pascalinterpreter.operators
Class Subtract

java.lang.Object
  pascalinterpreter.Operator
      pascalinterpreter.BinaryOperator
          pascalinterpreter.operators.Arithmetic
              pascalinterpreter.operators.Subtract

public class Subtract

extends Arithmetic

Represents a singleton.

Field Summary

private static Subtract

instance Holds singleton instance

Fields inherited from class pascalinterpreter.Operator

OP_REG_VAR_NAME

Constructor Summary

private

Subtract() prevents instantiation

Method Summary

protected double	compute(double opL, double opR) Metoda oblicza wartosc wyrazenia.
static Subtract	getInstance() Returns the singleton instance.

Methods inherited from class pascalinterpreter.operators.Arithmetic

execute

Methods inherited from class pascalinterpreter.BinaryOperator

execInitialize, isPossible, makeConversion, parseDouble

Methods inherited from class pascalinterpreter.Operator

getRegistry, setRegistry, setRegistry, setRegistry, setRegistry

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

instance

private static Subtract instance

Holds singleton instance

Constructor Detail

Subtract

private Subtract()

prevents instantiation

Method Detail

getInstance

public static Subtract getInstance()

Returns the singleton instance.

Returns:

the singleton instance

compute

protected double compute(double opL,
                         double opR)

Description copied from class: Arithmetic

Metoda oblicza wartosc wyrazenia. Wszystkie operacje, z wyjatkiem dodawania wykonywane sa na zmiennych typu double.

Specified by:

compute in class Arithmetic

Parameters:

opL - - lewy operand

opR - - prawy operand

Returns:

Wartość wyrażenia, w postaci liczby double.