2d barcode vb.net Mapping the unexpected: custom bridges in Java

Encoder Data Matrix in Java Mapping the unexpected: custom bridges

Mapping the unexpected: custom bridges
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Using a custom bridge
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Like any other mapping declaration in Hibernate Search, annotations are the way to use a custom bridge. The @FieldBridge annotation is placed on a property (field or getter) that needs to be processed by a custom bridge (see listing 4.1). Optional parameters can be passed to the bridge implementation.
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Listing 4.1
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@FieldBridge declares the use of a custom bridge
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@Entity @Indexed public class Item { Property marked to @Field use a bridge Declare the bridge @FieldBridge( implementation impl=PaddedRoundedPriceBridge.class, params= { @Parameter(name="pad", value="3"), @Parameter(name="round", value="5") } ) Optionally provide private double price; parameters ... }
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When @FieldBridge is present, Hibernate Search uses the explicit bridge rather than relying on the built-in bridge-type inference system. @FieldBridge has an impl parameter that points to the bridge implementation class. You can optionally pass parameters to the bridge implementation. This is quite handy for helping to keep bridge implementations more generic and allowing different configurations for different properties. We ll cover parameters in section 4.1.3. In listing 4.1, the bridge indexes a number by padding and rounding its value. The application developer can adjust padding and rounding thanks to the bridge parameters. The @FieldBridge annotation can be added on the identifier property as well (marked by @DocumentId). In this case, the custom field bridge converts the identifier value into a Lucene structure and is able later on to extract the identifier value from the Lucene structure. Identifier values require a two-way bridge. If you map the same property multiple times, as shown in section 3.3.4, you can still use a custom field bridge. As shown in listing 4.2, the @Field.bridge parameter takes a custom bridge description annotation: @FieldBridge.
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Listing 4.2
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@FieldBridge can be used in properties indexed multiple times
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@Entity @Indexed public class Item { Set @FieldBridge @Fields( { in @Field @Field( name="price", bridge=@FieldBridge(impl=PaddedRoundedPriceFieldBridge.class),
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Mapping more advanced data structures
@Field( ... ) } ) private double price; ... }
So far, we ve seen @FieldBridge defining custom bridges on a property or an @Field. But it s sometimes useful to work at the entity level rather than on a given property. Here are a few use cases:
Several properties of an entity need to be combined and the result indexed. Some entity metadata deserves to be indexed in the entity Document, but this metadata is not stored in the entity itself. Generally speaking, the Lucene Document that contains the index information of an entity needs to index additional information, and this information is out of the scope of the Entity object.
To solve this class of problems, Hibernate Search supports the notion of a class-level bridge. A class-level bridge is like any other Hibernate Search bridge we ve seen so far. The only difference is that the entity instance is passed to the bridge in lieu of a property value. To declare a class bridge, place an @ClassBridge annotation on the class, as shown in listing 4.3.
Listing 4.3 Use @ClassBridge to add class-level bridges
@Entity Mark the use of a @Indexed class bridge Recommended Class bridges have @ClassBridge( namespace properties similar name="promotion", to @Field index=Index.UN_TOKENIZED, impl=ItemPromotionBridge.class ) Class bridge public class Item { implementation ... used }
A class bridge implements the same interface a property bridge does. A class bridge declaration is very similar to an @Field declaration except that the class bridge implementation is mandatory because it cannot be inferred from the property type. In particular, a class bridge shares the following @Field properties:
name The Lucene field name. In a class bridge, this name is recommended
but might not be followed by the class bridge implementation.
store The storing strategy used. analyzer The analyzer used. index The indexing strategy used. termVector The term vector strategy used. boost The index time boost factor used.
An @ClassBridge declaration also needs to provide the impl attribute (the class bridge implementation) and optionally provide parameters to the class bridge implementation (by using the params attribute).
Mapping the unexpected: custom bridges
In listing 4.3, the class bridge adds a promotion field to the Lucene document. The promotion information could, for example, be provided by an external service implementation called by ItemPromotionBridge. More than one class-level bridge can be declared on a given entity. Use @ClassBridges for that purpose. Since you just learned how to declare property and class bridges, the next step is to see how to implement them. Depending on the complexity and the flexibility you need in your bridge, several solutions are available. The next two sections are dedicated to this subject.
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