Java example com.buildforge.services.common.db.QueryFilter?

I have a customer who has asked the following:

My aim is to search for a specific value in any log entries. If the
value can be found in a log entry (i.e getMessageText), I like to get
the log's Step, Build and Project details.

Is the com.buildforge.services.common.db.QueryFilter the right class to use for this kind of query or is there a better way? If anyone has any examples of using the com.buildforge.services.common.db.QueryFilter in anger then I'd be most appreciative.

many thanks

Andy