Hibernate Annotations Metadata

is there a way how I can get MetaData about my Hibernate Annotations?

I need information about Associations if they are nullable o开发者_Go百科r not.

Right now I can only query for ClassMetadata

http://docs.jboss.org/hibernate/core/3.5/javadocs/org/hibernate/metadata/ClassMetadata.html

Where I can run through the properties and check if it is a

EntityType

http://docs.jboss.org/hibernate/core/3.5/javadocs/org/hibernate/type/EntityType.html

or CollectionType

http://docs.jboss.org/hibernate/core/3.5/javadocs/org/hibernate/type/CollectionType.html

EntityType apparently has a isNullable function but not CollectionType

So I thought about using the Annotation information

 @GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name = "property", value = "seizureI18n"))
 @Id
 @GeneratedValue(generator = "generator")
 @Column(name = "id", unique = true, nullable = false)
 public Integer getId() {
   return this.id;
 }

Is this possible or maybe another way to achieve what I want.

Regards

JS

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I am not sure I understand your question, but if you want to see if an annotation is present you could do like this (using introspection):

Annotation[] tabAnnotation = A.class.getField( "fieldB" ).getDeclaredAnnotations( );
for( Annotation annotation : tabAnnotation )
   if( annotation instanceof Entity )
      System.out.println( ((Entity)annotation).isNullable() );

---

A collection can't be nullable, by definition. A collection of n elements means there are n entities of the specified type that have a foreign key reference to this entity. It does not imply anything in this entity's table.

So the only relations you can check for nullability are *ToOne-relations (OneToOne, ManyToOne).