TestExternalFunctionFormulas.java

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package org.apache.poi.ss.formula.ptg;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.apache.poi.hssf.HSSFTestDataSamples;
import org.apache.poi.hssf.model.HSSFFormulaParser;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellValue;
import org.junit.jupiter.api.Test;

/**
 * Tests for functions from external workbooks (e.g. YEARFRAC).
 */
final class TestExternalFunctionFormulas {

    /**
     * tests {@code NameXPtg.toFormulaString(Workbook)} and logic in Workbook below that
     */
    @Test
    void testReadFormulaContainingExternalFunction() throws Exception {
        HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("externalFunctionExample.xls");

        String expectedFormula = "YEARFRAC(B1,C1)";
        HSSFSheet sht = wb.getSheetAt(0);
        String cellFormula = sht.getRow(0).getCell(0).getCellFormula();
        assertEquals(expectedFormula, cellFormula);

        wb.close();
    }

    @Test
    void testParse() throws Exception {
        HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("externalFunctionExample.xls");
        Ptg[] ptgs = HSSFFormulaParser.parse("YEARFRAC(B1,C1)", wb);
        assertEquals(4, ptgs.length);
        assertEquals(NameXPtg.class, ptgs[0].getClass());

        wb.getSheetAt(0).getRow(0).createCell(6).setCellFormula("YEARFRAC(C1,B1)");
//      if (false) {
//          // In case you fancy checking in excel
//          try {
//              File tempFile = TempFile.createTempFile("testExtFunc", ".xls");
//              FileOutputStream fout = new FileOutputStream(tempFile);
//              wb.write(fout);
//              fout.close();
//              System.out.println("check out " + tempFile.getAbsolutePath());
//          } catch (IOException e) {
//              throw new RuntimeException(e);
//          }
//      }
        wb.close();
    }

    @Test
    void testEvaluate() throws Exception {
        HSSFWorkbook wb = HSSFTestDataSamples.openSampleWorkbook("externalFunctionExample.xls");
        HSSFSheet sheet = wb.getSheetAt(0);
        HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
        confirmCellEval(sheet, 0, 0, fe, "YEARFRAC(B1,C1)", 29.0/90.0);
        confirmCellEval(sheet, 1, 0, fe, "YEARFRAC(B2,C2)", 0.0);
        confirmCellEval(sheet, 2, 0, fe, "YEARFRAC(B3,C3,D3)", 0.0);
        confirmCellEval(sheet, 3, 0, fe, "IF(ISEVEN(3),1.2,1.6)", 1.6);
        confirmCellEval(sheet, 4, 0, fe, "IF(ISODD(3),1.2,1.6)", 1.2);
        wb.close();
    }

    private static void confirmCellEval(HSSFSheet sheet, int rowIx, int colIx,
            HSSFFormulaEvaluator fe, String expectedFormula, double expectedResult) {
        HSSFCell cell = sheet.getRow(rowIx).getCell(colIx);
        assertEquals(expectedFormula, cell.getCellFormula());
        CellValue cv = fe.evaluate(cell);
        assertEquals(expectedResult, cv.getNumberValue(), 0.0);
    }
}