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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / SimpleExpression.cs / 1305376 / SimpleExpression.cs
using System; using System.Collections.Generic; using System.Linq.Expressions; using System.Reflection; using System.Data.Linq; using System.Data.Linq.Mapping; using System.Data.Linq.Provider; using System.Linq; using System.Data.Linq.SqlClient; using System.Diagnostics.CodeAnalysis; namespace System.Data.Linq.SqlClient { ////// Determines whether an expression is simple or not. /// Simple is a scalar expression that contains only functions, operators and column references /// internal static class SimpleExpression { internal static bool IsSimple(SqlExpression expr) { Visitor v = new Visitor(); v.Visit(expr); return v.IsSimple; } class Visitor : SqlVisitor { bool isSimple = true; internal bool IsSimple { get { return this.isSimple; } } [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.")] internal override SqlNode Visit(SqlNode node) { if (node == null) { return null; } if (!this.isSimple) { return node; } switch (node.NodeType) { case SqlNodeType.Not: case SqlNodeType.Not2V: case SqlNodeType.Negate: case SqlNodeType.BitNot: case SqlNodeType.IsNull: case SqlNodeType.IsNotNull: case SqlNodeType.ValueOf: case SqlNodeType.OuterJoinedValue: case SqlNodeType.ClrLength: case SqlNodeType.Add: case SqlNodeType.Sub: case SqlNodeType.Mul: case SqlNodeType.Div: case SqlNodeType.Mod: case SqlNodeType.BitAnd: case SqlNodeType.BitOr: case SqlNodeType.BitXor: case SqlNodeType.And: case SqlNodeType.Or: case SqlNodeType.GE: case SqlNodeType.GT: case SqlNodeType.LE: case SqlNodeType.LT: case SqlNodeType.EQ: case SqlNodeType.NE: case SqlNodeType.EQ2V: case SqlNodeType.NE2V: case SqlNodeType.Between: case SqlNodeType.Concat: case SqlNodeType.Convert: case SqlNodeType.Treat: case SqlNodeType.Member: case SqlNodeType.TypeCase: case SqlNodeType.SearchedCase: case SqlNodeType.SimpleCase: case SqlNodeType.Like: case SqlNodeType.FunctionCall: case SqlNodeType.ExprSet: case SqlNodeType.OptionalValue: case SqlNodeType.Parameter: case SqlNodeType.ColumnRef: case SqlNodeType.Value: case SqlNodeType.Variable: return base.Visit(node); case SqlNodeType.Column: case SqlNodeType.ClientCase: case SqlNodeType.DiscriminatedType: case SqlNodeType.Link: case SqlNodeType.Row: case SqlNodeType.UserQuery: case SqlNodeType.StoredProcedureCall: case SqlNodeType.UserRow: case SqlNodeType.UserColumn: case SqlNodeType.Multiset: case SqlNodeType.ScalarSubSelect: case SqlNodeType.Element: case SqlNodeType.Exists: case SqlNodeType.Join: case SqlNodeType.Select: case SqlNodeType.New: case SqlNodeType.ClientQuery: case SqlNodeType.ClientArray: case SqlNodeType.Insert: case SqlNodeType.Update: case SqlNodeType.Delete: case SqlNodeType.MemberAssign: case SqlNodeType.Assign: case SqlNodeType.Block: case SqlNodeType.Union: case SqlNodeType.DoNotVisit: case SqlNodeType.MethodCall: case SqlNodeType.Nop: default: this.isSimple = false; return node; } } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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