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// $Id$
#include "Constraint_Interpreter.h"
#include "Trader_Constraint_Visitors.h"
ACE_RCSID (Trader,
Constraint_Interpreter,
"$Id$")
TAO_BEGIN_VERSIONED_NAMESPACE_DECL
TAO_Constraint_Interpreter::TAO_Constraint_Interpreter (
const CosTradingRepos::ServiceTypeRepository::TypeStruct& ts,
const char* constraints
ACE_ENV_ARG_DECL
)
ACE_THROW_SPEC ((CosTrading::IllegalConstraint,
CORBA::NO_MEMORY))
: TAO_Interpreter ()
{
// @@ Throwing Exception from constructor is very nasty situation to
// deal with.
TAO_Trader_Constraint_Validator type_checker (ts);
if (TAO_Interpreter::is_empty_string (constraints))
{
ACE_NEW_THROW_EX (this->root_,
TAO_Literal_Constraint ((CORBA::Boolean) 1),
CORBA::NO_MEMORY ());
ACE_CHECK;
}
else
{
if (this->build_tree (constraints) != 0)
ACE_THROW (CosTrading::IllegalConstraint (constraints));
if (type_checker.validate (this->root_) == -1)
ACE_THROW (CosTrading::IllegalConstraint (constraints));
}
}
TAO_Constraint_Interpreter::
TAO_Constraint_Interpreter (TAO_Constraint_Validator& validator,
const char* constraints
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CosTrading::IllegalConstraint,
CORBA::NO_MEMORY))
{
if (TAO_Interpreter::is_empty_string (constraints))
{
ACE_NEW_THROW_EX (this->root_,
TAO_Literal_Constraint ((CORBA::Boolean) 1),
CORBA::NO_MEMORY ());
ACE_CHECK;
}
else
{
if (this->build_tree (constraints) != 0)
ACE_THROW (CosTrading::IllegalConstraint (constraints));
if (validator.validate (this->root_) == -1)
ACE_THROW (CosTrading::IllegalConstraint (constraints));
}
}
TAO_Constraint_Interpreter::~TAO_Constraint_Interpreter (void)
{
}
CORBA::Boolean
TAO_Constraint_Interpreter::evaluate (CosTrading::Offer* offer)
{
TAO_Trader_Constraint_Evaluator evaluator (offer);
return evaluator.evaluate_constraint (this->root_);
}
CORBA::Boolean
TAO_Constraint_Interpreter::evaluate (TAO_Constraint_Evaluator& evaluator)
{
return evaluator.evaluate_constraint (this->root_);
}
TAO_Preference_Interpreter::TAO_Preference_Interpreter (
const CosTradingRepos::ServiceTypeRepository::TypeStruct& ts,
const char* preference
ACE_ENV_ARG_DECL
)
ACE_THROW_SPEC ((CosTrading::Lookup::IllegalPreference,
CORBA::NO_MEMORY))
: TAO_Interpreter ()
{
TAO_Trader_Constraint_Validator type_checker (ts);
if (TAO_Interpreter::is_empty_string (preference))
{
ACE_NEW_THROW_EX (this->root_,
TAO_Noop_Constraint (TAO_FIRST),
CORBA::NO_MEMORY ());
ACE_CHECK;
}
else
{
if (this->build_tree (preference) != 0)
ACE_THROW (CosTrading::Lookup::IllegalPreference (preference));
if (type_checker.validate (this->root_) == -1)
ACE_THROW (CosTrading::Lookup::IllegalPreference (preference));
}
}
TAO_Preference_Interpreter::
TAO_Preference_Interpreter (TAO_Constraint_Validator& validator,
const char* preference
ACE_ENV_ARG_DECL)
ACE_THROW_SPEC ((CosTrading::Lookup::IllegalPreference,
CORBA::NO_MEMORY))
: TAO_Interpreter ()
{
if (TAO_Interpreter::is_empty_string (preference))
{
ACE_NEW_THROW_EX (this->root_,
TAO_Noop_Constraint (TAO_FIRST),
CORBA::NO_MEMORY ());
ACE_CHECK;
}
else
{
if (this->build_tree (preference) != 0)
ACE_THROW (CosTrading::Lookup::IllegalPreference (preference));
if (validator.validate (this->root_) == -1)
ACE_THROW (CosTrading::Lookup::IllegalPreference (preference));
}
}
TAO_Preference_Interpreter::~TAO_Preference_Interpreter ()
{
}
void
TAO_Preference_Interpreter::
order_offer (CosTrading::Offer* offer,
CosTrading::OfferId offer_id)
{
TAO_Trader_Constraint_Evaluator evaluator (offer);
this->order_offer (evaluator, offer, offer_id);
}
void
TAO_Preference_Interpreter::
order_offer (TAO_Constraint_Evaluator& evaluator,
CosTrading::Offer* offer,
CosTrading::OfferId offer_id)
{
if (this->root_ != 0)
{
Preference_Info pref_info;
pref_info.offer_ = offer;
pref_info.offer_id_ = offer_id;
pref_info.evaluated_ = 1;
if (evaluator.evaluate_preference (this->root_, pref_info.value_) == 0)
{
// If the evaluation succeeds, insert the node into the
// correct place in the queue.
TAO_Expression_Type expr_type = this->root_->expr_type ();
if (expr_type == TAO_FIRST
|| (expr_type == TAO_WITH
&& ! static_cast<CORBA::Boolean> (pref_info.value_)))
this->offers_.enqueue_tail (pref_info);
else
this->offers_.enqueue_head (pref_info);
if (expr_type == TAO_MIN || expr_type == TAO_MAX)
{
Ordered_Offers::ITERATOR offer_iter (this->offers_);
// Push the new item down the list until the min/max
// criterion is satisfied. Observe the evaluation failed
// / evaluation suceeded partion in the list.
offer_iter.advance ();
for (int i = 1;
offer_iter.done () == 0;
offer_iter.advance (), i++)
{
Preference_Info* current_offer;
offer_iter.next (current_offer);
// Maintain the sorted order in the first partition.
if (current_offer->evaluated_ == 1
&& ((expr_type == TAO_MIN
&& pref_info.value_ > current_offer->value_)
|| (expr_type == TAO_MAX
&& pref_info.value_ < current_offer->value_)))
{
// Swap the out of order pair
this->offers_.set (*current_offer,
i - 1);
this->offers_.set (pref_info, i);
}
else
break;
}
}
}
else
{
// If the evaluation fails, just tack the sucker onto the
// end of the queue.
pref_info.evaluated_ = 0;
this->offers_.enqueue_tail (pref_info);
}
}
}
int
TAO_Preference_Interpreter::
remove_offer (CosTrading::Offer*& offer,
CosTrading::OfferId& offer_id)
{
int return_value = -1;
Preference_Info pref_info;
return_value = this->offers_.dequeue_head (pref_info);
if (return_value == 0)
{
offer = pref_info.offer_;
offer_id = pref_info.offer_id_;
}
return return_value;
}
int
TAO_Preference_Interpreter::
remove_offer (CosTrading::Offer*& offer)
{
CosTrading::OfferId offer_id = 0;
return this->remove_offer (offer, offer_id);
}
size_t
TAO_Preference_Interpreter::num_offers (void)
{
return this->offers_.size ();
}
TAO_END_VERSIONED_NAMESPACE_DECL
|
