Package org.apache.commons.collections4.functors

Class NOPTransformer<T>

java.lang.Object

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

Type Parameters:

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

All Implemented Interfaces:

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

public class NOPTransformer<T>
extends Object
implements Transformer<T,T>, Serializable

Transformer implementation that does nothing.

Since:

3.0

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
static final Transformer	INSTANCE	Singleton predicate instance
private static final long	serialVersionUID	Serial version UID

Constructor Summary

Constructors

Modifier	Constructor	Description
private	NOPTransformer()	Constructs a new instance.

Method Summary

Modifier and Type	Method	Description
static <T> Transformer<T,T>	nopTransformer()	Factory returning the singleton instance.
private Object	readResolve()	Returns the singleton instance.
T	transform(T input)	Transforms the input to result by doing nothing.

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

Field Details

serialVersionUID

private static final long serialVersionUID

Serial version UID

See Also:

• Constant Field Values

INSTANCE

public static final Transformer INSTANCE

Singleton predicate instance

Constructor Details

NOPTransformer

private NOPTransformer()

Constructs a new instance.

Method Details

nopTransformer

public static <T> Transformer<T,T> nopTransformer()

Factory returning the singleton instance.

Type Parameters:

T - the input/output type

Returns:

the singleton instance

Since:

3.1

readResolve

private Object readResolve()

Returns the singleton instance.

Returns:

the singleton instance.

transform

public T transform(T input)

Transforms the input to result by doing nothing.

Specified by:

transform in interface Transformer<T,T>

Parameters:

input - the input object to transform

Returns:

the transformed result which is the input