SimpleExpression.cs source code in C# .NET

                        Code:
                         / Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / SimpleExpression.cs / 1 / 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.Cast: 
                    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.
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.Cast: 
                    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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SimpleExpression.cs source code in C# .NET

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