Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / CommandTrees / Internal / Validator.cs / 1305376 / Validator.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Globalization; using System.Data.Common; using System.Data.Metadata.Edm; using System.Linq; using System.Diagnostics; namespace System.Data.Common.CommandTrees.Internal { internal sealed class DbExpressionValidator : DbExpressionRebinder { private readonly DataSpace requiredSpace; private readonly DataSpace[] allowedMetadataSpaces; private readonly DataSpace[] allowedFunctionSpaces; private readonly DictionaryparamMappings = new Dictionary (); private readonly Stack > variableScopes = new Stack >(); private string expressionArgumentName; internal DbExpressionValidator(MetadataWorkspace metadata, DataSpace expectedDataSpace) : base(metadata) { this.requiredSpace = expectedDataSpace; this.allowedFunctionSpaces = new[] { DataSpace.CSpace, DataSpace.SSpace }; if (expectedDataSpace == DataSpace.SSpace) { this.allowedMetadataSpaces = new[] { DataSpace.SSpace, DataSpace.CSpace }; } else { this.allowedMetadataSpaces = new[] { DataSpace.CSpace }; } } internal Dictionary Parameters { get { return this.paramMappings; } } internal void ValidateExpression(DbExpression expression, string argumentName) { Debug.Assert(expression != null, "Ensure expression is non-null before calling ValidateExpression"); this.expressionArgumentName = argumentName; this.VisitExpression(expression); this.expressionArgumentName = null; Debug.Assert(this.variableScopes.Count == 0, "Variable scope stack left in inconsistent state"); } protected override EntitySetBase VisitEntitySet(EntitySetBase entitySet) { return ValidateMetadata(entitySet, base.VisitEntitySet, es => es.EntityContainer.DataSpace, this.allowedMetadataSpaces); } protected override EdmFunction VisitFunction(EdmFunction function) { // Functions from the current space and S-Space are allowed return ValidateMetadata(function, base.VisitFunction, func => func.DataSpace, this.allowedFunctionSpaces); } protected override EdmType VisitType(EdmType type) { return ValidateMetadata(type, base.VisitType, et => et.DataSpace, this.allowedMetadataSpaces); } protected override TypeUsage VisitTypeUsage(TypeUsage type) { return ValidateMetadata(type, base.VisitTypeUsage, tu => tu.EdmType.DataSpace, this.allowedMetadataSpaces); } protected override void OnEnterScope(IEnumerable scopeVariables) { var newScope = scopeVariables.ToDictionary(var => var.VariableName, var => var.ResultType, StringComparer.Ordinal); this.variableScopes.Push(newScope); } protected override void OnExitScope() { this.variableScopes.Pop(); } public override DbExpression Visit(DbVariableReferenceExpression expression) { DbExpression result = base.Visit(expression); if(result.ExpressionKind == DbExpressionKind.VariableReference) { DbVariableReferenceExpression varRef = (DbVariableReferenceExpression)result; TypeUsage foundType = null; foreach(Dictionary scope in this.variableScopes) { if(scope.TryGetValue(varRef.VariableName, out foundType)) { break; } } if(foundType == null) { ThrowInvalid(System.Data.Entity.Strings.Cqt_Validator_VarRefInvalid(varRef.VariableName)); } // SQLBUDT#545720: Equivalence is not a sufficient check (consider row types) - equality is required. if (!TypeSemantics.IsEqual(varRef.ResultType, foundType)) { ThrowInvalid(System.Data.Entity.Strings.Cqt_Validator_VarRefTypeMismatch(varRef.VariableName)); } } return result; } public override DbExpression Visit(DbParameterReferenceExpression expression) { DbExpression result = base.Visit(expression); if (result.ExpressionKind == DbExpressionKind.ParameterReference) { DbParameterReferenceExpression paramRef = result as DbParameterReferenceExpression; DbParameterReferenceExpression foundParam; if (this.paramMappings.TryGetValue(paramRef.ParameterName, out foundParam)) { // SQLBUDT#545720: Equivalence is not a sufficient check (consider row types for TVPs) - equality is required. if (!TypeSemantics.IsEqual(paramRef.ResultType, foundParam.ResultType)) { ThrowInvalid(Entity.Strings.Cqt_Validator_InvalidIncompatibleParameterReferences(paramRef.ParameterName)); } } else { this.paramMappings.Add(paramRef.ParameterName, paramRef); } } return result; } private TMetadata ValidateMetadata (TMetadata metadata, Func map, Func getDataSpace, DataSpace[] allowedSpaces) { TMetadata result = map(metadata); if (!object.ReferenceEquals(metadata, result)) { ThrowInvalidMetadata(metadata); } DataSpace resultSpace = getDataSpace(result); if (!allowedSpaces.Any(ds => ds == resultSpace)) { ThrowInvalidSpace(metadata); } return result; } private void ThrowInvalidMetadata (TMetadata invalid) { ThrowInvalid(Entity.Strings.Cqt_Validator_InvalidOtherWorkspaceMetadata(typeof(TMetadata).Name)); } private void ThrowInvalidSpace (TMetadata invalid) { ThrowInvalid(Entity.Strings.Cqt_Validator_InvalidIncorrectDataSpaceMetadata(typeof(TMetadata).Name, Enum.GetName(typeof(DataSpace), this.requiredSpace))); } private void ThrowInvalid(string message) { throw EntityUtil.Argument(message, this.expressionArgumentName); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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