org.apache.commons.collections4.functors

Class ChainedTransformer<T>

  • All Implemented Interfaces:
    Serializable, Transformer<T,T> 

    public class ChainedTransformer<T>
extends Object
implements Transformer<T,T>, 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 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:
        NullPointerException - if the transformers array is null
        NullPointerException - if any transformer in the array is null

      • chainedTransformer

        public static <T> Transformer<T,T> chainedTransformer(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:
        NullPointerException - if the transformers collection is null
        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