abstract private Optimize ( ) : |
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return |
/// <include file='doc\DataExpression.uex' path='docs/doc[@for="DataExpression.Bind"]/*' /> public virtual void Bind(DataTable table) { #if DEBUG if (CompModSwitches.DataExpression.TraceVerbose) { Debug.WriteLine("Bind current expression in the table " + (table != null ? table.TableName : "null")); } #endif this.table = table; if (table == null) { return; } if (expr != null) { Debug.Assert(parsed, "Invalid calling order: Bind() before Parse()"); ArrayList list = new ArrayList(); expr.Bind(table, list); expr = expr.Optimize(); this.table = table; optimizedExpression = null; Debug.Assert(list != null, "Invlid dependency list"); bound = true; dependency = new DataColumn[list.Count]; list.CopyTo(dependency, 0); #if DEBUG if (dependency == null) { if (CompModSwitches.DataExpression.TraceVerbose) { Debug.WriteLine("no dependencies"); } } else { if (CompModSwitches.DataExpression.TraceVerbose) { Debug.WriteLine("have dependencies: " + dependency.Length.ToString()); } for (int i = 0; i < dependency.Length; i++) { //UNDONE : Debug.WriteLineIf("DataExpression", dependency[i].ColumnName); } } #endif } }
internal override ExpressionNode Optimize() { _right = _right.Optimize(); if (IsConstant()) { object val = Eval(); return(new ConstNode(table, ValueType.Object, val, false)); } else { return(this); } }
internal void Bind(DataTable table) { _table = table; if (table == null) { return; } if (_expr != null) { Debug.Assert(_parsed, "Invalid calling order: Bind() before Parse()"); List <DataColumn> list = new List <DataColumn>(); _expr.Bind(table, list); _expr = _expr.Optimize(); _table = table; _bound = true; _dependency = list.ToArray(); } }
internal override ExpressionNode Optimize() { left = left.Optimize(); if (op == Operators.Is) { // only 'Is Null' or 'Is Not Null' are valid if (right is UnaryNode) { UnaryNode un = (UnaryNode)right; if (un.op != Operators.Not) { throw ExprException.InvalidIsSyntax(); } op = Operators.IsNot; right = un.right; } if (right is ZeroOpNode) { if (((ZeroOpNode)right).op != Operators.Null) { throw ExprException.InvalidIsSyntax(); } } else { throw ExprException.InvalidIsSyntax(); } } else { right = right.Optimize(); } #if DEBUG if (CompModSwitches.BinaryNode.TraceVerbose) { Debug.WriteLine("Optimizing " + this.ToString()); } #endif if (this.IsConstant()) { object val = this.Eval(); #if DEBUG if (CompModSwitches.BinaryNode.TraceVerbose) { Debug.WriteLine("the node value is " + val.ToString()); } #endif if (val == DBNull.Value) { return(new ZeroOpNode(Operators.Null)); } if (val is bool) { if ((bool)val) { return(new ZeroOpNode(Operators.True)); } else { return(new ZeroOpNode(Operators.False)); } } #if DEBUG if (CompModSwitches.BinaryNode.TraceVerbose) { Debug.WriteLine(val.GetType().ToString()); } #endif return(new ConstNode(ValueType.Object, val, false)); } else { return(this); } }