private static MGRB DoBitOperation(MGRB bits, MGRB c, OPERATION op, int maxsize)
{
if (bits != null)
{
switch (op)
{
case OPERATION.AND:
bits = bits.And(c);
break;
case OPERATION.OR:
bits = bits.Or(c);
break;
case OPERATION.ANDNOT:
bits = bits.And(c.Not(maxsize));
break;
}
}
else
{
bits = c;
}
return(bits);
}
private MGRB doLessOp(RDBExpression exp, T key)
{
bool found = false;
int pos = FindPageOrLowerPosition(key, ref found);
MGRB result = new MGRB();
if (pos > 0)
{
// all the pages before
for (int i = 0; i < pos - 1; i++)
{
doPageOperation(ref result, i);
}
}
// key page
Page <T> page = LoadPage(_pageList.GetValue(pos).PageNumber);
T[] keys = page.tree.Keys();
Array.Sort(keys);
// find better end position rather than last key
pos = Array.BinarySearch <T>(keys, key);
if (pos < 0)
{
pos = ~pos;
}
for (int i = 0; i < pos; i++)
{
T k = keys[i];
if (k.CompareTo(key) > 0)
{
break;
}
int bn = page.tree[k].DuplicateBitmapNumber;
if (k.CompareTo(key) < 0)
{
result = result.Or(_index.GetDuplicateBitmap(bn));
}
if (exp == RDBExpression.LessEqual && k.CompareTo(key) == 0)
{
result = result.Or(_index.GetDuplicateBitmap(bn));
}
}
return(result);
}
private void doPageOperation(ref MGRB res, int pageidx)
{
Page <T> page = LoadPage(_pageList.GetValue(pageidx).PageNumber);
T[] keys = page.tree.Keys(); // avoid sync issues
foreach (var k in keys)
{
int bn = page.tree[k].DuplicateBitmapNumber;
res = res.Or(_index.GetDuplicateBitmap(bn));
}
}
private MGRB ExecutionPlan(string filter, int maxsize)
{
//_log.Debug("query : " + filter);
DateTime dt = FastDateTime.Now;
// query indexes
string[] words = filter.Split(' ');
//bool defaulttoand = true;
//if (filter.IndexOfAny(new char[] { '+', '-' }, 0) > 0)
// defaulttoand = false;
MGRB found = null;// MGRB.Fill(maxsize);
foreach (string s in words)
{
int c;
bool not = false;
string word = s;
if (s == "")
{
continue;
}
OPERATION op = OPERATION.AND;
//if (defaulttoand)
// op = OPERATION.AND;
if (word.StartsWith("+"))
{
op = OPERATION.OR;
word = s.Replace("+", "");
}
if (word.StartsWith("-"))
{
op = OPERATION.ANDNOT;
word = s.Replace("-", "");
not = true;
if (found == null) // leading with - -> "-oak hill"
{
found = MGRB.Fill(maxsize);
}
}
if (word.Contains("*") || word.Contains("?"))
{
MGRB wildbits = new MGRB();
// do wildcard search
Regex reg = new Regex("^" + word.Replace("*", ".*").Replace("?", ".") + "$", RegexOptions.IgnoreCase);
foreach (string key in _words.Keys())
{
if (reg.IsMatch(key))
{
_words.TryGetValue(key, out c);
MGRB ba = _bitmaps.GetBitmap(c);
wildbits = DoBitOperation(wildbits, ba, OPERATION.OR, maxsize);
}
}
if (found == null)
{
found = wildbits;
}
else
{
if (not) // "-oak -*l"
{
found = found.AndNot(wildbits);
}
else if (op == OPERATION.AND)
{
found = found.And(wildbits);
}
else
{
found = found.Or(wildbits);
}
}
}
else if (_words.TryGetValue(word.ToLowerInvariant(), out c))
{
// bits logic
MGRB ba = _bitmaps.GetBitmap(c);
found = DoBitOperation(found, ba, op, maxsize);
}
else if (op == OPERATION.AND)
{
found = new MGRB();
}
}
if (found == null)
{
return(new MGRB());
}
// remove deleted docs
MGRB ret;
if (_docMode)
{
ret = found.AndNot(_deleted.GetBits());
}
else
{
ret = found;
}
//_log.Debug("query time (ms) = " + FastDateTime.Now.Subtract(dt).TotalMilliseconds);
return(ret);
}
public MGRB Query(T from, T to, int maxsize)
{
MGRB bits = new MGRB();
T temp = default(T);
if (from.CompareTo(to) > 0) // check values order
{
temp = from;
from = to;
to = temp;
}
// find first page and do > than
bool found = false;
int startpos = FindPageOrLowerPosition(from, ref found);
// find last page and do < than
int endpos = FindPageOrLowerPosition(to, ref found);
bool samepage = startpos == endpos;
// from key page
Page <T> page = LoadPage(_pageList.GetValue(startpos).PageNumber);
T[] keys = page.tree.Keys();
Array.Sort(keys);
// find better start position rather than 0
int pos = Array.BinarySearch <T>(keys, from); // FEATURE : rewrite??
if (pos < 0)
{
pos = ~pos;
}
for (int i = pos; i < keys.Length; i++)
{
T k = keys[i];
int bn = page.tree[k].DuplicateBitmapNumber;
if (samepage)
{
if (k.CompareTo(from) >= 0 && k.CompareTo(to) <= 0) // if from,to same page
{
bits = bits.Or(_index.GetDuplicateBitmap(bn));
}
}
else
{
if (k.CompareTo(from) >= 0)
{
bits = bits.Or(_index.GetDuplicateBitmap(bn));
}
}
}
if (!samepage)
{
// to key page
page = LoadPage(_pageList.GetValue(endpos).PageNumber);
keys = page.tree.Keys();
Array.Sort(keys);
// find better end position rather than last key
pos = Array.BinarySearch <T>(keys, to);
if (pos < 0)
{
pos = ~pos;
}
for (int i = 0; i <= pos; i++)
{
T k = keys[i];
int bn = page.tree[k].DuplicateBitmapNumber;
if (k.CompareTo(to) <= 0)
{
bits = bits.Or(_index.GetDuplicateBitmap(bn));
}
}
// do all pages in between
for (int i = startpos + 1; i < endpos; i++)
{
doPageOperation(ref bits, i);
}
}
return(bits);
}
public void InPlaceOR(MGRB left)
{
lock (_lock)
_bits = _bits.Or(left);
}
