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/* -*- C++ -*- */
// ========================================================================
// $Id$
//
// = LIBRARY
// orbsvcs
//
// = FILENAME
// Preference_Interpreter.h
//
// = AUTHOR
// Seth Widoff <sbw1@cs.wustl.edu>
//
// ========================================================================
#ifndef TAO_PREFERENCE_INTERPRETER_H
#define TAO_PREFERENCE_INTERPRETER_H
#include <map>
#include "Interpreter.h"
#include "Constraint_Evaluator.h"
#include "Constraint_Validator.h"
class TAO_Preference_Interpreter : public TAO_Interpreter
// = TITLE
// The TAO_Preference_Interpreter will, given a valid preference
// string and offers, will order the offers based on the offers'
// compliance with the preferences.
//
// = DESCRIPTION
// Each time the order_offer method is invoked, the
// TAO_Preference_Interpreter stores the offer reference in the
// order dictated by its evaluation of the preference string. After
// the TAO_Preference_Interpreter client has finished ordering all
// the offers, it will extract the offers in order using the
// remove_offer method.
{
public:
TAO_Preference_Interpreter(CosTradingRepos::ServiceTypeRepository::TypeStruct* ts,
const char* preference,
CORBA::Environment& env)
TAO_THROW_SPEC ((CosTrading::Lookup::IllegalPreference));
TAO_Preference_Interpreter(TAO_Constraint_Validator& validator,
const char* preference,
CORBA::Environment& env)
TAO_THROW_SPEC ((CosTrading::Lookup::IllegalPreference));
// Parse the preference string, determining first if it's
// valid. Throw an IllegalPreference exception if the preference
// doesn't conform to the BNF grammar for preferences.
~TAO_Preference_Interpreter(void);
// Destructor
void order_offer (CosTrading::OfferId offer_id,
CosTrading::Offer* offer);
void order_offer (CosTrading::OfferId offer_id,
CosTrading::Offer* offer,
TAO_Constraint_Evaluator& evaluator);
// Evaluate the offer, and order it internally based on the results
// of the evaluation.
int remove_offer (CosTrading::OfferId& offer_id,
CosTrading::Offer*& offer);
// Remove the next offer. The offer returned will be the next in the
// ordering determined by the preference string.
int num_offers(void);
// Return the number of offers remaining in the ordering.
private:
typedef multimap
< TAO_Literal_Constraint,
pair < CosTrading::OfferId, CosTrading::Offer* >,
less < TAO_Literal_Constraint > >
ORDERED_OFFERS;
// The map of ordered offers to their order value.
ORDERED_OFFERS offers_;
};
#endif /* TAO_PREFERENCE_INTERPRETER_H */
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