ViewValidator.cs source code in C# .NET

                        Code:
                         / Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / ndp / fx / src / DataEntity / System / Data / Mapping / ViewValidator.cs / 2 / ViewValidator.cs
                        
                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System.Data.Metadata.Edm;
using System.Globalization; 
using System.Data.Common.CommandTrees;
using System.Collections.Generic;
using System.Diagnostics;
using System.Data.Entity; 

namespace System.Data.Mapping 
{ 
    /// 
    /// Verifies that only legal expressions exist in a user-defined query mapping view. 
    ///
    /// -	ViewExpr = (see ViewExpressionValidator)
    ///         Project(Projection, ViewExpr) |
    ///         Project(Value, ViewExpr) | 
    ///         Filter(ViewExpr, ViewExpr) |
    ///         Join(ViewExpr, ViewExpr, ViewExpr) | 
    ///         UnionAll(ViewExpr, ViewExpr) | 
    ///         Scan(S-Space EntitySet)
    ///         Constant | 
    ///         Property{StructuralProperty}(ViewExpr) |
    ///         Null |
    ///         VariableReference |
    ///         Cast(ViewExpr) | 
    ///         Case([Predicate, ViewExpr]*, ViewExpr) |
    ///         Comparison(ViewExpr, ViewExpr) | 
    ///         Not(ViewExpr) | 
    ///         And(ViewExpr, ViewExpr) |
    ///         Or(ViewExpr, ViewExpr) | 
    ///         IsNull(ViewExpr)
    /// -	Projection = (see ViewExpressionValidator.Visit(DbProjectExpression)
    ///         NewInstance{TargetEntity}(ViewExpr*) |
    ///         NewInstance{Row}(ViewExpr*) 
    /// 
    internal static class ViewValidator 
    { 
        /// 
        /// Determines whether the given view is valid. 
        /// 
        /// Query view to validate.
        /// Store item collection.
        /// Mapping in which view is declared. 
        /// Errors in view definition.
        internal static IEnumerable ValidateQueryView(DbQueryCommandTree view, StoreItemCollection storeItemCollection, StorageSetMapping setMapping, EntityTypeBase elementType, bool includeSubtypes) 
        { 
            ViewExpressionValidator validator = new ViewExpressionValidator(storeItemCollection, setMapping, elementType, includeSubtypes);
            validator.VisitExpression(view.Query); 
            return validator.Errors;
        }

        private sealed class ViewExpressionValidator : BasicExpressionVisitor 
        {
            private readonly StorageSetMapping _setMapping; 
            private readonly StoreItemCollection _storeItemCollection; 
            private readonly List _errors;
            private readonly EntityTypeBase _elementType; 
            private readonly bool _includeSubtypes;

            internal ViewExpressionValidator(StoreItemCollection storeItemCollection, StorageSetMapping setMapping, EntityTypeBase elementType, bool includeSubtypes)
            { 
                Debug.Assert(null != setMapping);
                Debug.Assert(null != storeItemCollection); 
                _setMapping = setMapping; 
                _storeItemCollection = storeItemCollection;
                _errors = new List(); 
                _elementType = elementType;
                _includeSubtypes = includeSubtypes;
            }
 
            internal IEnumerable Errors { get { return _errors; } }
 
            public override void VisitExpression(DbExpression expression) 
            {
                if (null != expression) 
                {
                    ValidateExpressionKind(expression.ExpressionKind);
                }
                base.VisitExpression(expression); 
            }
 
            private void ValidateExpressionKind(DbExpressionKind expressionKind) 
            {
                switch (expressionKind) 
                {
                    // Supported expression kinds
                    case DbExpressionKind.Constant:
                    case DbExpressionKind.Property: 
                    case DbExpressionKind.Null:
                    case DbExpressionKind.VariableReference: 
                    case DbExpressionKind.Cast: 
                    case DbExpressionKind.Case:
                    case DbExpressionKind.Not: 
                    case DbExpressionKind.Or:
                    case DbExpressionKind.And:
                    case DbExpressionKind.IsNull:
                    case DbExpressionKind.Equals: 
                    case DbExpressionKind.NotEquals:
                    case DbExpressionKind.LessThan: 
                    case DbExpressionKind.LessThanOrEquals: 
                    case DbExpressionKind.GreaterThan:
                    case DbExpressionKind.GreaterThanOrEquals: 
                    case DbExpressionKind.Project:
                    case DbExpressionKind.NewInstance:
                    case DbExpressionKind.Filter:
                    case DbExpressionKind.Ref: 
                    case DbExpressionKind.UnionAll:
                    case DbExpressionKind.Scan: 
                    case DbExpressionKind.FullOuterJoin: 
                    case DbExpressionKind.LeftOuterJoin:
                    case DbExpressionKind.InnerJoin: 
                    case DbExpressionKind.EntityRef:
                        break;
                    default:
                        string elementString = (_includeSubtypes)?"IsTypeOf("+_elementType.ToString()+")":_elementType.ToString(); 
                        _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedExpressionKind_QueryView_2(
                            _setMapping.Set.Name, elementString, expressionKind), (int)StorageMappingErrorCode.MappingUnsupportedExpressionKindQueryView, 
                            EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber, 
                            _setMapping.StartLinePosition));
                        break; 
                }
            }

            public override void Visit(DbPropertyExpression expression) 
            {
                base.Visit(expression); 
                if (expression.Property.BuiltInTypeKind != BuiltInTypeKind.EdmProperty) 
                {
                    _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedPropertyKind_QueryView_3( 
                        _setMapping.Set.Name, expression.Property.Name, expression.Property.BuiltInTypeKind), (int)StorageMappingErrorCode.MappingUnsupportedPropertyKindQueryView,
                        EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber,
                        _setMapping.StartLinePosition));
 
                }
            } 
 
            public override void Visit(DbNewInstanceExpression expression)
            { 
                base.Visit(expression);
                EdmType type = expression.ResultType.EdmType;
                if (type.BuiltInTypeKind != BuiltInTypeKind.RowType)
                { 
                    // restrict initialization of non-row types to the target of the view
                    if (!_setMapping.Set.ElementType.IsAssignableFrom(type)) 
                    { 
                        _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedInitialization_QueryView_2(
                            _setMapping.Set.Name, type.FullName), (int)StorageMappingErrorCode.MappingUnsupportedInitializationQueryView, 
                            EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber,
                            _setMapping.StartLinePosition));
                    }
                } 
            }
 
            public override void Visit(DbScanExpression expression) 
            {
                base.Visit(expression); 
                Debug.Assert(null != expression.Target);

                // verify scan target is in S-space
                EntitySetBase target = expression.Target; 
                EntityContainer targetContainer = target.EntityContainer;
                Debug.Assert(null != target.EntityContainer); 
 
                if ((targetContainer.DataSpace != DataSpace.SSpace))
                { 
                    _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedScanTarget_QueryView_2(
                        _setMapping.Set.Name, target.Name), (int)StorageMappingErrorCode.MappingUnsupportedScanTargetQueryView,
                        EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber,
                        _setMapping.StartLinePosition)); 
                }
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
//---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....], [....]
//--------------------------------------------------------------------- 
 
using System.Data.Metadata.Edm;
using System.Globalization; 
using System.Data.Common.CommandTrees;
using System.Collections.Generic;
using System.Diagnostics;
using System.Data.Entity; 

namespace System.Data.Mapping 
{ 
    /// 
    /// Verifies that only legal expressions exist in a user-defined query mapping view. 
    ///
    /// -	ViewExpr = (see ViewExpressionValidator)
    ///         Project(Projection, ViewExpr) |
    ///         Project(Value, ViewExpr) | 
    ///         Filter(ViewExpr, ViewExpr) |
    ///         Join(ViewExpr, ViewExpr, ViewExpr) | 
    ///         UnionAll(ViewExpr, ViewExpr) | 
    ///         Scan(S-Space EntitySet)
    ///         Constant | 
    ///         Property{StructuralProperty}(ViewExpr) |
    ///         Null |
    ///         VariableReference |
    ///         Cast(ViewExpr) | 
    ///         Case([Predicate, ViewExpr]*, ViewExpr) |
    ///         Comparison(ViewExpr, ViewExpr) | 
    ///         Not(ViewExpr) | 
    ///         And(ViewExpr, ViewExpr) |
    ///         Or(ViewExpr, ViewExpr) | 
    ///         IsNull(ViewExpr)
    /// -	Projection = (see ViewExpressionValidator.Visit(DbProjectExpression)
    ///         NewInstance{TargetEntity}(ViewExpr*) |
    ///         NewInstance{Row}(ViewExpr*) 
    /// 
    internal static class ViewValidator 
    { 
        /// 
        /// Determines whether the given view is valid. 
        /// 
        /// Query view to validate.
        /// Store item collection.
        /// Mapping in which view is declared. 
        /// Errors in view definition.
        internal static IEnumerable ValidateQueryView(DbQueryCommandTree view, StoreItemCollection storeItemCollection, StorageSetMapping setMapping, EntityTypeBase elementType, bool includeSubtypes) 
        { 
            ViewExpressionValidator validator = new ViewExpressionValidator(storeItemCollection, setMapping, elementType, includeSubtypes);
            validator.VisitExpression(view.Query); 
            return validator.Errors;
        }

        private sealed class ViewExpressionValidator : BasicExpressionVisitor 
        {
            private readonly StorageSetMapping _setMapping; 
            private readonly StoreItemCollection _storeItemCollection; 
            private readonly List _errors;
            private readonly EntityTypeBase _elementType; 
            private readonly bool _includeSubtypes;

            internal ViewExpressionValidator(StoreItemCollection storeItemCollection, StorageSetMapping setMapping, EntityTypeBase elementType, bool includeSubtypes)
            { 
                Debug.Assert(null != setMapping);
                Debug.Assert(null != storeItemCollection); 
                _setMapping = setMapping; 
                _storeItemCollection = storeItemCollection;
                _errors = new List(); 
                _elementType = elementType;
                _includeSubtypes = includeSubtypes;
            }
 
            internal IEnumerable Errors { get { return _errors; } }
 
            public override void VisitExpression(DbExpression expression) 
            {
                if (null != expression) 
                {
                    ValidateExpressionKind(expression.ExpressionKind);
                }
                base.VisitExpression(expression); 
            }
 
            private void ValidateExpressionKind(DbExpressionKind expressionKind) 
            {
                switch (expressionKind) 
                {
                    // Supported expression kinds
                    case DbExpressionKind.Constant:
                    case DbExpressionKind.Property: 
                    case DbExpressionKind.Null:
                    case DbExpressionKind.VariableReference: 
                    case DbExpressionKind.Cast: 
                    case DbExpressionKind.Case:
                    case DbExpressionKind.Not: 
                    case DbExpressionKind.Or:
                    case DbExpressionKind.And:
                    case DbExpressionKind.IsNull:
                    case DbExpressionKind.Equals: 
                    case DbExpressionKind.NotEquals:
                    case DbExpressionKind.LessThan: 
                    case DbExpressionKind.LessThanOrEquals: 
                    case DbExpressionKind.GreaterThan:
                    case DbExpressionKind.GreaterThanOrEquals: 
                    case DbExpressionKind.Project:
                    case DbExpressionKind.NewInstance:
                    case DbExpressionKind.Filter:
                    case DbExpressionKind.Ref: 
                    case DbExpressionKind.UnionAll:
                    case DbExpressionKind.Scan: 
                    case DbExpressionKind.FullOuterJoin: 
                    case DbExpressionKind.LeftOuterJoin:
                    case DbExpressionKind.InnerJoin: 
                    case DbExpressionKind.EntityRef:
                        break;
                    default:
                        string elementString = (_includeSubtypes)?"IsTypeOf("+_elementType.ToString()+")":_elementType.ToString(); 
                        _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedExpressionKind_QueryView_2(
                            _setMapping.Set.Name, elementString, expressionKind), (int)StorageMappingErrorCode.MappingUnsupportedExpressionKindQueryView, 
                            EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber, 
                            _setMapping.StartLinePosition));
                        break; 
                }
            }

            public override void Visit(DbPropertyExpression expression) 
            {
                base.Visit(expression); 
                if (expression.Property.BuiltInTypeKind != BuiltInTypeKind.EdmProperty) 
                {
                    _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedPropertyKind_QueryView_3( 
                        _setMapping.Set.Name, expression.Property.Name, expression.Property.BuiltInTypeKind), (int)StorageMappingErrorCode.MappingUnsupportedPropertyKindQueryView,
                        EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber,
                        _setMapping.StartLinePosition));
 
                }
            } 
 
            public override void Visit(DbNewInstanceExpression expression)
            { 
                base.Visit(expression);
                EdmType type = expression.ResultType.EdmType;
                if (type.BuiltInTypeKind != BuiltInTypeKind.RowType)
                { 
                    // restrict initialization of non-row types to the target of the view
                    if (!_setMapping.Set.ElementType.IsAssignableFrom(type)) 
                    { 
                        _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedInitialization_QueryView_2(
                            _setMapping.Set.Name, type.FullName), (int)StorageMappingErrorCode.MappingUnsupportedInitializationQueryView, 
                            EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber,
                            _setMapping.StartLinePosition));
                    }
                } 
            }
 
            public override void Visit(DbScanExpression expression) 
            {
                base.Visit(expression); 
                Debug.Assert(null != expression.Target);

                // verify scan target is in S-space
                EntitySetBase target = expression.Target; 
                EntityContainer targetContainer = target.EntityContainer;
                Debug.Assert(null != target.EntityContainer); 
 
                if ((targetContainer.DataSpace != DataSpace.SSpace))
                { 
                    _errors.Add(new EdmSchemaError(System.Data.Entity.Strings.Mapping_UnsupportedScanTarget_QueryView_2(
                        _setMapping.Set.Name, target.Name), (int)StorageMappingErrorCode.MappingUnsupportedScanTargetQueryView,
                        EdmSchemaErrorSeverity.Error, _setMapping.EntityContainerMapping.SourceLocation, _setMapping.StartLineNumber,
                        _setMapping.StartLinePosition)); 
                }
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ViewValidator.cs source code in C# .NET

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