Allow to specify SpreadsheetVersion when instantiating blank HSSFWorkbook

src/java/org/apache/poi/hssf/model/InternalSheet.java

@@ -70,6 +70,7 @@ import org.apache.poi.hssf.record.aggregates.RecordAggregate.PositionTrackingVis
 import org.apache.poi.hssf.record.aggregates.RecordAggregate.RecordVisitor;
 import org.apache.poi.hssf.record.aggregates.RowRecordsAggregate;
 import org.apache.poi.hssf.record.aggregates.WorksheetProtectionBlock;
+import org.apache.poi.ss.SpreadsheetVersion;
 import org.apache.poi.ss.formula.FormulaShifter;
 import org.apache.poi.ss.util.CellRangeAddress;
 import org.apache.poi.ss.util.PaneInformation;
@@ -444,9 +445,12 @@ public final class InternalSheet {
      * @return Sheet object with all values set to defaults
      */
     public static InternalSheet createSheet() {
-        return new InternalSheet();
+        return new InternalSheet(SpreadsheetVersion.EXCEL97);
     }
-    private InternalSheet() {
+    public static InternalSheet createSheet(final SpreadsheetVersion spreadsheetVersion) {
+        return new InternalSheet(spreadsheetVersion);
+    }
+    private InternalSheet(final SpreadsheetVersion spreadsheetVersion) {
         _mergedCellsTable = new MergedCellsTable();
         List<RecordBase> records = new ArrayList<RecordBase>(32);
 
@@ -487,7 +491,7 @@ public final class InternalSheet {
         _columnInfos = columns;
         _dimensions = createDimensions();
         records.add(_dimensions);
-        _rowsAggregate = new RowRecordsAggregate();
+        _rowsAggregate = new RowRecordsAggregate(spreadsheetVersion);
         records.add(_rowsAggregate);
         // 'Sheet View Settings'
         records.add(windowTwo = createWindowTwo());

src/java/org/apache/poi/hssf/record/aggregates/RowRecordsAggregate.java

@@ -40,6 +40,7 @@ public final class RowRecordsAggregate extends RecordAggregate {
     private final ValueRecordsAggregate _valuesAgg;
     private final List<Record> _unknownRecords;
     private final SharedValueManager _sharedValueManager;
+    private final SpreadsheetVersion _spreadsheetVersion;
 
     // Cache values to speed up performance of
     // getStartRowNumberForBlock / getEndRowNumberForBlock, see Bugzilla 47405
@@ -47,9 +48,15 @@ public final class RowRecordsAggregate extends RecordAggregate {
 
     /** Creates a new instance of ValueRecordsAggregate */
     public RowRecordsAggregate() {
-        this(SharedValueManager.createEmpty());
+        this(SharedValueManager.createEmpty(), SpreadsheetVersion.EXCEL97);
     }
-    private RowRecordsAggregate(SharedValueManager svm) {
+    public RowRecordsAggregate(final SpreadsheetVersion spreadsheetVersion) {
+        this(SharedValueManager.createEmpty(), spreadsheetVersion);
+        if (spreadsheetVersion == null) {
+            throw new IllegalArgumentException("SpreadsheetVersion must be provided.");
+        }
+    }
+    private RowRecordsAggregate(SharedValueManager svm, final SpreadsheetVersion spreadsheetVersion) {
         if (svm == null) {
             throw new IllegalArgumentException("SharedValueManager must be provided.");
         }
@@ -57,6 +64,7 @@ public final class RowRecordsAggregate extends RecordAggregate {
         _valuesAgg = new ValueRecordsAggregate();
         _unknownRecords = new ArrayList<Record>();
         _sharedValueManager = svm;
+        _spreadsheetVersion = spreadsheetVersion;
     }
 
