private bool CompareSortIndexDesc(int[] id)
{
if (id.Length < indexDesc.Length)
{
return(false);
}
int j = 0;
int lenId = id.Length;
int lenIndexDesc = indexDesc.Length;
for (int i = 0; i < lenId && j < lenIndexDesc; i++)
{
if (id[i] == indexDesc[j])
{
j++;
}
else
{
ColumnInfo canColumn = candidateColumns[DataKey.ColumnOrder(id[i])];
if (!(canColumn != null && canColumn.equalsOperator))
{
return(false);
}
}
}
return(j == lenIndexDesc);
}
private int CompareRecords(int record1, int record2)
{
int lenIndexDesc = indexDesc.Length;
for (int i = 0; i < lenIndexDesc; i++)
{
Int32 d = indexDesc[i];
int c = table.Columns[DataKey.ColumnOrder(d)].Compare(record1, record2);
if (c != 0)
{
if (DataKey.SortDecending(d))
{
c = -c;
}
return(c);
}
}
int id1 = table.recordManager[record1] == null? 0: table.recordManager[record1].rowID;
int id2 = table.recordManager[record2] == null? 0: table.recordManager[record2].rowID;
int diff = id1 - id2;
// if they're two records in the same row, we need to be able to distinguish them.
if (diff == 0 && record1 != record2 &&
table.recordManager[record1] != null && table.recordManager[record2] != null)
{
id1 = (int)table.recordManager[record1].GetRecordState(record1);
id2 = (int)table.recordManager[record2].GetRecordState(record2);
diff = id1 - id2;
}
return(diff);
}
private int Evaluate(int record)
{
DataRow row = this.table.recordManager[record];
if (row != null)
{
DataRowVersion original = DataRowVersion.Default;
if (row.oldRecord == record)
{
original = DataRowVersion.Original;
}
else if (row.newRecord == record)
{
original = DataRowVersion.Current;
}
else if (row.tempRecord == record)
{
original = DataRowVersion.Proposed;
}
int[] indexDesc = this.index.IndexDesc;
for (int i = 0; i < this.matchedCandidates; i++)
{
int num2 = this.Eval(this.candidateColumns[DataKey.ColumnOrder(indexDesc[i])].expr, row, original);
if (num2 != 0)
{
if (!DataKey.SortDecending(indexDesc[i]))
{
return(num2);
}
return(-num2);
}
}
}
return(0);
}
private bool CompareSortIndexDesc(int[] id)
{
if (id.Length < this.indexDesc.Length)
{
return(false);
}
int index = 0;
for (int i = 0; (i < id.Length) && (index < this.indexDesc.Length); i++)
{
if (id[i] == this.indexDesc[index])
{
index++;
}
else
{
ColumnInfo info = this.candidateColumns[DataKey.ColumnOrder(id[i])];
if ((info == null) || !info.equalsOperator)
{
return(false);
}
}
}
return(index == this.indexDesc.Length);
}
private int CompareRecords(int record1, int record2)
{
int length = this.indexDesc.Length;
for (int i = 0; i < length; i++)
{
int indexDesc = this.indexDesc[i];
int num3 = this.table.Columns[DataKey.ColumnOrder(indexDesc)].Compare(record1, record2);
if (num3 != 0)
{
if (DataKey.SortDecending(indexDesc))
{
num3 = -num3;
}
return(num3);
}
}
long recordState = (this.table.recordManager[record1] == null) ? 0L : this.table.recordManager[record1].rowID;
long num = (this.table.recordManager[record2] == null) ? 0L : this.table.recordManager[record2].rowID;
int num5 = (recordState < num) ? -1 : ((num < recordState) ? 1 : 0);
if (((num5 == 0) && (record1 != record2)) && ((this.table.recordManager[record1] != null) && (this.table.recordManager[record2] != null)))
{
recordState = (long)this.table.recordManager[record1].GetRecordState(record1);
num = (long)this.table.recordManager[record2].GetRecordState(record2);
num5 = (recordState < num) ? -1 : ((num < recordState) ? 1 : 0);
