Package org.apache.commons.collections4.functors

Class TransformedPredicate<T>

java.lang.Object

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

All Implemented Interfaces:

java.io.Serializable, PredicateDecorator<T>, Predicate<T>

public final class TransformedPredicate<T>
extends java.lang.Object
implements PredicateDecorator<T>, java.io.Serializable

Predicate implementation that transforms the given object before invoking another Predicate.

Since:

3.1

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
TransformedPredicate(Transformer<? super T,? extends T> transformer, Predicate<? super T> predicate)	Constructor that performs no validation.

Method Summary

Modifier and Type	Method	Description
boolean	evaluate(T object)	Evaluates the predicate returning the result of the decorated predicate once the input has been transformed
Predicate<? super T>[]	getPredicates()	Gets the predicate being decorated.
Transformer<? super T,? extends T>	getTransformer()	Gets the transformer in use.
static <T> Predicate<T>	transformedPredicate(Transformer<? super T,? extends T> transformer, Predicate<? super T> predicate)	Factory to create the predicate.

Methods inherited from class java.lang.Object

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

Constructor Detail

TransformedPredicate

public TransformedPredicate(Transformer<? super T,? extends T> transformer,
                            Predicate<? super T> predicate)

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

Parameters:

transformer - the transformer to use

predicate - the predicate to decorate

Method Detail

transformedPredicate

public static <T> Predicate<T> transformedPredicate(Transformer<? super T,? extends T> transformer,
                                                    Predicate<? super T> predicate)

Factory to create the predicate.

Type Parameters:

T - the type that the predicate queries

Parameters:

transformer - the transformer to call

predicate - the predicate to call with the result of the transform

Returns:

the predicate

Throws:

java.lang.NullPointerException - if the transformer or the predicate is null

evaluate

public boolean evaluate(T object)

Evaluates the predicate returning the result of the decorated predicate once the input has been transformed

Specified by:

evaluate in interface Predicate<T>

Parameters:

object - the input object which will be transformed

Returns:

true if decorated predicate returns true

getPredicates

public Predicate<? super T>[] getPredicates()

Gets the predicate being decorated.

Specified by:

getPredicates in interface PredicateDecorator<T>

Returns:

the predicate as the only element in an array

Since:

3.1

getTransformer

public Transformer<? super T,? extends T> getTransformer()

Gets the transformer in use.

Returns:

the transformer