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Fixed ExtSST serialization (length not calculated correctly)

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Implemented DBCellRecord and IndexRecord serialization

Can now import into MS Access. Cool! Both of the above fixes were required to make this work.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353356 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jason Height 2003-09-18 02:10:50 +00:00
parent dc4dd18965
commit e418e8688e
10 changed files with 290 additions and 242 deletions
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265
src/java/org/apache/poi/hssf/model/Sheet.java
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@ -288,6 +288,15 @@ public class Sheet implements Model
{
retval.windowTwo = (WindowTwoRecord) rec;
}
else if ( rec.getSid() == DBCellRecord.sid )
{
rec = null;
}
else if ( rec.getSid() == IndexRecord.sid )
{
rec = null;
}
if (rec != null)
{
@ -700,49 +709,6 @@ public class Sheet implements Model
return preoffset;
}
/**
* Serializes all records in the sheet into one big byte array. Use this to write
* the sheet out.
*
* @return byte[] array containing the binary representation of the records in this sheet
*
*/
public byte [] serialize()
{
log.log(log.DEBUG, "Sheet.serialize");
// addDBCellRecords();
byte[] retval = null;
// ArrayList bytes = new ArrayList(4096);
int arraysize = getSize();
int pos = 0;
// for (int k = 0; k < records.size(); k++)
// {
// bytes.add((( Record ) records.get(k)).serialize());
//
// }
// for (int k = 0; k < bytes.size(); k++)
// {
// arraysize += (( byte [] ) bytes.get(k)).length;
// log.debug((new StringBuffer("arraysize=")).append(arraysize)
// .toString());
// }
retval = new byte[ arraysize ];
for (int k = 0; k < records.size(); k++)
{
// byte[] rec = (( byte [] ) bytes.get(k));
// System.arraycopy(rec, 0, retval, pos, rec.length);
pos += (( Record ) records.get(k)).serialize(pos,
retval); // rec.length;
}
log.log(log.DEBUG, "Sheet.serialize returning " + retval);
return retval;
}
/**
* Serializes all records in the sheet into one big byte array. Use this to write
* the sheet out.
@ -756,40 +722,69 @@ public class Sheet implements Model
{
log.log(log.DEBUG, "Sheet.serialize using offsets");
// addDBCellRecords();
// ArrayList bytes = new ArrayList(4096);
// int arraysize = getSize(); // 0;
int pos = 0;
// for (int k = 0; k < records.size(); k++)
// {
// bytes.add((( Record ) records.get(k)).serialize());
//
// }
// for (int k = 0; k < bytes.size(); k++)
// {
// arraysize += (( byte [] ) bytes.get(k)).length;
// log.debug((new StringBuffer("arraysize=")).append(arraysize)
// .toString());
// }
int pos = offset;
boolean haveSerializedIndex = false;
for (int k = 0; k < records.size(); k++)
{
// byte[] rec = (( byte [] ) bytes.get(k));
// System.arraycopy(rec, 0, data, offset + pos, rec.length);
Record record = (( Record ) records.get(k));
int startPos = pos;
//Once the rows have been found in the list of records, start
//writing out the blocked row information. This includes the DBCell references
if (record instanceof RowRecordsAggregate) {
pos += ((RowRecordsAggregate)record).serialize(pos, data, cells); // rec.length;
} else if (record instanceof ValueRecordsAggregate) {
//Do nothing here. The records were serialized during the RowRecordAggregate block serialization
} else {
pos += record.serialize(pos, data ); // rec.length;
}
//uncomment to test record sizes
// byte[] data2 = new byte[record.getRecordSize()];
// record.serialize(0, data2 ); // rec.length;
// if (LittleEndian.getUShort(data2, 2) != record.getRecordSize() - 4
// && record instanceof RowRecordsAggregate == false && record instanceof ValueRecordsAggregate == false)
// throw new RuntimeException("Blah!!!");
pos += record.serialize(pos + offset, data ); // rec.length;
//If the BOF record was just serialized then add the IndexRecord
if (record.getSid() == BOFRecord.sid) {
//Can there be more than one BOF for a sheet? If not then we can
//remove this guard. So be safe it is left here.
if (!haveSerializedIndex) {
haveSerializedIndex = true;
pos += serializeIndexRecord(k, pos, data);
}
}
}
log.log(log.DEBUG, "Sheet.serialize returning ");
return pos;
return pos-offset;
}
