poi/src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFFormulaEvaluation.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xssf.usermodel;

import junit.framework.TestCase;

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.apache.poi.xssf.XSSFITestDataProvider;

public final class TestXSSFFormulaEvaluation extends BaseTestFormulaEvaluator {

    public TestXSSFFormulaEvaluation() {
        super(XSSFITestDataProvider.instance);
    }

    public void testSharedFormulas(){
        baseTestSharedFormulas("shared_formulas.xlsx");
    }

    public void testSharedFormulas_evaluateInCell(){
        XSSFWorkbook wb = (XSSFWorkbook)_testDataProvider.openSampleWorkbook("49872.xlsx");
        FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
        XSSFSheet sheet = wb.getSheetAt(0);

        double result = 3.0;

        // B3 is a master shared formula, C3 and D3 don't have the formula written in their f element.
        // Instead, the attribute si for a particular cell is used to figure what the formula expression
        // should be based on the cell's relative location to the master formula, e.g.
        // B3:        <f t="shared" ref="B3:D3" si="0">B1+B2</f>
        // C3 and D3: <f t="shared" si="0"/>

        // get B3 and evaluate it in the cell
        XSSFCell b3 = sheet.getRow(2).getCell(1);
        assertEquals(result, evaluator.evaluateInCell(b3).getNumericCellValue());

        //at this point the master formula is gone, but we are still able to evaluate dependent cells
        XSSFCell c3 = sheet.getRow(2).getCell(2);
        assertEquals(result, evaluator.evaluateInCell(c3).getNumericCellValue());

        XSSFCell d3 = sheet.getRow(2).getCell(3);
        assertEquals(result, evaluator.evaluateInCell(d3).getNumericCellValue());
    }

    /**
     * Evaluation of cell references with column indexes greater than 255. See bugzilla 50096
     */
    public void testEvaluateColumnGreaterThan255() {
        XSSFWorkbook wb = (XSSFWorkbook) _testDataProvider.openSampleWorkbook("50096.xlsx");
        XSSFFormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();

        /**
         *  The first row simply contains the numbers 1 - 300.
         *  The second row simply refers to the cell value above in the first row by a simple formula.
         */
        for (int i = 245; i < 265; i++) {
            XSSFCell cell_noformula = wb.getSheetAt(0).getRow(0).getCell(i);
            XSSFCell cell_formula = wb.getSheetAt(0).getRow(1).getCell(i);

            CellReference ref_noformula = new CellReference(cell_noformula.getRowIndex(), cell_noformula.getColumnIndex());
            CellReference ref_formula = new CellReference(cell_noformula.getRowIndex(), cell_noformula.getColumnIndex());
            String fmla = cell_formula.getCellFormula();
            // assure that the formula refers to the cell above.
            // the check below is 'deep' and involves conversion of the shared formula:
            // in the sample file a shared formula in GN1 is spanned in the range GN2:IY2,
            assertEquals(ref_noformula.formatAsString(), fmla);

            CellValue cv_noformula = evaluator.evaluate(cell_noformula);
            CellValue cv_formula = evaluator.evaluate(cell_formula);
            assertEquals("Wrong evaluation result in " + ref_formula.formatAsString(),
                    cv_noformula.getNumberValue(), cv_formula.getNumberValue());
        }

    }
}