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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.metamodel.excel;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.NumberFormat;
import java.util.Date;
import java.util.Iterator;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.formula.FormulaParseException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Color;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.FontUnderline;
import org.apache.poi.ss.usermodel.FormulaError;
import org.apache.poi.ss.usermodel.FormulaEvaluator;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFColor;
import org.apache.poi.xssf.usermodel.XSSFFont;
import org.apache.metamodel.MetaModelException;
import org.apache.metamodel.MetaModelHelper;
import org.apache.metamodel.data.DataSet;
import org.apache.metamodel.data.DataSetHeader;
import org.apache.metamodel.data.DefaultRow;
import org.apache.metamodel.data.EmptyDataSet;
import org.apache.metamodel.data.Style;
import org.apache.metamodel.data.Style.SizeUnit;
import org.apache.metamodel.data.StyleBuilder;
import org.apache.metamodel.query.SelectItem;
import org.apache.metamodel.schema.Table;
import org.apache.metamodel.util.Action;
import org.apache.metamodel.util.DateUtils;
import org.apache.metamodel.util.FileHelper;
import org.apache.metamodel.util.FileResource;
import org.apache.metamodel.util.FormatHelper;
import org.apache.metamodel.util.Func;
import org.apache.metamodel.util.InMemoryResource;
import org.apache.metamodel.util.Resource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.XMLReader;
/**
* Convenience/reusable methods for Excel workbook handling.
*/
final class ExcelUtils {
private static final Logger logger = LoggerFactory.getLogger(ExcelUtils.class);
private static final NumberFormat _numberFormat = FormatHelper.getUiNumberFormat();
private ExcelUtils() {
// prevent instantiation
}
public static XMLReader createXmlReader() {
try {
SAXParserFactory saxFactory = SAXParserFactory.newInstance();
SAXParser saxParser = saxFactory.newSAXParser();
XMLReader sheetParser = saxParser.getXMLReader();
return sheetParser;
} catch (Exception e) {
throw new MetaModelException(e);
}
}
public static Workbook readWorkbook(Resource resource) {
if (!resource.isExists()) {
// resource does not exist- create a blank workbook
if (isXlsxFile(resource)) {
return new SXSSFWorkbook(1000);
} else {
return new HSSFWorkbook();
}
}
if (resource instanceof FileResource) {
final File file = ((FileResource) resource).getFile();
try {
return WorkbookFactory.create(file);
} catch (Exception e) {
logger.error("Could not open workbook", e);
throw new IllegalStateException("Could not open workbook", e);
}
}
return resource.read(new Func() {
@Override
public Workbook eval(InputStream inputStream) {
try {
return WorkbookFactory.create(inputStream);
} catch (Exception e) {
logger.error("Could not open workbook", e);
throw new IllegalStateException("Could not open workbook", e);
}
}
});
}
public static boolean isXlsxFile(Resource resource) {
if (resource == null) {
return false;
}
return resource.getName().toLowerCase().endsWith(".xlsx");
}
/**
* Initializes a workbook instance based on a {@link ExcelDataContext}.
*
* @return a workbook instance based on the ExcelDataContext.
*/
public static Workbook readWorkbook(ExcelDataContext dataContext) {
Resource resource = dataContext.getResource();
return readWorkbook(resource);
}
/**
* Writes the {@link Workbook} to a {@link Resource}. The {@link Workbook}
* will be closed as a result of this operation!
*
* @param dataContext
* @param wb
*/
public static void writeAndCloseWorkbook(ExcelDataContext dataContext, final Workbook wb) {
// first write to a temp file to avoid that workbook source is the same
// as the target (will cause read+write cyclic overflow)
final Resource realResource = dataContext.getResource();
final Resource tempResource = new InMemoryResource(realResource.getQualifiedPath());
tempResource.write(new Action() {
@Override
public void run(OutputStream outputStream) throws Exception {
wb.write(outputStream);
}
});
if (wb instanceof HSSFWorkbook && realResource instanceof FileResource && realResource.isExists()) {
// TODO POI has a problem with closing a file-reference/channel
// after wb.write() is invoked. See POI issue to be fixed:
// https://bz.apache.org/bugzilla/show_bug.cgi?id=58480
System.gc();
System.runFinalization();
try {
Thread.sleep(800);
} catch (InterruptedException e) {
}
}
FileHelper.safeClose(wb);
FileHelper.copy(tempResource, realResource);
}
public static String getCellValue(Workbook wb, Cell cell) {
if (cell == null) {
return null;
}
final String cellCoordinate = "(" + cell.getRowIndex() + "," + cell.getColumnIndex() + ")";
final String result;
switch (cell.getCellType()) {
case Cell.CELL_TYPE_BLANK:
result = null;
break;
case Cell.CELL_TYPE_BOOLEAN:
result = Boolean.toString(cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_ERROR:
String errorResult;
try {
byte errorCode = cell.getErrorCellValue();
FormulaError formulaError = FormulaError.forInt(errorCode);
errorResult = formulaError.getString();
} catch (RuntimeException e) {
logger.debug("Getting error code for {} failed!: {}", cellCoordinate, e.getMessage());
if (cell instanceof XSSFCell) {
// hack to get error string, which is available
String value = ((XSSFCell) cell).getErrorCellString();
errorResult = value;
} else {
logger.error("Couldn't handle unexpected error scenario in cell: " + cellCoordinate, e);
throw e;
}
}
result = errorResult;
break;
case Cell.CELL_TYPE_FORMULA:
// result = cell.getCellFormula();
result = getFormulaCellValue(wb, cell);
break;
case Cell.CELL_TYPE_NUMERIC:
if (HSSFDateUtil.isCellDateFormatted(cell)) {
Date date = cell.getDateCellValue();
if (date == null) {
result = null;
} else {
result = DateUtils.createDateFormat().format(date);
}
} else {
// TODO: Consider not formatting it, but simple using
// Double.toString(...)
result = _numberFormat.format(cell.getNumericCellValue());
}
break;
case Cell.CELL_TYPE_STRING:
result = cell.getRichStringCellValue().getString();
break;
default:
throw new IllegalStateException("Unknown cell type: " + cell.getCellType());
}
logger.debug("cell {} resolved to value: {}", cellCoordinate, result);
return result;
}
private static String getFormulaCellValue(Workbook wb, Cell cell) {
// first try with a cached/precalculated value
try {
double numericCellValue = cell.getNumericCellValue();
// TODO: Consider not formatting it, but simple using
// Double.toString(...)
return _numberFormat.format(numericCellValue);
} catch (Exception e) {
if (logger.isInfoEnabled()) {
logger.info("Failed to fetch cached/precalculated formula value of cell: " + cell, e);
}
}
// evaluate cell first, if possible
try {
if (logger.isInfoEnabled()) {
logger.info("cell({},{}) is a formula. Attempting to evaluate: {}", new Object[] { cell.getRowIndex(),
cell.getColumnIndex(), cell.getCellFormula() });
}
final FormulaEvaluator evaluator = wb.getCreationHelper().createFormulaEvaluator();
// calculates the formula and puts it's value back into the cell
final Cell evaluatedCell = evaluator.evaluateInCell(cell);
return getCellValue(wb, evaluatedCell);
} catch (RuntimeException e) {
logger.warn("Exception occurred while evaluating formula at position ({},{}): {}",
new Object[] { cell.getRowIndex(), cell.getColumnIndex(), e.getMessage() });
// Some exceptions we simply log - result will be then be the
// actual formula
if (e instanceof FormulaParseException) {
logger.error("Parse exception occurred while evaluating cell formula: " + cell, e);
} else if (e instanceof IllegalArgumentException) {
logger.error("Illegal formula argument occurred while evaluating cell formula: " + cell, e);
} else {
logger.error("Unexpected exception occurred while evaluating cell formula: " + cell, e);
}
}
// last resort: return the string formula
return cell.getCellFormula();
}
public static Style getCellStyle(Workbook workbook, Cell cell) {
if (cell == null) {
return Style.NO_STYLE;
}
final CellStyle cellStyle = cell.getCellStyle();
final short fontIndex = cellStyle.getFontIndex();
final Font font = workbook.getFontAt(fontIndex);
final StyleBuilder styleBuilder = new StyleBuilder();
// Font bold, italic, underline
if (font.getBoldweight() >= Font.BOLDWEIGHT_BOLD) {
styleBuilder.bold();
}
if (font.getItalic()) {
styleBuilder.italic();
}
if (font.getUnderline() != FontUnderline.NONE.getByteValue()) {
styleBuilder.underline();
}
// Font size
final Font stdFont = workbook.getFontAt((short) 0);
final short fontSize = font.getFontHeightInPoints();
if (stdFont.getFontHeightInPoints() != fontSize) {
styleBuilder.fontSize(fontSize, SizeUnit.PT);
}
// Font color
final short colorIndex = font.getColor();
if (font instanceof HSSFFont) {
if (colorIndex != HSSFFont.COLOR_NORMAL) {
final HSSFWorkbook wb = (HSSFWorkbook) workbook;
HSSFColor color = wb.getCustomPalette().getColor(colorIndex);
if (color != null) {
short[] triplet = color.getTriplet();
styleBuilder.foreground(triplet);
}
}
} else if (font instanceof XSSFFont) {
XSSFFont xssfFont = (XSSFFont) font;
XSSFColor color = xssfFont.getXSSFColor();
if (color != null) {
String argbHex = color.getARGBHex();
if (argbHex != null) {
styleBuilder.foreground(argbHex.substring(2));
}
}
} else {
throw new IllegalStateException("Unexpected font type: " + (font == null ? "null" : font.getClass()) + ")");
}
// Background color
if (cellStyle.getFillPattern() == 1) {
Color color = cellStyle.getFillForegroundColorColor();
if (color instanceof HSSFColor) {
short[] triplet = ((HSSFColor) color).getTriplet();
if (triplet != null) {
styleBuilder.background(triplet);
}
} else if (color instanceof XSSFColor) {
String argb = ((XSSFColor) color).getARGBHex();
if (argb != null) {
styleBuilder.background(argb.substring(2));
}
} else {
throw new IllegalStateException("Unexpected color type: " + (color == null ? "null" : color.getClass())
+ ")");
}
}
// alignment
switch (cellStyle.getAlignment()) {
case CellStyle.ALIGN_LEFT:
styleBuilder.leftAligned();
break;
case CellStyle.ALIGN_RIGHT:
styleBuilder.rightAligned();
break;
case CellStyle.ALIGN_CENTER:
styleBuilder.centerAligned();
break;
case CellStyle.ALIGN_JUSTIFY:
styleBuilder.justifyAligned();
break;
}
return styleBuilder.create();
}
public static Iterator getRowIterator(Sheet sheet, ExcelConfiguration configuration, boolean jumpToDataRows) {
final Iterator iterator;
if (configuration.isSkipEmptyLines()) {
iterator = sheet.rowIterator();
} else {
iterator = new ZeroBasedRowIterator(sheet);
}
if (jumpToDataRows) {
final int columnNameLineNumber = configuration.getColumnNameLineNumber();
if (columnNameLineNumber != ExcelConfiguration.NO_COLUMN_NAME_LINE) {
// iterate past the column headers
if (iterator.hasNext()) {
iterator.next();
}
for (int i = 1; i < columnNameLineNumber; i++) {
if (iterator.hasNext()) {
iterator.next();
} else {
// no more rows!
break;
}
}
}
}
return iterator;
}
/**
* Creates a MetaModel row based on an Excel row
*
* @param workbook
* @param row
* @param selectItems
* select items of the columns in the table
* @return
*/
public static DefaultRow createRow(Workbook workbook, Row row, DataSetHeader header) {
final int size = header.size();
final String[] values = new String[size];
final Style[] styles = new Style[size];
if (row != null) {
for (int i = 0; i < size; i++) {
final int columnNumber = header.getSelectItem(i).getColumn().getColumnNumber();
final Cell cell = row.getCell(columnNumber);
final String value = ExcelUtils.getCellValue(workbook, cell);
final Style style = ExcelUtils.getCellStyle(workbook, cell);
values[i] = value;
styles[i] = style;
}
}
return new DefaultRow(header, values, styles);
}
public static DataSet getDataSet(Workbook workbook, Sheet sheet, Table table, ExcelConfiguration configuration) {
final SelectItem[] selectItems = MetaModelHelper.createSelectItems(table.getColumns());
final Iterator rowIterator = getRowIterator(sheet, configuration, true);
if (!rowIterator.hasNext()) {
// no more rows!
FileHelper.safeClose(workbook);
return new EmptyDataSet(selectItems);
}
final DataSet dataSet = new XlsDataSet(selectItems, workbook, rowIterator);
return dataSet;
}
}
