org.apache.commons.collections4.functors

Class ChainedTransformer<T>

java.lang.Object

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

All Implemented Interfaces:

java.io.Serializable, Transformer<T,T>

public class ChainedTransformer<T>
extends java.lang.Object
implements Transformer<T,T>, java.io.Serializable

Transformer implementation that chains the specified transformers together.

The input object is passed to the first transformer. The transformed result is passed to the second transformer and so on.

Since:

3.0

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ChainedTransformer(Transformer<? super T,? extends T>... transformers) Constructor that performs no validation.

Method Summary

Modifier and Type	Method and Description
static <T> Transformer<T,T>	chainedTransformer(java.util.Collection<? extends Transformer<? super T,? extends T>> transformers) Create a new Transformer that calls each transformer in turn, passing the result into the next transformer.
static <T> Transformer<T,T>	chainedTransformer(Transformer<? super T,? extends T>... transformers) Factory method that performs validation and copies the parameter array.
Transformer<? super T,? extends T>[]	getTransformers() Gets the transformers.
T	transform(T object) Transforms the input to result via each decorated transformer

Methods inherited from class java.lang.Object

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

Constructor Detail

ChainedTransformer

public ChainedTransformer(Transformer<? super T,? extends T>... transformers)

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

Parameters:

transformers - the transformers to chain, copied, no nulls

Method Detail

chainedTransformer

public static <T> Transformer<T,T> chainedTransformer(Transformer<? super T,? extends T>... transformers)

Factory method that performs validation and copies the parameter array.

Type Parameters:

T - the object type

Parameters:

transformers - the transformers to chain, copied, no nulls

Returns:

the chained transformer

Throws:

java.lang.NullPointerException - if the transformers array is null

java.lang.NullPointerException - if any transformer in the array is null

chainedTransformer

public static <T> Transformer<T,T> chainedTransformer(java.util.Collection<? extends Transformer<? super T,? extends T>> transformers)

Create a new Transformer that calls each transformer in turn, passing the result into the next transformer. The ordering is that of the iterator() method on the collection.

Type Parameters:

T - the object type

Parameters:

transformers - a collection of transformers to chain

Returns:

the chained transformer

Throws:

java.lang.NullPointerException - if the transformers collection is null

java.lang.NullPointerException - if any transformer in the collection is null

transform

public T transform(T object)

Transforms the input to result via each decorated transformer

Specified by:

transform in interface Transformer<T,T>

Parameters:

object - the input object passed to the first transformer

Returns:

the transformed result

getTransformers

public Transformer<? super T,? extends T>[] getTransformers()

Gets the transformers.

Returns:

a copy of the transformers

Since:

3.1