com.neurosys.modules.etl

Class SubTypeInitMapperTransformer<ENTITY>

java.lang.Object

com.neurosys.modules.etl.SubTypeInitMapperTransformer<ENTITY>

Type Parameters:

ENTITY - as type of entity this will instantiate

All Implemented Interfaces:

org.apache.commons.collections.Transformer

Direct Known Subclasses:

SizeTypeInitMapperTransformer

public class SubTypeInitMapperTransformer<ENTITY>
extends Object
implements org.apache.commons.collections.Transformer

AbstractEntityTransformers like QueryResultArrayToEntityTransformer; can use polymorphic instances like Size for AbstractEntityTransformer.setNestedObjectInitMap(java.util.Map).
While initializing an instance the sub-type needs to be known dynamically based on the key or field name and its value.
Accepts an Object array. {fieldName, value}
This Transformer will convert the passed params to the appropriate type based on the value. If it cannot resolve it must return null so the init mapper can give another field value a chance to instantiate the parent object.

Author:

Arjun Dhar

Constructor Summary

Constructors

Constructor and Description
SubTypeInitMapperTransformer()

Method Summary

Modifier and Type	Method and Description
protected ENTITY	instantiate(String filedName, Object fieldValue) Default implementation will return the fieldValue. This is because in many cases like JPA, the sub-type maybe instantiated already if it has a value.
Object	transform(Object input)

Methods inherited from class java.lang.Object

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

Constructor Detail

SubTypeInitMapperTransformer

public SubTypeInitMapperTransformer()

Method Detail

transform

public Object transform(Object input)

Specified by:

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

instantiate

protected ENTITY instantiate(String filedName,
                             Object fieldValue)

Default implementation will return the fieldValue.
This is because in many cases like JPA, the sub-type maybe instantiated already if it has a value.

Parameters:

filedName - as String

fieldValue - as Object (Default case expected ENTITY type)

Returns: