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Jexcel API Transformer implementation for Jxls library
package org.jxls.transform.jexcel;
import jxl.*;
import jxl.read.biff.BiffException;
import jxl.write.*;
import jxl.write.biff.RowsExceededException;
import org.jxls.common.*;
import org.jxls.transform.AbstractTransformer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
/**
* @author Leonid Vysochyn
*/
public class JexcelTransformer extends AbstractTransformer {
static Logger logger = LoggerFactory.getLogger(JexcelTransformer.class);
public static final String JEXCEL_CONTEXT_KEY = "util";
public static final int MAX_COLUMN_TO_READ_COMMENT = 50;
Workbook workbook;
WritableWorkbook writableWorkbook;
public JexcelTransformer() {
}
private JexcelTransformer(Workbook workbook, WritableWorkbook writableWorkbook) {
this.workbook = workbook;
this.writableWorkbook = writableWorkbook;
}
public static JexcelTransformer createTransformer(InputStream is, OutputStream os) throws IOException, BiffException {
Workbook workbook = Workbook.getWorkbook(is);
WritableWorkbook writableWorkbook = Workbook.createWorkbook(os, workbook);
JexcelTransformer transformer = new JexcelTransformer(workbook, writableWorkbook);
transformer.readCellData();
return transformer;
}
@Override
public Context createInitialContext() {
Context context = new Context();
context.putVar(JEXCEL_CONTEXT_KEY, new JexcelUtil());
return context;
}
private void readCellData(){
int numberOfSheets = workbook.getNumberOfSheets();
for(int i = 0; i < numberOfSheets; i++){
Sheet sheet = workbook.getSheet(i);
SheetData sheetData = JexcelSheetData.createSheetData(sheet, this);
sheetMap.put(sheetData.getSheetName(), sheetData);
}
}
public WritableWorkbook getWritableWorkbook() {
return writableWorkbook;
}
public void transform(CellRef srcCellRef, CellRef targetCellRef, Context context) {
CellData cellData = this.getCellData(srcCellRef);
if(cellData != null){
if(targetCellRef == null || targetCellRef.getSheetName() == null){
logger.info("Target cellRef is null or has empty sheet name, cellRef=" + targetCellRef);
return;
}
WritableSheet destSheet = writableWorkbook.getSheet(targetCellRef.getSheetName());
if(destSheet == null){
int numberOfSheets = writableWorkbook.getNumberOfSheets();
destSheet = writableWorkbook.createSheet(targetCellRef.getSheetName(), numberOfSheets);
JexcelUtil.copySheetProperties(workbook.getSheet( srcCellRef.getSheetName() ), destSheet);
}
SheetData sheetData = sheetMap.get(srcCellRef.getSheetName());
if(!isIgnoreColumnProps()){
CellView columnView = destSheet.getColumnView(targetCellRef.getCol());
columnView.setSize(sheetData.getColumnWidth(srcCellRef.getCol()));
destSheet.setColumnView(targetCellRef.getCol(), columnView);
}
if(!isIgnoreRowProps()){
try {
CellView rowView = destSheet.getRowView(targetCellRef.getRow());
rowView.setSize(sheetData.getRowData(srcCellRef.getRow()).getHeight());
destSheet.setRowView(targetCellRef.getRow(), rowView);
} catch (RowsExceededException e) {
logger.warn("Failed to set row height for " + targetCellRef.getCellName(), e);
}
}
try{
((JexcelCellData)cellData).writeToCell(destSheet, targetCellRef.getCol(), targetCellRef.getRow(), context);
copyMergedRegions(cellData, targetCellRef);
}catch(Exception e){
logger.error("Failed to write a cell with " + cellData + " and " + context, e);
}
}
}
private void copyMergedRegions(CellData sourceCellData, CellRef destCell) throws WriteException {
if(sourceCellData.getSheetName() == null ){ throw new IllegalArgumentException("Sheet name is null in copyMergedRegions");}
JexcelSheetData sheetData = (JexcelSheetData)sheetMap.get( sourceCellData.getSheetName() );
Range cellMergedRegion = null;
for (Range mergedRegion : sheetData.getMergedCells()) {
if(mergedRegion.getTopLeft().getRow() == sourceCellData.getRow() && mergedRegion.getTopLeft().getColumn() == sourceCellData.getCol()){
cellMergedRegion = mergedRegion;
break;
}
}
if( cellMergedRegion != null){
findAndRemoveExistingCellRegion(destCell);
WritableSheet destSheet = writableWorkbook.getSheet(destCell.getSheetName());
destSheet.mergeCells(destCell.getCol(), destCell.getRow(),
destCell.getCol() + cellMergedRegion.getBottomRight().getColumn() - cellMergedRegion.getTopLeft().getColumn(),
