Module org.eclipse.persistence.core

Package org.eclipse.persistence.annotations

Annotation Type Convert

@Target({METHOD,FIELD})
@Retention(RUNTIME)
public @interface Convert

The Convert annotation specifies that a named converter should be used with the corresponding mapped attribute. The Convert annotation has the following reserved names:

• serialized: Will use a SerializedObjectConverter on the associated mapping. When using a SerializedObjectConverter the database representation is a binary field holding a serialized version of the object and the object-model representation is a the actual object.
• class-instance: Will use an ClassInstanceConverter on the associated mapping. When using a ClassInstanceConverter the database representation is a String representing the Class name and the object-model representation is an instance of that class built with a no-args constructor.
  
• xml: Will use an SerializedObjectConverter with the XMLSerializer on the associated mapping. When using a XMLSerializer the database representation is a character field holding a serialized version of the object and the object-model representation is a the actual object.
  
• json: Will use an SerializedObjectConverter with the JSONSerializer on the associated mapping. When using a JSONSerializer the database representation is a character field holding a serialized version of the object and the object-model representation is a the actual object.
  
• kryo: Will use an SerializedObjectConverter with the KryoSerializer on the associated mapping. When using a KryoSerializer the database representation is a binary field holding a serialized version of the object and the object-model representation is a the actual object.
  
• none - Will place no converter on the associated mapping. This can be used to override a situation where either another converter is defaulted or another converter is set.

When these reserved converters are not used, it is necessary to define a converter to use using the @Converter annotation.

Since:

Oracle TopLink 11.1.1.0.0

See Also:

• Converter
• ObjectTypeConverter
• TypeConverter
• SerializedObjectConverter
• ClassInstanceConverter

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
String	value	(Optional) The name of the converter to be used.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	CLASS_INSTANCE	Constant name for the reserved class instance converter.
static final String	JSON	Constant name for the reserved JSON converter.
static final String	KRYO	Constant name for the reserved Kryo converter.
static final String	NONE	Constant name for no converter.
static final String	SERIALIZED	Constant name for the reserved Java serialization converter.
static final String	XML	Constant name for the reserved XML converter.

Field Details

SERIALIZED

static final String SERIALIZED

Constant name for the reserved Java serialization converter. This will serialize the

See Also:

• Constant Field Values

CLASS_INSTANCE

static final String CLASS_INSTANCE

Constant name for the reserved class instance converter. This will store the object's class name, and create a new instance of the class on read.

See Also:

• Constant Field Values

XML

static final String XML

Constant name for the reserved XML converter. This will use JAXB to convert the object to and from XML.

See Also:

• Constant Field Values

JSON

static final String JSON

Constant name for the reserved JSON converter. This will use EclipseLink Moxy JAXB to convert the object to and from JSON.

See Also:

• Constant Field Values

KRYO

static final String KRYO

Constant name for the reserved Kryo converter. This will use Kryo to convert the object to and from an optimized binary format.

See Also:

• Constant Field Values

NONE

static final String NONE

Constant name for no converter.

See Also:

• Constant Field Values

Element Details

value

String value

(Optional) The name of the converter to be used.

Default:

"none"