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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / CommandTrees / BasicExpressionVisitor.cs / 1305376 / BasicExpressionVisitor.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Diagnostics; using System.Data.Metadata.Edm; namespace System.Data.Common.CommandTrees { ////// An abstract base type for types that implement the IExpressionVisitor interface to derive from. /// /*CQT_PUBLIC_API(*/internal/*)*/ abstract class BasicExpressionVisitor : DbExpressionVisitor { #region protected API, may be overridden to add functionality at specific points in the traversal ////// Convenience method to visit the specified /// The DbUnaryExpression to visit. ///. /// protected virtual void VisitUnaryExpression(DbUnaryExpression expression) { VisitExpression(EntityUtil.CheckArgumentNull(expression, "expression").Argument); } /// is null /// Convenience method to visit the specified /// The DbBinaryExpression to visit. ///. /// protected virtual void VisitBinaryExpression(DbBinaryExpression expression) { EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpression(expression.Left); VisitExpression(expression.Right); } /// is null /// Convenience method to visit the specified /// The DbExpressionBinding to visit. ///. /// protected virtual void VisitExpressionBindingPre(DbExpressionBinding binding) { EntityUtil.CheckArgumentNull(binding, "binding"); VisitExpression(binding.Expression); } /// is null /// Convenience method for post-processing after a DbExpressionBinding has been visited. /// /// The previously visited DbExpressionBinding. protected virtual void VisitExpressionBindingPost(DbExpressionBinding binding) { } ////// Convenience method to visit the specified /// The DbGroupExpressionBinding to visit. ///. /// protected virtual void VisitGroupExpressionBindingPre(DbGroupExpressionBinding binding) { EntityUtil.CheckArgumentNull(binding, "binding"); VisitExpression(binding.Expression); } /// is null /// Convenience method indicating that the grouping keys of a /// The DbGroupExpressionBinding of the DbGroupByExpression protected virtual void VisitGroupExpressionBindingMid(DbGroupExpressionBinding binding) { } ///have been visited and the aggregates are now about to be visited. /// /// Convenience method for post-processing after a DbGroupExpressionBinding has been visited. /// /// The previously visited DbGroupExpressionBinding. protected virtual void VisitGroupExpressionBindingPost(DbGroupExpressionBinding binding) { } ////// Convenience method indicating that the body of a Lambda /// The DbLambda that is about to be visited ///is now about to be visited. /// protected virtual void VisitLambdaPre(DbLambda lambda) { EntityUtil.CheckArgumentNull(lambda, "lambda"); } /// is null /// Convenience method for post-processing after a DbLambda has been visited. /// /// The previously visited DbLambda. protected virtual void VisitLambdaPost(DbLambda lambda) { } #endregion #region public convenience API ////// Convenience method to visit the specified /// The expression to visit. ///, if non-null. /// public virtual void VisitExpression(DbExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression").Accept(this); } /// is null /// Convenience method to visit each /// The list of expressions to visit. ///in the given list, if the list is non-null. /// public virtual void VisitExpressionList(IList is null expressionList) { EntityUtil.CheckArgumentNull(expressionList, "expressionList"); for(int idx = 0; idx < expressionList.Count; idx++) { VisitExpression(expressionList[idx]); } } /// /// Convenience method to visit each /// The list of aggregates to visit. ///in the list, if the list is non-null. /// public virtual void VisitAggregateList(IList is null aggregates) { EntityUtil.CheckArgumentNull(aggregates, "aggregates"); for(int idx = 0; idx < aggregates.Count; idx++) { VisitAggregate(aggregates[idx]); } } /// /// Convenience method to visit the specified /// The aggregate to visit. ///. /// public virtual void VisitAggregate(DbAggregate aggregate) { // #433613: PreSharp warning 56506: Parameter 'aggregate' to this public method must be validated: A null-dereference can occur here. VisitExpressionList(EntityUtil.CheckArgumentNull(aggregate, "aggregate").Arguments); } internal virtual void VisitRelatedEntityReferenceList(IList is null relatedEntityReferences) { for (int idx = 0; idx < relatedEntityReferences.Count; idx++) { this.VisitRelatedEntityReference(relatedEntityReferences[idx]); } } internal virtual void VisitRelatedEntityReference(DbRelatedEntityRef relatedEntityRef) { VisitExpression(relatedEntityRef.TargetEntityReference); } #endregion #region DbExpressionVisitor Members /// /// Called when an /// The expression ///of an otherwise unrecognized type is encountered. /// /// is null Always thrown if this method is called, since it indicates that public override void Visit(DbExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); throw EntityUtil.NotSupported(System.Data.Entity.Strings.Cqt_General_UnsupportedExpression(expression.GetType().FullName)); } ///is of an unsupported type /// Visitor pattern method for /// The DbConstantExpression that is being visited. ///. /// public override void Visit(DbConstantExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); } /// is