}
return(num5);
}
private void BuildLinearExpression()
{
int num;
int[] indexDesc = this.index.IndexDesc;
for (num = 0; num < this.matchedCandidates; num++)
{
ColumnInfo info = this.candidateColumns[DataKey.ColumnOrder(indexDesc[num])];
info.flag = true;
}
int length = this.candidateColumns.Length;
for (num = 0; num < length; num++)
{
if (this.candidateColumns[num] != null)
{
if (!this.candidateColumns[num].flag)
{
if (this.candidateColumns[num].expr != null)
{
this.linearExpression = (this.linearExpression == null) ? this.candidateColumns[num].expr : new BinaryNode(this.table, 0x1a, this.candidateColumns[num].expr, this.linearExpression);
}
}
else
{
this.candidateColumns[num].flag = false;
}
}
}
}
public bool EqualKeys(int record1, int record2)
{
for (int i = 0; i < indexDesc.Length; i++)
{
int col = DataKey.ColumnOrder(indexDesc[i]);
if (table.Columns[col].Compare(record1, record2) != 0)
{
return(false);
}
}
return(true);
}
private int CompareRecordToKey(int record1, object val)
{
Debug.Assert(indexDesc.Length == 1, "Invalid ussage: CompareRecordToKey");
Int32 d = indexDesc[0];
int c = table.Columns[DataKey.ColumnOrder(d)].CompareToValue(record1, val);
if (c != 0)
{
if (DataKey.SortDecending(d))
{
c = -c;
}
return(c);
}
return(0);
}
private int CompareRecordToKey(int record1, object[] vals)
{
for (int i = 0; i < indexDesc.Length; i++)
{
Int32 d = indexDesc[i];
int c = table.Columns[DataKey.ColumnOrder(d)].CompareToValue(record1, vals[i]);
if (c != 0)
{
if (DataKey.SortDecending(d))
{
c = -c;
}
return(c);
}
}
return(0);
}
// Returns no. of columns that are matched
private int CompareClosestCandidateIndexDesc(int[] id)
{
int count = (id.Length < nCandidates ? id.Length : nCandidates);
int i = 0;
for (; i < count; i++)
{
ColumnInfo canColumn = candidateColumns[DataKey.ColumnOrder(id[i])];
if (canColumn == null || canColumn.expr == null)
{
break;
}
else
if (!canColumn.equalsOperator)
{
return(i + 1);
}
}
return(i);
}
private int CompareClosestCandidateIndexDesc(int[] id)
{
int num2 = (id.Length < this.nCandidates) ? id.Length : this.nCandidates;
int index = 0;
while (index < num2)
{
ColumnInfo info = this.candidateColumns[DataKey.ColumnOrder(id[index])];
if ((info == null) || (info.expr == null))
{
return(index);
}
if (!info.equalsOperator)
{
return(index + 1);
}
index++;
}
return(index);
}
private int Evaluate(int record)
{
DataRow row = table.recordManager[record];
if (row == null)
{
return(0);
}
// UNDONE: perf switch to (row, version) internaly
DataRowVersion version = DataRowVersion.Default;
if (row.oldRecord == record)
{
version = DataRowVersion.Original;
}
else if (row.newRecord == record)
{
version = DataRowVersion.Current;
}
else if (row.tempRecord == record)
{
version = DataRowVersion.Proposed;
}
int[] id = index.IndexDesc;
for (int i = 0; i < matchedCandidates; i++)
{
Debug.Assert(candidateColumns[DataKey.ColumnOrder(id[i])] != null, "How come this is not a candidate column");
Debug.Assert(candidateColumns[DataKey.ColumnOrder(id[i])].expr != null, "How come there is no associated expression");
int c = Eval(candidateColumns[DataKey.ColumnOrder(id[i])].expr, row, version);
if (c != 0)
{
return(DataKey.SortDecending(id[i]) ? -c : c);
}
}
return(0);
}
// Based on the current index and candidate columns settings, build the linear expression; Should be called only when there is atleast something for Binary Searching
