com.neurosys.modules.etl

Class DeleteRelatedEntitiesJPATransformer

java.lang.Object

com.neurosys.modules.etl.DeleteRelatedEntitiesJPATransformer

All Implemented Interfaces:

org.apache.commons.collections.Transformer

Direct Known Subclasses:

DeleteRelatedEntitiesMySQLTransformer

public class DeleteRelatedEntitiesJPATransformer
extends Object
implements org.apache.commons.collections.Transformer

Related entities can grow in relation to the core entity.
(JPA) This Transformer provides a visitor via injection to the core logic, that can allow manipulating the number of entities that are effected in a delete operation.

Author:

Arjun Dhar

See Also:

transform(Object)

Field Summary

Fields

Modifier and Type	Field and Description
protected javax.persistence.EntityManager	entityManager
protected String	entityName Name of the core entity to which all the other records/entities are related
protected boolean	isNative Is the Query and related entities native. This should be ideally set by an overriding class based on the types of relatedEntities it sets.
protected String[][]	relatedEntities A 2D Array of entity (table) and the field that is related to Core entity (Product). Array[0]=entity name, Array[1]=Related Field name in the related entityy Optionally: One can add Array[2]=update clause on Delete Operations to support logical delete. Example: field_1='xyz' Used while operations like Delete where Cascade may not be enforced and Ref.Integrity is valid.

Constructor Summary

Constructors

Constructor and Description
DeleteRelatedEntitiesJPATransformer()
DeleteRelatedEntitiesJPATransformer(String[][] relatedEntities, String entityName)

Method Summary

Modifier and Type	Method and Description
protected void	deleteBasedOnHierarchy(Object input, String relatedEntityName, String relatedFieldName)
javax.persistence.EntityManager	getEntityManager()
String	getEntityName() Name of the core entity to which all the other records/entities are related
String[][]	getRelatedEntities() A 2D Array of entity (table) and the field that is related to Core entity (Product). Array[0]=entity name, Array[1]=Related Field name in the related entityy Optionally: One can add Array[2]=update clause on Delete Operations to support logical delete. Example: field_1='xyz' Used while operations like Delete where Cascade may not be enforced and Ref.Integrity is valid.
void	setEntityManager(javax.persistence.EntityManager entityManager)
void	setEntityName(String entityName) Name of the core entity to which all the other records/entities are related
void	setRelatedEntities(String[][] relatedEntities) A 2D Array of entity (table) and the field that is related to Core entity (Product). Array[0]=entity name, Array[1]=Related Field name in the related entityy Optionally: One can add Array[2]=update clause on Delete Operations to support logical delete. Example: field_1='xyz' Used while operations like Delete where Cascade may not be enforced and Ref.Integrity is valid.
Object	transform(Object input) For various types of input run the query

Methods inherited from class java.lang.Object

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

Field Detail

entityManager

protected transient javax.persistence.EntityManager entityManager

relatedEntities

protected String[][] relatedEntities

A 2D Array of entity (table) and the field that is related to Core entity (Product).
Array[0]=entity name, Array[1]=Related Field name in the related entityy
Optionally: One can add Array[2]=update clause on Delete Operations to support logical delete.
Example: field_1='xyz'

Used while operations like Delete where Cascade may not be enforced and Ref.Integrity is valid.
Can override to automate discovery using Metamodel. By default this is specified.

entityName

protected String entityName

Name of the core entity to which all the other records/entities are related

isNative

protected boolean isNative

Is the Query and related entities native.
This should be ideally set by an overriding class based on the types of relatedEntities it sets.

Constructor Detail

DeleteRelatedEntitiesJPATransformer

public DeleteRelatedEntitiesJPATransformer()

DeleteRelatedEntitiesJPATransformer

public DeleteRelatedEntitiesJPATransformer(String[][] relatedEntities,
                                           String entityName)

Method Detail

transform

@Transactional(readOnly=false)
public Object transform(Object input)

For various types of input run the query

Specified by:

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

Returns:

null

deleteBasedOnHierarchy

@Transactional(readOnly=false)
protected void deleteBasedOnHierarchy(Object input,
                                                                     String relatedEntityName,
                                                                     String relatedFieldName)

getEntityManager

public javax.persistence.EntityManager getEntityManager()

setEntityManager

public void setEntityManager(javax.persistence.EntityManager entityManager)

getRelatedEntities

public String[][] getRelatedEntities()

A 2D Array of entity (table) and the field that is related to Core entity (Product).
Array[0]=entity name, Array[1]=Related Field name in the related entityy
Optionally: One can add Array[2]=update clause on Delete Operations to support logical delete.
Example: field_1='xyz'

Used while operations like Delete where Cascade may not be enforced and Ref.Integrity is valid.
Can override to automate discovery using Metamodel. By default this is specified.

setRelatedEntities

public void setRelatedEntities(String[][] relatedEntities)

A 2D Array of entity (table) and the field that is related to Core entity (Product).
Array[0]=entity name, Array[1]=Related Field name in the related entityy
Optionally: One can add Array[2]=update clause on Delete Operations to support logical delete.
Example: field_1='xyz'

Used while operations like Delete where Cascade may not be enforced and Ref.Integrity is valid.
Can override to automate discovery using Metamodel. By default this is specified.

getEntityName

public String getEntityName()

Name of the core entity to which all the other records/entities are related

setEntityName

public void setEntityName(String entityName)

Name of the core entity to which all the other records/entities are related