Package org.apache.commons.collections4.functors

Class PredicateTransformer<T>

java.lang.Object

org.apache.commons.collections4.functors.PredicateTransformer<T>

Type Parameters:

T - the type of the input and result to the function.

All Implemented Interfaces:

Serializable, Function<T,Boolean>, Transformer<T,Boolean>

public class PredicateTransformer<T>
extends Object
implements Transformer<T,Boolean>, Serializable

Transformer implementation that calls a Predicate using the input object and then returns the result.

Since:

3.0

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
PredicateTransformer(Predicate<? super T> predicate)	Constructor that performs no validation.

Method Summary

Modifier and Type	Method	Description
Predicate<? super T>	getPredicate()	Gets the predicate.
static <T> Transformer<T,Boolean>	predicateTransformer(Predicate<? super T> predicate)	Factory method that performs validation.
Boolean	transform(T input)	Transforms the input to result by calling a predicate.

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, compose

Methods inherited from interface org.apache.commons.collections4.Transformer

apply

Constructor Details

PredicateTransformer

public PredicateTransformer(Predicate<? super T> predicate)

Constructor that performs no validation. Use predicateTransformer if you want that.

Parameters:

predicate - the predicate to call, not null

Method Details

predicateTransformer

public static <T> Transformer<T,Boolean> predicateTransformer(Predicate<? super T> predicate)

Factory method that performs validation.

Type Parameters:

T - the input type

Parameters:

predicate - the predicate to call, not null

Returns:

the predicate transformer

Throws:

IllegalArgumentException - if the predicate is null

getPredicate

public Predicate<? super T> getPredicate()

Gets the predicate.

Returns:

the predicate

Since:

3.1

transform

public Boolean transform(T input)

Transforms the input to result by calling a predicate.

Specified by:

transform in interface Transformer<T,Boolean>

Parameters:

input - the input object to transform

Returns:

the transformed result