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jXLS is a small and easy-to-use Java library for generating Excel files using XLS templates
package net.sf.jxls.parser;
import net.sf.jxls.exception.ParsePropertyException;
import net.sf.jxls.formula.Formula;
import net.sf.jxls.tag.Block;
import net.sf.jxls.tag.Tag;
import net.sf.jxls.tag.TagContext;
import net.sf.jxls.transformer.Configuration;
import net.sf.jxls.transformer.Row;
import net.sf.jxls.util.Util;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.xml.sax.SAXException;
import java.io.IOException;
import java.io.StringReader;
import java.util.Map;
/**
* Class for parsing excel cell
* @author Leonid Vysochyn
*/
public class CellParser {
protected final Log log = LogFactory.getLog(getClass());
private final Cell cell;
private Configuration configuration;
public CellParser(HSSFCell hssfCell, Row row, Configuration configuration) {
this.cell = new Cell( hssfCell, row );
if( configuration!=null ){
this.configuration = configuration;
}else{
this.configuration = new Configuration();
}
}
public CellParser(Cell cell) {
this.cell = cell;
}
public Cell getCell() {
return cell;
}
public Cell parseCell(Map beans){
if (cell.getHssfCell() != null) {
try {
if( cell.getHssfCell().getCellType() == HSSFCell.CELL_TYPE_STRING ){
cell.setHssfCellValue(cell.getHssfCell().getRichStringCellValue().getString());
parseCellValue( beans);
}
} catch (ParsePropertyException e) {
log.error("Can't get value for property=" + cell.getCollectionProperty().getProperty(), e);
throw new RuntimeException(e);
}
updateMergedRegions();
}
return cell;
}
public Formula parseCellFormula(){
if( cell.getHssfCell() != null && (cell.getHssfCell().getCellType() == HSSFCell.CELL_TYPE_STRING)) {
cell.setHssfCellValue( cell.getHssfCell().getRichStringCellValue().getString() );
if( cell.getHssfCellValue().startsWith(configuration.getStartFormulaToken()) && cell.getHssfCellValue().lastIndexOf(configuration.getEndFormulaToken()) > 0 ){
parseFormula();
}
}
return cell.getFormula();
}
private void parseFormula() {
// process formula cell
int i = cell.getHssfCellValue().lastIndexOf(configuration.getEndFormulaToken());
String expr = cell.getHssfCellValue().substring(2, i);
cell.setFormula(new Formula(expr));
cell.getFormula().setRowNum(new Integer(cell.getRow().getHssfRow().getRowNum()));
cell.getFormula().setCellNum(new Integer(cell.getHssfCell().getColumnIndex()));
if (i + 1 < cell.getHssfCellValue().length()) {
String tail = cell.getHssfCellValue().substring(i+1);
int j = tail.indexOf(configuration.getMetaInfoToken());
if( j >= 0 ){
cell.setMetaInfo(tail.substring(j));
if( j > 0 ){
cell.setLabel(tail.substring(0, j));
}
cell.setCollectionName(tail.substring(j + 2));
}else{
cell.setLabel(tail);
}
}
cell.setStringCellValue(cell.getHssfCellValue().substring(0, i+1));
}
private void parseCellExpression(Map beans) {
cell.setCollectionProperty(null);
String curValue = cell.getHssfCellValue();
int depRowNum = 0;
int j = curValue.lastIndexOf(configuration.getMetaInfoToken());
if( j>=0 ){
cell.setStringCellValue(cell.getHssfCellValue().substring(0, j));
cell.setMetaInfo(cell.getHssfCellValue().substring(j + 2));
String tail = curValue.substring(j + 2);
// processing additional parameters
// check if there is collection property name specified
int k = tail.indexOf(":");
if( k >= 0 ){
try {
depRowNum = Integer.parseInt( tail.substring(k+1) );
} catch (NumberFormatException e) {
// ignore it if not an integer
}
cell.setCollectionName(tail.substring(0, k));
}else{
cell.setCollectionName(tail);
}
curValue = curValue.substring(0, j);
}else{
cell.setStringCellValue(cell.getHssfCellValue());
}
try {
while( curValue.length()>0 ){
int i = curValue.indexOf(configuration.getStartExpressionToken());
if( i>=0 ) {
int k = curValue.indexOf(configuration.getEndExpressionToken(), i+2);
if( k>=0 ){
// new bean property found
String expr = curValue.substring(i+2, k);
if( i>0 ){
String before = curValue.substring(0, i);
cell.getExpressions().add( new Expression( before, configuration ) );
}
Expression expression = new Expression(expr, beans, configuration);
if( expression.getCollectionProperty() != null ){
if( cell.getCollectionProperty() == null ){
cell.setCollectionName(expression.getCollectionProperty().getFullCollectionName());
cell.setCollectionProperty(expression.getCollectionProperty());
cell.setDependentRowNumber(depRowNum);
}else{
if( log.isInfoEnabled() ){
log.info("Only the same collection property in a cell is allowed.");
}
}
}
cell.getExpressions().add( expression );
curValue = curValue.substring(k+1, curValue.length());
}else{
cell.getExpressions().add( new Expression(curValue, configuration) );
curValue = "";
}
}else{
if( curValue.length()!=cell.getHssfCellValue().length() ){
