internal static int allocate(DatabaseImpl db, int root, ClassDescriptor.FieldType type, OldBtreeKey ins)
{
int pageId = db.allocatePage();
Page pg = db.putPage(pageId);
setnItems(pg, 1);
if (type == ClassDescriptor.FieldType.tpString)
{
char[] sval = (char[])ins.key.oval;
int len = sval.Length;
setSize(pg, len * 2);
setKeyStrOffs(pg, 0, keySpace - len * 2);
setKeyStrSize(pg, 0, len);
setKeyStrOid(pg, 0, ins.oid);
setKeyStrOid(pg, 1, root);
setKeyStrChars(pg, keySpace - len * 2, sval);
}
else if (type == ClassDescriptor.FieldType.tpArrayOfByte)
{
byte[] bval = (byte[])ins.key.oval;
int len = bval.Length;
setSize(pg, len);
setKeyStrOffs(pg, 0, keySpace - len);
setKeyStrSize(pg, 0, len);
setKeyStrOid(pg, 0, ins.oid);
setKeyStrOid(pg, 1, root);
setKeyBytes(pg, keySpace - len, bval);
}
else
{
ins.pack(pg, 0);
setReference(pg, maxItems - 2, root);
}
db.pool.unfix(pg);
return pageId;
}
internal static OldBtreeResult insert(DatabaseImpl db, int pageId, OldBtree tree, OldBtreeKey ins, int height, bool unique, bool overwrite)
{
Page pg = db.getPage(pageId);
OldBtreeResult result;
int l = 0, n = getnItems(pg), r = n;
try
{
if (tree.FieldType == ClassDescriptor.FieldType.tpString)
{
while (l < r)
{
int i = (l + r) >> 1;
if (compareStr(ins.key, pg, i) > 0)
l = i + 1;
else
r = i;
}
Debug.Assert(l == r);
if (--height != 0)
{
result = insert(db, getKeyStrOid(pg, r), tree, ins, height, unique, overwrite);
Debug.Assert(result != OldBtreeResult.NotFound);
if (result != OldBtreeResult.Overflow)
{
return result;
}
}
else if (r < n && compareStr(ins.key, pg, r) == 0)
{
if (overwrite)
{
db.pool.unfix(pg);
pg = null;
pg = db.putPage(pageId);
setKeyStrOid(pg, r, ins.oid);
return OldBtreeResult.Overwrite;
}
else if (unique)
{
return OldBtreeResult.Duplicate;
}
}
db.pool.unfix(pg);
pg = null;
pg = db.putPage(pageId);
return insertStrKey(db, pg, r, ins, height);
}
else if (tree.FieldType == ClassDescriptor.FieldType.tpArrayOfByte)
{
while (l < r)
{
int i = (l + r) >> 1;
if (tree.compareByteArrays(ins.key, pg, i) > 0)
l = i + 1;
else
r = i;
}
Debug.Assert(l == r);
if (--height != 0)
{
result = insert(db, getKeyStrOid(pg, r), tree, ins, height, unique, overwrite);
Debug.Assert(result != OldBtreeResult.NotFound);
if (result != OldBtreeResult.Overflow)
{
return result;
}
}
else if (r < n && tree.compareByteArrays(ins.key, pg, r) == 0)
{
if (overwrite)
{
db.pool.unfix(pg);
pg = null;
pg = db.putPage(pageId);
setKeyStrOid(pg, r, ins.oid);
return OldBtreeResult.Overwrite;
}
else if (unique)
{
return OldBtreeResult.Duplicate;
}
}
db.pool.unfix(pg);
pg = null;
pg = db.putPage(pageId);
return insertByteArrayKey(db, pg, r, ins, height);
}
else
{
while (l < r)
{
int i = (l + r) >> 1;
if (compare(ins.key, pg, i) > 0)
l = i + 1;
else
r = i;
}
Debug.Assert(l == r);
/* insert before e[r] */
if (--height != 0)
{
result = insert(db, getReference(pg, maxItems - r - 1), tree, ins, height, unique, overwrite);
Debug.Assert(result != OldBtreeResult.NotFound);
if (result != OldBtreeResult.Overflow)
return result;
n += 1;
}
else if (r < n && compare(ins.key, pg, r) == 0)
{
if (overwrite)
{
db.pool.unfix(pg);
pg = null;
pg = db.putPage(pageId);
setReference(pg, maxItems - r - 1, ins.oid);
return OldBtreeResult.Overwrite;
}
else if (unique)
{
return OldBtreeResult.Duplicate;
}
}
db.pool.unfix(pg);
pg = null;
pg = db.putPage(pageId);
int itemSize = ClassDescriptor.Sizeof[(int)tree.FieldType];
int max = keySpace / (4 + itemSize);
if (n < max)
{
memcpy(pg, r + 1, pg, r, n - r, itemSize);
memcpy(pg, maxItems - n - 1, pg, maxItems - n, n - r, 4);
ins.pack(pg, r);
setnItems(pg, getnItems(pg) + 1);
return OldBtreeResult.Done;
}
else
{
/* page is full then divide page */
pageId = db.allocatePage();
Page b = db.putPage(pageId);
Debug.Assert(n == max);
int m = max / 2;
if (r < m)
{
memcpy(b, 0, pg, 0, r, itemSize);
memcpy(b, r + 1, pg, r, m - r - 1, itemSize);
memcpy(pg, 0, pg, m - 1, max - m + 1, itemSize);
memcpy(b, maxItems - r, pg, maxItems - r, r, 4);
ins.pack(b, r);
memcpy(b, maxItems - m, pg, maxItems - m + 1, m - r - 1, 4);
memcpy(pg, maxItems - max + m - 1, pg, maxItems - max, max - m + 1, 4);
}
else
{
memcpy(b, 0, pg, 0, m, itemSize);
memcpy(pg, 0, pg, m, r - m, itemSize);
memcpy(pg, r - m + 1, pg, r, max - r, itemSize);
memcpy(b, maxItems - m, pg, maxItems - m, m, 4);
memcpy(pg, maxItems - r + m, pg, maxItems - r, r - m, 4);
ins.pack(pg, r - m);
memcpy(pg, maxItems - max + m - 1, pg, maxItems - max, max - r, 4);
}
ins.oid = pageId;
ins.extract(b, firstKeyOffs + (m - 1) * itemSize, tree.FieldType);
if (height == 0)
{
setnItems(pg, max - m + 1);
setnItems(b, m);
}
else
{
setnItems(pg, max - m);
setnItems(b, m - 1);
}
db.pool.unfix(b);
return OldBtreeResult.Overflow;
}
}
}
finally
{
if (pg != null)
db.pool.unfix(pg);
}
}