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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / SqlBooleanMismatchVisitor.cs / 1305376 / SqlBooleanMismatchVisitor.cs
using System; using System.Collections.Generic; using System.Linq; using System.Linq.Expressions; using System.Data; namespace System.Data.Linq.SqlClient { using System.Data.Linq; using System.Diagnostics.CodeAnalysis; ////// This visitor searches for places where 'Predicate' is found but a 'Bit' /// was expected or vice versa. In response, it will call VisitBitExpectedPredicate /// and VisitPredicateExpectedBit. /// internal abstract class SqlBooleanMismatchVisitor : SqlVisitor { internal SqlBooleanMismatchVisitor() { } internal abstract SqlExpression ConvertValueToPredicate(SqlExpression valueExpression); internal abstract SqlExpression ConvertPredicateToValue(SqlExpression predicateExpression); internal override SqlSelect VisitSelect(SqlSelect select) { select.From = this.VisitSource(select.From); select.Where = this.VisitPredicate(select.Where); for (int i = 0, n = select.GroupBy.Count; i < n; i++) { select.GroupBy[i] = this.VisitExpression(select.GroupBy[i]); } select.Having = this.VisitPredicate(select.Having); for (int i = 0, n = select.OrderBy.Count; i < n; i++) { select.OrderBy[i].Expression = this.VisitExpression(select.OrderBy[i].Expression); } select.Top = this.VisitExpression(select.Top); select.Row = (SqlRow)this.Visit(select.Row); // don't visit selection //select.Selection = this.VisitExpression(select.Selection); return select; } internal override SqlSource VisitJoin(SqlJoin join) { join.Left = this.VisitSource(join.Left); join.Right = this.VisitSource(join.Right); join.Condition = this.VisitPredicate(join.Condition); return join; } internal override SqlExpression VisitUnaryOperator(SqlUnary uo) { if (uo.NodeType.IsUnaryOperatorExpectingPredicateOperand()) { uo.Operand = this.VisitPredicate(uo.Operand); } else { uo.Operand = this.VisitExpression(uo.Operand); } return uo; } internal override SqlExpression VisitBinaryOperator(SqlBinary bo) { if (bo.NodeType.IsBinaryOperatorExpectingPredicateOperands()) { bo.Left = this.VisitPredicate(bo.Left); bo.Right = this.VisitPredicate(bo.Right); } else { bo.Left = this.VisitExpression(bo.Left); bo.Right = this.VisitExpression(bo.Right); } return bo; } internal override SqlStatement VisitAssign(SqlAssign sa) { // L-Value of assign is never a 'Bit' nor a 'Predicate'. sa.LValue = this.VisitExpression(sa.LValue); sa.RValue = this.VisitExpression(sa.RValue); return sa; } internal override SqlExpression VisitSearchedCase(SqlSearchedCase c) { for (int i = 0, n = c.Whens.Count; i < n; i++) { SqlWhen when = c.Whens[i]; when.Match = this.VisitPredicate(when.Match); when.Value = this.VisitExpression(when.Value); } c.Else = this.VisitExpression(c.Else); return c; } internal override SqlExpression VisitLift(SqlLift lift) { lift.Expression = base.VisitExpression(lift.Expression); return lift; } ////// If an expression is type 'Bit' but a 'Predicate' is expected then /// call 'VisitBitExpectedPredicate'. /// internal SqlExpression VisitPredicate(SqlExpression exp) { exp = (SqlExpression)base.Visit(exp); if (exp != null) { if (!IsPredicateExpression(exp)) { exp = ConvertValueToPredicate(exp); } } return exp; } ////// Any remaining calls to VisitExpression expect a 'Bit' when there's /// a boolean expression. /// internal override SqlExpression VisitExpression(SqlExpression exp) { exp = (SqlExpression)base.Visit(exp); if (exp != null) { if (IsPredicateExpression(exp)) { exp = ConvertPredicateToValue(exp); } } return exp; } [SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification = "These issues are related to our use of if-then and case statements for node types, which adds to the complexity count however when reviewed they are easy to navigate and understand.")] private static bool IsPredicateExpression(SqlExpression exp) { switch (exp.NodeType) { case SqlNodeType.And: case SqlNodeType.Or: case SqlNodeType.Not: case SqlNodeType.Not2V: case SqlNodeType.EQ: case SqlNodeType.EQ2V: case SqlNodeType.NE: case SqlNodeType.NE2V: case SqlNodeType.GE: case SqlNodeType.GT: case SqlNodeType.LE: case SqlNodeType.LT: case SqlNodeType.Exists: case SqlNodeType.Between: case SqlNodeType.In: case SqlNodeType.Like: case SqlNodeType.IsNotNull: case SqlNodeType.IsNull: return true; case SqlNodeType.Lift: return IsPredicateExpression(((SqlLift)exp).Expression); default: return false; } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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