main/src/main/java/org/apache/poi/hssf/usermodel/HSSFOptimiser.java - poi - Git at Google

 /* ====================================================================
    Licensed to the Apache Software Foundation (ASF) under one or more
    contributor license agreements.  See the NOTICE file distributed with
    this work for additional information regarding copyright ownership.
    The ASF licenses this file to You under the Apache License, Version 2.0
    (the "License"); you may not use this file except in compliance with
    the License.  You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
 ==================================================================== */
 package org.apache.poi.hssf.usermodel;

 import java.util.HashSet;

 import org.apache.poi.hssf.record.ExtendedFormatRecord;
 import org.apache.poi.hssf.record.FontRecord;
 import org.apache.poi.hssf.record.StyleRecord;
 import org.apache.poi.hssf.record.common.UnicodeString;
 import org.apache.poi.ss.usermodel.Cell;
 import org.apache.poi.ss.usermodel.CellType;
 import org.apache.poi.ss.usermodel.Row;

 /**
  * Excel can get cranky if you give it files containing too
  *  many (especially duplicate) objects, and this class can
  *  help to avoid those.
  * In general, it's much better to make sure you don't
  *  duplicate the objects in your code, as this is likely
  *  to be much faster than creating lots and lots of
  *  excel objects+records, only to optimise them down to
  *  many fewer at a later stage.
  * However, sometimes this is too hard / tricky to do, which
  *  is where the use of this class comes in.
  */
 public class HSSFOptimiser {
 	/**
 	 * Goes through the Workbook, optimising the fonts by
 	 *  removing duplicate ones.
 	 * For now, only works on fonts used in {@link HSSFCellStyle}
 	 *  and {@link HSSFRichTextString}. Any other font uses
 	 *  (eg charts, pictures) may well end up broken!
 	 * This can be a slow operation, especially if you have
 	 *  lots of cells, cell styles or rich text strings
 	 * @param workbook The workbook in which to optimise the fonts
 	 */
 	public static void optimiseFonts(HSSFWorkbook workbook) {
 		// Where each font has ended up, and if we need to
 		//  delete the record for it. Start off with no change
 		short[] newPos =
 			new short[workbook.getWorkbook().getNumberOfFontRecords()+1];
 		boolean[] zapRecords = new boolean[newPos.length];
 		for(int i=0; i<newPos.length; i++) {
 			newPos[i] = (short)i;
 			zapRecords[i] = false;
 		}

 		// Get each font record, so we can do deletes
 		//  without getting confused
 		FontRecord[] frecs = new FontRecord[newPos.length];
 		for(int i=0; i<newPos.length; i++) {
 			// There is no 4!
 			if(i == 4) continue;

 			frecs[i] = workbook.getWorkbook().getFontRecordAt(i);
 		}

 		// Loop over each font, seeing if it is the same
 		//  as an earlier one. If it is, point users of the
 		//  later duplicate copy to the earlier one, and
 		//  mark the later one as needing deleting
 		// Note - don't change built in fonts (those before 5)
 		for(int i=5; i<newPos.length; i++) {
 			// Check this one for being a duplicate
 			//  of an earlier one
 			int earlierDuplicate = -1;
 			for(int j=0; j<i && earlierDuplicate == -1; j++) {
 				if(j == 4) continue;

 				FontRecord frCheck = workbook.getWorkbook().getFontRecordAt(j);
 				if(frCheck.sameProperties(frecs[i])) {
 					earlierDuplicate = j;
 				}
 			}

 			// If we got a duplicate, mark it as such
 			if(earlierDuplicate != -1) {
 				newPos[i] = (short)earlierDuplicate;
 				zapRecords[i] = true;
 			}
 		}

 		// Update the new positions based on
 		//  deletes that have occurred between
 		//  the start and them
 		// Only need to worry about user fonts
 		for(int i=5; i<newPos.length; i++) {
 			// Find the number deleted to that
 			//  point, and adjust
 			short preDeletePos = newPos[i];
 			short newPosition = preDeletePos;
 			for(int j=0; j<preDeletePos; j++) {
 				if(zapRecords[j]) newPosition--;
 			}

 			// Update the new position
 			newPos[i] = newPosition;
 		}

 		// Zap the un-needed user font records
 		for(int i=5; i<newPos.length; i++) {
 			if(zapRecords[i]) {
 				workbook.getWorkbook().removeFontRecord(
 						frecs[i]
 				);
 			}
 		}