     /**
@@ -66,7 +74,7 @@ public final class RowRecordsAggregate extends RecordAggregate {
      * and table records of the current sheet).  Never <code>null</code>.
      */
     public RowRecordsAggregate(RecordStream rs, SharedValueManager svm) {
-        this(svm);
+        this(svm, SpreadsheetVersion.EXCEL97);
         while(rs.hasNext()) {
             Record rec = rs.getNext();
             switch (rec.getSid()) {
@@ -143,7 +151,7 @@ public final class RowRecordsAggregate extends RecordAggregate {
     }
 
     public RowRecord getRow(int rowIndex) {
-        int maxrow = SpreadsheetVersion.EXCEL97.getLastRowIndex();
+        int maxrow = _spreadsheetVersion.getLastRowIndex();
         if (rowIndex < 0 || rowIndex > maxrow) {
             throw new IllegalArgumentException("The row number must be between 0 and " + maxrow + ", but had: " + rowIndex);
         }

src/java/org/apache/poi/hssf/usermodel/HSSFCell.java

@@ -42,13 +42,7 @@ import org.apache.poi.ss.formula.FormulaType;
 import org.apache.poi.ss.formula.eval.ErrorEval;
 import org.apache.poi.ss.formula.ptg.ExpPtg;
 import org.apache.poi.ss.formula.ptg.Ptg;
-import org.apache.poi.ss.usermodel.Cell;
+import org.apache.poi.ss.usermodel.*;
-import org.apache.poi.ss.usermodel.CellStyle;
-import org.apache.poi.ss.usermodel.CellType;
-import org.apache.poi.ss.usermodel.Comment;
-import org.apache.poi.ss.usermodel.FormulaError;
-import org.apache.poi.ss.usermodel.Hyperlink;
-import org.apache.poi.ss.usermodel.RichTextString;
 import org.apache.poi.ss.util.CellAddress;
 import org.apache.poi.ss.util.CellRangeAddress;
 import org.apache.poi.ss.util.CellReference;
@@ -70,11 +64,6 @@ import org.apache.poi.util.LocaleUtil;
  */
 public class HSSFCell implements Cell {
     private static final String FILE_FORMAT_NAME  = "BIFF8";
-    /**
-     * The maximum  number of columns in BIFF8
-     */
-    public static final int LAST_COLUMN_NUMBER  = SpreadsheetVersion.EXCEL97.getLastColumnIndex(); // 2^8 - 1
-    private static final String LAST_COLUMN_NAME  = SpreadsheetVersion.EXCEL97.getLastColumnName();
 
     public final static short        ENCODING_UNCHANGED          = -1;
     public final static short        ENCODING_COMPRESSED_UNICODE = 0;
@@ -105,7 +94,7 @@ public class HSSFCell implements Cell {
      */
     protected HSSFCell(HSSFWorkbook book, HSSFSheet sheet, int row, short col)
     {
-        checkBounds(col);
+        checkBounds(col, book);
         _stringValue  = null;
         _book    = book;
         _sheet   = sheet;
@@ -150,7 +139,7 @@ public class HSSFCell implements Cell {
     protected HSSFCell(HSSFWorkbook book, HSSFSheet sheet, int row, short col,
                        CellType type)
     {
-        checkBounds(col);
+        checkBounds(col, book);
         _cellType     = CellType._NONE; // Force 'setCellType' to create a first Record
         _stringValue  = null;
         _book    = book;
@@ -570,8 +559,8 @@ public class HSSFCell implements Cell {
             return;
         }
 
-        if(value.length() > SpreadsheetVersion.EXCEL97.getMaxTextLength()){
+        if(value.length() > _book.getSpreadsheetVersion().getMaxTextLength()){
-            throw new IllegalArgumentException("The maximum length of cell contents (text) is 32,767 characters");
+            throw new IllegalArgumentException("The maximum length of cell contents (text) is "+_book.getSpreadsheetVersion().getMaxTextLength()+" characters");
         }
 
         if (_cellType == CellType.FORMULA) {
@@ -977,8 +966,10 @@ public class HSSFCell implements Cell {
     /**
      * @throws RuntimeException if the bounds are exceeded.
      */
-    private static void checkBounds(int cellIndex) {
+    private static void checkBounds(int cellIndex, final HSSFWorkbook book) {
+        final int LAST_COLUMN_NUMBER  = book.getSpreadsheetVersion().getLastColumnIndex(); // 2^8 - 1
         if (cellIndex < 0 || cellIndex > LAST_COLUMN_NUMBER) {
+            final String LAST_COLUMN_NAME  = book.getSpreadsheetVersion().getLastColumnName();
             throw new IllegalArgumentException("Invalid column index (" + cellIndex
                     + ").  Allowable column range for " + FILE_FORMAT_NAME + " is (0.."
                     + LAST_COLUMN_NUMBER + ") or ('A'..'" + LAST_COLUMN_NAME + "')");

