Examples of org.apache.poi.ss.formula.eval.EvaluationException

org.apache.poi.ss.formula.eval.EvaluationException
Eval arg0 = args[0]; if(arg0 instanceof ErrorEval) { return arg0; } if(!(arg0 instanceof AreaEval)) { return ErrorEval.VALUE_INVALID; } double temp = 0; AreaEval area = (AreaEval)arg0; ValueEval[] values = area.getValues(); for (int i = 0; i < values.length; i++) { ValueEval ve = values[i]; if(ve instanceof ErrorEval) { return ve; } if(!(ve instanceof NumericValueEval)) { return ErrorEval.VALUE_INVALID; } temp += ((NumericValueEval)ve).getNumberValue(); } // ... } In this example, if any error is encountered while processing the arguments, an error is returned immediately. This code is difficult to refactor due to all the points where errors are returned.
Using EvaluationException allows the error returning code to be consolidated to one place.
```
 public Eval evaluate(Eval[] args, int srcRow, short srcCol) { try { // ... AreaEval area = getAreaArg(args[0]); double temp = sumValues(area.getValues()); // ... } catch (EvaluationException e) { return e.getErrorEval(); } } private static AreaEval getAreaArg(Eval arg0) throws EvaluationException { if (arg0 instanceof ErrorEval) { throw new EvaluationException((ErrorEval) arg0); } if (arg0 instanceof AreaEval) { return (AreaEval) arg0; } throw EvaluationException.invalidValue(); } private double sumValues(ValueEval[] values) throws EvaluationException { double temp = 0; for (int i = 0; i < values.length; i++) { ValueEval ve = values[i]; if (ve instanceof ErrorEval) { throw new EvaluationException((ErrorEval) ve); } if (!(ve instanceof NumericValueEval)) { throw EvaluationException.invalidValue(); } temp += ((NumericValueEval) ve).getNumberValue(); } return temp; } 
```
It is not mandatory to use EvaluationException, doing so might give the following advantages:
- Methods can more easily be extracted, allowing for re-use.
- Type management (typecasting etc) is simpler because error conditions have been separated from intermediate calculation values.
- Fewer local variables are required. Local variables can have stronger types.
- It is easier to mimic common Excel error handling behaviour (exit upon encountering first error), because exceptions conveniently propagate up the call stack regardless of execution points or the number of levels of nested calls.
Note - Only standard evaluation errors are represented by EvaluationException ( i.e. conditions expected to be encountered when evaluating arbitrary Excel formulas). Conditions that could never occur in an Excel spreadsheet should result in runtime exceptions. Care should be taken to not translate any POI internal error into an Excel evaluation error code. @author Josh Micich


  public static double calculate(double pStartDateVal, double pEndDateVal, int basis) throws EvaluationException {


    if (basis < 0 || basis >= 5) {
      // if basis is invalid the result is #NUM!
      throw new EvaluationException(ErrorEval.NUM_ERROR);
    }


    // common logic for all bases


    // truncate day values

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        }
        if (arg instanceof RefEval) {
            RefEval refEval = (RefEval)arg;
            if (refEval.getNumberOfSheets() > 1) {
                // Multi-Sheet references are not supported
                throw new EvaluationException(ErrorEval.VALUE_INVALID);
            }
            
            ValueEval innerValueEval = refEval.getInnerValueEval(refEval.getFirstSheetIndex());
            if(innerValueEval instanceof NumberEval) {
                return ((NumberEval) innerValueEval).getNumberValue();
            }
            if(innerValueEval instanceof BlankEval) {
                return 0;
            }
        }
        throw new EvaluationException(ErrorEval.VALUE_INVALID);
    }

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  @Override
  public double eval(ValueEval[] args, int srcCellRow, int srcCellCol) throws EvaluationException {
       
    if(args.length != 4)
            throw new EvaluationException(ErrorEval.VALUE_INVALID);


    double result;


    ValueEval v1 = OperandResolver.getSingleValue(args[0], srcCellRow, srcCellCol); 
    ValueEval v2 = OperandResolver.getSingleValue(args[1], srcCellRow, srcCellCol);

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      return new SingleValueVector(re.getInnerValueEval());
    }
    if (eval instanceof TwoDEval) {
      ValueVector result = LookupUtils.createVector((TwoDEval)eval);
      if (result == null) {
        throw new EvaluationException(ErrorEval.NA);
      }
      return result;
    }


