com.neurosys.etl.common.transformers

Class IterableElementIndexTransformer

java.lang.Object

com.neurosys.etl.common.transformers.IterableElementIndexTransformer

All Implemented Interfaces:

Lookup, org.apache.commons.collections.Transformer

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

For a Iterable [B,A,C,B] return a Map of Position of the elements in the index {B:0, A:1, C:2}
If an Element is repeated and trackMultipleIndeces is false; the last encountered index will be the one that is counted.
If trackMultipleIndeces is true then [B,A,C,B] --> {B:[0,3], A:[1], C:[2]} will be returned


This works for any Iterable input however the order relies on assumption that the input has a consistent order. In practice this is safest to use with List's

Author:

Arjun Dhar TODO: Add to Unit test case

Constructor Summary

Constructors

Constructor and Description
IterableElementIndexTransformer()

Method Summary

Modifier and Type	Method and Description
boolean	isTrackMultipleIndeces() If true, will return a Map with List of indeces for each element
void	setTrackMultipleIndeces(boolean trackMultipleIndeces) If true, will return a Map with List of indeces for each element
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

IterableElementIndexTransformer

public IterableElementIndexTransformer()

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

isTrackMultipleIndeces

public boolean isTrackMultipleIndeces()

If true, will return a Map with List of indeces for each element

Default value:

false

setTrackMultipleIndeces

public void setTrackMultipleIndeces(boolean trackMultipleIndeces)

If true, will return a Map with List of indeces for each element

Default value:

false