Examples of org.apache.poi.hssf.record.formula.eval.EvaluationException

Package org.apache.poi.hssf.record.formula.eval

Examples of org.apache.poi.hssf.record.formula.eval.EvaluationException

org.apache.poi.hssf.record.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

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

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  }


  private static double evaluate(int year, int month, int day) throws EvaluationException {


    if (year < 0 || month < 0 || day < 0) {
      throw new EvaluationException(ErrorEval.VALUE_INVALID);
    }


    if (year == 1900 && month == Calendar.FEBRUARY && day == 29) {
      return 60.0;
    }

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  /**
   * @throws EvaluationException (#NUM!) if <tt>result</tt> is <tt>NaN</> or <tt>Infinity</tt>
   */
  static final void checkValue(double result) throws EvaluationException {
    if (Double.isNaN(result) || Double.isInfinite(result)) {
      throw new EvaluationException(ErrorEval.NUM_ERROR);
    }
  }

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      }
      return new NumberEval(result);
    }
    protected final double eval(ValueEval[] args, int srcCellRow, int srcCellCol) throws EvaluationException {
      if (args.length != 1) {
        throw new EvaluationException(ErrorEval.VALUE_INVALID);
      }
      double d = singleOperandEvaluate(args[0], srcCellRow, srcCellCol);
      return evaluate(d);
    }

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    } else {
      // ae is an area (not single row or column)
      if (!colArgWasPassed) {
        // always an error with 2-D area refs
        // Note - the type of error changes if the pRowArg is negative
        throw new EvaluationException(pRowIx < 0 ? ErrorEval.VALUE_INVALID : ErrorEval.REF_INVALID);
      }
      // Normal case - area ref is 2-D, and both index args were provided
      // if either arg is missing (or blank) the logic is similar to OperandResolver.getSingleValue()
      if (rowArgWasEmpty) {
        rowIx = srcRowIx - ae.getFirstRow();
      } else {
        rowIx = pRowIx-1;
      }
      if (colArgWasEmpty) {
        columnIx = srcColIx - ae.getFirstColumn();
      } else {
        columnIx = pColumnIx-1;
      }
    }


    int width = ae.getWidth();
    int height = ae.getHeight();
    // Slightly irregular logic for bounds checking errors
    if (!rowArgWasEmpty && rowIx >= height || !colArgWasEmpty && columnIx >= width) {
      // high bounds check fail gives #REF! if arg was explicitly passed
      throw new EvaluationException(ErrorEval.REF_INVALID);
    }
    if (rowIx < 0 || columnIx < 0 || rowIx >= height || columnIx >= width) {
      throw new EvaluationException(ErrorEval.VALUE_INVALID);
    }
    return ae.getRelativeValue(rowIx, columnIx);
  }

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    if (ev == BlankEval.instance) {
      return 0;
    }
    int result = OperandResolver.coerceValueToInt(ev);
    if (result < 0) {
      throw new EvaluationException(ErrorEval.VALUE_INVALID);
    }
    return result;
  }

View Full Code Here

        atleastOneNonBlank = true;
      }
    }


    if (!atleastOneNonBlank) {
      throw new EvaluationException(ErrorEval.VALUE_INVALID);
    }
    return result;
  }

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      LinearOffsetRange orRow, LinearOffsetRange orCol) throws EvaluationException {
    LinearOffsetRange absRows = orRow.normaliseAndTranslate(baseRef.getFirstRowIndex());
    LinearOffsetRange absCols = orCol.normaliseAndTranslate(baseRef.getFirstColumnIndex());


    if(absRows.isOutOfBounds(0, LAST_VALID_ROW_INDEX)) {
      throw new EvaluationException(ErrorEval.REF_INVALID);
    }
    if(absCols.isOutOfBounds(0, LAST_VALID_COLUMN_INDEX)) {
      throw new EvaluationException(ErrorEval.REF_INVALID);
    }
    return baseRef.offset(orRow.getFirstIndex(), orRow.getLastIndex(), orCol.getFirstIndex(), orCol.getLastIndex());
  }

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    }
    if(eval instanceof AreaEval) {
      return new BaseRef((AreaEval)eval);
    }
    if (eval instanceof ErrorEval) {
      throw new EvaluationException((ErrorEval) eval);
    }
    throw new EvaluationException(ErrorEval.VALUE_INVALID);
  }

View Full Code Here

    }
    if (ve instanceof StringEval) {
      StringEval se = (StringEval) ve;
      Double d = OperandResolver.parseDouble(se.getStringValue());
      if(d == null) {
        throw new EvaluationException(ErrorEval.VALUE_INVALID);
      }
      return d.doubleValue();
    }
    if (ve instanceof BoolEval) {
      // in the context of OFFSET, booleans resolve to 0 and 1.

View Full Code Here

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