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WireHose Developers Guide
WHQualifierFetcher instances are channels that fetch enterprise objects based on an arbitrary qualifier. Instead of fetching resources based on their tags or keywords, a qualifier fetcher uses a string such as "lastName = 'Weber' AND supervisor.firstName = 'Stanley'". Subclasses of WHQualifierFetcher can provide sort orderings and qualifier bindings (enabling queries such as "lastName = %@").
Qualifier fetchers are especially good for creating enterprise portals since you can easily create a collection of channels that give users access to widely varying enterprise data such as recent sales, inventory, current shipments, expiring contracts, etc., without having to write any WireHose-specific business logic.
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