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org.apache.commons.collections.functors

Class MapTransformer

Implemented Interfaces:
Serializable, Transformer
public final class MapTransformer
extends java.lang.Object
implements Transformer, Serializable
Transformer implementation that returns the value held in a specified map using the input parameter as a key.
Version:
$Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
Author:
Stephen Colebourne
Since:
Commons Collections 3.0

Method Summary

static Transformer
getInstance(Map map)
Factory to create the transformer.
Map
getMap()
Gets the map to lookup in.
Object
transform(Object input)
Transforms the input to result by looking it up in a Map.

Method Details

getInstance

public static Transformer getInstance(Map map)
Factory to create the transformer.

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

Parameters:
map - the map, not cloned
Returns:
the transformer

getMap

public Map getMap()
Gets the map to lookup in.
Returns:
the map
Since:
Commons Collections 3.1

transform

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

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