private int serializeIndexRecord(final int BOFRecordIndex, final int offset, byte[] data) {
IndexRecord index = new IndexRecord();
index.setFirstRow(rows.getFirstRowNum());
index.setLastRowAdd1(rows.getLastRowNum()+1);
//Calculate the size of the records from the end of the BOF
//and up to the RowRecordsAggregate...
int sheetRecSize = 0;
for (int j = BOFRecordIndex+1; j < records.size(); j++)
{
Record tmpRec = (( Record ) records.get(j));
if (tmpRec instanceof RowRecordsAggregate)
break;
sheetRecSize+= tmpRec.getRecordSize();
}
//Add the references to the DBCells in the IndexRecord (one for each block)
int blockCount = rows.getRowBlockCount();
//Calculate the size of this IndexRecord
int indexRecSize = index.getRecordSizeForBlockCount(blockCount);
int rowBlockOffset = 0;
int cellBlockOffset = 0;
int dbCellOffset = 0;
for (int block=0;block<blockCount;block++) {
rowBlockOffset += rows.getRowBlockSize(block);
cellBlockOffset += cells.getRowCellBlockSize(rows.getStartRowNumberForBlock(block),
rows.getEndRowNumberForBlock(block));
//Note: The offsets are relative to the Workbook BOF. Assume that this is
//0 for now.....
index.addDbcell(offset + indexRecSize + sheetRecSize + dbCellOffset + rowBlockOffset + cellBlockOffset);
//Add space required to write the dbcell record(s) (whose references were just added).
dbCellOffset += (8 + (rows.getRowCountForBlock(block) * 2));
}
return index.serialize(offset, data);
}
/**
@ -1369,84 +1364,6 @@ public class Sheet implements Model
return this.cells.getRowCellIterator(row);
}
/**
* Not currently used method to calculate and add dbcell records
*
*/
public void addDBCellRecords()
{
int offset = 0;
int recnum = 0;
int rownum = 0;
//int lastrow = 0;
//long lastrowoffset = 0;
IndexRecord index = null;
// ArrayList rowOffsets = new ArrayList();
IntList rowOffsets = new IntList();
for (recnum = 0; recnum < records.size(); recnum++)
{
Record rec = ( Record ) records.get(recnum);
if (rec.getSid() == IndexRecord.sid)
{
index = ( IndexRecord ) rec;
}
if (rec.getSid() != RowRecord.sid)
{
offset += rec.serialize().length;
}
else
{
break;
}
}
// First Row Record
for (; recnum < records.size(); recnum++)
{
Record rec = ( Record ) records.get(recnum);
if (rec.getSid() == RowRecord.sid)
{
rownum++;
rowOffsets.add(offset);
if ((rownum % 32) == 0)
{
// if this is the last rec in a dbcell block
// find the next row or last value record
for (int rn = recnum; rn < records.size(); rn++)
{
rec = ( Record ) records.get(rn);
if ((!rec.isInValueSection())
|| (rec.getSid() == RowRecord.sid))
{
// here is the next row or last value record
records.add(rn,
createDBCell(offset, rowOffsets,
index));
recnum = rn;
break;
}
}
}
else
{
}
}
if (!rec.isInValueSection())
{
records.add(recnum, createDBCell(offset, rowOffsets, index));
break;
}
offset += rec.serialize().length;
}
}
public int getFirstRow() {
return rows.getFirstRowNum();
}
@ -1455,41 +1372,6 @@ public class Sheet implements Model
return rows.getLastRowNum();
}
/** not currently used */
private DBCellRecord createDBCell(int offset, IntList rowoffsets,
IndexRecord index)
{
DBCellRecord rec = new DBCellRecord();
rec.setRowOffset(offset - rowoffsets.get(0));
// test hack
rec.addCellOffset(( short ) 0x0);
// end test hack
addDbCellToIndex(offset, index);
return rec;
}
/** not currently used */
private void addDbCellToIndex(int offset, IndexRecord index)
{
int numdbcells = index.getNumDbcells() + 1;
index.addDbcell(offset + preoffset);
// stupid but whenever we add an offset that causes everything to be shifted down 4
for (int k = 0; k < numdbcells; k++)
{
int dbval = index.getDbcellAt(k);
index.setDbcell(k, dbval + 4);
}
}
/**
* creates the BOF record
* @see org.apache.poi.hssf.record.BOFRecord
@ -2238,6 +2120,21 @@ public class Sheet implements Model
{
retval += (( Record ) records.get(k)).getRecordSize();
}
//Add space for the IndexRecord
final int blocks = rows.getRowBlockCount();
retval += IndexRecord.getRecordSizeForBlockCount(blocks);
//Add space for the DBCell records
//Once DBCell per block.
//8 bytes per DBCell (non variable section)
//2 bytes per row reference
int startRetVal = retval;
retval += (8 * blocks);
for (Iterator itr = rows.getIterator(); itr.hasNext();) {
RowRecord row = (RowRecord)itr.next();
if (cells.rowHasCells(row.getRowNumber()))
retval += 2;
}
return retval;
}

