Red Hat Summit4.6.2.6. ClassBridge
More than one property of an entity can be combined and indexed in a specific way to the Lucene index using the
@ClassBridge annotation. @ClassBridge can be defined at class level, and supports the termVector attribute.
In the following example, the custom
FieldBridge implementation receives the entity instance as the value parameter, rather than a particular property. The particular CatFieldsClassBridge is applied to the department instance.The FieldBridge then concatenates both branch and network, and indexes the concatenation.
Example 4.17. Implementing a ClassBridge
@Indexed
@ClassBridge(name="branchnetwork",
store=Store.YES,
impl = CatFieldsClassBridge.class,
params = @Parameter( name="sepChar", value=" " ) )
public class Department {
private int id;
private String network;
private String branchHead;
private String branch;
private Integer maxEmployees
...
}
public class CatFieldsClassBridge implements FieldBridge, ParameterizedBridge {
private String sepChar;
public void setParameterValues(Map parameters) {
this.sepChar = (String) parameters.get( "sepChar" );
}
public void set( String name, Object value, Document document, LuceneOptions luceneOptions) {
Department dep = (Department) value;
String fieldValue1 = dep.getBranch();
if ( fieldValue1 == null ) {
fieldValue1 = "";
}
String fieldValue2 = dep.getNetwork();
if ( fieldValue2 == null ) {
fieldValue2 = "";
}
String fieldValue = fieldValue1 + sepChar + fieldValue2;
Field field = new Field( name, fieldValue, luceneOptions.getStore(),
luceneOptions.getIndex(), luceneOptions.getTermVector() );
field.setBoost( luceneOptions.getBoost() );
document.add( field );
}
}