Build a Hibernate Type that incorporates the JPA AttributeConverter. AttributeConverter works totally in memory, meaning it converts between one Java representation (the entity attribute representation) and another (the value bound into JDBC statements or extracted from results). However, the Hibernate Type system operates at the lower level of actually dealing directly with those JDBC objects. So even though we have an AttributeConverter, we still need to "fill out" the rest of the BasicType data and bridge calls to bind/extract through the converter.

Essentially the idea here is that an intermediate Java type needs to be used. Let's use an example as a means to illustrate... Consider an AttributeConverter<Integer,String>. This tells Hibernate that the domain model defines this attribute as an Integer value (the 'entityAttributeJavaType'), but that we need to treat the value as a String (the 'databaseColumnJavaType') when dealing with JDBC (aka, the database type is a VARCHAR/CHAR):

• When binding values to PreparedStatements we need to convert the Integer value from the entity into a String and pass that String to setString. The conversion is handled by calling AttributeConverter#convertToDatabaseColumn(Object)
• When extracting values from ResultSets (or CallableStatement parameters) we need to handle the value via getString, and convert that returned String to an Integer. That conversion is handled by calling AttributeConverter#convertToEntityAttribute(Object)

Returns:Type

The built AttributeConverter -> Type adapter

Annotations

@SuppressWarnings:unchecked