Example usage for org.apache.poi.xssf.streaming SXSSFWorkbook getCreationHelper

Introduction

In this page you can find the example usage for org.apache.poi.xssf.streaming SXSSFWorkbook getCreationHelper.

Prototype

@Override
public CreationHelper getCreationHelper() 

Source Link

Document

Returns an object that handles instantiating concrete classes of the various instances one needs for HSSF, XSSF and SXSSF.

Usage

From source file:com.rapidminer.operator.io.ExcelExampleSetWriter.java

License:Open Source License

/**
 * Writes the provided {@link ExampleSet} to a XLSX formatted data sheet.
 *
 * @param wb/*from  w  w w  .j  a  v  a2  s. c  o m*/
 *            the workbook to use
 * @param sheet
 *            the excel sheet to write to.
 * @param dateFormat
 *            a string which describes the format used for dates.
 * @param numberFormat
 *            a string which describes the format used for numbers.
 * @param exampleSet
 *            the exampleSet to write
 * @param op
 *            needed for checkForStop
 * @throws ProcessStoppedException
 *             if the process was stopped by the user.
 * @throws WriteException
 */
private static void writeXLSXDataSheet(SXSSFWorkbook wb, Sheet sheet, String dateFormat, String numberFormat,
        ExampleSet exampleSet, Operator op) throws WriteException, ProcessStoppedException {

    Font headerFont = wb.createFont();
    headerFont.setBold(true);

    CellStyle headerStyle = wb.createCellStyle();
    headerStyle.setFont(headerFont);

    // create the header
    Iterator<Attribute> a = exampleSet.getAttributes().allAttributes();
    int columnCounter = 0;
    int rowCounter = 0;
    Row headerRow = sheet.createRow(rowCounter);
    while (a.hasNext()) {
        Attribute attribute = a.next();
        Cell headerCell = headerRow.createCell(columnCounter);
        headerCell.setCellValue(attribute.getName());
        headerCell.setCellStyle(headerStyle);
        columnCounter++;
    }
    rowCounter++;

    // body font
    Font bodyFont = wb.createFont();
    bodyFont.setBold(false);

    CreationHelper createHelper = wb.getCreationHelper();

    // number format
    CellStyle numericalStyle = wb.createCellStyle();
    numericalStyle.setDataFormat(createHelper.createDataFormat().getFormat(numberFormat));
    numericalStyle.setFont(bodyFont);

    // date format
    CellStyle dateStyle = wb.createCellStyle();
    dateStyle.setDataFormat(createHelper.createDataFormat().getFormat(dateFormat));
    dateStyle.setFont(bodyFont);

    // create nominal cell style
    CellStyle nominalStyle = wb.createCellStyle();
    nominalStyle.setFont(bodyFont);

    // fill body
    for (Example example : exampleSet) {

        // create new row
        Row bodyRow = sheet.createRow(rowCounter);

        // iterate over attributes and save examples
        a = exampleSet.getAttributes().allAttributes();
        columnCounter = 0;
        while (a.hasNext()) {
            Attribute attribute = a.next();
            Cell currentCell = bodyRow.createCell(columnCounter);
            if (!Double.isNaN(example.getValue(attribute))) {
                if (Ontology.ATTRIBUTE_VALUE_TYPE.isA(attribute.getValueType(), Ontology.DATE_TIME)) {
                    Date dateValue = example.getDateValue(attribute);
                    currentCell.setCellValue(dateValue);
                    currentCell.setCellStyle(dateStyle);
                } else if (Ontology.ATTRIBUTE_VALUE_TYPE.isA(attribute.getValueType(), Ontology.NUMERICAL)) {
                    double numericalValue = example.getNumericalValue(attribute);
                    currentCell.setCellValue(numericalValue);
                    currentCell.setCellStyle(numericalStyle);
                } else {
                    currentCell.setCellValue(
                            stripIfNecessary(replaceForbiddenChars(example.getValueAsString(attribute))));
                    currentCell.setCellStyle(nominalStyle);
                }
            }
            columnCounter++;
        }
        rowCounter++;

        // checkForStop every 100 examples
        if (op != null && rowCounter % 100 == 0) {
            op.checkForStop();
        }
    }
}

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From source file:de.ks.idnadrev.expimp.xls.ReflectionColumn.java

License:Apache License

@Override
public CellStyle getCellStyle(SXSSFWorkbook workbook) {
    CreationHelper creationHelper = workbook.getCreationHelper();
    if (LocalDateTime.class.isAssignableFrom(fieldType)) {
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setDataFormat(creationHelper.createDataFormat().getFormat("yyyy/mm/dd hh:mm:ss"));
        return cellStyle;
    } else if (LocalDate.class.isAssignableFrom(fieldType)) {
        CellStyle cellStyle = workbook.createCellStyle();
        cellStyle.setDataFormat(creationHelper.createDataFormat().getFormat("yyyy/mm/dd"));
        return cellStyle;
    }/*w w w .  j  a  v a  2s  .  com*/
    return null;
}

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