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In the previous chapter, we left a problem unsolved: composite identifiers. Hibernate Search doesn t support composite identifiers out of the box, but you can easily write your own bridge to support such a case. Let s get back to the last chapter s example. A Person entity has a composite identity property object comprising both firstName and lastName. A bridge that s intended to be used on identifier properties needs to fulfill three actions:
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Indexing and storing the property into the Lucene index Building the identifier property out of the values stored in a given Document instance (it requires a two-way bridge) Ensuring that a Document can be found and uniquely identified from the identifier property value (through a Lucene query)
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Let s see how the bridge solves each of these needs. Listing 4.8 is an example of a composite identifier bridge for a Person object. Note that a property marked as @DocumentId is stored in the Lucene index. This must be the case in order for two-way bridges to perform their work.
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Listing 4.8 Composite identifier bridge for a Person object
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@Entity @Indexed public class Person { @EmbeddedId @DocumentId Embedded id @FieldBridge(impl=PersonPkBridge.class) private PersonPK id; ... }
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Use the custom field bridge
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public class PersonPkBridge implements TwoWayFieldBridge { public Object get(String name, Document document) { PersonPK id = new PersonPK();
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B Build composite identifier from
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document
Field field = document.getField( name + ".firstName" ); id.setFirstName( field.stringValue() ); field = document.getField( name + ".lastName" ); id.setLastName( field.stringValue() ); return id; } public String objectToString(Object object) { PersonPK id = (PersonPK) object; StringBuilder sb = new StringBuilder(); sb.append( id.getFirstName() ) .append( " " ) .append( id.getLastName() ); return sb.toString(); } public void set(String name, Object value, Document document, LuceneOptions luceneOptions) { PersonPK id = (PersonPK) value; Store store = luceneOptions.getStore(); Index index = luceneOptions.getIndex(); TermVector termVector = luceneOptions.getTermVector(); Float boost = luceneOptions.getBoost(); //store each property in a unique field Field field = new Field( name + ".firstName", id.getFirstName(), store, index, termVector ); field.setBoost( boost ); document.add( field );
unique C Createfrom string identifier
D Store each subproperty
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field = new Field( name + ".lastName", id.getLastName(), store, index, termVector ); field.setBoost( boost ); document.add( field ); //store the unique string representation in the named field field = new Field( name, Store unique objectToString( id ), representation store, index, termVector ); in field name field.setBoost( boost ); document.add( field ); } }
The main goal of a two-way field bridge is to store a property into the index (the set method) and later on to be able to build the property object from the information stored in the index (the get method). The get method reads data from the document in order to build the composite identifier object B; each property is stored in a specific field. objectToString converts the composite identifier into a unique string representation C. Hibernate Search uses this string to find a specific document (through a term query). During indexing, each subproperty is stored in the index in an individual field D. These subproperties will be read later on when Hibernate Search builds the composite identifier property by calling get. It s preferable to name these fields under the name namespace. The unique string representation of the composite identifier is stored in the name field E. Hibernate Search queries this field (through a term query) to retrieve a document by its identifier value. The example in listing 4.8 was simplistic; please don t use firstname/lastname as a primary key in a real system. The authors encourage you to always use a surrogate key instead of composite keys. In the last example, we used . (dot) and the property namespace to build field names. This helps us build Lucene queries that are intuitive to someone familiar with the domain model. Table 4.1 shows how a query looks similar to navigation in an expression language. set, get, and objectToString must be thread-safe because a bridge is shared by many concurrent calls.
Table 4.1 Queries are similar to object navigation in an expression language when Lucene field names are named after the root namespace followed by a dot (.) followed by the property name. Object navigation Lucent query
item.getRatePerDubbing(). get( "french" ). equals( "moyen" ); person.getId(). getLastName(). equals( "Griffin" );
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