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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / ELinq / EntityExpressionVisitor.cs / 1305376 / EntityExpressionVisitor.cs
using System; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Reflection; namespace System.Linq.Expressions { ////// Visitor for LINQ expression trees. /// internal abstract class EntityExpressionVisitor { internal const ExpressionType CustomExpression = (ExpressionType)(-1); internal EntityExpressionVisitor() { } internal virtual Expression Visit(Expression exp) { if (exp == null) return exp; switch (exp.NodeType) { case ExpressionType.UnaryPlus: case ExpressionType.Negate: case ExpressionType.NegateChecked: case ExpressionType.Not: case ExpressionType.Convert: case ExpressionType.ConvertChecked: case ExpressionType.ArrayLength: case ExpressionType.Quote: case ExpressionType.TypeAs: return this.VisitUnary((UnaryExpression)exp); case ExpressionType.Add: case ExpressionType.AddChecked: case ExpressionType.Subtract: case ExpressionType.SubtractChecked: case ExpressionType.Multiply: case ExpressionType.MultiplyChecked: case ExpressionType.Divide: case ExpressionType.Modulo: case ExpressionType.Power: case ExpressionType.And: case ExpressionType.AndAlso: case ExpressionType.Or: case ExpressionType.OrElse: case ExpressionType.LessThan: case ExpressionType.LessThanOrEqual: case ExpressionType.GreaterThan: case ExpressionType.GreaterThanOrEqual: case ExpressionType.Equal: case ExpressionType.NotEqual: case ExpressionType.Coalesce: case ExpressionType.ArrayIndex: case ExpressionType.RightShift: case ExpressionType.LeftShift: case ExpressionType.ExclusiveOr: return this.VisitBinary((BinaryExpression)exp); case ExpressionType.TypeIs: return this.VisitTypeIs((TypeBinaryExpression)exp); case ExpressionType.Conditional: return this.VisitConditional((ConditionalExpression)exp); case ExpressionType.Constant: return this.VisitConstant((ConstantExpression)exp); case ExpressionType.Parameter: return this.VisitParameter((ParameterExpression)exp); case ExpressionType.MemberAccess: return this.VisitMemberAccess((MemberExpression)exp); case ExpressionType.Call: return this.VisitMethodCall((MethodCallExpression)exp); case ExpressionType.Lambda: return this.VisitLambda((LambdaExpression)exp); case ExpressionType.New: return this.VisitNew((NewExpression)exp); case ExpressionType.NewArrayInit: case ExpressionType.NewArrayBounds: return this.VisitNewArray((NewArrayExpression)exp); case ExpressionType.Invoke: return this.VisitInvocation((InvocationExpression)exp); case ExpressionType.MemberInit: return this.VisitMemberInit((MemberInitExpression)exp); case ExpressionType.ListInit: return this.VisitListInit((ListInitExpression)exp); case EntityExpressionVisitor.CustomExpression: return this.VisitExtension(exp); default: throw Error.UnhandledExpressionType(exp.NodeType); } } internal virtual MemberBinding VisitBinding(MemberBinding binding) { switch (binding.BindingType) { case MemberBindingType.Assignment: return this.VisitMemberAssignment((MemberAssignment)binding); case MemberBindingType.MemberBinding: return this.VisitMemberMemberBinding((MemberMemberBinding)binding); case MemberBindingType.ListBinding: return this.VisitMemberListBinding((MemberListBinding)binding); default: throw Error.UnhandledBindingType(binding.BindingType); } } internal virtual ElementInit VisitElementInitializer(ElementInit initializer) { ReadOnlyCollectionarguments = this.VisitExpressionList(initializer.Arguments); if (arguments != initializer.Arguments) { return Expression.ElementInit(initializer.AddMethod, arguments); } return initializer; } internal virtual Expression VisitUnary(UnaryExpression u) { Expression operand = this.Visit(u.Operand); if (operand != u.Operand) { return Expression.MakeUnary(u.NodeType, operand, u.Type, u.Method); } return u; } internal virtual Expression VisitBinary(BinaryExpression b) { Expression left = this.Visit(b.Left); Expression right = this.Visit(b.Right); Expression conversion = this.Visit(b.Conversion); if (left != b.Left || right != b.Right || conversion != b.Conversion) { if (b.NodeType == ExpressionType.Coalesce && b.Conversion != null) return Expression.Coalesce(left, right, conversion as LambdaExpression); else return Expression.MakeBinary(b.NodeType, left, right, b.IsLiftedToNull, b.Method); } return b; } internal virtual Expression VisitTypeIs(TypeBinaryExpression b) { Expression expr = this.Visit(b.Expression); if (expr != b.Expression) { return Expression.TypeIs(expr, b.TypeOperand); } return b; } internal virtual Expression VisitConstant(ConstantExpression c) { return c; } internal virtual Expression VisitConditional(ConditionalExpression c) { Expression test = this.Visit(c.Test); Expression ifTrue = this.Visit(c.IfTrue); Expression ifFalse = this.Visit(c.IfFalse); if (test != c.Test || ifTrue != c.IfTrue || ifFalse != c.IfFalse) { return Expression.Condition(test, ifTrue, ifFalse); } return c; } internal virtual Expression VisitParameter(ParameterExpression p) { return