 		// Tell HSSFWorkbook that it needs to
 		//  re-start its HSSFFontCache
 		workbook.resetFontCache();

 		// Update the cell styles to point at the
 		//  new locations of the fonts
 		for(int i=0; i<workbook.getWorkbook().getNumExFormats(); i++) {
 			ExtendedFormatRecord xfr = workbook.getWorkbook().getExFormatAt(i);
 			xfr.setFontIndex(
 					newPos[ xfr.getFontIndex() ]
 			);
 		}

 		// Update the rich text strings to point at
 		//  the new locations of the fonts
 		// Remember that one underlying unicode string
 		//  may be shared by multiple RichTextStrings!
 		HashSet<UnicodeString> doneUnicodeStrings = new HashSet<>();
 		for(int sheetNum=0; sheetNum<workbook.getNumberOfSheets(); sheetNum++) {
 			HSSFSheet s = workbook.getSheetAt(sheetNum);
 			for (Row row : s) {
 			   for (Cell cell : row) {
 					if(cell.getCellType() == CellType.STRING) {
 						HSSFRichTextString rtr = (HSSFRichTextString)cell.getRichStringCellValue();
 						UnicodeString u = rtr.getRawUnicodeString();

 						// Have we done this string already?
 						if(! doneUnicodeStrings.contains(u)) {
 							// Update for each new position
 							for(short i=5; i<newPos.length; i++) {
 								if(i != newPos[i]) {
 									u.swapFontUse(i, newPos[i]);
 								}
 							}

 							// Mark as done
 							doneUnicodeStrings.add(u);
 						}
 					}
 				}
 			}
 		}
 	}

    /**
     * Goes through the Wokrbook, optimising the cell styles
     *  by removing duplicate ones, and ones that aren't used.
     * For best results, optimise the fonts via a call to
     *  {@link #optimiseFonts(HSSFWorkbook)} first.
     * @param workbook The workbook in which to optimise the cell styles
     */
    public static void optimiseCellStyles(HSSFWorkbook workbook) {
        // Where each style has ended up, and if we need to
        //  delete the record for it. Start off with no change
        short[] newPos = new short[workbook.getWorkbook().getNumExFormats()];
        boolean[] isUsed = new boolean[newPos.length];
        boolean[] zapRecords = new boolean[newPos.length];

 	   // to speed up the optimisation for workbooks with a large number of
 	   // styles we perform the isUserDefined() check only once as it is
 	   // costly according to some profiling
 	   boolean[] userDefined = new boolean[newPos.length];

 	   // Get each style record, so we can do deletes
 	   //  without getting confused
 	   ExtendedFormatRecord[] xfrs = new ExtendedFormatRecord[newPos.length];

        for(int i=0; i<newPos.length; i++) {
            isUsed[i] = false;
            newPos[i] = (short)i;
            zapRecords[i] = false;

 		   userDefined[i] = isUserDefined(workbook, i);

 		   xfrs[i] = workbook.getWorkbook().getExFormatAt(i);
        }

 	   // Loop over each style, seeing if it is the same
 	   //  as an earlier one. If it is, point users of the
 	   //  later duplicate copy to the earlier one, and
 	   //  mark the later one as needing deleting
 	   // Only work on user added ones, which come after 20
 	   for (int i = 21; i < newPos.length; i++) {
 		   // Check this one for being a duplicate
 		   //  of an earlier one
 		   int earlierDuplicate = -1;
 		   for (int j = 0; j < i; j++) {
 			   ExtendedFormatRecord xfCheck = workbook.getWorkbook().getExFormatAt(j);
 			   if (xfCheck.equals(xfrs[i]) &&
 					   // never duplicate user defined styles
 					   !userDefined[j]) {
 				   earlierDuplicate = j;
 				   break;
 			   }
 		   }

            // If we got a duplicate, mark it as such
            if(earlierDuplicate != -1) {
                newPos[i] = (short)earlierDuplicate;
                zapRecords[i] = true;
            }
        }

 	   // Loop over all the cells in the file, and identify any user defined
 	   //  styles aren't actually being used (don't touch built-in ones)
 	   for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
 		   HSSFSheet s = workbook.getSheetAt(sheetNum);
 		   for (Row row : s) {
 			   for (Cell cellI : row) {
 				   HSSFCell cell = (HSSFCell) cellI;
 				   short oldXf = cell.getCellValueRecord().getXFIndex();
 				   // some documents contain invalid values here
 				   if(oldXf < newPos.length) {
 					   isUsed[oldXf] = true;
 				   }
 			   }

