--- HSSFWorkbook.java	Tue Sep 30 16:32:37 2008	700479
+++ HSSFWorkbook.java	Tue Sep 30 16:43:14 2008
@@ -235,0 +236,15 @@
+     * This method is invoked by all HSSFWorkbook constructors with IO access
+     * when a new sheet must be created.
+     * ## Override this in derived classes for custom derived sheet classes ##
+     * Just pass on the parameters to an HSSFSheet-derived-class constructor
+     * @param pBook - The HSSF Workbook object associated with the sheet.
+     * @param pSheet - lowlevel Sheet object this sheet will represent
+     * @return a new HSSFSheet
+     */
+    protected HSSFSheet HSSFSheetFactory (HSSFWorkbook pBook, Sheet pSheet)
+    {
+       return new HSSFSheet (pBook, pSheet);
+    }
+    
+    
+    /**
@@ -283 +298 @@
-            _sheets.add(new HSSFSheet(this, sheet));
+            _sheets.add(HSSFSheetFactory(this, sheet));
@@ -627,0 +643,2 @@
+     * You can override this in derived classes for custom derived sheet classes,
+     * but it's not necessary, as createSheet(String) is used.
@@ -634 +651,9 @@
-        HSSFSheet sheet = new HSSFSheet(this);
+      //        HSSFSheet sheet = new HSSFSheet(this);
+      //
+      //        _sheets.add(sheet);
+      //        workbook.setSheetName(_sheets.size() - 1, "Sheet" + (_sheets.size() - 1));
+      //        boolean isOnlySheet = _sheets.size() == 1;
+      //        sheet.setSelected(isOnlySheet);
+      //        sheet.setActive(isOnlySheet);
+      //        return sheet;
+             return createSheet (null);    }
@@ -636,8 +660,0 @@
-        _sheets.add(sheet);
-        workbook.setSheetName(_sheets.size() - 1, "Sheet" + (_sheets.size() - 1));
-        boolean isOnlySheet = _sheets.size() == 1;
-        sheet.setSelected(isOnlySheet);
-        sheet.setActive(isOnlySheet);
-        return sheet;
-    }
-
@@ -729,0 +747 @@
+     * ## Override this in derived classes for custom derived sheet classes ##
@@ -738,0 +757 @@
+
@@ -741,11 +760,11 @@
-        if (workbook.doesContainsSheetName( sheetname, _sheets.size() ))
-            throw new IllegalArgumentException( "The workbook already contains a sheet of this name" );
-
-        HSSFSheet sheet = new HSSFSheet(this);
-
-        _sheets.add(sheet);
-        workbook.setSheetName(_sheets.size() - 1, sheetname);
-        boolean isOnlySheet = _sheets.size() == 1;
-        sheet.setSelected(isOnlySheet);
-        sheet.setActive(isOnlySheet);
-        return sheet;
+      //        if (workbook.doesContainsSheetName( sheetname, _sheets.size() ))
+      //            throw new IllegalArgumentException( "The workbook already contains a sheet of this name" );
+      //
+      //        HSSFSheet sheet = new HSSFSheet(this);
+      //
+      //        _sheets.add(sheet);
+      //        workbook.setSheetName(_sheets.size() - 1, sheetname);
+      //        boolean isOnlySheet = _sheets.size() == 1;
+      //        sheet.setSelected(isOnlySheet);
+      //        sheet.setActive(isOnlySheet);
+              return new HSSFSheet(this, sheetname);