p; } internal virtual Expression VisitMemberAccess(MemberExpression m) { Expression exp = this.Visit(m.Expression); if (exp != m.Expression) { return Expression.MakeMemberAccess(exp, m.Member); } return m; } internal virtual Expression VisitMethodCall(MethodCallExpression m) { Expression obj = this.Visit(m.Object); IEnumerable args = this.VisitExpressionList(m.Arguments); if (obj != m.Object || args != m.Arguments) { return Expression.Call(obj, m.Method, args); } return m; } internal virtual ReadOnlyCollection VisitExpressionList(ReadOnlyCollection original) { List list = null; for (int i = 0, n = original.Count; i < n; i++) { Expression p = this.Visit(original[i]); if (list != null) { list.Add(p); } else if (p != original[i]) { list = new List (n); for (int j = 0; j < i; j++) { list.Add(original[j]); } list.Add(p); } } if (list != null) return list.ToReadOnlyCollection(); return original; } internal virtual MemberAssignment VisitMemberAssignment(MemberAssignment assignment) { Expression e = this.Visit(assignment.Expression); if (e != assignment.Expression) { return Expression.Bind(assignment.Member, e); } return assignment; } internal virtual MemberMemberBinding VisitMemberMemberBinding(MemberMemberBinding binding) { IEnumerable bindings = this.VisitBindingList(binding.Bindings); if (bindings != binding.Bindings) { return Expression.MemberBind(binding.Member, bindings); } return binding; } internal virtual MemberListBinding VisitMemberListBinding(MemberListBinding binding) { IEnumerable initializers = this.VisitElementInitializerList(binding.Initializers); if (initializers != binding.Initializers) { return Expression.ListBind(binding.Member, initializers); } return binding; } internal virtual IEnumerable VisitBindingList(ReadOnlyCollection original) { List list = null; for (int i = 0, n = original.Count; i < n; i++) { MemberBinding b = this.VisitBinding(original[i]); if (list != null) { list.Add(b); } else if (b != original[i]) { list = new List (n); for (int j = 0; j < i; j++) { list.Add(original[j]); } list.Add(b); } } if (list != null) return list; return original; } internal virtual IEnumerable VisitElementInitializerList(ReadOnlyCollection original) { List list = null; for (int i = 0, n = original.Count; i < n; i++) { ElementInit init = this.VisitElementInitializer(original[i]); if (list != null) { list.Add(init); } else if (init != original[i]) { list = new List (n); for (int j = 0; j < i; j++) { list.Add(original[j]); } list.Add(init); } } if (list != null) return list; return original; } internal virtual Expression VisitLambda(LambdaExpression lambda) { Expression body = this.Visit(lambda.Body); if (body != lambda.Body) { return Expression.Lambda(lambda.Type, body, lambda.Parameters); } return lambda; } internal virtual NewExpression VisitNew(NewExpression nex) { IEnumerable args = this.VisitExpressionList(nex.Arguments); if (args != nex.Arguments) { if (nex.Members != null) return Expression.New(nex.Constructor, args, nex.Members); else return Expression.New(nex.Constructor, args); } return nex; } internal virtual Expression VisitMemberInit(MemberInitExpression init) { NewExpression n = this.VisitNew(init.NewExpression); IEnumerable bindings = this.VisitBindingList(init.Bindings); if (n != init.NewExpression || bindings != init.Bindings) { return Expression.MemberInit(n, bindings); } return init; } internal virtual Expression VisitListInit(ListInitExpression init) { NewExpression n = this.VisitNew(init.NewExpression); IEnumerable initializers = this.VisitElementInitializerList(init.Initializers); if (n != init.NewExpression || initializers != init.Initializers) { return Expression.ListInit(n, initializers); } return init; } internal virtual Expression VisitNewArray(NewArrayExpression na) { IEnumerable exprs = this.VisitExpressionList(na.Expressions); if (exprs != na.Expressions) { if (na.NodeType == ExpressionType.NewArrayInit) { return Expression.NewArrayInit(na.Type.GetElementType(), exprs); } else { return Expression.NewArrayBounds(na.Type.GetElementType(), exprs); } } return na; } internal virtual Expression VisitInvocation(InvocationExpression iv) { IEnumerable args = this.VisitExpressionList(iv.Arguments); Expression expr = this.Visit(iv.Expression); if (args != iv.Arguments || expr != iv.Expression) { return Expression.Invoke(expr, args); } return iv; } internal virtual Expression VisitExtension(Expression ext) { return ext; } internal static Expression Visit(Expression exp, Func , Expression> visit) { BasicExpressionVisitor basicVisitor = new BasicExpressionVisitor(visit); return basicVisitor.Visit(exp); } private sealed class BasicExpressionVisitor : EntityExpressionVisitor { private readonly Func , Expression> _visit; internal BasicExpressionVisitor(Func , Expression> visit) { _visit = visit ?? ((exp, baseVisit) => baseVisit(exp)); } internal override Expression Visit(Expression exp) { return _visit(exp, base.Visit); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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