121 lines
4.8 KiB
C#
121 lines
4.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Data.Linq;
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using System.Data.Linq.Mapping;
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using System.Data.Linq.Provider;
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using System.Linq;
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using System.Data.Linq.SqlClient;
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using System.Diagnostics.CodeAnalysis;
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namespace System.Data.Linq.SqlClient {
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/// <summary>
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/// Determines whether an expression is simple or not.
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/// Simple is a scalar expression that contains only functions, operators and column references
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/// </summary>
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internal static class SimpleExpression {
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internal static bool IsSimple(SqlExpression expr) {
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Visitor v = new Visitor();
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v.Visit(expr);
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return v.IsSimple;
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}
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class Visitor : SqlVisitor {
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bool isSimple = true;
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internal bool IsSimple {
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get { return this.isSimple; }
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}
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[SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification = "These issues are related to our use of if-then and case statements for node types, which adds to the complexity count however when reviewed they are easy to navigate and understand.")]
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internal override SqlNode Visit(SqlNode node) {
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if (node == null) {
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return null;
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}
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if (!this.isSimple) {
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return node;
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}
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switch (node.NodeType) {
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case SqlNodeType.Not:
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case SqlNodeType.Not2V:
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case SqlNodeType.Negate:
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case SqlNodeType.BitNot:
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case SqlNodeType.IsNull:
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case SqlNodeType.IsNotNull:
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case SqlNodeType.ValueOf:
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case SqlNodeType.OuterJoinedValue:
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case SqlNodeType.ClrLength:
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case SqlNodeType.Add:
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case SqlNodeType.Sub:
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case SqlNodeType.Mul:
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case SqlNodeType.Div:
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case SqlNodeType.Mod:
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case SqlNodeType.BitAnd:
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case SqlNodeType.BitOr:
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case SqlNodeType.BitXor:
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case SqlNodeType.And:
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case SqlNodeType.Or:
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case SqlNodeType.GE:
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case SqlNodeType.GT:
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case SqlNodeType.LE:
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case SqlNodeType.LT:
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case SqlNodeType.EQ:
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case SqlNodeType.NE:
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case SqlNodeType.EQ2V:
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case SqlNodeType.NE2V:
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case SqlNodeType.Between:
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case SqlNodeType.Concat:
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case SqlNodeType.Convert:
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case SqlNodeType.Treat:
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case SqlNodeType.Member:
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case SqlNodeType.TypeCase:
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case SqlNodeType.SearchedCase:
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case SqlNodeType.SimpleCase:
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case SqlNodeType.Like:
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case SqlNodeType.FunctionCall:
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case SqlNodeType.ExprSet:
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case SqlNodeType.OptionalValue:
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case SqlNodeType.Parameter:
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case SqlNodeType.ColumnRef:
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case SqlNodeType.Value:
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case SqlNodeType.Variable:
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return base.Visit(node);
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case SqlNodeType.Column:
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case SqlNodeType.ClientCase:
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case SqlNodeType.DiscriminatedType:
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case SqlNodeType.Link:
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case SqlNodeType.Row:
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case SqlNodeType.UserQuery:
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case SqlNodeType.StoredProcedureCall:
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case SqlNodeType.UserRow:
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case SqlNodeType.UserColumn:
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case SqlNodeType.Multiset:
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case SqlNodeType.ScalarSubSelect:
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case SqlNodeType.Element:
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case SqlNodeType.Exists:
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case SqlNodeType.Join:
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case SqlNodeType.Select:
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case SqlNodeType.New:
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case SqlNodeType.ClientQuery:
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case SqlNodeType.ClientArray:
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case SqlNodeType.Insert:
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case SqlNodeType.Update:
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case SqlNodeType.Delete:
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case SqlNodeType.MemberAssign:
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case SqlNodeType.Assign:
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case SqlNodeType.Block:
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case SqlNodeType.Union:
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case SqlNodeType.DoNotVisit:
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case SqlNodeType.MethodCall:
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case SqlNodeType.Nop:
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default:
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this.isSimple = false;
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return node;
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}
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}
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}
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}
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}
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