src/java/org/apache/poi/hssf/usermodel/HSSFEvaluationWorkbook.java

@@ -296,7 +296,7 @@ public final class HSSFEvaluationWorkbook implements FormulaRenderingWorkbook, E
 
     @Override
     public SpreadsheetVersion getSpreadsheetVersion(){
-        return SpreadsheetVersion.EXCEL97;
+        return _uBook.getSpreadsheetVersion();
     }
 
     /**

src/java/org/apache/poi/hssf/usermodel/HSSFName.java

@@ -129,7 +129,7 @@ public final class HSSFName implements Name {
      * @throws IllegalArgumentException if the name is invalid or the name already exists (case-insensitive)
      */
     public void setNameName(String nameName){
-        validateName(nameName);
+        validateName(nameName, _book.getSpreadsheetVersion());
 
         InternalWorkbook wb = _book.getWorkbook();
         _definedNameRec.setNameText(nameName);
@@ -178,7 +178,7 @@ public final class HSSFName implements Name {
      *
      * @param name
      */
-    private static void validateName(String name) {
+    private static void validateName(String name, SpreadsheetVersion spreadsheetVersion) {
 
         if (name.length() == 0) {
             throw new IllegalArgumentException("Name cannot be blank");
@@ -212,7 +212,7 @@ public final class HSSFName implements Name {
         if (name.matches("[A-Za-z]+\\d+")) {
             String col = name.replaceAll("\\d", "");
             String row = name.replaceAll("[A-Za-z]", "");
-            if (CellReference.cellReferenceIsWithinRange(col, row, SpreadsheetVersion.EXCEL97)) {
+            if (CellReference.cellReferenceIsWithinRange(col, row, spreadsheetVersion)) {
                 throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be $A$1-style cell reference");
             }
         }

src/java/org/apache/poi/hssf/usermodel/HSSFRow.java

@@ -247,7 +247,7 @@ public final class HSSFRow implements Row, Comparable<HSSFRow> {
      */
     @Override
     public void setRowNum(int rowIndex) {
-        int maxrow = SpreadsheetVersion.EXCEL97.getLastRowIndex();
+        int maxrow = book.getSpreadsheetVersion().getLastRowIndex();
         if ((rowIndex < 0) || (rowIndex > maxrow)) {
           throw new IllegalArgumentException("Invalid row number (" + rowIndex
                   + ") outside allowable range (0.." + maxrow + ")");

src/java/org/apache/poi/hssf/usermodel/HSSFSheet.java

@@ -123,7 +123,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
      * @see org.apache.poi.hssf.usermodel.HSSFWorkbook#createSheet()
      */
     protected HSSFSheet(HSSFWorkbook workbook) {
-        _sheet = InternalSheet.createSheet();
+        _sheet = InternalSheet.createSheet(workbook.getSpreadsheetVersion());
         _rows = new TreeMap<Integer, HSSFRow>();
         this._workbook = workbook;
         this._book = workbook.getWorkbook();
@@ -715,7 +715,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
         if (region.getNumberOfCells() < 2) {
             throw new IllegalArgumentException("Merged region " + region.formatAsString() + " must contain 2 or more cells");
         }
-        region.validate(SpreadsheetVersion.EXCEL97);
+        region.validate(_workbook.getSpreadsheetVersion());
 
         if (validate) {
             // throw IllegalStateException if the argument CellRangeAddress intersects with
@@ -1453,7 +1453,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
      */
     @Override
     public void showInPane(int toprow, int leftcol) {
-        int maxrow = SpreadsheetVersion.EXCEL97.getLastRowIndex();
+        final int maxrow = _workbook.getSpreadsheetVersion().getLastRowIndex();
         if (toprow > maxrow) throw new IllegalArgumentException("Maximum row number is " + maxrow);
         
         showInPane((short)toprow, (short)leftcol);
@@ -1530,10 +1530,10 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
      *
      * @param row the row number
      */
-    private static int clip(int row) {
+    private int clip(int row) {
         return Math.min(
                 Math.max(0, row),
-                SpreadsheetVersion.EXCEL97.getLastRowIndex());
+                _workbook.getSpreadsheetVersion().getLastRowIndex());
     }
 
