mcs/class/referencesource/System.Data.Entity/System/Data/Common/EntitySql/AST/MethodExpr.cs

   1 //---------------------------------------------------------------------
   2 // <copyright file="MethodExpr.cs" company="Microsoft">
   3 //      Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 //
   6 // @owner  Microsoft
   7 // @backupOwner Microsoft
   8 //---------------------------------------------------------------------
   9
  10 namespace System.Data.Common.EntitySql.AST
  11 {
  12     using System;
  13     using System.Globalization;
  14     using System.Collections;
  15     using System.Collections.Generic;
  16     using System.Data.Common.CommandTrees;
  17     using System.Diagnostics;
  18
  19     /// <summary>
  20     /// Represents invocation expression: expr(...)
  21     /// </summary>
  22     internal sealed class MethodExpr : GroupAggregateExpr
  23     {
  24         private readonly Node _expr;
  25         private readonly NodeList<Node> _args;
  26         private readonly NodeList<RelshipNavigationExpr> _relationships;
  27
  28         /// <summary>
  29         /// Initializes method ast node.
  30         /// </summary>
  31         internal MethodExpr(Node expr,
  32                             DistinctKind distinctKind,
  33                             NodeList<Node> args) : this (expr, distinctKind, args, null)
  34         { }
  35
  36         /// <summary>
  37         /// Intializes a method ast node with relationships.
  38         /// </summary>
  39         internal MethodExpr(Node expr,
  40                             DistinctKind distinctKind,
  41                             NodeList<Node> args,
  42                             NodeList<RelshipNavigationExpr> relationships) : base(distinctKind)
  43         {
  44             Debug.Assert(expr != null, "expr != null");
  45             Debug.Assert(args == null || args.Count > 0, "args must be null or a non-empty list");
  46
  47             _expr = expr;
  48             _args = args;
  49             _relationships = relationships;
  50         }
  51
  52         /// <summary>
  53         /// For the following expression: "a.b.c.Foo()", returns "a.b.c.Foo".
  54         /// </summary>
  55         internal Node Expr
  56         {
  57             get { return _expr; }
  58         }
  59
  60         /// <summary>
  61         /// Argument list.
  62         /// </summary>
  63         internal NodeList<Node> Args
  64         {
  65             get { return _args; }
  66         }
  67
  68         /// <summary>
  69         /// True if there are associated relationship expressions.
  70         /// </summary>
  71         internal bool HasRelationships
  72         {
  73             get { return null != _relationships && _relationships.Count > 0; }
  74         }
  75
  76         /// <summary>
  77         /// Optional relationship list.
  78         /// </summary>
  79         internal NodeList<RelshipNavigationExpr> Relationships
  80         {
  81             get { return _relationships; }
  82         }
  83     }
  84 }