MapTransformer (Commons Collections 3.2.2 API)

java.lang.Object
- org.apache.commons.collections.functors.MapTransformer

All Implemented Interfaces:

Serializable, Transformer
```
public final class MapTransformer
extends Object
implements Transformer, Serializable
```
Transformer implementation that returns the value held in a specified map using the input parameter as a key.

Since:

Commons Collections 3.0

Version:

$Revision: 646777 $ $Date: 2008-04-10 14:33:15 +0200 (Thu, 10 Apr 2008) $

Author:

Stephen Colebourne

See Also:

Serialized Form

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`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`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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