private void BuildLinearExpression()
{
int i;
int[] id = index.IndexDesc;
int lenId = id.Length;
Debug.Assert(matchedCandidates > 0 && matchedCandidates <= lenId, "BuildLinearExpression : Invalid Index");
for (i = 0; i < matchedCandidates; i++)
{
ColumnInfo canColumn = candidateColumns[DataKey.ColumnOrder(id[i])];
Debug.Assert(canColumn != null && canColumn.expr != null, "BuildLinearExpression : Must be a matched candidate");
canColumn.flag = true;
}
Debug.Assert(matchedCandidates == 1 || candidateColumns[matchedCandidates - 1].equalsOperator, "BuildLinearExpression : Invalid matched candidates");
int lenCanColumns = candidateColumns.Length;
for (i = 0; i < lenCanColumns; i++)
{
if (candidateColumns[i] != null)
{
if (!candidateColumns[i].flag)
{
if (candidateColumns[i].expr != null)
{
this.linearExpression = (this.linearExpression == null ? candidateColumns[i].expr : new BinaryNode(Operators.And, candidateColumns[i].expr, this.linearExpression));
}
}
else
{
candidateColumns[i].flag = false;
}
}
}
Debug.Assert(this.linearExpression != null, "BuildLinearExpression : How come there is nothing to search linearly");
}
// Based on the required sorting and candidate columns settings, create a new index; Should be called only when there is no existing index to be reused
private void CreateIndex()
{
if (index == null)
{
if (nCandidates == 0)
{
index = new Index(table, indexDesc, recordStates, null);
}
else
{
int i;
int lenCanColumns = candidateColumns.Length;
int lenIndexDesc = indexDesc.Length;
bool equalsOperator = true;
for (i = 0; i < lenCanColumns; i++)
{
if (candidateColumns[i] != null)
{
if (!candidateColumns[i].equalsOperator)
{
equalsOperator = false;
break;
}
}
}
for (i = 0; i < lenIndexDesc; i++)
{
if (candidateColumns[DataKey.ColumnOrder(indexDesc[i])] == null)
{
break;
}
}
int indexNotInCandidates = indexDesc.Length - i;
int candidatesNotInIndex = nCandidates - i;
int[] ndxDesc = new int[nCandidates + indexNotInCandidates];
if (equalsOperator)
{
for (i = 0; i < lenIndexDesc; i++)
{
ndxDesc[candidatesNotInIndex + i] = indexDesc[i];
ColumnInfo canColumn = candidateColumns[DataKey.ColumnOrder(indexDesc[i])];
if (canColumn != null)
{
canColumn.flag = true;
}
}
int j = 0;
for (i = 0; i < lenCanColumns; i++)
{
if (candidateColumns[i] != null)
{
if (!candidateColumns[i].flag)
{
ndxDesc[j++] = i;
}
else
{
candidateColumns[i].flag = false;
}
}
}
Debug.Assert(j == candidatesNotInIndex, "Whole ndxDesc should be filled!");
index = new Index(table, ndxDesc, recordStates, null);
matchedCandidates = nCandidates;
}
else
{
for (i = 0; i < lenIndexDesc; i++)
{
ndxDesc[i] = indexDesc[i];
ColumnInfo canColumn = candidateColumns[DataKey.ColumnOrder(indexDesc[i])];
if (canColumn != null)
{
canColumn.flag = true;
}
}
int j = i;
for (i = 0; i < lenCanColumns; i++)
{
if (candidateColumns[i] != null)
{
if (!candidateColumns[i].flag)
{
ndxDesc[j++] = i;
}
else
{
candidateColumns[i].flag = false;
}
}
}
Debug.Assert(j == nCandidates + indexNotInCandidates, "Whole ndxDesc should be filled!");
index = new Index(table, ndxDesc, recordStates, null);
matchedCandidates = 0;
if (this.linearExpression != this.expression)
{
int[] id = index.IndexDesc;
while (matchedCandidates < j) // haroona : j = index.IndexDesc.Length
{
ColumnInfo canColumn = candidateColumns[DataKey.ColumnOrder(id[matchedCandidates])];