     /**
@@ -1677,7 +1677,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
                 }
             }
             if (endRow + n > _lastrow) {
-                _lastrow = Math.min(endRow + n, SpreadsheetVersion.EXCEL97.getLastRowIndex());
+                _lastrow = Math.min(endRow + n, _workbook.getSpreadsheetVersion().getLastRowIndex());
             }
         } else {
             // Rows are moving up
@@ -1687,7 +1687,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
             if (endRow == _lastrow) {
                 // Need to walk backward to find the last non-blank row
                 // NOTE: n is always negative here
-                _lastrow = Math.min(endRow + n, SpreadsheetVersion.EXCEL97.getLastRowIndex());
+                _lastrow = Math.min(endRow + n, _workbook.getSpreadsheetVersion().getLastRowIndex());
                 for (int i = endRow - 1; i > endRow + n; i--) {
                     if (getRow(i) != null) {
                         _lastrow = i;
@@ -1703,7 +1703,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
         String sheetName = _workbook.getSheetName(sheetIndex);
         short externSheetIndex = _book.checkExternSheet(sheetIndex);
         FormulaShifter shifter = FormulaShifter.createForRowShift(
-                         externSheetIndex, sheetName, startRow, endRow, n, SpreadsheetVersion.EXCEL97);
+                         externSheetIndex, sheetName, startRow, endRow, n, _workbook.getSpreadsheetVersion());
         _sheet.updateFormulasAfterCellShift(shifter, externSheetIndex);
 
         int nSheets = _workbook.getNumberOfSheets();
@@ -1923,7 +1923,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
     @Override
     public void setColumnBreak(int column) {
         validateColumn((short) column);
-        _sheet.getPageSettings().setColumnBreak((short) column, (short) 0, (short) SpreadsheetVersion.EXCEL97.getLastRowIndex());
+        _sheet.getPageSettings().setColumnBreak((short) column, (short) 0, (short) _workbook.getSpreadsheetVersion().getLastRowIndex());
     }
 
     /**
@@ -1953,7 +1953,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
      * @param row the index of the row to validate, zero-based
      */
     protected void validateRow(int row) {
-        int maxrow = SpreadsheetVersion.EXCEL97.getLastRowIndex();
+        final int maxrow = _workbook.getSpreadsheetVersion().getLastRowIndex();
         if (row > maxrow) throw new IllegalArgumentException("Maximum row number is " + maxrow);
         if (row < 0) throw new IllegalArgumentException("Minumum row number is 0");
     }
@@ -1964,7 +1964,7 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
      * @param column the index of the column to validate, zero-based
      */
     protected void validateColumn(int column) {
-        int maxcol = SpreadsheetVersion.EXCEL97.getLastColumnIndex();
+        final int maxcol = _workbook.getSpreadsheetVersion().getLastColumnIndex();
         if (column > maxcol) throw new IllegalArgumentException("Maximum column number is " + maxcol);
         if (column < 0) throw new IllegalArgumentException("Minimum column number is 0");
     }
@@ -2496,8 +2496,8 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
     private void setRepeatingRowsAndColumns(
             CellRangeAddress rowDef, CellRangeAddress colDef) {
         int sheetIndex = _workbook.getSheetIndex(this);
-        int maxRowIndex = SpreadsheetVersion.EXCEL97.getLastRowIndex();
+        final int maxRowIndex = _workbook.getSpreadsheetVersion().getLastRowIndex();
-        int maxColIndex = SpreadsheetVersion.EXCEL97.getLastColumnIndex();
+        final int maxColIndex = _workbook.getSpreadsheetVersion().getLastColumnIndex();
 
         int col1 = -1;
         int col2 = -1;
@@ -2582,8 +2582,8 @@ public final class HSSFSheet implements org.apache.poi.ss.usermodel.Sheet {
             return null;
         }
 
