Class FunctorUtils
- java.lang.Object
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- org.apache.commons.collections4.functors.FunctorUtils
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class FunctorUtils extends java.lang.Object
Internal utilities for functors.- Since:
- 3.0
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Constructor Summary
Constructors Modifier Constructor Description private
FunctorUtils()
Restricted constructor.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description (package private) static <T> Closure<T>
coerce(Closure<? super T> closure)
A very simple method that coerces Closure super T> to Closure. (package private) static <T> Predicate<T>
coerce(Predicate<? super T> predicate)
A very simple method that coerces Predicate super T> to Predicate. (package private) static <I,O>
Transformer<I,O>coerce(Transformer<? super I,? extends O> transformer)
A very simple method that coerces Transformer super I, ? extends O> to Transformer.(package private) static <E> Closure<E>[]
copy(Closure<? super E>... closures)
Clone the closures to ensure that the internal reference can't be messed with.(package private) static <T> Predicate<T>[]
copy(Predicate<? super T>... predicates)
Clone the predicates to ensure that the internal reference can't be messed with.(package private) static <I,O>
Transformer<I,O>[]copy(Transformer<? super I,? extends O>... transformers)
Copy method(package private) static <T> Predicate<? super T>[]
validate(java.util.Collection<? extends Predicate<? super T>> predicates)
Validate the predicates to ensure that all is well.(package private) static void
validate(Closure<?>... closures)
Validate the closures to ensure that all is well.(package private) static void
validate(Predicate<?>... predicates)
Validate the predicates to ensure that all is well.(package private) static void
validate(Transformer<?,?>... transformers)
Validate method
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Method Detail
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copy
static <T> Predicate<T>[] copy(Predicate<? super T>... predicates)
Clone the predicates to ensure that the internal reference can't be messed with. Due to thePredicate#evaluate(T)
method, Predicate super T> is able to be coerced to Predicatewithout casting issues. - Parameters:
predicates
- the predicates to copy- Returns:
- the cloned predicates
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coerce
static <T> Predicate<T> coerce(Predicate<? super T> predicate)
A very simple method that coerces Predicate super T> to Predicate. Due to the Predicate#evaluate(T)
method, Predicate super T> is able to be coerced to Predicatewithout casting issues. This method exists simply as centralised documentation and atomic unchecked warning suppression.
- Type Parameters:
T
- the type of object the returned predicate should "accept"- Parameters:
predicate
- the predicate to coerce.- Returns:
- the coerced predicate.
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validate
static void validate(Predicate<?>... predicates)
Validate the predicates to ensure that all is well.- Parameters:
predicates
- the predicates to validate
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validate
static <T> Predicate<? super T>[] validate(java.util.Collection<? extends Predicate<? super T>> predicates)
Validate the predicates to ensure that all is well.- Parameters:
predicates
- the predicates to validate- Returns:
- predicate array
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copy
static <E> Closure<E>[] copy(Closure<? super E>... closures)
Clone the closures to ensure that the internal reference can't be messed with.- Parameters:
closures
- the closures to copy- Returns:
- the cloned closures
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validate
static void validate(Closure<?>... closures)
Validate the closures to ensure that all is well.- Parameters:
closures
- the closures to validate
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coerce
static <T> Closure<T> coerce(Closure<? super T> closure)
A very simple method that coerces Closure super T> to Closure. This method exists simply as centralised documentation and atomic unchecked warning suppression.
- Type Parameters:
T
- the type of object the returned closure should "accept"- Parameters:
closure
- the closure to coerce.- Returns:
- the coerced closure.
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copy
static <I,O> Transformer<I,O>[] copy(Transformer<? super I,? extends O>... transformers)
Copy method- Parameters:
transformers
- the transformers to copy- Returns:
- a clone of the transformers
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validate
static void validate(Transformer<?,?>... transformers)
Validate method- Parameters:
transformers
- the transformers to validate
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coerce
static <I,O> Transformer<I,O> coerce(Transformer<? super I,? extends O> transformer)
A very simple method that coerces Transformer super I, ? extends O> to Transformer.This method exists simply as centralised documentation and atomic unchecked warning suppression.
- Type Parameters:
I
- the type of object the returned transformer should "accept"O
- the type of object the returned transformer should "produce"- Parameters:
transformer
- the transformer to coerce.- Returns:
- the coerced transformer.
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