13
src/java/org/apache/poi/hssf/record/DBCellRecord.java
View File

@ -58,16 +58,18 @@ package org.apache.poi.hssf.record;
import org.apache.poi.util.LittleEndian;
/**
* Title: DBCell Record (Currently read only. Not required.)
* Description: Used to find rows in blocks...TODO<P>
* Title: DBCell Record
* Description: Used by Excel and other MS apps to quickly find rows in the sheets.<P>
* REFERENCE: PG 299/440 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)<P>
* @author Andrew C. Oliver (acoliver at apache dot org)
* @author Jason Height
* @version 2.0-pre
*/
public class DBCellRecord
extends Record
{
public final static int BLOCK_SIZE = 32;
public final static short sid = 0xd7;
private int field_1_row_offset;
private short[] field_2_cell_offsets;
@ -217,7 +219,7 @@ public class DBCellRecord
LittleEndian.putInt(data, 4 + offset, getRowOffset());
for (int k = 0; k < getNumCellOffsets(); k++)
{
LittleEndian.putShort(data, 8 + k + offset, getCellOffsetAt(k));
LittleEndian.putShort(data, 8 + 2*k + offset, getCellOffsetAt(k));
}
return getRecordSize();
}
@ -227,6 +229,11 @@ public class DBCellRecord
return 8 + (getNumCellOffsets() * 2);
}
/** Returns the size of a DBCellRecord when it needs to reference a certain number of rows*/
public static int getRecordSizeForRows(int rows) {
return 8 + (rows * 2);
}
public short getSid()
{
return this.sid;

2
src/java/org/apache/poi/hssf/record/ExtSSTInfoSubRecord.java
View File

@ -65,8 +65,8 @@ import org.apache.poi.util.LittleEndian;
/**
* Extended SST table info subrecord<P>
* contains the elements of "info" in the SST's array field<P>
* WE HAVE VERY LITTLE INFORMATION ON HOW TO IMPLEMENT THIS RECORD! (EXTSSST)<P>
* @author Andrew C. Oliver (acoliver at apache dot org)
* @author Jason Height
* @version 2.0-pre
* @see org.apache.poi.hssf.record.ExtSSTRecord
*/

