log4j/src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFDataFormat.java

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

import static org.apache.poi.xssf.XSSFTestDataSamples.openSampleWorkbook;
import static org.junit.jupiter.api.Assertions.assertEquals;

import java.io.IOException;

import org.apache.poi.ss.formula.ConditionalFormattingEvaluator;
import org.apache.poi.ss.formula.WorkbookEvaluatorProvider;
import org.apache.poi.ss.usermodel.BaseTestDataFormat;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.DataFormatter;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.CellReference;
import org.apache.poi.xssf.XSSFITestDataProvider;
import org.apache.poi.xssf.XSSFTestDataSamples;
import org.junit.jupiter.api.Test;

/**
 * Tests for {@link XSSFDataFormat}
 */
public final class TestXSSFDataFormat extends BaseTestDataFormat {

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

    /**
     * [Bug 58778] Built-in number formats can be overridden with XSSFDataFormat.putFormat(int id, String fmt)
     */
	@Test
    void test58778() throws IOException {
        try (XSSFWorkbook wb1 = new XSSFWorkbook()) {
            Cell cell = wb1.createSheet("bug58778").createRow(0).createCell(0);
            cell.setCellValue(5.25);
            CellStyle style = wb1.createCellStyle();

            XSSFDataFormat dataFormat = wb1.createDataFormat();

            short poundFmtIdx = 6;
            dataFormat.putFormat(poundFmtIdx, POUND_FMT);
            style.setDataFormat(poundFmtIdx);
            cell.setCellStyle(style);
            // Cell should appear as "<poundsymbol>5"

            try (XSSFWorkbook wb2 = XSSFTestDataSamples.writeOutCloseAndReadBack(wb1)) {
                cell = wb2.getSheet("bug58778").getRow(0).getCell(0);
                assertEquals(5.25, cell.getNumericCellValue(), 0);

                style = cell.getCellStyle();
                assertEquals(POUND_FMT, style.getDataFormatString());
                assertEquals(poundFmtIdx, style.getDataFormat());

                // manually check the file to make sure the cell is rendered as "<poundsymbol>5"
                // Verified with LibreOffice 4.2.8.2 on 2015-12-28
            }
        }
    }

    @Test
    void testConditionalFormattingEvaluation() throws IOException {
        try (Workbook wb = openSampleWorkbook("61060-conditional-number-formatting.xlsx")) {

            final DataFormatter formatter = new DataFormatter();
            final FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
            final ConditionalFormattingEvaluator cfEvaluator = new ConditionalFormattingEvaluator(wb, (WorkbookEvaluatorProvider) evaluator);

            CellReference ref = new CellReference("A1");
            Cell cell = wb.getSheetAt(0).getRow(ref.getRow()).getCell(ref.getCol());
            assertEquals("0.10", formatter.formatCellValue(cell, evaluator, cfEvaluator));
            // verify cell format without the conditional rule applied
            assertEquals("0.1", formatter.formatCellValue(cell, evaluator));

            ref = new CellReference("A3");
            cell = wb.getSheetAt(0).getRow(ref.getRow()).getCell(ref.getCol());
            assertEquals("-2.00E+03", formatter.formatCellValue(cell, evaluator, cfEvaluator));
            // verify cell format without the conditional rule applied
            assertEquals("-2000", formatter.formatCellValue(cell, evaluator));

            ref = new CellReference("A4");
            cell = wb.getSheetAt(0).getRow(ref.getRow()).getCell(ref.getCol());
            assertEquals("100", formatter.formatCellValue(cell, evaluator, cfEvaluator));

            ref = new CellReference("A5");
            cell = wb.getSheetAt(0).getRow(ref.getRow()).getCell(ref.getCol());
            assertEquals("$1,000", formatter.formatCellValue(cell, evaluator, cfEvaluator));
            // verify cell format without the conditional rule applied
            assertEquals("1000", formatter.formatCellValue(cell, evaluator));
        }
    }
}