net.sf.mmm.util.lang.base.datatype.adapter.jpa

Class AbstractSimpleDatatypeAttributeConverter<T extends SimpleDatatype<V>,V>

java.lang.Object

net.sf.mmm.util.lang.base.datatype.adapter.jpa.AbstractSimpleDatatypeAttributeConverter<T,V>

Type Parameters:

V - the generic for the basic java type representing the value.

T - the generic for the adapted SimpleDatatype.

All Implemented Interfaces:

javax.persistence.AttributeConverter<T,V>

Direct Known Subclasses:

SimpleDatatypeAttributeConverter, VersionIdentifierAttributeConverter

public abstract class AbstractSimpleDatatypeAttributeConverter<T extends SimpleDatatype<V>,V>
extends Object
implements javax.persistence.AttributeConverter<T,V>

This is the abstract base implementation of AttributeConverter to allow the usage of SimpleDatatypes in JPA Entity classes.
If you create an implementation of SimpleDatatype that you want to use in persistent entities, you need to:

1. Create a converter implementation derived from AbstractSimpleDatatypeAttributeConverter.
2. Annotate that converter implementation with @Converter(autoApply = true)
3. Ensure that the package containing your converter(s) will actually be scanned. When using spring this is configured in org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.setPackagesToScan.

For an example how to implement such a converter see e.g. VersionIdentifierAttributeConverter.
ATTENTION:
JPA 2.1 (officially) supports the conversion of all basic types except:

• Id attributes (including the attributes of embedded ids and derived identities)
• version attributes
• relationship attributes
• attributes explicitly annotated as Enumerated or Temporal or designated as such in the XML descriptor.

Since:

6.0.0

Author:

Joerg Hohwiller (hohwille at users.sourceforge.net)

Constructor Summary

Constructors

Constructor and Description
AbstractSimpleDatatypeAttributeConverter() The constructor.

Method Summary

Modifier and Type	Method and Description
V	convertToDatabaseColumn(T datatype)

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.persistence.AttributeConverter

convertToEntityAttribute

Constructor Detail

AbstractSimpleDatatypeAttributeConverter

public AbstractSimpleDatatypeAttributeConverter()

The constructor.

Method Detail

convertToDatabaseColumn

public V convertToDatabaseColumn(T datatype)

Specified by:

convertToDatabaseColumn in interface javax.persistence.AttributeConverter<T extends SimpleDatatype<V>,V>