if (canColumn == null || canColumn.expr == null)
{
break;
}
matchedCandidates++;
if (!canColumn.equalsOperator)
{
break;
}
}
}
}
}
}
}
private void CreateIndex()
{
if (this.index == null)
{
if (this.nCandidates == 0)
{
this.index = new Index(this.table, this.IndexFields, this.recordStates, null);
this.index.AddRef();
}
else
{
int num;
int length = this.candidateColumns.Length;
int num5 = this.indexDesc.Length;
bool flag = true;
for (num = 0; num < length; num++)
{
if ((this.candidateColumns[num] != null) && !this.candidateColumns[num].equalsOperator)
{
flag = false;
break;
}
}
int num2 = 0;
for (num = 0; num < num5; num++)
{
ColumnInfo info4 = this.candidateColumns[DataKey.ColumnOrder(this.indexDesc[num])];
if (info4 != null)
{
info4.flag = true;
num2++;
}
}
int num7 = num5 - num2;
int[] ndexDesc = new int[this.nCandidates + num7];
if (flag)
{
num2 = 0;
for (num = 0; num < length; num++)
{
if (this.candidateColumns[num] != null)
{
ndexDesc[num2++] = num;
this.candidateColumns[num].flag = false;
}
}
for (num = 0; num < num5; num++)
{
ColumnInfo info = this.candidateColumns[DataKey.ColumnOrder(this.indexDesc[num])];
if ((info == null) || info.flag)
{
ndexDesc[num2++] = this.indexDesc[num];
if (info != null)
{
info.flag = false;
}
}
}
for (num = 0; num < this.candidateColumns.Length; num++)
{
if (this.candidateColumns[num] != null)
{
this.candidateColumns[num].flag = false;
}
}
IndexField[] zeroIndexField = DataTable.zeroIndexField;
if (0 < ndexDesc.Length)
{
zeroIndexField = new IndexField[ndexDesc.Length];
for (int i = 0; i < ndexDesc.Length; i++)
{
DataColumn column2 = this.table.Columns[DataKey.ColumnOrder(ndexDesc[i])];
bool isDescending = DataKey.SortDecending(ndexDesc[i]);
zeroIndexField[i] = new IndexField(column2, isDescending);
}
}
this.index = new Index(this.table, ndexDesc, zeroIndexField, this.recordStates, null);
if (!this.IsOperatorIn(this.expression))
{
this.index.AddRef();
}
this.matchedCandidates = this.nCandidates;
}
else
{
num = 0;
while (num < num5)
{
ndexDesc[num] = this.indexDesc[num];
ColumnInfo info3 = this.candidateColumns[DataKey.ColumnOrder(this.indexDesc[num])];
if (info3 != null)
{
info3.flag = true;
}
num++;
}
num2 = num;
for (num = 0; num < length; num++)
{
if (this.candidateColumns[num] != null)
{
if (!this.candidateColumns[num].flag)
{
ndexDesc[num2++] = num;
}
else
{
this.candidateColumns[num].flag = false;
}
}
}
IndexField[] indexFields = DataTable.zeroIndexField;
if (0 < ndexDesc.Length)
{
indexFields = new IndexField[ndexDesc.Length];
for (int j = 0; j < ndexDesc.Length; j++)
{
DataColumn column = this.table.Columns[DataKey.ColumnOrder(ndexDesc[j])];
bool flag2 = DataKey.SortDecending(ndexDesc[j]);
indexFields[j] = new IndexField(column, flag2);
}
}
this.index = new Index(this.table, ndexDesc, indexFields, this.recordStates, null);
this.matchedCandidates = 0;
if (this.linearExpression != this.expression)
{
int[] indexDesc = this.index.IndexDesc;
while (this.matchedCandidates < num2)
{
ColumnInfo info2 = this.candidateColumns[DataKey.ColumnOrder(indexDesc[this.matchedCandidates])];
if ((info2 == null) || (info2.expr == null))
{
break;
}
this.matchedCandidates++;
if (!info2.equalsOperator)
{
break;
}
}
}
for (num = 0; num < this.candidateColumns.Length; num++)
{
if (this.candidateColumns[num] != null)
{
this.candidateColumns[num].flag = false;
}
}
}
}
}
}