-        int maxRowIndex = SpreadsheetVersion.EXCEL97.getLastRowIndex();
+        final int maxRowIndex = _workbook.getSpreadsheetVersion().getLastRowIndex();
-        int maxColIndex = SpreadsheetVersion.EXCEL97.getLastColumnIndex();
+        final int maxColIndex = _workbook.getSpreadsheetVersion().getLastColumnIndex();
 
         for (Ptg ptg : nameDefinition) {
 

src/java/org/apache/poi/hssf/usermodel/HSSFSheetConditionalFormatting.java

@@ -174,7 +174,7 @@ public final class HSSFSheetConditionalFormatting implements SheetConditionalFor
         if (regions == null) {
             throw new IllegalArgumentException("regions must not be null");
         }
-        for(CellRangeAddress range : regions) range.validate(SpreadsheetVersion.EXCEL97);
+        for(CellRangeAddress range : regions) range.validate(_sheet._workbook.getSpreadsheetVersion());
 
         if (cfRules == null) {
             throw new IllegalArgumentException("cfRules must not be null");

src/java/org/apache/poi/hssf/usermodel/HSSFWorkbook.java

@@ -123,6 +123,9 @@ import org.apache.poi.util.Removal;
 public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss.usermodel.Workbook {
     private static final Pattern COMMA_PATTERN = Pattern.compile(",");
 
+    // org.apache.poi.hssf.usermodel.HSSFWorkbook.spreadsheetVersion
+    public final SpreadsheetVersion spreadsheetVersion;
+
     /**
      * The maximum number of cell styles in a .xls workbook.
      * The 'official' limit is 4,000, but POI allows a slightly larger number.
@@ -207,8 +210,19 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
         this(InternalWorkbook.createWorkbook());
     }
 
+    public HSSFWorkbook(final SpreadsheetVersion spreadsheetVersion) {
+        this(InternalWorkbook.createWorkbook(), spreadsheetVersion);
+        if(spreadsheetVersion == null)
+            throw new IllegalArgumentException("SpreadsheetVersion must be non-null");
+    }
+
     private HSSFWorkbook(InternalWorkbook book) {
+        this(book, SpreadsheetVersion.EXCEL97);
+    }
+
+    private HSSFWorkbook(InternalWorkbook book, final SpreadsheetVersion spreadsheetVersion) {
         super((DirectoryNode)null);
+        this.spreadsheetVersion = spreadsheetVersion;
         workbook = book;
         _sheets = new ArrayList<HSSFSheet>(INITIAL_CAPACITY);
         names = new ArrayList<HSSFName>(INITIAL_CAPACITY);
@@ -328,6 +342,7 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
             throws IOException
     {
         super(directory);
+        spreadsheetVersion = SpreadsheetVersion.EXCEL97;
         String workbookName = getWorkbookDirEntryName(directory);
 
         this.preserveNodes = preserveNodes;
@@ -1363,6 +1378,12 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
         super.close();
     }
 
+    protected void validateSpreadsheetVersionWritePossible() throws IllegalStateException {
+        if (this.spreadsheetVersion != SpreadsheetVersion.EXCEL97) {
+            throw new IllegalStateException("SpreadsheetVersion not EXCEL97, cannot write file meant only for in-memory calculations");
+        }
+    }
+
     /**
      * Write out this workbook to the currently open {@link File} via the
      *  writeable {@link POIFSFileSystem} it was opened as. 
@@ -1375,6 +1396,7 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
      */
     @Override
     public void write() throws IOException {
+        validateSpreadsheetVersionWritePossible();
         validateInPlaceWritePossible();
         final DirectoryNode dir = getDirectory();
         
