com.neurosys.etl.common

Class ExistingEntityLookup<T>

java.lang.Object

com.neurosys.etl.common.ExistingEntityMergeTransformer<T>

com.neurosys.etl.common.ExistingEntityLookup<T>

Type Parameters:

T -

All Implemented Interfaces:

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

Direct Known Subclasses:

DefaultExistingEntityLookup, ExistingAreaLookup, ExistingProductLookup

public abstract class ExistingEntityLookup<T>
extends ExistingEntityMergeTransformer<T>
implements Lookup, ModeAware

Check to see if an Entity already exists, and if so load (and update) it; based on various other settings provided by this class.
This also supports Future Lookups, i.e. if while processing we realize that the Entity may exist but is not currently provided and want to postpone the processing for future.

Author:

Arjun Dhar

Field Summary

Fields

Modifier and Type	Field and Description
protected Mode	mode
protected boolean	postponseLookup If true, will throw a RequireLookAheadException instead of a null when an Entity is not found.

Fields inherited from class com.neurosys.etl.common.ExistingEntityMergeTransformer

customMergeActions, fieldNamesToMerge, ignoreNullsForPrimitiveTypes, immutableFieldNames, mergeFieldMode, typesRequireDeepCopy

Constructor Summary

Constructors

Constructor and Description
ExistingEntityLookup()
ExistingEntityLookup(ExistingEntityMergeTransformer t)

Method Summary

Modifier and Type	Method and Description
protected abstract T	getEntity(T in) Core method to identify and fetch the record that matches the record It will return null if not an existing record or an Exception in case there is any problem in trying to figure it out
Mode	getMode() The processing logic of the Reader may differ based n the fact it is intended to Update or Insert or Delete
List<Mode>	getModesSupported() Get the Modes supported by the instance
boolean	isPostponseLookup() If true, will throw a RequireLookAheadException instead of a null when an Entity is not found.
void	setMode(Mode mode)
void	setPostponseLookup(boolean postponseLookup) If true, will throw a RequireLookAheadException instead of a null when an Entity is not found.
Object	transform(Object in) For a Given String, Lookup a value for it

Methods inherited from class com.neurosys.etl.common.ExistingEntityMergeTransformer

copy, copySpecificTypes, getClosestParent, getCustomMergeAction, getCustomMergeActions, getFieldNamesToMerge, getIdentityFieldNames, getIdFieldsForClass, getImmutableFieldNames, getImmutableFieldsForClass, getTypesRequireDeepCopy, isIgnoreNullsForPrimitiveTypes, isMergeFieldMode, isMutable, isMutablePrimitive, isValidOrPrimitiveFieldType, mergeFields, requiredDeepCopy, setCustomMergeActions, setFieldNamesToMerge, setIdentityFieldNames, setIgnoreNullsForPrimitiveTypes, setImmutableFieldNames, setMergeFieldMode, setTypesRequireDeepCopy, treatNewEntity

Methods inherited from class java.lang.Object

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

Field Detail

postponseLookup

protected boolean postponseLookup

If true, will throw a RequireLookAheadException instead of a null when an Entity is not found.

mode

protected Mode mode

Constructor Detail

ExistingEntityLookup

public ExistingEntityLookup()

ExistingEntityLookup

public ExistingEntityLookup(ExistingEntityMergeTransformer t)

Method Detail

getEntity

protected abstract T getEntity(T in)
                        throws Exception

Core method to identify and fetch the record that matches the record
It will return null if not an existing record or an Exception in case there is any problem in trying to figure it out

Parameters:

in -

Returns:

null if not an existing record

Throws:

Exception

transform

public Object transform(Object in)

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

Overrides:

transform in class ExistingEntityMergeTransformer<T>

isPostponseLookup

public boolean isPostponseLookup()

If true, will throw a RequireLookAheadException instead of a null when an Entity is not found.

setPostponseLookup

public void setPostponseLookup(boolean postponseLookup)

If true, will throw a RequireLookAheadException instead of a null when an Entity is not found.

getMode

public Mode getMode()

Description copied from interface: ModeAware

The processing logic of the Reader may differ based n the fact it is intended to Update or Insert or Delete

Specified by:

getMode in interface ModeAware

See Also:

Mode

setMode

public void setMode(Mode mode)

Specified by:

setMode in interface ModeAware

getModesSupported

public List<Mode> getModesSupported()

Description copied from interface: ModeAware

Get the Modes supported by the instance

Specified by:

getModesSupported in interface ModeAware

Returns: