SqlSupersetValidator.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DLinq / Dlinq / SqlClient / Query / SqlSupersetValidator.cs / 1305376 / SqlSupersetValidator.cs
                        
                        
                            using System; 
using System.Collections.Generic;
using System.Text;

namespace System.Data.Linq.SqlClient { 

    ///  
    /// Validates the integrity of super-SQL trees. 
    /// 
    internal class SqlSupersetValidator { 

        List validators = new List();

        ///  
        /// Add a validator to the collection of validators to run.
        ///  
        internal void AddValidator(SqlVisitor validator) { 
            this.validators.Add(validator);
        } 

        /// 
        /// Execute each current validator.
        ///  
        internal void Validate(SqlNode node) {
            foreach (SqlVisitor validator in this.validators) { 
                validator.Visit(node); 
            }
        } 
    }

    /// 
    /// Column ClrType must agree with the expression that it points to. 
    /// 
    internal class ColumnTypeValidator : SqlVisitor { 
 
        internal override SqlRow VisitRow(SqlRow row) {
            for (int i = 0, n = row.Columns.Count; i < n; i++) { 
                SqlColumn col = row.Columns[i];
                SqlExpression expr = this.VisitExpression(col.Expression);
                if (expr != null) {
                    if (TypeSystem.GetNonNullableType(col.ClrType) != TypeSystem.GetNonNullableType(expr.ClrType)) { 
                        throw Error.ColumnClrTypeDoesNotAgreeWithExpressionsClrType();
                    } 
                } 
            }
            return row; 
        }
    }

    ///  
    /// A validator that ensures literal values are reasonable.
    ///  
    internal class LiteralValidator : SqlVisitor { 

        internal override SqlExpression VisitValue(SqlValue value) { 
            if (!value.IsClientSpecified
                && value.ClrType.IsClass
                && value.ClrType != typeof(string)
                && value.ClrType != typeof(Type) 
                && value.Value != null) {
                throw Error.ClassLiteralsNotAllowed(value.ClrType); 
            } 
            return value;
        } 

        internal override SqlExpression VisitBinaryOperator(SqlBinary bo) {
            bo.Left = this.VisitExpression(bo.Left);
            return bo; 
        }
    } 
 
    /// 
    /// A validator which enforces rationalized boolean expressions. 
    /// 
    internal class ExpectRationalizedBooleans : SqlBooleanMismatchVisitor {

        internal ExpectRationalizedBooleans() { 
        }
 
        internal override SqlExpression ConvertValueToPredicate(SqlExpression bitExpression) { 
            throw Error.ExpectedPredicateFoundBit();
        } 

        internal override SqlExpression ConvertPredicateToValue(SqlExpression predicateExpression) {
            throw Error.ExpectedBitFoundPredicate();
        } 
    }
 
    ///  
    /// A validator which enforces that no more SqlMethodCall nodes exist in the tree.
    ///  
    internal class ExpectNoMethodCalls : SqlVisitor {

        internal override SqlExpression VisitMethodCall(SqlMethodCall mc) {
            // eventually we may support this type of stuff given the SQL CLR, but for now it is illegal 
            throw Error.MethodHasNoSupportConversionToSql(mc.Method.Name);
        } 
 
        // check everything except selection expressions (which will be client or ignored)
        internal override SqlSelect VisitSelect(SqlSelect select) { 
            return this.VisitSelectCore(select);
        }
    }
 
    internal class ExpectNoFloatingColumns : SqlVisitor {
        internal override SqlRow VisitRow(SqlRow row) { 
            foreach (SqlColumn c in row.Columns) { 
                this.Visit(c.Expression);
            } 
            return row;
        }
        internal override SqlTable VisitTable(SqlTable tab) {
            foreach (SqlColumn c in tab.Columns) { 
                this.Visit(c.Expression);
            } 
            return tab; 
        }
        internal override SqlExpression VisitColumn(SqlColumn col) { 
            throw Error.UnexpectedFloatingColumn();
        }
    }
 
    internal class ExpectNoAliasRefs : SqlVisitor {
        internal override SqlExpression VisitAliasRef(SqlAliasRef aref) { 
            throw Error.UnexpectedNode(aref.NodeType); 
        }
    } 

    internal class ExpectNoSharedExpressions : SqlVisitor {
        internal override SqlExpression VisitSharedExpression(SqlSharedExpression shared) {
            throw Error.UnexpectedSharedExpression(); 
        }
        internal override SqlExpression VisitSharedExpressionRef(SqlSharedExpressionRef sref) { 
            throw Error.UnexpectedSharedExpressionReference(); 
        }
    } 

    /// 
    /// Determines if there is a boolean NText/Text/Image comparison and if so throws an exception
    /// because this is not valid in SQLServer. 
    /// 
    internal class ValidateNoInvalidComparison : SqlVisitor { 
 
        internal override SqlExpression VisitBinaryOperator(SqlBinary bo) {
            if (bo.NodeType == SqlNodeType.EQ || bo.NodeType == SqlNodeType.NE || 
                bo.NodeType == SqlNodeType.EQ2V || bo.NodeType == SqlNodeType.NE2V ||
                bo.NodeType == SqlNodeType.GT || bo.NodeType == SqlNodeType.GE ||
                bo.NodeType == SqlNodeType.LT || bo.NodeType == SqlNodeType.LE ) {
                if (!bo.Left.SqlType.SupportsComparison || 
                    !bo.Right.SqlType.SupportsComparison){
                    throw Error.UnhandledStringTypeComparison(); 
                } 
            }
            bo.Left = this.VisitExpression(bo.Left); 
            bo.Right = this.VisitExpression(bo.Right);
            return bo;
        }
 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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SqlSupersetValidator.cs source code in C# .NET

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