AbstractIdentifiableType.java 文件源码

@Override
public Type<?> getIdType() {
    if ( getHierarchy().getIdentifierDescriptor() instanceof IdentifierDescriptorSingleAttribute ) {
        final SingularAttribute idAttribute = ( (IdentifierDescriptorSingleAttribute) getHierarchy().getIdentifierDescriptor() )
                .getIdAttribute();
        if ( idAttribute instanceof SingularAttributeBasic ) {
            return ( (SingularAttributeBasic) idAttribute ).getOrmType();
        }
        else if ( idAttribute instanceof SingularAttributeEmbedded ) {
            return ( (SingularAttributeEmbedded) idAttribute ).getEmbeddablePersister();
        }
        else {
            throw new IllegalStateException( "Expected BASIC or EMBEDDED attribute type for identifier" );
        }
    }
    return null;
}