Interface to be implemented by any instance holding a filter than can be updated dynamically.
A IFilterObserver instance receives notifications when the associated
Interface defining the requirements on text parsing for filter expressions.
Composed set of filters, added via logical AND.
Abstract parent class to support the composition of multiple filters.
Commodity class implementing the interface
Helper class used on
Composed set of filters, added via logical AND, and then NOT-ed the result.
Composed set of filters, added via logical OR.