Master Index Query Builder Plug-ins

The query builder defines the different types of queries that can be used in the master index application. You can implement custom queries using custom plug-ins. To create a new query builder, you must define a class that extends the base abstract com.sun.mdm.index.querybuilder.QueryBuilder and then specify that class in a query-builder element in query.xml. The exception thrown is com.sun.mdm.index.querybuilder.QueryBuilderException. The following methods must be implemented.

• init - This method receives the XML elements after the config element of query.xml so the query builder can read its custom configuration.

• getApplicableQueryIds - This method returns an array of string IDs indicating the query objects that can be generated given the available criteria. For example, in the blocking configuration, the unique ID of each block definition is the string that is returned by getApplicableQueryIds.

• buildQueryObject - This method constructs the query object based on one of the applicable query IDs provided as an input argument.

For more information about query-related Java classes, see the master index Javadocs.