null /// Visitor pattern method for /// The DbNullExpression that is being visited. ///. /// public override void Visit(DbNullExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); } /// is null /// Visitor pattern method for /// The DbVariableReferenceExpression that is being visited. ///. /// public override void Visit(DbVariableReferenceExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); } /// is null /// Visitor pattern method for /// The DbParameterReferenceExpression that is being visited. ///. /// public override void Visit(DbParameterReferenceExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); } /// is null /// Visitor pattern method for /// The DbFunctionExpression that is being visited. ///. /// public override void Visit(DbFunctionExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionList(expression.Arguments); } /// is null /// Visitor pattern method for /// The DbLambdaExpression that is being visited. ///. /// public override void Visit(DbLambdaExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionList(expression.Arguments); VisitLambdaPre(expression.Lambda); VisitExpression(expression.Lambda.Body); VisitLambdaPost(expression.Lambda); } #if METHOD_EXPRESSION /// is null /// Visitor pattern method for /// The MethodExpression that is being visited. ///. /// public override void Visit(MethodExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); if (expression.Instance != null) { VisitExpression(expression.Instance); } VisitExpressionList(expression.Arguments); } #endif /// is null /// Visitor pattern method for /// The DbPropertyExpression that is being visited. ///. /// public override void Visit(DbPropertyExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); if(expression.Instance != null) { VisitExpression(expression.Instance); } } /// is null /// Visitor pattern method for /// The DbComparisonExpression that is being visited. ///. /// public override void Visit(DbComparisonExpression expression) { VisitBinaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbLikeExpression that is being visited. ///. /// public override void Visit(DbLikeExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpression(expression.Argument); VisitExpression(expression.Pattern); VisitExpression(expression.Escape); } /// is null /// Visitor pattern method for /// The DbLimitExpression that is being visited. ///. /// public override void Visit(DbLimitExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpression(expression.Argument); VisitExpression(expression.Limit); } /// is null /// Visitor pattern method for /// The DbIsNullExpression that is being visited. ///. /// public override void Visit(DbIsNullExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbArithmeticExpression that is being visited. ///. /// public override void Visit(DbArithmeticExpression expression) { VisitExpressionList(EntityUtil.CheckArgumentNull(expression, "expression").Arguments); } /// is null /// Visitor pattern method for /// The DbAndExpression that is being visited. ///. /// public override void Visit(DbAndExpression expression) { VisitBinaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbOrExpression that is being visited. ///. /// public override void Visit(DbOrExpression expression) { VisitBinaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbNotExpression that is being visited. ///. /// public override void Visit(DbNotExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbDistinctExpression that is being visited. ///. /// public override void Visit(DbDistinctExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbElementExpression that is being visited. ///. /// public override void Visit(DbElementExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbIsEmptyExpression that is being visited. ///. /// public override void Visit(DbIsEmptyExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbUnionAllExpression that is being visited. ///. /// public override void Visit(DbUnionAllExpression expression) { VisitBinaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbIntersectExpression that is being visited. ///. /// public override void Visit(DbIntersectExpression expression) { VisitBinaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbExceptExpression that is being visited. ///. /// public override void Visit(DbExceptExpression expression) { VisitBinaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbOfTypeExpression that is being visited. ///. /// public override void Visit(DbOfTypeExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbTreatExpression that is being visited. ///. /// public override void Visit(DbTreatExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbCastExpression that is being visited. ///. /// public override void Visit(DbCastExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbIsOfExpression that is being visited. ///. /// public override void Visit(DbIsOfExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbCaseExpression that is being visited. ///. /// public override void Visit(DbCaseExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionList(expression.When); VisitExpressionList(expression.Then); VisitExpression(expression.Else); } /// is null /// Visitor pattern method for /// The