package Calculator;

public class CalculatorState 
{
  private OpButtonObj pendingOperation = OpButtonObj.NO_OP_BUTTON_OBJ;
  private double previousOperand = 0;
  private boolean   readingNumber = false,
                    seenDot = false;


  public void reset()
  {
    this.pendingOperation = OpButtonObj.NO_OP_BUTTON_OBJ;
    this.previousOperand = 0;
    this.readingNumber = false;
    this.seenDot = false;
  }
    
  public void startReadingNumber() 
  {
    this.readingNumber = true;
    this.seenDot = false;
  }

  public void doneReadingNumber() 
  {
    readingNumber = false;
  }

  public boolean notReadingNumber() 
  {
    return ( ! this.readingNumber );
  }

  public boolean noDotYet() 
  {
    return !this.seenDot;
  }

  public void justSawDot() 
  {
    this.seenDot = true;
  }

  public void setPendingOperation( OpButtonObj currOp ) 
  {
    this.pendingOperation = currOp;
  }

  public void resetPendingOperation()
  {
    this.pendingOperation = OpButtonObj.NO_OP_BUTTON_OBJ;
  }

  public OpButtonObj getPendingOperation() 
  {
    return this.pendingOperation;
  }

  public void setPreviousOperand( double num )
  {
    this.previousOperand = num;
  }

  public double getPreviousOperand()
  {
    return this.previousOperand;
  }

}