@@ -1408,6 +1430,7 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
      */
     @Override
     public void write(File newFile) throws IOException {
+        validateSpreadsheetVersionWritePossible();
         POIFSFileSystem fs = POIFSFileSystem.create(newFile);
         try {
             write(fs);
@@ -1434,6 +1457,7 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
      */
     @Override
 	public void write(OutputStream stream) throws IOException {
+        validateSpreadsheetVersionWritePossible();
         NPOIFSFileSystem fs = new NPOIFSFileSystem();
         try {
             write(fs);
@@ -1445,6 +1469,7 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
     
     /** Writes the workbook out to a brand new, empty POIFS */
     private void write(NPOIFSFileSystem fs) throws IOException {
+        validateSpreadsheetVersionWritePossible();
         // For tracking what we've written out, used if we're
         //  going to be preserving nodes
         List<String> excepts = new ArrayList<String>(1);
@@ -2269,6 +2294,27 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
         return recalc != null && recalc.getEngineId() != 0;
     }
 
+    /**
+     * Whether a call to {@link HSSFCell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @param value true if the application will validate the formula is correct
+     * @since 3.17
+     */
+    @Override
+    public void setCellFormulaValidation(final boolean value) {
+        // currently {@link HSSFCell#setCellFormula(String)} does no validation anyway, ignore
+    }
+
+    /**
+     * Whether a call to {@link HSSFCell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @since 3.17
+     */
+    @Override
+    public boolean getCellFormulaValidation() {
+        return false;
+    }
+
 	/**
 	 * Changes an external referenced file to another file.
 	 * A formula in Excel which references a cell in another file is saved in two parts:
@@ -2304,6 +2350,6 @@ public final class HSSFWorkbook extends POIDocument implements org.apache.poi.ss
      */
     @Override
     public SpreadsheetVersion getSpreadsheetVersion() {
-        return SpreadsheetVersion.EXCEL97;
+        return this.spreadsheetVersion;
     }
 }

src/java/org/apache/poi/ss/formula/Formula.java

@@ -35,15 +35,17 @@ import org.apache.poi.util.LittleEndianOutput;
  */
 public class Formula {
 
-	private static final Formula EMPTY = new Formula(new byte[0], 0);
+	private static final Formula EMPTY = new Formula(new byte[0], 0, new Ptg[0]);
 
 	/** immutable */
 	private final byte[] _byteEncoding;
 	private final int _encodedTokenLen;
+	private Ptg[] _cache;
 
-	private Formula(byte[] byteEncoding, int encodedTokenLen) {
+	private Formula(byte[] byteEncoding, int encodedTokenLen, Ptg[] cache) {
 		_byteEncoding = byteEncoding.clone();
 		_encodedTokenLen = encodedTokenLen;
+		_cache = cache;
 //		if (false) { // set to true to eagerly check Ptg decoding
 //			LittleEndianByteArrayInputStream in = new LittleEndianByteArrayInputStream(byteEncoding);
 //			Ptg.readTokens(encodedTokenLen, in);
@@ -74,12 +76,14 @@ public class Formula {
 	public static Formula read(int encodedTokenLen, LittleEndianInput in, int totalEncodedLen) {
 		byte[] byteEncoding = new byte[totalEncodedLen];
 		in.readFully(byteEncoding);
-		return new Formula(byteEncoding, encodedTokenLen);
+		return new Formula(byteEncoding, encodedTokenLen, null);
 	}
 
 	public Ptg[] getTokens() {
+		if(_cache != null)
+			return _cache;
 		LittleEndianInput in = new LittleEndianByteArrayInputStream(_byteEncoding);
-		return Ptg.readTokens(_encodedTokenLen, in);
+		return _cache = Ptg.readTokens(_encodedTokenLen, in);
 	}
 	/**
 	 * Writes  The formula encoding is includes:
@@ -140,7 +144,7 @@ public class Formula {
 		byte[] encodedData = new byte[totalSize];
 		Ptg.serializePtgs(ptgs, encodedData, 0);
 		int encodedTokenLen = Ptg.getEncodedSizeWithoutArrayData(ptgs);
-		return new Formula(encodedData, encodedTokenLen);
+		return new Formula(encodedData, encodedTokenLen, ptgs); // todo: copy ptgs? don't think we need to
 	}
 	/**
 	 * Gets the {@link Ptg} array from the supplied {@link Formula}.

