com.neurosys.etl.common.transformers

Class AbstractEntityToTupleTransformer<ENTITY,TUPLE>

java.lang.Object

com.neurosys.etl.process.EventAwareProcess

com.neurosys.etl.common.transformers.AbstractEntityTransformer<ENTITY,Object,TUPLE>

com.neurosys.etl.common.transformers.AbstractEntityToTupleTransformer<ENTITY,TUPLE>

All Implemented Interfaces:

IdempotentAware, ModeAware, Process, Serializable, org.apache.commons.collections.Transformer

Direct Known Subclasses:

AbstractReverseTupleToEntityTransformer, EntityToListTransformer, EntityToObjectArrayTransformer

public abstract class AbstractEntityToTupleTransformer<ENTITY,TUPLE>
extends AbstractEntityTransformer<ENTITY,Object,TUPLE>

Converts an Entity to a Tuple. Where an entity does not have any concept of ordering and just fields, while a Tuple is an ordered list of values (like an Array or List)

Author:

Arjun Dhar

See Also:

Must call init if not used via Spring, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.neurosys.etl.process.Process

Process.Event, Process.EventPoint

Field Summary

Fields inherited from class com.neurosys.etl.common.transformers.AbstractEntityTransformer

columnFieldMapping, idempotent, mode, modesSupported, nestedObjectInitMap, nonAssociatedMappers

Fields inherited from class com.neurosys.etl.process.EventAwareProcess

listeners, processState

Constructor Summary

Constructors

Constructor and Description
AbstractEntityToTupleTransformer()
AbstractEntityToTupleTransformer(AbstractEntityToTupleTransformer t)

Method Summary

Modifier and Type	Method and Description
List<String>	getColumnNames() Useful function to derive All Columns in the report
protected String	identifyNode(Object node) Identify a node/cell that is being processed.
protected abstract TUPLE	init(ENTITY rawInput, Map<String,Object> intermediateObjects) Create the core Entity and also initialize intermediateObjects (nested objects) with core entities
protected abstract void	setEntity(TUPLE tuple, Mapper mapper, Object value) Reverse of SetEntity actually, setting the value to a given position in the Tuple for Mapper.getFieldName() != null (I.e concrete Output fields)
Object	transform(Object input) Work Horse method that does all the conversion using Mappers.

Methods inherited from class com.neurosys.etl.common.transformers.AbstractEntityTransformer

consumeIntermediateObjects, getColumnFieldMapping, getEntityAccessTransformer, getMode, getModesSupported, getNestedObjectInitMap, getNonAssiciatedMappers, getNonAssociatedMappers, getValue, init, isIdempotent, nestedInit, processValue, setColumnFieldMapping, setEntityAccessTransformer, setIdempotent, setMode, setModesSupported, setNestedObjectInitMap, setNonAssociatedMappers

Methods inherited from class com.neurosys.etl.process.EventAwareProcess

addListener, getListeners, onChangeHandler, setListeners

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractEntityToTupleTransformer

public AbstractEntityToTupleTransformer()

AbstractEntityToTupleTransformer

public AbstractEntityToTupleTransformer(AbstractEntityToTupleTransformer t)

Method Detail

identifyNode

protected String identifyNode(Object node)

Description copied from class: AbstractEntityTransformer

Identify a node/cell that is being processed. Used for Log and debug purposes.

Specified by:

identifyNode in class AbstractEntityTransformer<ENTITY,Object,TUPLE>

Returns:

String

getColumnNames

public List<String> getColumnNames()

Useful function to derive All Columns in the report

init

protected abstract TUPLE init(ENTITY rawInput,
                              Map<String,Object> intermediateObjects)

Create the core Entity and also initialize intermediateObjects (nested objects) with core entities

Specified by:

init in class AbstractEntityTransformer<ENTITY,Object,TUPLE>

intermediateObjects - the Map into which we can pre-initialize stuff

Returns:

entity object

setEntity

protected abstract void setEntity(TUPLE tuple,
                                  Mapper mapper,
                                  Object value)
                           throws Exception

Reverse of SetEntity actually, setting the value to a given position in the Tuple for Mapper.getFieldName() != null (I.e concrete Output fields)

Overrides:

setEntity in class AbstractEntityTransformer<ENTITY,Object,TUPLE>

mapper - as Mapper for MapperBehaviors and Mapper.getFieldName()

Throws:

Exception - TODO: Add unit test case, for an Entity with Integer field type but passing Double field value

transform

public Object transform(Object input)

Work Horse method that does all the conversion using Mappers.
Mapping involved One-to-One mapping or mapping Hypothetical variables in the source to real ones in persistence.