/**
* Method declaration
*
*
* @param d
*
* @return
*
* @throws Exception
*/
private Node search(object[] d)
{
Node x = root;
while (x != null)
{
if (Trace.STOP)
{
Trace.stop();
}
int c = compareRow(d, x.getData());
if (c == 0)
{
return(x);
}
else if (c < 0)
{
x = x.getLeft();
}
else
{
x = x.getRight();
}
}
return(null);
}
/**
* Method declaration
*
*
* @param x
*
* @return
*
* @throws Exception
*/
public Node next(Node x)
{
if ((++iNeedCleanUp & 127) == 0)
{
x.rData.cleanUpCache();
}
Node r = x.getRight();
if (r != null)
{
x = r;
Node l = x.getLeft();
while (l != null)
{
if (Trace.STOP)
{
Trace.stop();
}
x = l;
l = x.getLeft();
}
return(x);
}
Node ch = x;
x = x.getParent();
while (x != null && ch.Equals(x.getRight()))
{
if (Trace.STOP)
{
Trace.stop();
}
ch = x;
x = x.getParent();
}
return(x);
}
/**
* Method declaration
*
*
* @return
*
* @throws Exception
*/
public Node first()
{
Node x = root, l = x;
while (l != null)
{
if (Trace.STOP)
{
Trace.stop();
}
x = l;
l = x.getLeft();
}
return(x);
}
/**
* Method declaration
*
*
* @param data
*
* @return
*
* @throws Exception
*/
public Node find(object[] data)
{
Node x = root, n;
while (x != null)
{
if (Trace.STOP)
{
Trace.stop();
}
int i = compareRowNonUnique(data, x.getData());
if (i == 0)
{
return(x);
}
else if (i > 0)
{
n = x.getRight();
}
else
{
n = x.getLeft();
}
if (n == null)
{
return(null);
}
x = n;
}
return(null);
}
/**
* Method declaration
*
*
* @param x
* @param w
*
* @return
*
* @throws Exception
*/
private Node child(Node x, bool w)
{
return(w ? x.getLeft() : x.getRight());
}
/**
* Method declaration
*
*
* @param value
* @param compare
*
* @return
*
* @throws Exception
*/
public Node findFirst(object value, int compare)
{
Trace.assert(compare == Expression.BIGGER ||
compare == Expression.EQUAL ||
compare == Expression.BIGGER_EQUAL,
"Index.findFirst");
Node x = root;
int iTest = 1;
if (compare == Expression.BIGGER)
{
iTest = 0;
}
while (x != null)
{
if (Trace.STOP)
{
Trace.stop();
}
bool t = compareValue(value, x.getData()[iColumn_0]) >= iTest;
if (t)
{
Node r = x.getRight();
if (r == null)
{
break;
}
x = r;
}
else
{
Node l = x.getLeft();
if (l == null)
{
break;
}
x = l;
}
}
while (x != null &&
compareValue(value, x.getData()[iColumn_0]) >= iTest)
{
if (Trace.STOP)
{
Trace.stop();
}
x = next(x);
}
return(x);
}
/**
* Method declaration
*
*
* @param row
* @param datatoo
*
* @throws Exception
*/
public void delete(object[] row, bool datatoo)
{
Node x = search(row);
if (x == null)
{
return;
}
Node n;
if (x.getLeft() == null)
{
n = x.getRight();
}
else if (x.getRight() == null)
{
n = x.getLeft();
}
else
{
Node d = x;
x = x.getLeft();
// todo: this can be improved
while (x.getRight() != null)
{
if (Trace.STOP)
{
Trace.stop();
}
x = x.getRight();
}
// x will be replaced with n later
n = x.getLeft();
// swap d and x
int b = x.getBalance();
x.setBalance(d.getBalance());
d.setBalance(b);
// set x.parent
Node xp = x.getParent();
Node dp = d.getParent();
if (d == root)
{
root = x;
}
x.setParent(dp);
if (dp != null)
{
if (dp.getRight().Equals(d))
{
dp.setRight(x);
}
else
{
dp.setLeft(x);
}
}
// for in-memory tables we could use: d.rData=x.rData;
// but not for cached tables
// relink d.parent, x.left, x.right
if (xp == d)
{
d.setParent(x);
if (d.getLeft().Equals(x))
{
x.setLeft(d);
x.setRight(d.getRight());
}
else
{
x.setRight(d);
x.setLeft(d.getLeft());
}
}
else
{
d.setParent(xp);
xp.setRight(d);
x.setRight(d.getRight());
x.setLeft(d.getLeft());
}
x.getRight().setParent(x);
x.getLeft().setParent(x);
// set d.left, d.right
d.setLeft(n);
if (n != null)
{
n.setParent(d);
}
d.setRight(null);
x = d;
}
bool way = from(x);
replace(x, n);
n = x.getParent();
x.delete();
if (datatoo)
{
x.rData.delete();
}
while (n != null)
{
if (Trace.STOP)
{
Trace.stop();
}
x = n;
int sign = way ? 1 : -1;
switch (x.getBalance() * sign)
{
case -1:
x.setBalance(0);
break;
case 0:
x.setBalance(sign);
return;
case 1:
Node r = child(x, !way);
int b = r.getBalance();
if (b * sign >= 0)
{
replace(x, r);
set(x, !way, child(r, way));
set(r, way, x);
if (b == 0)
{
x.setBalance(sign);
r.setBalance(-sign);
return;
}
x.setBalance(0);
r.setBalance(0);
x = r;
}
else
{
Node l = child(r, way);
replace(x, l);
b = l.getBalance();
set(r, way, child(l, !way));
set(l, !way, r);
set(x, !way, child(l, way));
set(l, way, x);
x.setBalance((b == sign) ? -sign : 0);
r.setBalance((b == -sign) ? sign : 0);
l.setBalance(0);
x = l;
}
}
way = from(x);
n = x.getParent();
}
}
/**
* Method declaration
*
*
* @param x
* @param w
*
* @return
*
* @throws Exception
*/
private Node child(Node x, bool w)
{
return w ? x.getLeft() : x.getRight();
}
/**
* Method declaration
*
*
* @param x
*
* @return
*
* @throws Exception
*/
public Node next(Node x)
{
if ((++iNeedCleanUp & 127) == 0)
{
x.rData.cleanUpCache();
}
Node r = x.getRight();
if (r != null)
{
x = r;
Node l = x.getLeft();
while (l != null)
{
if (Trace.STOP)
{
Trace.stop();
}
x = l;
l = x.getLeft();
}
return x;
}
Node ch = x;
x = x.getParent();
while (x != null && ch.Equals(x.getRight()))
{
if (Trace.STOP)
{
Trace.stop();
}
ch = x;
x = x.getParent();
}
return x;
}