CompositeNestedGeneratedValueGenerator

Class Overview

For composite identifiers, defines a number of "nested" generations that need to happen to "fill" the identifier property(s).

This generator is used implicitly for all composite identifier scenarios if an explicit generator is not in place. So it make sense to discuss the various potential scenarios:

• "embedded" composite identifier - this is possible only in HBM mappings as <composite-id/> (notice the lack of both a name and class attribute declarations). The term "embedded" here refers to the Hibernate usage which is actually the exact opposite of the JPA meaning of "embedded". Essentially this means that the entity class itself holds the named composite pk properties. This is very similar to the JPA @IdClass usage, though without a separate pk-class for loading.
• pk-class as entity attribute - this is possible in both annotations (@EmbeddedId) and HBM mappings (<composite-id name="idAttributeName" class="PkClassName"/>)
• "embedded" composite identifier with a pk-class - this is the JPA @IdClass use case and is only possible in annotations

Most of the grunt work is done in Component.

Summary

[Expand] Inherited Constants
From interface org.hibernate.id.IdentifierGenerator String ENTITY_NAME The configuration parameter holding the entity name

[Expand] Inherited Methods
From class java.lang.Object Object clone() boolean equals(Object arg0) void finalize() final Class<?> getClass() int hashCode() final void notify() final void notifyAll() String toString() final void wait() final void wait(long arg0, int arg1) final void wait(long arg0)
From interface org.hibernate.id.IdentifierGenerator abstract Serializable generate(SessionImplementor session, Object object) Generate a new identifier.
From interface org.hibernate.id.IdentifierGeneratorAggregator abstract void registerPersistentGenerators(Map generatorMap) Register any sub generators which implement PersistentIdentifierGenerator by their generatorKey.