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Listing 8.4 Using parameters in filters
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public class DistributorFilterFactory { private String distributor; public void setDistributor(String distributor) { distributor = distributor; } @Factory public Filter buildDistributorFilter() { Term term = new Term( "distributor.name", distributor ); Query query = new TermQuery( term ); Filter filter = new QueryWrapperFilter( query ); return filter; } Method generating
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B injected in setters C Use injected
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@Key public FilterKey getKey() { StandardFilterKey key = new StandardFilterKey(); key.addParameter( distributor ); Default return key; implementation } }
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Defining and using a filter
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Each possible parameter has a corresponding setter B. The Filter implementation uses parameters to configure itself C. If the filter is cached and uses parameters, a method returning a FilterKey must be annotated as @Key D. StandardFilterKey receives the significant parameters and ensures that the same Filter instance won t be shared between calls involving different parameter values E.
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If you set @FullTextFilterDef.cache to FilterCacheModeType.NONE , or if the filter doesn t have any parameters, you don t need to provide an @Key method.
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You now know how to implement a Filter, either a simple one or one using parameters, declare it to Hibernate Search, and benefit from the cache. But you don t know yet how to use filters or how to set the parameters. Let s explore this process.
Applying filters to a query
You can choose to enable or disable filters per query declaratively, thanks to Hibernate Search. Each filter is enabled by name. A query can enable more than one filter; the result must pass all filters to be returned by the query. In practice, filters are chained and applied one after the other; a DocSetId that takes into account all DocSetIds in the chain is used to filter the query results. Listing 8.5 enables two filters on a query.
Listing 8.5 Activation of two filters on a Hibernate Search query
public List<Item> searchItemWithinDistributor(String search, Distributor distributor) { FullTextSession ftSession = SessionHolder.getFullTextSession(); org.apache.lucene.search.Query luceneQuery = buildLuceneQuery( search ); FullTextQuery query = ftSession.createFullTextQuery( luceneQuery, Item.class ); query.enableFullTextFilter( "security" ); query.enableFullTextFilter( "WarnerDistributor" ); List results = query.list(); return results; } @Entity @Indexed Declare filters on any @Table(name="PRODUCTS") of the indexed entities @FullTextFilterDefs( { @FullTextFilterDef(name="WarnerDistributor", impl=WarnerDistributorFilterFactory.class), @FullTextFilterDef(name="distributor", impl=DistributorFilterFactory.class), @FullTextFilterDef(name="security", impl=SecurityFilter.class) } )
A filter is activated by name Several filters can be activated
CHAPTER 8 public class Item { ... }
Filters: cross-cutting restrictions
Filters can be activated or deactivated using fullTextQuery.enableFullTextFilter(String name) or fullTextQuery.disableFullTextFilter(String name). Both methods are available for the Hibernate Core and Java Persistence extensions of FullTextQuery. Remember, for each parameter that a filter needs, you must have a corresponding setter in the Filter class or the Filter factory class. When the Filter instance (or its factory) is built, parameters are injected into their respective setters and are available to the getDocIdSet() method as well as to the @Factory and @Key methods when they are present. Listing 8.6 shows how to apply category filtering on a Hibernate Search query.
Listing 8.6 Parameters are passed to the Filter instance or its factory.
public List<Item> searchItemWithinDistributor(String search, Distributor distributor) { FullTextSession ftSession = SessionHolder.getFullTextSession(); org.apache.lucene.search.Query luceneQuery = buildLuceneQuery( search ); FullTextQuery query = ftSession.createFullTextQuery( luceneQuery, Item.class ); query.enableFullTextFilter( "security" ); query.enableFullTextFilter( "distributor" ) .setParameter( "distributor", distributor.getName() ); @SuppressWarnings("unchecked") List results = query.list(); return results; } public class DistributorFilterFactory { private String distributor; public void setDistributor(String distributor) { this.distributor = distributor; }
B Pass parameters
C Parameters are injected
@Factory public Filter buildDistributorFilter() { Parameters are Term term = new Term( "distributor.name", available distributor ); Query query = new TermQuery( term ); Filter filter = new QueryWrapperFilter( query ); filter = new CachingWrapperFilter( filter ); return filter; }
@Key public FilterKey getKey() {
Examples of filter usage and their implementation
StandardFilterKey key = new StandardFilterKey(); key.addParameter( distributor ); Parameters are return key; available }
B One or several parameters can bet set for a given filter. C Parameters are injected into the Filter instance or its factory. D Parameters are available to the @Factory method. E Parameters are available when @Key is built.
Alternatively, you can apply a filter on a query without having to declare it in Hibernate Search. The FullTextQuery API can receive Filter instances in setFilter(). The filter is added and executed after the list of enabled named filters.
While it can be convenient to use this manual approach in some situations, the authors recommend using the named filter approach because it makes the code more readable and modular and allows filter caching.
You now know all the theory behind filters. This feature is relatively simple, but it is very flexible and useful in a plethora of situations. The next section is a collection of examples showing filters used in various situations. Enough theory let s practice!
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