com.neurosys.etl.common.transformers

Class MapValueLookupTransformer

java.lang.Object

com.neurosys.etl.common.transformers.MapValueLookupTransformer

All Implemented Interfaces:

AccessorLookUp, Lookup, org.apache.commons.collections.Transformer

public class MapValueLookupTransformer
extends Object
implements Lookup, org.apache.commons.collections.Transformer, AccessorLookUp

For a key key-map (key) fetch the value using the input as a key OR For a passed in Map, lookup a Key
One can optionally apply a transformation on the looked up value or even a keyTransformer on the key to derive the final key value to do the lookup.

Author:

Arjun Dhar TODO: Add Unit test case

Constructor Summary

Constructors

Constructor and Description
MapValueLookupTransformer()
MapValueLookupTransformer(Object key)

Method Summary

Modifier and Type	Method and Description
Object	get(Object entity, Object key)
Object	getKey() A key value or a Map
org.apache.commons.collections.Transformer	getKeyTransformer() Key Transformer
org.apache.commons.collections.Transformer	getNoKeyReturn() If while looking up, the final generated or passed key does not exist in the Map, then apply this over the input. If null (by default), will return null.
org.apache.commons.collections.Transformer	getTransformer() Value Transformer
void	setKey(Object key) A key value or a Map
void	setKeyTransformer(org.apache.commons.collections.Transformer keyTransformer) Key Transformer
void	setNoKeyReturn(org.apache.commons.collections.Transformer noKeyReturn) If while looking up, the final generated or passed key does not exist in the Map, then apply this over the input. If null (by default), will return null.
void	setTransformer(org.apache.commons.collections.Transformer transformer) Value Transformer
Object	transform(Object input) For a Given String, Lookup a value for it

Methods inherited from class java.lang.Object

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

Constructor Detail

MapValueLookupTransformer

public MapValueLookupTransformer()

MapValueLookupTransformer

public MapValueLookupTransformer(Object key)

Method Detail

transform

public Object transform(Object input)

Description copied from interface: Lookup

For a Given String, Lookup a value for it

Specified by:

transform in interface Lookup

Specified by:

transform in interface org.apache.commons.collections.Transformer

get

public Object get(Object entity,
                  Object key)
           throws Exception

Specified by:

get in interface AccessorLookUp

Parameters:

entity - as Entity to be looked up

key - to lookup the entity

Returns:

Object

Throws:

Exception

getKey

public Object getKey()

A key value or a Map

setKey

public void setKey(Object key)

A key value or a Map

getTransformer

public org.apache.commons.collections.Transformer getTransformer()

Value Transformer

Can be null:

true

setTransformer

public void setTransformer(org.apache.commons.collections.Transformer transformer)

Value Transformer

Can be null:

true

getKeyTransformer

public org.apache.commons.collections.Transformer getKeyTransformer()

Key Transformer

Can be null:

true

setKeyTransformer

public void setKeyTransformer(org.apache.commons.collections.Transformer keyTransformer)

Key Transformer

Can be null:

true

getNoKeyReturn

public org.apache.commons.collections.Transformer getNoKeyReturn()

If while looking up, the final generated or passed key does not exist in the Map, then apply this over the input.
If null (by default), will return null.

Default value:

null

setNoKeyReturn

public void setNoKeyReturn(org.apache.commons.collections.Transformer noKeyReturn)

If while looking up, the final generated or passed key does not exist in the Map, then apply this over the input.
If null (by default), will return null.

Default value:

null