 			   // also mark row style as being used
 			   short oldXf = ((HSSFRow) row).getRowRecord().getXFIndex();
 			   // some documents contain invalid values here
 			   if(oldXf < newPos.length) {
 				   isUsed[oldXf] = true;
 			   }
 		   }

 		   // also mark column styles as being used
 		   for (int col = s.getSheet().getMinColumnIndex(); col <= s.getSheet().getMaxColumnIndex(); col++) {
 			   short oldXf = s.getSheet().getXFIndexForColAt((short) col);
 			   // some documents contain invalid values here
 			   if(oldXf < newPos.length) {
 				   isUsed[oldXf] = true;
 			   }
 		   }
 	   }

 	   // Propagate isUsed for duplicates and always set user styles to being used to never optimize them away
 	   for (int i = 21; i < isUsed.length; i++) {
 		   // user defined styles are always "used"
 		   if (isUserDefined(workbook, i)) {
 			   isUsed[i] = true;
 		   }

 		   // If we got a duplicate which is used, mark the one we're keeping as used
 		   if(newPos[i] != i && isUsed[i]) {
 		   		isUsed[newPos[i]] = true;
 		   }
 	   }

        // Mark any that aren't used as needing zapping
        for (int i=21; i<isUsed.length; i++) {
            if (! isUsed[i]) {
                // Un-used style, can be removed
                zapRecords[i] = true;
                newPos[i] = 0;
            }
        }

        // Update the new positions based on
        //  deletes that have occurred between
        //  the start and them
        // Only work on user added ones, which come after 20
        for(int i=21; i<newPos.length; i++) {
            // Find the number deleted to that
            //  point, and adjust
            short preDeletePos = newPos[i];
            short newPosition = preDeletePos;
            for(int j=0; j<preDeletePos; j++) {
                if(zapRecords[j]) newPosition--;
            }

 		   // Update the new position
 		   newPos[i] = newPosition;
 		   // also update StyleRecord and Parent-link
 		   if (i != newPosition && newPosition != 0) {
 			   workbook.getWorkbook().updateStyleRecord(i, newPosition);

 			   ExtendedFormatRecord exFormat = workbook.getWorkbook().getExFormatAt(i);
 			   short oldParent = exFormat.getParentIndex();
 			   // some documents contain invalid values here
 			   if(oldParent < newPos.length) {
 				   short newParent = newPos[oldParent];
 				   exFormat.setParentIndex(newParent);
 			   }
 		   }
 	   }

        // Zap the un-needed user style records
        // removing by index, because removing by object may delete
        // styles we did not intend to (the ones that _were_ duplicated and not the duplicates)
        int max = newPos.length;
        int removed = 0; // to adjust index after deletion
        for(int i=21; i<max; i++) {
            if(zapRecords[i + removed]) {
                workbook.getWorkbook().removeExFormatRecord(i);
                i--;
                max--;
                removed++;
            }
        }

 	   // Finally, update the cells to point at their new extended format records
 	   for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
 		   HSSFSheet s = workbook.getSheetAt(sheetNum);
 		   for (Row row : s) {
 			   for (Cell cell : row) {
 				   short oldXf = ((HSSFCell) cell).getCellValueRecord().getXFIndex();
 				   // some documents contain invalid values here
 				   if(oldXf >= newPos.length) {
 				   		continue;
 				   }
 				   HSSFCellStyle newStyle = workbook.getCellStyleAt(newPos[oldXf]);
 				   cell.setCellStyle(newStyle);
 			   }

 			   // adjust row column style
 			   short oldXf = ((HSSFRow) row).getRowRecord().getXFIndex();
 			   // some documents contain invalid values here
 			   if(oldXf >= newPos.length) {
 				   continue;
 			   }
 			   HSSFCellStyle newStyle = workbook.getCellStyleAt(newPos[oldXf]);
 			   row.setRowStyle(newStyle);
 		   }