26
src/java/org/apache/poi/hssf/record/ExtSSTRecord.java
View File

@ -61,13 +61,13 @@ import java.util.ArrayList;
/**
* Title: Extended Static String Table<P>
* Description: I really don't understand this thing... its supposed to be "a hash
* table for optimizing external copy operations" --
*<P>
* This sounds like a job for Marc "BitMaster" Johnson aka the
* "Hawaiian Master Chef".<P>
* Description: This record is used for a quick lookup into the SST record. This
* record breaks the SST table into a set of buckets. The offsets
* to these buckets within the SST record are kept as well as the
* position relative to the start of the SST record.
* REFERENCE: PG 313 Microsoft Excel 97 Developer's Kit (ISBN: 1-57231-498-2)<P>
* @author Andrew C. Oliver (acoliver at apache dot org)
* @author Jason Height
* @version 2.0-pre
* @see org.apache.poi.hssf.record.ExtSSTInfoSubRecord
*/
@ -75,8 +75,9 @@ import java.util.ArrayList;
public class ExtSSTRecord
extends Record
{
private static final int DEFAULT_BUCKET_SIZE = 8;
public final static short sid = 0xff;
private short field_1_strings_per_bucket;
private short field_1_strings_per_bucket = DEFAULT_BUCKET_SIZE;
private ArrayList field_2_sst_info;
@ -120,12 +121,11 @@ public class ExtSSTRecord
}
}
// this probably doesn't work but we don't really care at this point
protected void fillFields(byte [] data, short size, int offset)
{
field_2_sst_info = new ArrayList();
field_1_strings_per_bucket = LittleEndian.getShort(data, 0 + offset);
for (int k = 2; k < ((data.length - offset) - size); k += 8)
for (int k = 2; k < (size-offset); k += 8)
{
byte[] tempdata = new byte[ 8 + offset ];
@ -196,16 +196,16 @@ public class ExtSSTRecord
for (int k = 0; k < getNumInfoRecords(); k++)
{
System.arraycopy(getInfoRecordAt(k).serialize(), 0, data,
pos + offset, 8);
pos += getInfoRecordAt(k).getRecordSize();
ExtSSTInfoSubRecord rec = getInfoRecordAt(k);
pos += rec.serialize(pos + offset, data);
}
return getRecordSize();
return pos;
}
public int getRecordSize()
{
return 4 + 2 + field_2_sst_info.size() * 8;
return 6+8*getNumInfoRecords();
}
public short getSid()

7
src/java/org/apache/poi/hssf/record/IndexRecord.java
View File

@ -222,6 +222,13 @@ public class IndexRecord
return 20 + (getNumDbcells() * 4);
}
/** Returns the size of an INdexRecord when it needs to index the specified number of blocks
*
*/
public static int getRecordSizeForBlockCount(int blockCount) {
return 20 + (4 * blockCount);
}
public short getSid()
{
return this.sid;

1
src/java/org/apache/poi/hssf/record/SSTDeserializer.java
View File

@ -249,7 +249,6 @@ class SSTDeserializer
*/
static public void addToStringTable( BinaryTree strings, Integer integer, UnicodeString string )
{
if ( string.isRichText() )
string.setOptionFlags( (byte) ( string.getOptionFlags() & ( ~8 ) ) );
if ( string.isExtendedText() )

5
src/java/org/apache/poi/hssf/record/SSTRecord.java
View File

@ -586,7 +586,10 @@ public class SSTRecord
*/
public int calcExtSSTRecordSize()
{
return 4 + 2 + ((field_3_strings.size() / SSTSerializer.DEFAULT_BUCKET_SIZE) + 1) * 8;
int infoRecs = (field_3_strings.size() / SSTSerializer.DEFAULT_BUCKET_SIZE);
if ((field_3_strings.size() % SSTSerializer.DEFAULT_BUCKET_SIZE) != 0)
infoRecs ++;
return 4 + 2 + (infoRecs * 8);
}
}

7
src/java/org/apache/poi/hssf/record/SSTSerializer.java
View File

@ -93,8 +93,11 @@ class SSTSerializer
this.numUniqueStrings = numUniqueStrings;
this.sstRecordHeader = new SSTRecordHeader( numStrings, numUniqueStrings );
this.bucketAbsoluteOffsets = new int[strings.size()/DEFAULT_BUCKET_SIZE+1];
this.bucketRelativeOffsets = new int[strings.size()/DEFAULT_BUCKET_SIZE+1];
int infoRecs = (strings.size() / SSTSerializer.DEFAULT_BUCKET_SIZE);
if ((strings.size() % SSTSerializer.DEFAULT_BUCKET_SIZE) != 0)
infoRecs ++;
this.bucketAbsoluteOffsets = new int[infoRecs];
this.bucketRelativeOffsets = new int[infoRecs];
}
/**

113
src/java/org/apache/poi/hssf/record/aggregates/RowRecordsAggregate.java
View File