src/java/org/apache/poi/ss/formula/FormulaUsedBlankCellSet.java

@@ -28,7 +28,7 @@ import org.apache.poi.ss.util.CellReference;
  * Optimization - compacts many blank cell references used by a single formula.
  */
 final class FormulaUsedBlankCellSet {
-	public static final class BookSheetKey {
+	public static final class BookSheetKey {// 253mb 10,567,793
 
 		private final int _bookIndex;
 		private final int _sheetIndex;

src/java/org/apache/poi/ss/formula/ptg/NamePtg.java

@@ -44,7 +44,7 @@ public final class NamePtg extends OperandPtg implements WorkbookDependentFormul
 	/** Creates new NamePtg */
 
 	public NamePtg(LittleEndianInput in)  {
-		field_1_label_index = in.readShort();
+		field_1_label_index = in.readUShort();
 		field_2_zero = in.readShort();
 	}
 

src/java/org/apache/poi/ss/usermodel/Workbook.java

@@ -686,4 +686,19 @@ public interface Workbook extends Closeable, Iterable<Sheet> {
      * @throws IOException if the object can't be embedded
      */
     int addOlePackage(byte[] oleData, String label, String fileName, String command) throws IOException;
+
+    /**
+     * Whether a call to {@link Cell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @param value true if the application will validate the formula is correct
+     * @since 3.17
+     */
+    void setCellFormulaValidation(boolean value);
+
+    /**
+     * Whether a call to {@link Cell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @since 3.17
+     */
+    boolean getCellFormulaValidation();
 }

src/java/org/apache/poi/ss/util/CellReference.java

@@ -88,9 +88,9 @@ public class CellReference {
      * digits or dot.  (They can even end in dot).
      */
     private static final Pattern NAMED_RANGE_NAME_PATTERN = Pattern.compile("[_A-Z][_.A-Z0-9]*", Pattern.CASE_INSENSITIVE);
-    //private static final String BIFF8_LAST_COLUMN = SpreadsheetVersion.EXCEL97.getLastColumnName();
+    //private static final String BIFF8_LAST_COLUMN = org.apache.poi.hssf.usermodel.HSSFWorkbook.spreadsheetVersion.getLastColumnName();
     //private static final int BIFF8_LAST_COLUMN_TEXT_LEN = BIFF8_LAST_COLUMN.length();
-    //private static final String BIFF8_LAST_ROW = String.valueOf(SpreadsheetVersion.EXCEL97.getMaxRows());
+    //private static final String BIFF8_LAST_ROW = String.valueOf(org.apache.poi.hssf.usermodel.HSSFWorkbook.spreadsheetVersion.getMaxRows());
     //private static final int BIFF8_LAST_ROW_TEXT_LEN = BIFF8_LAST_ROW.length();
 
     // FIXME: _sheetName may be null, depending on the entry point.

src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFWorkbook.java

@@ -1364,5 +1364,26 @@ public class SXSSFWorkbook implements Workbook {
         return _wb.addOlePackage(oleData, label, fileName, command);
     }
 
+    /**
+     * Whether a call to {@link SXSSFCell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @param value true if the application will validate the formula is correct
+     * @since 3.17
+     */
+    @Override
+    public void setCellFormulaValidation(final boolean value) {
+        // currently {@link SXSSFCell#setCellFormula(String)} does no validation anyway, ignore
+    }
+
+    /**
+     * Whether a call to {@link SXSSFCell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @since 3.17
+     */
+    @Override
+    public boolean getCellFormulaValidation() {
+        return false;
+    }
+
 //end of interface implementation
 }

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFCell.java

@@ -561,9 +561,11 @@ public final class XSSFCell implements Cell {
             return;
         }
 
+        if(wb.getCellFormulaValidation()) {
             XSSFEvaluationWorkbook fpb = XSSFEvaluationWorkbook.create(wb);
             //validate through the FormulaParser
             FormulaParser.parse(formula, fpb, formulaType, wb.getSheetIndex(getSheet()), getRowIndex());
+        }
 
