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/* -*- C++ -*- */
// ========================================================================
// $Id$
//
// = LIBRARY
// orbsvcs
//
// = FILENAME
// Offer_Filter.h
//
// = AUTHOR
// Seth Widoff <sbw1@cs.wustl.edu>
//
// ========================================================================
#ifndef TAO_OFFER_FILTER_H
#define TAO_OFFER_FILTER_H
#include "Policies.h"
#include "Property_Evaluator.h"
#include <set>
#include <string>
class TAO_Offer_Filter
// = TITLE
// The purpose of this class is to ensure that offers that
// shouldn't be considered by the TAO_Constraint_Interpreter
// aren't.
//
// = DESCRIPTION
// There two classes of reasons why an offer for a correct
// type shouldn't be considered: 1) The default parameters of the
// Trader or policies passed to the Lookup::query method deem it
// inappropriate to consider offers with modifiable (i.e., not
// readonly) or dynamic properties. 2) We've exceeded the
// default or provided cardinality constraints. TAO_Offer_Filter
// ensures that violation of policies doesn't occur. It's the
// enforcer.
{
public:
typedef CosTradingRepos::ServiceTypeRepository SERVICE_TYPE_REPOS;
TAO_Offer_Filter (SERVICE_TYPE_REPOS::TypeStruct* type_struct,
TAO_Policies& policies,
CORBA::Environment& _env);
// Glean from the TypeStruct and Policy setting the appropriate way
// to screen unsuitable offers from consideration.
CORBA::Boolean ok_to_consider (CosTrading::Offer* offer);
// Determine whether the poicies contained in the given policy
// object allow the Lookup interface to consider the offer. That is,
// if use_modifiable_properties is false, and the offer contains
// modifiable properties as designated in the type struct, return
// false. If use_dynamic_properties is false, and the offer contains
// dynamic properties, then return false. If the lookup interface is
// safe in considering this offer, return true and subtract from the
// search card value. When the search card value falls to zero,
// ok_to_consider always returns false.
CORBA::Boolean ok_to_consider_more (void);
// It's ok to consider more offers when lookup hasn't exceeded the
// cardinality values for searching and matching offers.
void matched_offer (void);
// Signal that the Lookup method has matched an offer; decrement the
// match_card.
private:
typedef set<string, less<string> > PROP_NAMES;
PROP_NAMES mod_props_;
// The set of the name of modifiable properties.
CORBA::ULong search_card_, match_card_;
// Keep track of the cardinalities.
CORBA::Boolean dp_;
CORBA::Boolean mod_;
// Keep track of property limitations: modifiable or dynamic ones
// may be bad.
};
#endif /* TAO_OFFER_FILTER_H */
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