@ -57,6 +57,7 @@ package org.apache.poi.hssf.record.aggregates;
import org.apache.poi.hssf.record.Record;
import org.apache.poi.hssf.record.RowRecord;
import org.apache.poi.hssf.record.DBCellRecord;
import org.apache.poi.hssf.record.UnknownRecord;
import java.util.Map;
@ -169,6 +170,86 @@ public class RowRecordsAggregate
return k;
}
/** Returns the number of row blocks.
* <p/>The row blocks are goupings of rows that contain the DBCell record
* after them
*/
public int getRowBlockCount() {
int size = records.size()/DBCellRecord.BLOCK_SIZE;
if ((records.size() % DBCellRecord.BLOCK_SIZE) != 0)
size++;
return size;
}
public int getRowBlockSize(int block) {
return 20 * getRowCountForBlock(block);
}
/** Returns the number of physical rows within a block*/
public int getRowCountForBlock(int block) {
int startIndex = block * DBCellRecord.BLOCK_SIZE;
int endIndex = startIndex + DBCellRecord.BLOCK_SIZE - 1;
if (endIndex >= records.size())
endIndex = records.size()-1;
return endIndex-startIndex+1;
}
/** Returns the physical row number of the first row in a block*/
public int getStartRowNumberForBlock(int block) {
//JMH Damn! I would like to directly index a record in the map rather than
//iterating through it.
int startIndex = block * DBCellRecord.BLOCK_SIZE;
Iterator rowIter = records.values().iterator();
RowRecord row = null;
//Position the iterator at the start of the block
for (int i=0; i<=startIndex;i++) {
row = (RowRecord)rowIter.next();
}
return row.getRowNumber();
}
/** Returns the physical row number of the end row in a block*/
public int getEndRowNumberForBlock(int block) {
//JMH Damn! I would like to directly index a record in the map rather than
//iterating through it.
int endIndex = ((block + 1)*DBCellRecord.BLOCK_SIZE)-1;
if (endIndex >= records.size())
endIndex = records.size()-1;
Iterator rowIter = records.values().iterator();
RowRecord row = null;
for (int i=0; i<=endIndex;i++) {
row = (RowRecord)rowIter.next();
}
return row.getRowNumber();
}
/** Serializes a block of the rows */
private int serializeRowBlock(final int block, final int offset, byte[] data) {
final int startIndex = block*DBCellRecord.BLOCK_SIZE;
final int endIndex = startIndex + DBCellRecord.BLOCK_SIZE;
Iterator rowIterator = records.values().iterator();
int pos = offset;
//JMH TBD create an iterator that can start at a specific index.
int i=0;
for (;i<startIndex;i++)
rowIterator.next();
while(rowIterator.hasNext() && (i++ < endIndex)) {
RowRecord row = (RowRecord)rowIterator.next();
pos += row.serialize(pos, data);
}
return pos - offset;
}
public int serialize(int offset, byte [] data) {
throw new RuntimeException("The serialize method that passes in cells should be used");
}
/**
* called by the class that is responsible for writing this sucker.
* Subclasses should implement this so that their data is passed back in a
@ -179,14 +260,38 @@ public class RowRecordsAggregate
* @return number of bytes written
*/
public int serialize(int offset, byte [] data)
public int serialize(int offset, byte [] data, ValueRecordsAggregate cells)
{
Iterator itr = records.values().iterator();
int pos = offset;
while (itr.hasNext())
{
pos += (( Record ) itr.next()).serialize(pos, data);
//DBCells are serialized before row records.
final int blockCount = getRowBlockCount();
for (int block=0;block<blockCount;block++) {
//Serialize a block of rows.
//Hold onto the position of the first row in the block
final int rowStartPos = pos;
//Hold onto the size of this block that was serialized
final int rowBlockSize = serializeRowBlock(block, pos, data);
pos += rowBlockSize;
//Serialize a block of cells for those rows
final int startRowNumber = getStartRowNumberForBlock(block);
final int endRowNumber = getEndRowNumberForBlock(block);
DBCellRecord cellRecord = new DBCellRecord();
//Note: Cell references start from the second row...
int cellRefOffset = (rowBlockSize-20);
for (int row=startRowNumber;row<=endRowNumber;row++) {
if (cells.rowHasCells(row)) {
final int rowCellSize = cells.serializeCellRow(row, pos, data);
pos += rowCellSize;
//Add the offset to the first cell for the row into the DBCellRecord.
cellRecord.addCellOffset((short)cellRefOffset);
cellRefOffset = rowCellSize;
}
}
//Calculate Offset from the start of a DBCellRecord to the first Row
cellRecord.setRowOffset(pos - rowStartPos);
pos += cellRecord.serialize(pos, data);
}
return pos - offset;
}