 		   // adjust cell column style
 		   for (int col = s.getSheet().getMinColumnIndex(); col <= s.getSheet().getMaxColumnIndex(); col++) {
 			   short oldXf = s.getSheet().getXFIndexForColAt((short) col);
 			   // some documents contain invalid values here
 			   if(oldXf >= newPos.length) {
 				   continue;
 			   }
 			   HSSFCellStyle newStyle = workbook.getCellStyleAt(newPos[oldXf]);
 			   s.setDefaultColumnStyle(col, newStyle);
 		   }
 	   }
    }

 	private static boolean isUserDefined(HSSFWorkbook workbook, int index) {
 		StyleRecord styleRecord = workbook.getWorkbook().getStyleRecord(index);
 		return styleRecord != null &&
 				!styleRecord.isBuiltin() &&
 				styleRecord.getName() != null;
 	}
 }
	/* ====================================================================
	Licensed to the Apache Software Foundation (ASF) under one or more
	contributor license agreements. See the NOTICE file distributed with
	this work for additional information regarding copyright ownership.
	The ASF licenses this file to You under the Apache License, Version 2.0
	(the "License"); you may not use this file except in compliance with
	the License. You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
	==================================================================== */
	package org.apache.poi.hssf.usermodel;

	import java.util.HashSet;

	import org.apache.poi.hssf.record.ExtendedFormatRecord;
	import org.apache.poi.hssf.record.FontRecord;
	import org.apache.poi.hssf.record.StyleRecord;
	import org.apache.poi.hssf.record.common.UnicodeString;
	import org.apache.poi.ss.usermodel.Cell;
	import org.apache.poi.ss.usermodel.CellType;
	import org.apache.poi.ss.usermodel.Row;

	/**
	* Excel can get cranky if you give it files containing too
	* many (especially duplicate) objects, and this class can
	* help to avoid those.
	* In general, it's much better to make sure you don't
	* duplicate the objects in your code, as this is likely
	* to be much faster than creating lots and lots of
	* excel objects+records, only to optimise them down to
	* many fewer at a later stage.
	* However, sometimes this is too hard / tricky to do, which
	* is where the use of this class comes in.
	*/
	public class HSSFOptimiser {
	/**
	* Goes through the Workbook, optimising the fonts by
	* removing duplicate ones.
	* For now, only works on fonts used in {@link HSSFCellStyle}
	* and {@link HSSFRichTextString}. Any other font uses
	* (eg charts, pictures) may well end up broken!
	* This can be a slow operation, especially if you have
	* lots of cells, cell styles or rich text strings
	* @param workbook The workbook in which to optimise the fonts
	*/
	public static void optimiseFonts(HSSFWorkbook workbook) {
	// Where each font has ended up, and if we need to
	// delete the record for it. Start off with no change
	short[] newPos =
	new short[workbook.getWorkbook().getNumberOfFontRecords()+1];
	boolean[] zapRecords = new boolean[newPos.length];
	for(int i=0; i<newPos.length; i++) {
	newPos[i] = (short)i;
	zapRecords[i] = false;
	}

	// Get each font record, so we can do deletes
	// without getting confused
	FontRecord[] frecs = new FontRecord[newPos.length];
	for(int i=0; i<newPos.length; i++) {
	// There is no 4!
	if(i == 4) continue;

	frecs[i] = workbook.getWorkbook().getFontRecordAt(i);
	}

	// Loop over each font, seeing if it is the same
	// as an earlier one. If it is, point users of the
	// later duplicate copy to the earlier one, and
	// mark the later one as needing deleting
	// Note - don't change built in fonts (those before 5)
	for(int i=5; i<newPos.length; i++) {
	// Check this one for being a duplicate
	// of an earlier one
	int earlierDuplicate = -1;
	for(int j=0; j<i && earlierDuplicate == -1; j++) {
	if(j == 4) continue;

	FontRecord frCheck = workbook.getWorkbook().getFontRecordAt(j);
	if(frCheck.sameProperties(frecs[i])) {
	earlierDuplicate = j;
	}
	}

	// If we got a duplicate, mark it as such
	if(earlierDuplicate != -1) {
	newPos[i] = (short)earlierDuplicate;
	zapRecords[i] = true;
	}
	}

	// Update the new positions based on
	// deletes that have occurred between
	// the start and them
	// Only need to worry about user fonts
	for(int i=5; i<newPos.length; i++) {
	// Find the number deleted to that
	// point, and adjust
	short preDeletePos = newPos[i];
	short newPosition = preDeletePos;
	for(int j=0; j<preDeletePos; j++) {
	if(zapRecords[j]) newPosition--;
	}

