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NAME

       CosNotifyFilter_Filter - This module implements the OMG CosNotifyFilter::Filter interface.

DESCRIPTION

       To get access to the record definitions for the structures use:
       -include_lib("cosNotification/include/*.hrl").

EXPORTS

       _get_constraint_grammar(Filter) -> Grammar

              Types:

                 Filter = #objref
                 Grammar = string()

              This  operation  returns  which  type  of  Grammar the Filter uses. Currently, only
              "EXTENDED_TCL" is supported.

       add_constraints(Filter, ConstraintExpSeq) -> Reply

              Types:

                 Filter = #objref
                 ConstraintExpSeq = [Constraint]
                 ConstraintExp = #'CosNotifyFilter_ConstraintExp'{event_types, constraint_expr}
                 event_types = #'CosNotification_EventTypeSeq'{}
                 constraint_expr = string()
                 Reply          =           ConstraintInfoSeq           |           {'EXCEPTION',
                 #'CosNotifyFilter_InvalidConstraint'{constr}}
                 constr = ConstraintExp
                 ConstraintInfoSeq = [ConstraintInfo]
                 ConstraintInfo     =    #'CosNotifyFilter_ConstraintInfo'{constraint_expression,
                 constraint_id}
                 constraint_expression = ConstraintExp
                 constraint_id = long()

              Initially, Filters do not contain  any  constraints,  hence,  all  events  will  be
              forwarded.  The  add_constraints/2  operation  allow  us  to add constraints to the
              target object.

       modify_constraints(Filter, ConstraintIDSeq, ConstraintInfoSeq) -> Reply

              Types:

                 Filter = #objref
                 ConstraintIDSeq = [ConstraintID]
                 ConstraintID = long()
                 ConstraintInfoSeq = [ConstraintInfo]
                 ConstraintInfo    =     #'CosNotifyFilter_ConstraintInfo'{constraint_expression,
                 constraint_id}
                 constraint_expression = ConstraintExp
                 constraint_id = long()
                 Reply  =  ok  |  {'EXCEPTION',  #'CosNotifyFilter_InvalidConstraint'{constr}}  |
                 {'EXCEPTION', #'CosNotifyFilter_ConstraintNotFound'{id}}
                 constr = ConstraintExp
                 id = long()
                 ConstraintExp = #'CosNotifyFilter_ConstraintExp'{event_types, constraint_expr}
                 event_types = #'CosNotification_EventTypeSeq'{}
                 constraint_expr = string()

              This operation is invoked by a client in order to modify the constraints associated
              with  the  target  object.  The  constraints  related  to the Id's in the parameter
              sequence  ConstraintIDSeq  will,  if  all  values  are  valid,  be   deleted.   The
              ConstraintInfoSeq  parameter  contains  of  Id-Expression  pairs  and  a constraint
              matching one of the unique Id's will, if all input values are correct, be  updated.
              If the parameters contain incorrect data en exception will be raised.

       get_constraints(Filter, ConstraintIDSeq) -> Reply

              Types:

                 Filter = #objref
                 ConstraintIDSeq = [ConstraintID]
                 ConstraintID = long()
                 Reply           =           ConstraintInfoSeq           |          {'EXCEPTION',
                 #'CosNotifyFilter_ConstraintNotFound'{id}}
                 ConstraintInfoSeq = [ConstraintInfo]
                 ConstraintInfo    =     #'CosNotifyFilter_ConstraintInfo'{constraint_expression,
                 constraint_id}
                 constraint_expression = ConstraintExp
                 constraint_id = id = long()

              This  operation  return  a  sequence  of  ConstraintInfo's,  related  to  the given
              ConstraintID's, associated with the target object.

       get_all_constraints(Filter) -> ConstraintInfoSeq

              Types:

                 Filter = #objref
                 ConstraintInfoSeq = [ConstraintInfo]
                 ConstraintInfo    =     #'CosNotifyFilter_ConstraintInfo'{constraint_expression,
                 constraint_id}
                 constraint_expression = ConstraintExp
                 constraint_id = long()

              All  constraints,  and  their  unique Id, associated with the target object will be
              returned by this operation.

       remove_all_constraints(Filter) -> ok

              Types:

                 Filter = #objref

              All constraints associated with the target object are  removed  by  this  operation
              and,  since  the  the  target  object  no longer contain any constraints, true will
              always be the result of any match operation.

       destroy(Filter) -> ok

              Types:

                 Filter = #objref

              This operation terminates the target object.

       match(Filter, Event) -> Reply

              Types:

                 Filter = #objref
                 Event = #any
                 Reply            =             boolean()             |             {'EXCEPTION',
                 #'CosNotifyFilter_UnsupportedFilterableData'{}}

              This  operation  accepts  an #any{} event and returns true if it satisfies at least
              one constraint. If the event contains data of the wrong type,  e.g.,  should  be  a
              string() but in fact i a short(), an exception is raised.

       match_structured(Filter, Event) -> Reply

              Types:

                 Filter = #objref
                 Event = #'CosNotification_StructuredEvent'{}
                 Reply             =             boolean()             |            {'EXCEPTION',
                 #'CosNotifyFilter_UnsupportedFilterableData'{}}

              This operation is similar to the match  operation  but  accepts  structured  events
              instead.

       attach_callback(Filter, NotifySubscribe) -> CallbackID

              Types:

                 Filter = #objref
                 NotifySubscribe = #objref
                 CallbackID = long()

              This operation connects a NotifySubscribe object, which should be informed when the
              target object's constraints are updated. A unique Id  is  returned  which  must  be
              stored if we ever want to detach the callback object in the future.

       detach_callback(Filter, CallbackID) -> Reply

              Types:

                 Filter = #objref
                 CallbackID = long()
                 Reply = ok | {'EXCEPTION', #'CosNotifyFilter_CallbackNotFound'{}}

              If  the  target  object  has an associated callback that matches the supplied Id it
              will be removed and longer informed of any updates. If no object with a matching Id
              is found an exception is raised.

       get_callbacks(Filter) -> CallbackIDSeq

              Types:

                 Filter = #objref
                 CallbackIDSeq = [CallbackID]
                 CallbackID = long()

              This  operation returns a sequence of all connected NotifySubscribe object Id's. If
              no callbacks are associated with the target object the list will be empty.