    // Error handling for lookup_range arg is also unusual
    if(eval instanceof NumericValueEval) {
      throw new EvaluationException(ErrorEval.NA);
    }
    if (eval instanceof StringEval) {
      StringEval se = (StringEval) eval;
      Double d = OperandResolver.parseDouble(se.getStringValue());
      if(d == null) {
        // plain string
        throw new EvaluationException(ErrorEval.VALUE_INVALID);
      }
      // else looks like a number
      throw new EvaluationException(ErrorEval.NA);
    }
    throw new RuntimeException("Unexpected eval type (" + eval.getClass().getName() + ")");
  }

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  private static double evaluateMatchTypeArg(ValueEval arg, int srcCellRow, int srcCellCol)
      throws EvaluationException {
    ValueEval match_type = OperandResolver.getSingleValue(arg, srcCellRow, srcCellCol);


    if(match_type instanceof ErrorEval) {
      throw new EvaluationException((ErrorEval)match_type);
    }
    if(match_type instanceof NumericValueEval) {
      NumericValueEval ne = (NumericValueEval) match_type;
      return ne.getNumberValue();
    }
    if (match_type instanceof StringEval) {
      StringEval se = (StringEval) match_type;
      Double d = OperandResolver.parseDouble(se.getStringValue());
      if(d == null) {
        // plain string
        throw new EvaluationException(ErrorEval.VALUE_INVALID);
      }
      // if the string parses as a number, it is OK
      return d.doubleValue();
    }
    throw new RuntimeException("Unexpected match_type type (" + match_type.getClass().getName() + ")");

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      for (int i = 0; i < size; i++) {
        if(lookupComparer.compareTo(lookupRange.getItem(i)).isEqual()) {
          return i;
        }
      }
      throw new EvaluationException(ErrorEval.NA);
    }


    if(findLargestLessThanOrEqual) {
      // Note - backward iteration
      for (int i = size - 1; i>=0;  i--) {
        CompareResult cmp = lookupComparer.compareTo(lookupRange.getItem(i));
        if(cmp.isTypeMismatch()) {
          continue;
        }
        if(!cmp.isLessThan()) {
          return i;
        }
      }
      throw new EvaluationException(ErrorEval.NA);
    }


    // else - find smallest greater than or equal to
    // TODO - is binary search used for (match_type==+1) ?
    for (int i = 0; i<size; i++) {
      CompareResult cmp = lookupComparer.compareTo(lookupRange.getItem(i));
      if(cmp.isEqual()) {
        return i;
      }
      if(cmp.isGreaterThan()) {
        if(i<1) {
          throw new EvaluationException(ErrorEval.NA);
        }
        return i-1;
      }
    }


    throw new EvaluationException(ErrorEval.NA);
  }

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        }
        double beta1 = xybar / xxbar;
        double beta0 = ybar - beta1 * xbar;
    
    if (firstXerr != null) {
      throw new EvaluationException(firstXerr);
    }
    if (firstYerr != null) {
      throw new EvaluationException(firstYerr);
    }
    if (!accumlatedSome) {
      throw new EvaluationException(ErrorEval.DIV_ZERO);
    }
    
    if(function == FUNCTION.INTERCEPT) {
      return beta0;
    } else {

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    }
  }


  private static ValueVector createValueVector(ValueEval arg) throws EvaluationException {
    if (arg instanceof ErrorEval) {
      throw new EvaluationException((ErrorEval) arg);
    }
    if (arg instanceof TwoDEval) {
      return new AreaValueArray((TwoDEval) arg);
    }
    if (arg instanceof RefEval) {

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      result = performBinarySearch(vector, lookupComparer);
    } else {
      result = lookupIndexOfExactValue(lookupComparer, vector);
    }
    if(result < 0) {
      throw new EvaluationException(ErrorEval.NA);
    }
    return result;
  }

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        return;
      }
      String s = ((StringValueEval) ve).getStringValue();
      Double d = OperandResolver.parseDouble(s);
      if(d == null) {
        throw new EvaluationException(ErrorEval.VALUE_INVALID);
      }
      temp.add(d.doubleValue());
      return;
    }
    if (ve instanceof ErrorEval) {
      throw new EvaluationException((ErrorEval) ve);
    }
    if (ve == BlankEval.instance) {
      if (_isBlankCounted) {
        temp.add(0.0);
      }

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