Add method getUnderlyingObject which returns the internal xssf object…

gxoffice/src/main/java/com/genexus/msoffice/excel/ExcelSpreadsheetGXWrapper.java

@@ -11,6 +11,7 @@
 import com.genexus.msoffice.excel.exception.ExcelTemplateNotFoundException;
 import com.genexus.msoffice.excel.poi.xssf.ExcelCells;
 import com.genexus.msoffice.excel.poi.xssf.ExcelWorksheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
 public class ExcelSpreadsheetGXWrapper implements IGXError {
     private static final ILogger logger = LogManager.getLogger(ExcelSpreadsheetGXWrapper.class);
@@ -333,4 +334,8 @@ public void setErrDes(String arg0) {
         _errDescription = arg0;
     }
 
+	public XSSFWorkbook getUnderlyingObject(){
+		return _document.getUnderlyingObject();
+
+	}
 }

gxoffice/src/main/java/com/genexus/msoffice/excel/IExcelSpreadsheet.java

@@ -4,6 +4,7 @@
 
 import com.genexus.msoffice.excel.exception.ExcelException;
 import com.genexus.msoffice.excel.poi.xssf.ExcelWorksheet;
+import org.apache.poi.xssf.usermodel.XSSFWorkbook;
 
 public interface IExcelSpreadsheet
 {
@@ -49,4 +50,6 @@ public interface IExcelSpreadsheet
 
 	boolean toggleRow(IExcelWorksheet _currentWorksheet, int i, Boolean visible);
 	boolean cloneSheet(String sheetName, String newSheetName) throws ExcelException;
+
+	XSSFWorkbook getUnderlyingObject();
 }

gxoffice/src/main/java/com/genexus/msoffice/excel/poi/xssf/ExcelCells.java

@@ -1110,4 +1110,9 @@ private void applyBorderSide(XSSFCellStyle cellStyle, BorderCellSide bSide, Exce
     public enum BorderCellSide {
         RIGHT, LEFT, TOP, BOTTOM, DIAGONALUP, DIAGONALDOWN
     }
+
+	public XSSFCell[] getUnderlyingObject(){
+		return pCells;
+
+	}
 }

gxoffice/src/main/java/com/genexus/msoffice/excel/poi/xssf/ExcelSpreadsheet.java

@@ -487,4 +487,8 @@ public boolean toggleRow(IExcelWorksheet worksheet, int i, Boolean visible) {
         return false;
     }
 
+	public XSSFWorkbook getUnderlyingObject(){
+		return _workbook;
+	}
+
 }

gxoffice/src/test/java/com/genexus/msoffice/excel/ExcelSpreadsheetTest.java

@@ -10,6 +10,9 @@
 import java.util.List;
 
 import com.genexus.msoffice.excel.style.ExcelStyle;
+import org.apache.poi.xssf.usermodel.XSSFCell;
+import org.apache.poi.xssf.usermodel.XSSFCellStyle;
+import org.apache.poi.xssf.usermodel.XSSFSheet;
 import org.junit.*;
 
 import com.genexus.msoffice.excel.poi.xssf.ExcelCells;
@@ -1079,6 +1082,32 @@ public void testDateFormat() {
 		excel.close();
 	}
 
+	@Test
+	public void testgetUnderlyingObject(){
+		ExcelSpreadsheetGXWrapper excel = create("testgetUnderlyingObject");
+		org.apache.poi.xssf.usermodel.XSSFWorkbook workbook2 = excel.getUnderlyingObject();
+		XSSFSheet testsheet = workbook2.createSheet("test sheet");
+		workbook2.setActiveSheet(workbook2.getSheetIndex(testsheet));
+		ExcelCells cells = excel.getCells(1,1,1,1);
+		XSSFCell underlyingCells = cells.getUnderlyingObject()[1];
+		underlyingCells.setCellValue("test cell value");
+
+		//test using the same excel instance
+		Assert.assertEquals(excel.getCurrentWorksheet().getName().trim(),"test sheet");
+		cells = excel.getCell(1,1);
+		Assert.assertEquals(cells.getText(),"test cell value");
+
+		excel.save();
+		excel.close();
+
+		//test after saving and opening the file again
+		excel = open("testgetUnderlyingObject");
+		Assert.assertEquals(excel.getCurrentWorksheet().getName().trim(),"test sheet");
+		cells = excel.getCell(1,1);
+		Assert.assertEquals(cells.getText(),"test cell value");
+
+	}
+
     private void logErrorCodes(ExcelSpreadsheetGXWrapper excel) {
        // System.out.println(String.format("%s - %s", excel.getErrCode(), excel.getErrDescription()));
     }
@@ -1096,4 +1125,6 @@ private void ensureFileDoesNotExists(String path){
 		}
 	}
 
+
+
 }