         CTCellFormula f = CTCellFormula.Factory.newInstance();
         f.setStringValue(formula);

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFName.java

@@ -402,7 +402,7 @@ public final class XSSFName implements Name {
         if (name.matches("[A-Za-z]+\\d+")) {
             String col = name.replaceAll("\\d", "");
             String row = name.replaceAll("[A-Za-z]", "");
-            if (CellReference.cellReferenceIsWithinRange(col, row, SpreadsheetVersion.EXCEL97)) {
+            if (CellReference.cellReferenceIsWithinRange(col, row, SpreadsheetVersion.EXCEL97)) { // todo: is EXCEL97 correct? sounds wrong...
                 throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be $A$1-style cell reference");
             }
         }

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFWorkbook.java

@@ -208,6 +208,11 @@ public class XSSFWorkbook extends POIXMLDocument implements Workbook {
      */
     private MissingCellPolicy _missingCellPolicy = MissingCellPolicy.RETURN_NULL_AND_BLANK;
 
+    /**
+     * Whether a call to {@link XSSFCell#setCellFormula(String)} will validate the formula or not.
+     */
+    private boolean cellFormulaValidation = true;
+
     /**
      * array of pictures for this workbook
      */
@@ -2470,4 +2475,25 @@ public class XSSFWorkbook extends POIXMLDocument implements Workbook {
 
         return oleId;
     }
+
+    /**
+     * Whether a call to {@link XSSFCell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @param value true if the application will validate the formula is correct
+     * @since 3.17
+     */
+    @Override
+    public void setCellFormulaValidation(final boolean value) {
+        this.cellFormulaValidation = value;
+    }
+
+    /**
+     * Whether a call to {@link XSSFCell#setCellFormula(String)} will validate the formula or not.
+     *
+     * @since 3.17
+     */
+    @Override
+    public boolean getCellFormulaValidation() {
+        return this.cellFormulaValidation;
+    }
 }

src/ooxml/testcases/org/apache/poi/xssf/usermodel/TestXSSFCell.java

@@ -23,6 +23,7 @@ import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
 
 import java.io.IOException;
 import java.util.List;
@@ -30,6 +31,7 @@ import java.util.List;
 import org.apache.poi.common.usermodel.HyperlinkType;
 import org.apache.poi.hssf.HSSFITestDataProvider;
 import org.apache.poi.ss.SpreadsheetVersion;
+import org.apache.poi.ss.formula.FormulaParseException;
 import org.apache.poi.ss.usermodel.BaseTestXCell;
 import org.apache.poi.ss.usermodel.BorderStyle;
 import org.apache.poi.ss.usermodel.Cell;
@@ -179,6 +181,42 @@ public final class TestXSSFCell extends BaseTestXCell {
             assertEquals(CellType.BLANK, cell.getCellTypeEnum());
             assertEquals(STCellType.N, ctCell.getT());
             assertEquals("", cell.getStringCellValue());
+
+            // check behavior with setCellFormulaValidation
+            final String invalidFormula = "A", validFormula = "A2";
+            FormulaParseException fpe = null;
+            // check that default is true
+            assertTrue(wb.getCellFormulaValidation());
+
+            // check that valid formula does not throw exception
+            try {
+                cell.setCellFormula(validFormula);
+            } catch(FormulaParseException e) {
+                fpe = e;
+            }
+            assertNull(fpe);
+
+            // check that invalid formula does throw exception
+            try {
+                cell.setCellFormula(invalidFormula);
+            } catch(FormulaParseException e) {
+                fpe = e;
+            }
+            assertNotNull(fpe);
+            fpe = null;
+
+            // set cell formula validation to false
+            wb.setCellFormulaValidation(false);
+            assertFalse(wb.getCellFormulaValidation());
+
+            // check that neither valid nor invalid formula throw an exception
+            try {
+                cell.setCellFormula(validFormula);
+                cell.setCellFormula(invalidFormula);
+            } catch(FormulaParseException e) {
+                fpe = e;
+            }
+            assertNull(fpe);
         } finally {
             wb.close();
         }