destCell.getRow() + cellMergedRegion.getBottomRight().getRow() - cellMergedRegion.getTopLeft().getRow());
}
}
private void findAndRemoveExistingCellRegion(CellRef cellRef) {
WritableSheet destSheet = writableWorkbook.getSheet(cellRef.getSheetName());
Range[] mergedRegions = destSheet.getMergedCells();
for(Range mergedRegion : mergedRegions){
if(mergedRegion.getTopLeft().getRow() <= cellRef.getRow() && mergedRegion.getBottomRight().getRow() >= cellRef.getRow() &&
mergedRegion.getTopLeft().getColumn() <= cellRef.getCol() && mergedRegion.getBottomRight().getColumn() >= cellRef.getCol() ){
destSheet.unmergeCells( mergedRegion );
}
}
}
public void setFormula(CellRef cellRef, String formulaString) {
if(cellRef == null || cellRef.getSheetName() == null ) return;
WritableSheet sheet = writableWorkbook.getSheet(cellRef.getSheetName());
if( sheet == null){
int numberOfSheets = writableWorkbook.getNumberOfSheets();
sheet = writableWorkbook.createSheet(cellRef.getSheetName(), numberOfSheets);
}
Cell cell = sheet.getCell(cellRef.getCol(), cellRef.getRow());
WritableCell writableCell = new Formula(cellRef.getCol(), cellRef.getRow(), formulaString);
if(cell != null && cell.getCellFormat() != null){
writableCell.setCellFormat(cell.getCellFormat());
}
try{
sheet.addCell(writableCell);
}catch (Exception e){
logger.error("Failed to set formula = " + formulaString + " into cell = " + cellRef.getCellName(), e);
}
}
public void clearCell(CellRef cellRef) {
if(cellRef == null || cellRef.getSheetName() == null ) return;
WritableSheet sheet = writableWorkbook.getSheet(cellRef.getSheetName());
if( sheet == null ) return;
Blank blankCell = new Blank(cellRef.getCol(), cellRef.getRow());
try {
sheet.addCell(blankCell);
} catch (WriteException e) {
logger.error("Failed to clean up cell " + cellRef.getCellName(), e);
}
}
public List getCommentedCells() {
List commentedCells = new ArrayList();
for (SheetData sheetData : sheetMap.values()) {
for (RowData rowData : sheetData) {
if( rowData == null ) continue;
for (CellData cellData : rowData) {
if(cellData != null && cellData.getCellComment() != null ){
commentedCells.add(cellData);
}
}
if( rowData.getNumberOfCells() == 0 ){
List commentedCellData = readCommentsFromSheet(((JexcelSheetData)sheetData).getSheet(), ((JexcelRowData)rowData).getRow());
commentedCells.addAll( commentedCellData );
}
}
}
return commentedCells;
}
public void addImage(AreaRef areaRef, byte[] imageBytes, ImageType imageType) {
if( imageType == null ){
throw new IllegalArgumentException("Image type is undefined");
}
if( imageType != ImageType.PNG){
throw new IllegalArgumentException("Only PNG images are currently supported");
}
WritableSheet sheet = writableWorkbook.getSheet(areaRef.getSheetName());
sheet.addImage(new WritableImage(areaRef.getFirstCellRef().getCol(),areaRef.getFirstCellRef().getRow(),
areaRef.getLastCellRef().getCol() - areaRef.getFirstCellRef().getCol(),
areaRef.getLastCellRef().getRow() - areaRef.getFirstCellRef().getRow(),imageBytes));
}
public void write() throws IOException {
if(writableWorkbook != null){
writableWorkbook.write();
try {
writableWorkbook.close();
} catch (WriteException e) {
throw new IllegalStateException("Cannot close a writable workbook", e);
}
}else{
throw new IllegalStateException("An attempt to write an output stream with an uninitialized WritableWorkbook");
}
}
private List readCommentsFromSheet(Sheet sheet, Cell[] cells) {
List commentDataCells = new ArrayList();
for (Cell cell : cells) {
CellFeatures cellFeatures = cell.getCellFeatures();
if (cellFeatures.getComment() != null) {
CellData cellData = new CellData(new CellRef(sheet.getName(), cell.getRow(), cell.getColumn()));
cellData.setCellComment(cellFeatures.getComment());
commentDataCells.add(cellData);
}
}
return commentDataCells;
}
@Override
public void deleteSheet(String sheetName) {
super.deleteSheet(sheetName);
Integer sheetIndex = findSheetIndex(sheetName);
writableWorkbook.removeSheet(sheetIndex);
}
@Override
public void setHidden(String sheetName, boolean hidden) {
Sheet sheet = writableWorkbook.getSheet(sheetName);
sheet.getSettings().setHidden(hidden);
}
private Integer findSheetIndex(String sheetName) {
Integer index = null;
final Sheet[] sheets = workbook.getSheets();
for(int i=0;i © 2015 - 2024 Weber Informatics LLC | Privacy Policy