	// Update the new position
	newPos[i] = newPosition;
	}

	// Zap the un-needed user font records
	for(int i=5; i<newPos.length; i++) {
	if(zapRecords[i]) {
	workbook.getWorkbook().removeFontRecord(
	frecs[i]
	);
	}
	}

	// Tell HSSFWorkbook that it needs to
	// re-start its HSSFFontCache
	workbook.resetFontCache();

	// Update the cell styles to point at the
	// new locations of the fonts
	for(int i=0; i<workbook.getWorkbook().getNumExFormats(); i++) {
	ExtendedFormatRecord xfr = workbook.getWorkbook().getExFormatAt(i);
	xfr.setFontIndex(
	newPos[ xfr.getFontIndex() ]
	);
	}

	// Update the rich text strings to point at
	// the new locations of the fonts
	// Remember that one underlying unicode string
	// may be shared by multiple RichTextStrings!
	HashSet<UnicodeString> doneUnicodeStrings = new HashSet<>();
	for(int sheetNum=0; sheetNum<workbook.getNumberOfSheets(); sheetNum++) {
	HSSFSheet s = workbook.getSheetAt(sheetNum);
	for (Row row : s) {
	for (Cell cell : row) {
	if(cell.getCellType() == CellType.STRING) {
	HSSFRichTextString rtr = (HSSFRichTextString)cell.getRichStringCellValue();
	UnicodeString u = rtr.getRawUnicodeString();

	// Have we done this string already?
	if(! doneUnicodeStrings.contains(u)) {
	// Update for each new position
	for(short i=5; i<newPos.length; i++) {
	if(i != newPos[i]) {
	u.swapFontUse(i, newPos[i]);
	}
	}

	// Mark as done
	doneUnicodeStrings.add(u);
	}
	}
	}
	}
	}
	}

	/**
	* Goes through the Wokrbook, optimising the cell styles
	* by removing duplicate ones, and ones that aren't used.
	* For best results, optimise the fonts via a call to
	* {@link #optimiseFonts(HSSFWorkbook)} first.
	* @param workbook The workbook in which to optimise the cell styles
	*/
	public static void optimiseCellStyles(HSSFWorkbook workbook) {
	// Where each style has ended up, and if we need to
	// delete the record for it. Start off with no change
	short[] newPos = new short[workbook.getWorkbook().getNumExFormats()];
	boolean[] isUsed = new boolean[newPos.length];
	boolean[] zapRecords = new boolean[newPos.length];

	// to speed up the optimisation for workbooks with a large number of
	// styles we perform the isUserDefined() check only once as it is
	// costly according to some profiling
	boolean[] userDefined = new boolean[newPos.length];

	// Get each style record, so we can do deletes
	// without getting confused
	ExtendedFormatRecord[] xfrs = new ExtendedFormatRecord[newPos.length];

	for(int i=0; i<newPos.length; i++) {
	isUsed[i] = false;
	newPos[i] = (short)i;
	zapRecords[i] = false;

	userDefined[i] = isUserDefined(workbook, i);

	xfrs[i] = workbook.getWorkbook().getExFormatAt(i);
	}

	// Loop over each style, seeing if it is the same
	// as an earlier one. If it is, point users of the
	// later duplicate copy to the earlier one, and
	// mark the later one as needing deleting
	// Only work on user added ones, which come after 20
	for (int i = 21; i < newPos.length; i++) {
	// Check this one for being a duplicate
	// of an earlier one
	int earlierDuplicate = -1;
	for (int j = 0; j < i; j++) {
	ExtendedFormatRecord xfCheck = workbook.getWorkbook().getExFormatAt(j);
	if (xfCheck.equals(xfrs[i]) &&
	// never duplicate user defined styles
	!userDefined[j]) {
	earlierDuplicate = j;
	break;
	}
	}

	// If we got a duplicate, mark it as such
	if(earlierDuplicate != -1) {
	newPos[i] = (short)earlierDuplicate;
	zapRecords[i] = true;
	}
	}

	// Loop over all the cells in the file, and identify any user defined
	// styles aren't actually being used (don't touch built-in ones)
	for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
	HSSFSheet s = workbook.getSheetAt(sheetNum);
	for (Row row : s) {
	for (Cell cellI : row) {
	HSSFCell cell = (HSSFCell) cellI;
	short oldXf = cell.getCellValueRecord().getXFIndex();
	// some documents contain invalid values here
	if(oldXf < newPos.length) {
	isUsed[oldXf] = true;
	}
	}

