Module org.apache.commons.collections4
Package org.apache.commons.collections4.functors

Class MapTransformer<I,O>

java.lang.Object
org.apache.commons.collections4.functors.MapTransformer<I,O>
All Implemented Interfaces:
Serializable, Transformer<I,O>
public final class MapTransformer<I,O> extends Object implements Transformer<I,O>, Serializable
Transformer implementation that returns the value held in a specified map using the input parameter as a key.
Since:
3.0
See Also:

  • Method Details

    • mapTransformer

      public static <I, O> Transformer<I,O> mapTransformer(Map<? super I,? extends O> map)
      Factory to create the transformer.

      If the map is null, a transformer that always returns null is returned.

      Type Parameters:
      I - the input type
      O - the output type
      Parameters:
      map - the map, not cloned
      Returns:
      the transformer

    • transform

      public O transform(I input)
      Transforms the input to result by looking it up in a Map.
      Specified by:
      transform in interface Transformer<I,O>
      Parameters:
      input - the input object to transform
      Returns:
      the transformed result

    • getMap

      public Map<? super I,? extends O> getMap()
      Gets the map to lookup in.
      Returns:
      the map
      Since:
      3.1