de.gerdiproject.harvest.etls.transformers

Interface ITransformer<T,S>

Type Parameters:

T - the type of objects that are to be transformed

S - the resulting type of the transformed objects

All Known Implementing Classes:

AbstractIteratorTransformer

public interface ITransformer<T,S>

This class represents the Transformer of an ETL process.

Author:

Robin Weiss

Method Summary

Modifier and Type	Method and Description
void	clear() Closes potentially open readers/writers and finishes the Transformation process if it is still ongoing.
void	init(AbstractETL<?,?> etl) Initializes the transformer for a new harvest.
S	transform(T source) Transforms an extracted element to a document that can be loaded.

Method Detail

init

void init(AbstractETL<?,?> etl)

Initializes the transformer for a new harvest.

Parameters:

etl - the AbstractETL to which the transformer belongs

transform

S transform(T source)
     throws TransformerException

Transforms an extracted element to a document that can be loaded.

Parameters:

source - an extracted element

Returns:

a document that can be loaded

Throws:

TransformerException - thrown when an element cannot be transformed

clear

void clear()

Closes potentially open readers/writers and finishes the Transformation process if it is still ongoing.