	// also mark row style as being used
	short oldXf = ((HSSFRow) row).getRowRecord().getXFIndex();
	// some documents contain invalid values here
	if(oldXf < newPos.length) {
	isUsed[oldXf] = true;
	}
	}

	// also mark column styles as being used
	for (int col = s.getSheet().getMinColumnIndex(); col <= s.getSheet().getMaxColumnIndex(); col++) {
	short oldXf = s.getSheet().getXFIndexForColAt((short) col);
	// some documents contain invalid values here
	if(oldXf < newPos.length) {
	isUsed[oldXf] = true;
	}
	}
	}

	// Propagate isUsed for duplicates and always set user styles to being used to never optimize them away
	for (int i = 21; i < isUsed.length; i++) {
	// user defined styles are always "used"
	if (isUserDefined(workbook, i)) {
	isUsed[i] = true;
	}

	// If we got a duplicate which is used, mark the one we're keeping as used
	if(newPos[i] != i && isUsed[i]) {
	isUsed[newPos[i]] = true;
	}
	}

	// Mark any that aren't used as needing zapping
	for (int i=21; i<isUsed.length; i++) {
	if (! isUsed[i]) {
	// Un-used style, can be removed
	zapRecords[i] = true;
	newPos[i] = 0;
	}
	}

	// Update the new positions based on
	// deletes that have occurred between
	// the start and them
	// Only work on user added ones, which come after 20
	for(int i=21; i<newPos.length; i++) {
	// Find the number deleted to that
	// point, and adjust
	short preDeletePos = newPos[i];
	short newPosition = preDeletePos;
	for(int j=0; j<preDeletePos; j++) {
	if(zapRecords[j]) newPosition--;
	}

	// Update the new position
	newPos[i] = newPosition;
	// also update StyleRecord and Parent-link
	if (i != newPosition && newPosition != 0) {
	workbook.getWorkbook().updateStyleRecord(i, newPosition);

	ExtendedFormatRecord exFormat = workbook.getWorkbook().getExFormatAt(i);
	short oldParent = exFormat.getParentIndex();
	// some documents contain invalid values here
	if(oldParent < newPos.length) {
	short newParent = newPos[oldParent];
	exFormat.setParentIndex(newParent);
	}
	}
	}

	// Zap the un-needed user style records
	// removing by index, because removing by object may delete
	// styles we did not intend to (the ones that _were_ duplicated and not the duplicates)
	int max = newPos.length;
	int removed = 0; // to adjust index after deletion
	for(int i=21; i<max; i++) {
	if(zapRecords[i + removed]) {
	workbook.getWorkbook().removeExFormatRecord(i);
	i--;
	max--;
	removed++;
	}
	}

	// Finally, update the cells to point at their new extended format records
	for (int sheetNum = 0; sheetNum < workbook.getNumberOfSheets(); sheetNum++) {
	HSSFSheet s = workbook.getSheetAt(sheetNum);
	for (Row row : s) {
	for (Cell cell : row) {
	short oldXf = ((HSSFCell) cell).getCellValueRecord().getXFIndex();
	// some documents contain invalid values here
	if(oldXf >= newPos.length) {
	continue;
	}
	HSSFCellStyle newStyle = workbook.getCellStyleAt(newPos[oldXf]);
	cell.setCellStyle(newStyle);
	}

	// adjust row column style
	short oldXf = ((HSSFRow) row).getRowRecord().getXFIndex();
	// some documents contain invalid values here
	if(oldXf >= newPos.length) {
	continue;
	}
	HSSFCellStyle newStyle = workbook.getCellStyleAt(newPos[oldXf]);
	row.setRowStyle(newStyle);
	}

	// adjust cell column style
	for (int col = s.getSheet().getMinColumnIndex(); col <= s.getSheet().getMaxColumnIndex(); col++) {
	short oldXf = s.getSheet().getXFIndexForColAt((short) col);
	// some documents contain invalid values here
	if(oldXf >= newPos.length) {
	continue;
	}
	HSSFCellStyle newStyle = workbook.getCellStyleAt(newPos[oldXf]);
	s.setDefaultColumnStyle(col, newStyle);
	}
	}
	}

	private static boolean isUserDefined(HSSFWorkbook workbook, int index) {
	StyleRecord styleRecord = workbook.getWorkbook().getStyleRecord(index);
	return styleRecord != null &&
	!styleRecord.isBuiltin() &&
	styleRecord.getName() != null;
	}
	}