DbNewInstanceExpression that is being visited. ///. /// public override void Visit(DbNewInstanceExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionList(expression.Arguments); if (expression.HasRelatedEntityReferences) { Debug.Assert(expression.RelatedEntityReferences != null, "HasRelatedEntityReferences returned true for null RelatedEntityReferences list?"); this.VisitRelatedEntityReferenceList(expression.RelatedEntityReferences); } } /// is null /// Visitor pattern method for /// The DbRefExpression that is being visited. ///. /// public override void Visit(DbRefExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbRelationshipNavigationExpression that is being visited. ///. /// public override void Visit(DbRelationshipNavigationExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. VisitExpression(EntityUtil.CheckArgumentNull(expression, "expression").NavigationSource); } /// is null /// Visitor pattern method for /// The DeRefExpression that is being visited. ///. /// public override void Visit(DbDerefExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbRefKeyExpression that is being visited. ///. /// public override void Visit(DbRefKeyExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbEntityRefExpression that is being visited. ///. /// public override void Visit(DbEntityRefExpression expression) { VisitUnaryExpression(expression); } /// is null /// Visitor pattern method for /// The DbScanExpression that is being visited. ///. /// public override void Visit(DbScanExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); } /// is null /// Visitor pattern method for /// The DbFilterExpression that is being visited. ///. /// public override void Visit(DbFilterExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionBindingPre(expression.Input); VisitExpression(expression.Predicate); VisitExpressionBindingPost(expression.Input); } /// is null /// Visitor pattern method for /// The DbProjectExpression that is being visited. ///. /// public override void Visit(DbProjectExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionBindingPre(expression.Input); VisitExpression(expression.Projection); VisitExpressionBindingPost(expression.Input); } /// is null /// Visitor pattern method for /// The DbCrossJoinExpression that is being visited. ///. /// public override void Visit(DbCrossJoinExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); foreach (DbExpressionBinding b in expression.Inputs) { VisitExpressionBindingPre(b); } foreach (DbExpressionBinding b in expression.Inputs) { VisitExpressionBindingPost(b); } } /// is null /// Visitor pattern method for /// The DbJoinExpression that is being visited. ///. /// public override void Visit(DbJoinExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionBindingPre(expression.Left); VisitExpressionBindingPre(expression.Right); VisitExpression(expression.JoinCondition); VisitExpressionBindingPost(expression.Left); VisitExpressionBindingPost(expression.Right); } /// is null /// Visitor pattern method for /// The DbApplyExpression that is being visited. ///. /// public override void Visit(DbApplyExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionBindingPre(expression.Input); // #433613: PreSharp warning 56506: Parameter 'expression.Apply' to this public method must be validated: A null-dereference can occur here. if (expression.Apply != null) { VisitExpression(expression.Apply.Expression); } VisitExpressionBindingPost(expression.Input); } /// is null /// Visitor pattern method for /// The DbExpression that is being visited. ///. /// public override void Visit(DbGroupByExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitGroupExpressionBindingPre(expression.Input); VisitExpressionList(expression.Keys); VisitGroupExpressionBindingMid(expression.Input); VisitAggregateList(expression.Aggregates); VisitGroupExpressionBindingPost(expression.Input); } /// is null /// Visitor pattern method for /// The DbSkipExpression that is being visited. ///. /// public override void Visit(DbSkipExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionBindingPre(expression.Input); foreach (DbSortClause sortKey in expression.SortOrder) { VisitExpression(sortKey.Expression); } VisitExpressionBindingPost(expression.Input); VisitExpression(expression.Count); } /// is null /// Visitor pattern method for /// The DbSortExpression that is being visited. ///. /// public override void Visit(DbSortExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionBindingPre(expression.Input); for(int idx = 0; idx < expression.SortOrder.Count; idx++) { VisitExpression(expression.SortOrder[idx].Expression); } VisitExpressionBindingPost(expression.Input); } /// is null /// Visitor pattern method for /// The DbQuantifierExpression that is being visited. ///. /// public override void Visit(DbQuantifierExpression expression) { // #433613: PreSharp warning 56506: Parameter 'expression' to this public method must be validated: A null-dereference can occur here. EntityUtil.CheckArgumentNull(expression, "expression"); VisitExpressionBindingPre(expression.Input); VisitExpression(expression.Predicate); VisitExpressionBindingPost(expression.Input); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. is null
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