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org.eclipse.persistence.mappings.converters
Class ClassInstanceConverter

java.lang.Object
org.eclipse.persistence.mappings.converters.ClassInstanceConverter

All Implemented Interfaces:

java.io.Serializable, Converter

public class ClassInstanceConverter

extends java.lang.Object

implements Converter

Purpose: Allows a class name to be converted to and from a new instance of the class. When using a ClassInstanceConverter, the database will store the Class name and the java object model will contain an instance of that class initialized with its default constructor

Since:

OracleAS TopLink 10g (10.0.3)

Author:

James Sutherland

See Also:

Serialized Form

Field Summary

protected DatabaseMapping

mapping

Constructor Summary

ClassInstanceConverter()
PUBLIC: Default constructor.

Method Summary

java.lang.Object	convertDataValueToObjectValue(java.lang.Object fieldValue, Session session) INTERNAL: Convert the class name to a class, then create an instance of the class.
java.lang.Object	convertObjectValueToDataValue(java.lang.Object attributeValue, Session session) INTERNAL: Convert to the field class.
protected DatabaseMapping	getMapping() INTERNAL: Return the mapping.
void	initialize(DatabaseMapping mapping, Session session) INTERNAL: Set the mapping.
boolean	isMutable() INTERNAL: If the converter converts the value to a non-atomic value, i.e.

Methods inherited from class java.lang.Object

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

Field Detail

mapping

protected DatabaseMapping mapping

Constructor Detail

ClassInstanceConverter

public ClassInstanceConverter()

PUBLIC: Default constructor.

Method Detail

convertDataValueToObjectValue

public java.lang.Object convertDataValueToObjectValue(java.lang.Object fieldValue,
                                                      Session session)

INTERNAL: Convert the class name to a class, then create an instance of the class.

Specified by:

convertDataValueToObjectValue in interface Converter

convertObjectValueToDataValue

public java.lang.Object convertObjectValueToDataValue(java.lang.Object attributeValue,
                                                      Session session)

INTERNAL: Convert to the field class.

Specified by:

convertObjectValueToDataValue in interface Converter

initialize

public void initialize(DatabaseMapping mapping,
                       Session session)

INTERNAL: Set the mapping.

Specified by:

initialize in interface Converter

getMapping

protected DatabaseMapping getMapping()

INTERNAL: Return the mapping.

isMutable

public boolean isMutable()

INTERNAL: If the converter converts the value to a non-atomic value, i.e. a value that can have its' parts changed without being replaced, then it must return false, serialization can be non-atomic.

Specified by:

isMutable in interface Converter

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