TAO_Constraint_Interpreter Class Reference

TAO_Constraint_Interpreter will, given a constraint string whose syntax and semantics comply with the trader specification for the constraint language, determine if a CosTrading::Offer meets the constraints. More...

#include <Constraint_Interpreter.h>

Inheritance diagram for TAO_Constraint_Interpreter:

[legend]Collaboration diagram for TAO_Constraint_Interpreter:

[legend]List of all members.

Public Member Functions
	TAO_Constraint_Interpreter (const CosTradingRepos::ServiceTypeRepository::TypeStruct &ts, const char *constraints)
	TAO_Constraint_Interpreter (TAO_Constraint_Validator &validator, const char *constraints)
	~TAO_Constraint_Interpreter (void)
	Destructor.
CORBA::Boolean	evaluate (CosTrading::Offer *offer)
CORBA::Boolean	evaluate (TAO_Constraint_Evaluator &evaluator)

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Detailed Description

TAO_Constraint_Interpreter will, given a constraint string whose syntax and semantics comply with the trader specification for the constraint language, determine if a CosTrading::Offer meets the constraints.

TAO_Constraint_Interpreter will first build an expression tree representing the constraint expression using Lex and Yacc. Then, using a TAO_Constraint_Validator, it will validate the semantic correctness of the tree. When the evaluate method is invoked with an Offer, the TAO_Constraint_Interpreter will construct an EvaluationVisitor, which will evaluate the tree and decide whether the offer meets the constraints.

Definition at line 46 of file Constraint_Interpreter.h.

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Constructor & Destructor Documentation

TAO_BEGIN_VERSIONED_NAMESPACE_DECL TAO_Constraint_Interpreter::TAO_Constraint_Interpreter	(	const CosTradingRepos::ServiceTypeRepository::TypeStruct &	ts,
		const char *	constraints
	)

Definition at line 14 of file Constraint_Interpreter.cpp.

References ACE_NEW_THROW_EX, TAO_Interpreter::is_empty_string(), and TAO_Constraint_Validator::validate().

  : 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 ());
    }
  else
    {
      if (this->build_tree (constraints) != 0)
        throw CosTrading::IllegalConstraint (constraints);

      if (type_checker.validate (this->root_) == -1)
        throw CosTrading::IllegalConstraint (constraints);
    }
}

TAO_Constraint_Interpreter::TAO_Constraint_Interpreter	(	TAO_Constraint_Validator &	validator,
		const char *	constraints
	)

This constructor builds an expression tree representing the constraint specified in <constraints>, and throws an Illegal Constraint exception if the constraint given has syntax errors or semantic errors, such as mismatched types.

Definition at line 42 of file Constraint_Interpreter.cpp.

References ACE_NEW_THROW_EX, TAO_Interpreter::is_empty_string(), and TAO_Constraint_Validator::validate().

{
  if (TAO_Interpreter::is_empty_string (constraints))
    {
      ACE_NEW_THROW_EX (this->root_,
                        TAO_Literal_Constraint ((CORBA::Boolean) 1),
                        CORBA::NO_MEMORY ());
    }
  else
    {
      if (this->build_tree (constraints) != 0)
        throw CosTrading::IllegalConstraint (constraints);

      if (validator.validate (this->root_) == -1)
        throw CosTrading::IllegalConstraint (constraints);
    }
}

TAO_Constraint_Interpreter::~TAO_Constraint_Interpreter

(

void

)

Destructor.

Definition at line 61 of file Constraint_Interpreter.cpp.

{
}

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Member Function Documentation

CORBA::Boolean TAO_Constraint_Interpreter::evaluate

(

TAO_Constraint_Evaluator &

evaluator

)

Definition at line 73 of file Constraint_Interpreter.cpp.

References TAO_Constraint_Evaluator::evaluate_constraint().

{
  return evaluator.evaluate_constraint (this->root_);
}

CORBA::Boolean TAO_Constraint_Interpreter::evaluate

(

CosTrading::Offer *

offer

)

Definition at line 66 of file Constraint_Interpreter.cpp.

References TAO_Constraint_Evaluator::evaluate_constraint().

Referenced by TAO_Lookup< TRADER_LOCK_TYPE, MAP_LOCK_TYPE >::lookup_one_type().

{
  TAO_Trader_Constraint_Evaluator evaluator (offer);
  return evaluator.evaluate_constraint (this->root_);
}

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The documentation for this class was generated from the following files:

• Constraint_Interpreter.h
• Constraint_Interpreter.cpp

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