Module eclipselink

Package org.eclipse.persistence.descriptors

Class ClassExtractor

java.lang.Object

org.eclipse.persistence.descriptors.ClassExtractor

Direct Known Subclasses:

MethodClassExtractor

public abstract class ClassExtractor
extends Object

Purpose: Abstract class to allow complex inheritance support. Typically class indicators are used to define inheritance in the database, however in complex cases the class type may be determined through another mechanism. The class extractor must be able to determine and return the class type from the database row.

See Also:

InheritancePolicy.setClassExtractor(ClassExtractor)

Constructor Summary

Constructors

Constructor	Description
ClassExtractor()

Method Summary

Modifier and Type	Method	Description
abstract <T> Class<T>	extractClassFromRow(DataRecord databaseRow, Session session)	Extract/compute the class from the database row and return the class.
void	initialize(ClassDescriptor descriptor, Session session)	Allow for any initialization.

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassExtractor

public ClassExtractor()

Method Detail

extractClassFromRow

public abstract <T> Class<T> extractClassFromRow(DataRecord databaseRow,
                                                 Session session)

Extract/compute the class from the database row and return the class. Map is used as the public interface to database row, the key is the field name, the value is the database value.

initialize

public void initialize(ClassDescriptor descriptor,
                       Session session)
                throws DescriptorException

Allow for any initialization.

Throws:

DescriptorException