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//
// MSparseMatrix.m
// MySQLGUICommon
//
// Created by Alfredo Kojima on 3/24/05.
// Copyright 2005 MySQL AB. All rights reserved.
//
#import "MSparseMatrix.h"
@implementation MSparseMatrix
static unsigned long findRow(MSparseMatrixRow *rows, unsigned long count, unsigned long row,
BOOL approx)
{
unsigned long l, r, m;
if (count == 0 || rows[count-1].row < row)
return approx ? count : (unsigned long)-1;
l= 0;
r= count-1;
while (l <= r && r != (unsigned long)-1)
{
m= (r+l)/2;
if (rows[m].row < row)
l= m+1;
else if (rows[m].row > row)
r= m-1;
else
return m;
}
if (approx)
return m;
else
return (unsigned long)-1;
}
- (id)init
{
self= [super init];
if (self)
{
_zone= NSDefaultMallocZone();
_rowSize= 8;
_rows= NSZoneMalloc(_zone, _rowSize*sizeof(MSparseMatrixRow));
}
return self;
}
- (void)dealloc
{
[self removeAllObjects];
if (_rows)
NSZoneFree(_zone, _rows);
[super dealloc];
}
- (id)objectAtRow:(unsigned long)row
column:(unsigned long)column
{
unsigned long index= findRow(_rows, _rowCount, row, NO);
MSparseMatrixRow *srow= index == (unsigned long)-1?NULL:_rows+index;
if (srow)
{
MSparseMatrixColumn *scolumn= srow->column;
while (scolumn && scolumn->column < column)
scolumn= scolumn->next;
if (scolumn && scolumn->column == column)
return scolumn->data;
}
return nil;
}
- (void)setObject:(id)obj
atRow:(unsigned long)row
column:(unsigned long)column
{
unsigned long index= findRow(_rows, _rowCount, row, YES);
MSparseMatrixRow *srow;
if (index == (unsigned long)-1 || index >= _rowCount || _rows[index].row != row)
{
if (_rowCount+1 == _rowSize)
{
_rowSize+= 8;
_rows= NSZoneRealloc(_zone, _rows, _rowSize*sizeof(MSparseMatrixRow));
}
memmove(_rows+index+1, _rows+index, (_rowCount-index)*sizeof(MSparseMatrixRow));
_rows[index].row= row;
_rows[index].column= NULL;
_rowCount++;
srow= _rows+index;
}
else
srow= _rows+index;
if (!srow->column)
{
srow->column= NSZoneMalloc(_zone, sizeof(MSparseMatrixColumn));
srow->column->column= column;
srow->column->data= [obj retain];
srow->column->next= NULL;
}
else
{
MSparseMatrixColumn *scolumn= srow->column;
if (scolumn->column > column)
{
MSparseMatrixColumn *ncolumn;
ncolumn= NSZoneMalloc(_zone, sizeof(MSparseMatrixColumn));
ncolumn->column= column;
ncolumn->data= [obj retain];
ncolumn->next= scolumn;
srow->column= ncolumn;
}
else
{
MSparseMatrixColumn *prev= NULL;
while (scolumn && scolumn->column < column)
{
prev= scolumn;
scolumn= scolumn->next;
}
if (scolumn && scolumn->column == column)
{
[scolumn->data release];
scolumn->data= [obj retain];
}
else
{
MSparseMatrixColumn *ncolumn;
ncolumn= NSZoneMalloc(_zone, sizeof(MSparseMatrixColumn));
ncolumn->column= column;
ncolumn->data= [obj retain];
ncolumn->next= scolumn;
prev->next= ncolumn;
}
}
}
}
- (void)removeAllObjects
{
unsigned long r;
for (r= 0; r < _rowCount; r++)
{
while (_rows[r].column)
{
MSparseMatrixColumn *next= _rows[r].column->next;
[_rows[r].column->data release];
NSZoneFree(_zone, _rows[r].column);
_rows[r].column= next;
}
}
_rowCount= 0;
}
- (MSparseMatrixRow*)firstRow
{
if (_rowCount == 0)
return NULL;
else
return _rows;
}
- (MSparseMatrixRow*)nextRowAfter:(MSparseMatrixRow*)row
{
if (row < _rows+_rowCount-1)
return row+1;
else
return NULL;
}
- (MSparseMatrixColumn*)firstColumnInRow:(MSparseMatrixRow*)row
{
return row->column;
}
- (MSparseMatrixColumn*)nextColumnInRow:(MSparseMatrixRow*)row
after:(MSparseMatrixColumn*)column
{
return column->next;
}
@end
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