public override Expression Visit(Expression node)
{
if (node.NodeType == ExpressionType.NewArrayInit)
{
var a = node as NewArrayExpression;
_count = a.Expressions.Count;
return(base.Visit(node));
}
else if (node.NodeType == ExpressionType.MemberAccess)
{
var v = base.Visit(node);
if (_InCommand != "")
{
var a = _stack.Pop() as IList;
foreach (var c in a)
{
if (_inBmp == null)
{
_inBmp = qexpression(_InCommand, RDBExpression.Equal, c);
}
else
{
_inBmp = _inBmp.Or(qexpression(_InCommand, RDBExpression.Equal, c));
}
}
}
return(v);
}
else
{
return(base.Visit(node));
}
}
protected override Expression VisitBinary(BinaryExpression b)
{
_leftmode = true;
var m = this.Visit(b.Left);
if (m == null) // VB.net sty;e linq for string compare
{
return(b.Right);
}
ExpressionType t = b.NodeType;
if (t == ExpressionType.Equal || t == ExpressionType.NotEqual ||
t == ExpressionType.LessThan || t == ExpressionType.LessThanOrEqual ||
t == ExpressionType.GreaterThan || t == ExpressionType.GreaterThanOrEqual)
{
_stack.Push(b.NodeType);
}
_leftmode = false;
this.Visit(b.Right);
t = b.NodeType;
if (t == ExpressionType.Equal || t == ExpressionType.NotEqual ||
t == ExpressionType.LessThanOrEqual || t == ExpressionType.LessThan ||
t == ExpressionType.GreaterThanOrEqual || t == ExpressionType.GreaterThan
)
{
// binary expression
object lval = _stack.Pop();
ExpressionType lop = (ExpressionType)_stack.Pop();
string lname = (string)_stack.Pop();
if (_stack.Count > 0)
{
lname += "_" + (string)_stack.Pop();
}
RDBExpression exp = RDBExpression.Equal;
if (lop == ExpressionType.LessThan)
{
exp = RDBExpression.Less;
}
else if (lop == ExpressionType.LessThanOrEqual)
{
exp = RDBExpression.LessEqual;
}
else if (lop == ExpressionType.GreaterThan)
{
exp = RDBExpression.Greater;
}
else if (lop == ExpressionType.GreaterThanOrEqual)
{
exp = RDBExpression.GreaterEqual;
}
else if (lop == ExpressionType.NotEqual)
{
exp = RDBExpression.NotEqual;
}
_bitmap.Push(qexpression(lname, exp, lval));
}
if (t == ExpressionType.And || t == ExpressionType.AndAlso ||
t == ExpressionType.Or || t == ExpressionType.OrElse)
{
if (_bitmap.Count > 1)
{
// do bitmap operations
WAHBitArray right = (WAHBitArray)_bitmap.Pop();
WAHBitArray left = (WAHBitArray)_bitmap.Pop();
if (t == ExpressionType.And || t == ExpressionType.AndAlso)
{
_bitmap.Push(right.And(left));
}
if (t == ExpressionType.Or || t == ExpressionType.OrElse)
{
_bitmap.Push(right.Or(left));
}
}
else
{
// single bitmap operation
}
}
return(b);
}
protected override Expression VisitBinary(BinaryExpression b)
{
var m = this.Visit(b.Left);
if (m == null) // VB.net sty;e linq for string compare
{
return(b.Right);
}
ExpressionType t = b.NodeType;
if (t == ExpressionType.Equal || t == ExpressionType.NotEqual ||
t == ExpressionType.LessThan || t == ExpressionType.LessThanOrEqual ||
t == ExpressionType.GreaterThan || t == ExpressionType.GreaterThanOrEqual)
{
_stack.Push(b.NodeType);
}
this.Visit(b.Right);
t = b.NodeType;
if (t == ExpressionType.Equal || t == ExpressionType.NotEqual ||
t == ExpressionType.LessThanOrEqual || t == ExpressionType.LessThan ||
t == ExpressionType.GreaterThanOrEqual || t == ExpressionType.GreaterThan
)
{
// binary expression
object lv = _stack.Pop();
ExpressionType lo = (ExpressionType)_stack.Pop();
object ln = _stack.Pop();
RDBExpression exp = RDBExpression.Equal;
// FEATURE : add contains , between, startswith
if (lo == ExpressionType.LessThan)
{
exp = RDBExpression.Less;
}
else if (lo == ExpressionType.LessThanOrEqual)
{
exp = RDBExpression.LessEqual;
}
else if (lo == ExpressionType.GreaterThan)
{
exp = RDBExpression.Greater;
}
else if (lo == ExpressionType.GreaterThanOrEqual)
{
exp = RDBExpression.GreaterEqual;
}
else if (lo == ExpressionType.NotEqual)
{
exp = RDBExpression.NotEqual;
}
_bitmap.Push(qexpression("" + ln, exp, lv));
}
if (t == ExpressionType.And || t == ExpressionType.AndAlso ||
t == ExpressionType.Or || t == ExpressionType.OrElse)
{
if (_bitmap.Count > 1)
{
// do bitmap operations
WAHBitArray r = (WAHBitArray)_bitmap.Pop();
WAHBitArray l = (WAHBitArray)_bitmap.Pop();
if (t == ExpressionType.And || t == ExpressionType.AndAlso)
{
_bitmap.Push(r.And(l));
}
if (t == ExpressionType.Or || t == ExpressionType.OrElse)
{
_bitmap.Push(r.Or(l));
}
}
else
{
// single bitmap operation
}
}
return(b);
}
private static WAHBitArray DoBitOperation(WAHBitArray bits, WAHBitArray c, OPERATION op, int maxsize)
{
if (bits != null)
{
switch (op)
{
case OPERATION.AND:
bits = c.And(bits);
break;
case OPERATION.OR:
bits = c.Or(bits);
break;
case OPERATION.ANDNOT:
bits = c.And(bits.Not(maxsize));
break;
}
}
else
bits = c;
return bits;
}