Package org.apache.commons.collections4.functors

Class IfClosure<E>

java.lang.Object

org.apache.commons.collections4.functors.IfClosure<E>

All Implemented Interfaces:

java.io.Serializable, Closure<E>

public class IfClosure<E>
extends java.lang.Object
implements Closure<E>, java.io.Serializable

Closure implementation acts as an if statement calling one or other closure based on a predicate.

Since:

3.0

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
IfClosure(Predicate<? super E> predicate, Closure<? super E> trueClosure)	Constructor that performs no validation.
IfClosure(Predicate<? super E> predicate, Closure<? super E> trueClosure, Closure<? super E> falseClosure)	Constructor that performs no validation.

Method Summary

Modifier and Type	Method	Description
void	execute(E input)	Executes the true or false closure according to the result of the predicate.
Closure<? super E>	getFalseClosure()	Gets the closure called when false.
Predicate<? super E>	getPredicate()	Gets the predicate.
Closure<? super E>	getTrueClosure()	Gets the closure called when true.
static <E> Closure<E>	ifClosure(Predicate<? super E> predicate, Closure<? super E> trueClosure)	Factory method that performs validation.
static <E> Closure<E>	ifClosure(Predicate<? super E> predicate, Closure<? super E> trueClosure, Closure<? super E> falseClosure)	Factory method that performs validation.

Methods inherited from class java.lang.Object

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

Constructor Detail

IfClosure

public IfClosure(Predicate<? super E> predicate,
                 Closure<? super E> trueClosure)

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

This constructor creates a closure that performs no action when the predicate is false.

Parameters:

predicate - predicate to switch on, not null

trueClosure - closure used if true, not null

Since:

3.2

IfClosure

public IfClosure(Predicate<? super E> predicate,
                 Closure<? super E> trueClosure,
                 Closure<? super E> falseClosure)

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

Parameters:

predicate - predicate to switch on, not null

trueClosure - closure used if true, not null

falseClosure - closure used if false, not null

Method Detail

ifClosure

public static <E> Closure<E> ifClosure(Predicate<? super E> predicate,
                                       Closure<? super E> trueClosure)

Factory method that performs validation.

This factory creates a closure that performs no action when the predicate is false.

Type Parameters:

E - the type that the closure acts on

Parameters:

predicate - predicate to switch on

trueClosure - closure used if true

Returns:

the if closure

Throws:

java.lang.NullPointerException - if either argument is null

Since:

3.2

ifClosure

public static <E> Closure<E> ifClosure(Predicate<? super E> predicate,
                                       Closure<? super E> trueClosure,
                                       Closure<? super E> falseClosure)

Factory method that performs validation.

Type Parameters:

E - the type that the closure acts on

Parameters:

predicate - predicate to switch on

trueClosure - closure used if true

falseClosure - closure used if false

Returns:

the if closure

Throws:

java.lang.NullPointerException - if any argument is null

execute

public void execute(E input)

Executes the true or false closure according to the result of the predicate.

Specified by:

execute in interface Closure<E>

Parameters:

input - the input object

getPredicate

public Predicate<? super E> getPredicate()

Gets the predicate.

Returns:

the predicate

Since:

3.1

getTrueClosure

public Closure<? super E> getTrueClosure()

Gets the closure called when true.

Returns:

the closure

Since:

3.1

getFalseClosure

public Closure<? super E> getFalseClosure()

Gets the closure called when false.

Returns:

the closure

Since:

3.1