cell.getExpressions().add( new Expression( curValue, configuration ));
}
curValue = "";
}
}
} catch (Exception e) {
e.printStackTrace();
log.error("Can't parse expression", e);
}
}
private void parseCellValue(Map beans) throws ParsePropertyException {
if( cell.getHssfCellValue() !=null ){
if( cell.getHssfCellValue().startsWith(configuration.getStartFormulaToken()) && cell.getHssfCellValue().lastIndexOf(configuration.getEndFormulaToken()) > 0 ){
parseFormula();
}else if(cell.getHssfCellValue().startsWith( "<" + configuration.getTagPrefix() )){
// String tagName = cell.getHssfCellValue().split("(?<=<" + configuration.getTagPrefix() + ")\\w+", 2)[0];
String tagName = getTagName( cell.getHssfCellValue() );
if( tagName!=null ){
if (cell.getHssfCellValue().endsWith("/>")) {
Block tagBody = new Block(cell.getRow().getHssfRow().getRowNum(), cell.getHssfCell().getColumnIndex(),
cell.getRow().getHssfRow().getRowNum(), cell.getHssfCell().getColumnIndex());
parseTag( tagName, tagBody, beans, false);
} else {
HSSFCell hssfCell = findMatchingPairInRow( cell.getRow().getHssfRow(), tagName );
if( hssfCell!=null ){
// closing tag is in the same row
Block tagBody = new Block(cell.getRow().getHssfRow().getRowNum(), cell.getHssfCell().getColumnIndex(),
cell.getRow().getHssfRow().getRowNum(), hssfCell.getColumnIndex());
parseTag( tagName, tagBody, beans, true);
}else{
HSSFRow hssfRow = findMatchingPair( tagName );
if( hssfRow!=null ){
// closing tag is in hssfRow
int lastTagBodyRowNum = hssfRow.getRowNum() ;
Block tagBody = new Block(null, cell.getRow().getHssfRow().getRowNum(), lastTagBodyRowNum);
parseTag( tagName, tagBody, beans , true);
}else{
log.error("Can't find matching tag pair for " + cell.getHssfCellValue());
}
}
}
}
}else{
parseCellExpression(beans);
}
}
}
private HSSFCell findMatchingPairInRow(HSSFRow hssfRow, String tagName) {
int count = 0;
if( hssfRow!=null ){
for(int j = (cell.getHssfCell().getColumnIndex() + 1); j <= hssfRow.getLastCellNum(); j++){
HSSFCell hssfCell = hssfRow.getCell( j );
if( hssfCell != null && hssfCell.getCellType() == HSSFCell.CELL_TYPE_STRING ){
String cellValue = hssfCell.getRichStringCellValue().getString();
if( cellValue.matches("<" + configuration.getTagPrefix() + tagName + "\\b.*")){
count++;
}else{
if( cellValue.matches("" )){
if( count == 0 ){
return hssfCell;
}
count--;
}
}
}
}
}
return null;
}
private String getTagName(String xmlTag){
int i = configuration.getTagPrefix().length() + 1;
int j = i;
while( j < xmlTag.length() && Character.isLetterOrDigit( xmlTag.charAt( j ) ) ){
j++;
}
if( j == xmlTag.length() ){
log.warn("can't determine tag name");
return null;
}
return xmlTag.substring(i, j);
}
private HSSFRow findMatchingPair(String tagName) {
HSSFSheet hssfSheet = cell.getRow().getSheet().getHssfSheet();
int count = 0;
for( int i = cell.getRow().getHssfRow().getRowNum() + 1; i <= hssfSheet.getLastRowNum(); i++ ){
HSSFRow hssfRow = hssfSheet.getRow( i );
if( hssfRow!=null ){
for(short j = hssfRow.getFirstCellNum(); j <= hssfRow.getLastCellNum(); j++){
HSSFCell hssfCell = hssfRow.getCell( (int)j );
if( hssfCell != null && hssfCell.getCellType() == HSSFCell.CELL_TYPE_STRING ){
String cellValue = hssfCell.getRichStringCellValue().getString();
if( cellValue.matches("<" + configuration.getTagPrefix() + tagName + "\\b.*")){
count++;
}else{
if( cellValue.matches("" )){
if( count == 0 ){
return hssfRow;
}
count--;
}
}
}
}
}
}
return null;
}
private void parseTag(String tagName, Block tagBody, Map beans, boolean appendCloseTag){
String xml = null;
try {
if (appendCloseTag) {
xml = configuration.getJXLSRoot() + cell.getHssfCellValue() + "" + configuration.getJXLSRootEnd();
} else {
xml = configuration.getJXLSRoot() + cell.getHssfCellValue() + configuration.getJXLSRootEnd();
}
if (configuration.getEncodeXMLAttributes()) {
xml = Util.escapeAttributes( xml );
}
Tag tag = (Tag) configuration.getDigester().parse(new StringReader( xml ) );
if (tag == null) {
throw new RuntimeException("Invalid tag: " + tagName);
}
cell.setTag( tag );
TagContext tagContext = new TagContext( cell.getRow().getSheet(), tagBody, beans );
tag.init( tagContext );
} catch (IOException e) {
log.warn( "Can't parse cell tag " + cell.getHssfCellValue() + ": fullXML: " + xml, e);
throw new RuntimeException("Can't parse cell tag " + cell.getHssfCellValue() + ": fullXML: " + xml, e);
} catch (SAXException e) {
log.warn( "Can't parse cell tag " + cell.getHssfCellValue() + ": fullXML: " + xml, e);
throw new RuntimeException("Can't parse cell tag " + cell.getHssfCellValue() + ": fullXML: " + xml, e);
}
}
private void updateMergedRegions() {
cell.setMergedRegion(Util.getMergedRegion( cell.getRow().getSheet().getHssfSheet(), cell.getRow().getHssfRow().getRowNum(), cell.getHssfCell().getColumnIndex() ));
}
}