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Denormalization doesn t prevent you from executing polymorphic queries. As you ll see later in this book, you can search for all Items whose title contains valley. Both the DVD In the Valley of Elah and Napa valley wines will show up even if Item hasn t been marked with @Indexed.
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Hibernate Search doesn t read metadata annotations from interfaces, but you can, of course, map the implementation class and its properties.
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Mapping the primary key
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The data linking an object instance, a database row, and a Lucene Document, besides the entity type, is the identity property (named primary key in the database). Hibernate Search requires you to mark the identity property in a given class hierarchy. This property will be stored in the index structure and is one of the properties you ll be able to query by in a full-text query. Have a look at listing 3.5.
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Listing 3.5
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Mark the identifier property as the Lucene Document id
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@Entity @Indexed public class Dvd { @Id @GeneratedValue @DocumentId private Integer id; ... }
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Mark the id property with @DocumentId
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Marking a property as the identifier property is as simple as annotating it with @DocumentId. You can use this property in your full-text queries, but be aware that this property is untokenized and stored in the index. Why is that Hibernate Search needs to find a Lucene Document by its exact entity identifier in order to be able to update its content when the entity instance changes. It also needs to read the identifier value out of the index to retrieve the object from the persistence context. If you need to query the tokenized property, consider using the technique described in section 3.3.4.
NOTE
PRIMARY KEY AND CLASS HIERARCHY Just like a Hibernate Core entity hierarchy, an indexed class hierarchy can contain only one primary key declaration. If you try to use @DocumentId more than once in a class hierarchy, an exception will be thrown.
Some legacy database models require composite primary keys. At the time when this book was written, Hibernate Search didn t support composite identifiers out of the box. But thanks to the flexible field bridge model, you can work around this limitation. While implementing the actual field bridge is explained in section 4.1.4, we ll take a look at the mapping structure now.
Listing 3.6 Using a composite identifier through a custom FieldBridge
@Entity @Indexed public class Person {
@EmbeddedId document id @DocumentId @FieldBridge(impl = PersonPKBridge.class) Convert to something private PersonPK id;
The property is a composite identifier
Mark the property as a
chewable by Lucene
... } @Embeddable public class PersonPK implements Serializable { private String firstName; private String lastName; ... }
Mapping entities
The noticeable element is the @FieldBridge annotation. The PersonPKBridge class referenced by @FieldBridge does the conversion between the composite property and its Lucene index representation (back and forth). This class must implement either TwoWayFieldBridge or TwoWayStringBridge. We ll show a possible implementation in section 4.1.4. Marking a nonidentifier property as a document id is not supported by Hibernate Search (and probably has little use). We re starting to map the object structure into an index structure, but what is the index structure, and how does Hibernate Search physically store the entity into the Lucene index
Understanding the index structure
Indexing is a complex process, and it sometimes doesn t do what you d expect it to do. This section will show you the Lucene index structure that Hibernate Search uses. This will help you to dig faster into the index and diagnose what s going wrong. The must-have tool in the Lucene world for diving into the index internals is Luke. If you haven t read the introduction to Luke from section 2.6, we strongly encourage you to do so now. Let s take the mapping we used in section 3.2.2. We ve mapped two entities, Dvd and Drink, both inheriting from the Item superclass. Luke must read the Lucene directory from a filesystem; unfortunately, it s not possible to configure Luke to read in-memory directories. Our project will then use the default FSDirectoryProvider, as shown in listing 3.7. Don t forget to set the indexBase property.
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