TAO_Interpreter Class Reference

TAO_Interpreter is the superclass for all interpreters. Its build tree method invokes the yacc parser to parse a constraint or preference string. More...

#include <Interpreter.h>

Inheritance diagram for TAO_Interpreter:

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Collaboration diagram for TAO_Interpreter:

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List of all members.

Protected Member Functions
	TAO_Interpreter (void)
	Constructor.
	~TAO_Interpreter (void)
	Destructor.
int	build_tree (const char *preferences)
Static Protected Member Functions
static int	is_empty_string (const char *str)
Protected Attributes
TAO_Constraint *	root_
Static Private Attributes
static TAO_SYNCH_MUTEX	parserMutex__
	This mutex protects the <build_tree> method from reentrance.

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Detailed Description

TAO_Interpreter is the superclass for all interpreters. Its build tree method invokes the yacc parser to parse a constraint or preference string.

Definition at line 33 of file Interpreter.h.

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Constructor & Destructor Documentation

TAO_Interpreter::TAO_Interpreter

(

void

)

[protected]

Constructor.

Definition at line 10 of file Interpreter.cpp.

  : root_ (0)
{
}

TAO_Interpreter::~TAO_Interpreter

(

void

)

[protected]

Destructor.

Definition at line 15 of file Interpreter.cpp.

{
  delete root_;
}

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Member Function Documentation

int TAO_Interpreter::build_tree

(

const char *

preferences

)

[protected]

Using the Yacc generated parser, construct an expression tree representing <constraints> from the tokens returned by it.

Definition at line 21 of file Interpreter.cpp.

{
  ACE_GUARD_RETURN (TAO_SYNCH_MUTEX,
                    guard,
                    TAO_Interpreter::parserMutex__,
                    -1);

  TAO_Lex_String_Input::reset ((char*)constraints);
  int return_value = 0;

  yyval.constraint_ = 0;
  return_value = ::yyparse ();

  if (return_value == 0 && yyval.constraint_ != 0)
    this->root_ = yyval.constraint_;
  else
    {
      while (yylex () > 0)
        continue;
      this->root_ = 0;
    }

  return return_value;
}

int TAO_Interpreter::is_empty_string

(

const char *

str

)

[static, protected]

Definition at line 47 of file Interpreter.cpp.

{
  int return_value = 0;

  if (str != 0)
    {
      int i = 0;
      while (str[i] != '\0')
        {
          if (str[i] != ' ')
            break;

          i++;
        }

      if (str[i] == '\0')
        return_value = 1;
    }

  return return_value;
}

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Member Data Documentation

TAO_SYNCH_MUTEX TAO_Interpreter::parserMutex__ [static, private]

This mutex protects the <build_tree> method from reentrance.

Definition at line 54 of file Interpreter.h.

TAO_Constraint* TAO_Interpreter::root_ [protected]

The root of the expression tree, not equal to null if build_tree successfully builds a tree from the constraints.

Definition at line 51 of file Interpreter.h.

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

• Interpreter.h
• Interpreter.cpp