Limit the evaluation steps

The following example shows you how to bound the work a single calculation may do. setMaxEvaluationSteps is a safety guard against pathological dependency chains in untrusted workbooks. When the limit is reached the run stops and the affected cells are reported as EvaluationAborted diagnostics.

import com.independentsoft.calc.CalcDiagnostic;
import com.independentsoft.calc.CalcDiagnosticKind;
import com.independentsoft.calc.CalcResult;
import com.independentsoft.calc.CalcSession;
import com.independentsoft.office.spreadsheet.Workbook;

public class Example {

    public static void main(String[] args)
    {
        try
        {
            Workbook book = new Workbook("c:\\test\\untrusted.xlsx");

            CalcSession session = new CalcSession();
            session.getOptions().setMaxEvaluationSteps(1000000);

            CalcResult result = session.calculate(book);

            for (CalcDiagnostic diagnostic : result.getDiagnostics())
            {
                if (diagnostic.getKind() == CalcDiagnosticKind.EvaluationAborted)
                {
                    System.out.println("Aborted at " + diagnostic.getSheetName() + "!" + diagnostic.getCellReference());
                }
            }
        }
        catch (Exception e)
        {
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
    }
}

JCalc > Tutorial > Limit the evaluation steps

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