assert [1, 2, 3, 4, 5].findAll(curryWith(divisibleBy, 2)) == [2, 4]
 

Since:

6.0.0

curryWith

public static <T,
P,
R> Closures.FunctionClosure<T,R> curryWith(BiFunction<? super T,? super P,? extends R> bf,
 P p)

Right-partials a BiFunction and lifts the result into a hybrid usable as both Closure and Function. Equivalent to from(Lambdas.curryWith(bf, p)).

Since:

6.0.0

curryWith

public static <T,
P> Closures.ConsumerClosure<T> curryWith(BiConsumer<? super T,? super P> bc,
 P p)

Right-partials a BiConsumer and lifts the result into a hybrid usable as both Closure and Consumer. Equivalent to from(Lambdas.curryWith(bc, p)).

Since:

6.0.0