93
src/java/org/apache/poi/hssf/record/aggregates/ValueRecordsAggregate.java
View File

@ -115,22 +115,7 @@ public class ValueRecordsAggregate
public int serialize(int offset, byte [] data)
{
//throw new RuntimeException("Not Implemented serialize");
int pos = offset;
Iterator irecs = getIterator();
while (irecs.hasNext()) {
pos += (( Record ) irecs.next()).serialize(pos,data);
}
/* Iterator itr = records.values().iterator();
int pos = offset;
while (itr.hasNext())
{
pos += (( Record ) itr.next()).serialize(pos, data);
}*/
return pos - offset;
throw new RuntimeException("This method shouldnt be called. ValueRecordsAggregate.serializeCellRow() should be called from RowRecordsAggregate.");
}
public ValueRecordsAggregate() {
@ -147,6 +132,42 @@ public class ValueRecordsAggregate
return new VRAIterator(this);
}
/** Tallies a count of the size of the cell records
* that are attached to the rows in the range specified.
*/
public int getRowCellBlockSize(int startRow, int endRow) {
Iterator cellRec = new VRAIterator(this, startRow, endRow);;
int size = 0;
while (cellRec.hasNext()) {
CellValueRecordInterface cell = (CellValueRecordInterface)cellRec.next();
int row = cell.getRow();
if ((row >=startRow) && (row <= endRow))
size += ((Record)cell).getRecordSize();
}
return size;
}
/** Returns true if the row has cells attached to it */
public boolean rowHasCells(int row) {
IntList ctRow = (IntList) celltype.get(row);
return ((ctRow != null) && (ctRow.size() > 0));
}
/** Serializes the cells that are allocated to a certain row range*/
public int serializeCellRow(final int row, int offset, byte [] data)
{
Iterator itr = new VRAIterator(this, row);
int pos = offset;
while (itr.hasNext())
{
CellValueRecordInterface cell = (CellValueRecordInterface)itr.next();
pos += (( Record ) cell).serialize(pos, data);
}
return pos - offset;
}
public int construct(int offset, List records)
{
@ -512,30 +533,33 @@ public class ValueRecordsAggregate
class VRAIterator implements Iterator {
private boolean hasNext;
private ValueRecordsAggregate vra;
int popindex;
int row;
int rowlimit;
int col;
private int popindex;
private int row;
private int rowlimit;
private int col;
CellValueRecordInterface current = null;
CellValueRecordInterface next = null;
public VRAIterator(ValueRecordsAggregate vra) {
this.vra = vra;
this.rowlimit = -1;
popindex = 0;
if (vra.getPhysicalNumberOfCells() > 0) {
hasNext = true;
next = findNextCell(null);
}
this(vra, 0, -1);
}
public VRAIterator(ValueRecordsAggregate vra, int row) {
this(vra);
rowlimit = row;
this.row = row;
this.popindex = vra.populatedRows.indexOf(row);
this(vra, row, row);
}
public VRAIterator(ValueRecordsAggregate vra, int startRow, int endRow) {
this.vra = vra;
this.row = startRow;
this.rowlimit = endRow;
this.popindex = vra.populatedRows.indexOf(row);
if (vra.getPhysicalNumberOfCells() > 0) {
next = findNextCell(null);
hasNext = (next != null);
}
}
public boolean hasNext() {
return hasNext;
}
@ -575,7 +599,7 @@ class VRAIterator implements Iterator {
rowNum = vra.populatedRows.get(popindex);
ctRow = (IntList)vra.celltype.get(rowNum);
if (ctRow.size() == 0) {
if (rowlimit == -1) {
if ((rowlimit == -1)||(rowNum<=rowlimit)) {
popindex++;
} else {
this.hasNext = false;
@ -592,8 +616,11 @@ class VRAIterator implements Iterator {
colNum = newCol;
if (colNum == -1) { //end of row, forward one row
popindex++;
if (popindex < vra.populatedRows.size() && rowlimit == -1) {
if (popindex < vra.populatedRows.size() && ((rowlimit == -1)||(rowNum<=rowlimit))) {
rowNum = vra.populatedRows.get(popindex);
//Return null if the row is out of range
if ((rowlimit != -1) &&( rowNum > rowlimit))
return null;
} else {
return null;
}