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/* -*- C++ -*- */
// ============================================================================
// $Id$
//
// = LIBRARY
// orbsvcs
//
// = FILENAME
// Offer_Iterator.h
//
// = AUTHOR
// Marina Spivak <marina@cs.wustl.edu>
// Seth Widoff <sbw1@cs.wustl.edu>
//
// ============================================================================
#ifndef TAO_OFFER_ITERATOR_H
#define TAO_OFFER_ITERATOR_H
#include "Property_Filter.h"
class TAO_Export TAO_Offer_Iterator :
public POA_CosTrading::OfferIterator
// = TITLE
// This class implements CosTrading::OfferIterator IDL
// interface.
// = DESCRIPTION
// This is an abstract base class to allow for different
// implementations of OfferIterator.
// BEGIN SPEC
// The OfferIterator interface is used to return a set of service
// offers from the query operation by enabling the service offers
// to be extracted by successive operations on the OfferIterator
// interface.
// END SPEC
{
public:
// = Initialization and termination methods.
TAO_Offer_Iterator (const TAO_Property_Filter& property_filter);
virtual ~TAO_Offer_Iterator (void);
virtual void destroy (CORBA::Environment& _env)
TAO_THROW_SPEC ((CORBA::SystemException));
// BEGIN SPEC
// The destroy operation destroys the iterator. No further
// operations can be invoked on an iterator after it has been
// destroyed.
// END SPEC
virtual void add_offer (CosTrading::OfferId offer_id,
CosTrading::Offer* offer) = 0;
// Add an offer to the collection of offers the iterator will
// iterate over.
virtual CORBA::ULong max_left (CORBA::Environment &env) = 0
TAO_THROW_SPEC ((CORBA::SystemException,
CosTrading::UnknownMaxLeft));
// BEGIN SPEC
// The max_left operation returns the number of service offers
// remaining in the iterator. The exception UnknownMaxLeft is raised
// if the iterator cannot determine the remaining number of service
// offers (e.g., if the iterator determines its set of service
// offers through lazy evaluation).
// END SPEC
virtual CORBA::Boolean next_n (CORBA::ULong n,
CosTrading::OfferSeq_out offers,
CORBA::Environment &env) = 0
TAO_THROW_SPEC ((CORBA::SystemException));
// BEGIN SPEC
// The next_n operation returns a set of service offers in the
// output parameter "offers." The operation returns n service offers
// if there are at least n service offers remaining in the
// iterator. If there are fewer than n service offers in the
// iterator, then all remaining service offers are returned. The
// actual number of service offers returned can be determined from
// the length of the "offers" sequence. The next_n operation returns
// TRUE if there are further service offers to be extracted from the
// iterator. It returns FALSE if there are no further service offers
// to be extracted.
// END SPEC
protected:
TAO_Property_Filter pfilter_;
};
#endif /* TAO_OFFER_ITERATOR */
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