DotExpr.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / EntitySql / AST / DotExpr.cs / 1305376 / DotExpr.cs
                        

                        
                            //---------------------------------------------------------------------- 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// 
// @owner  [....]
// @backupOwner [....] 
//--------------------------------------------------------------------- 

namespace System.Data.Common.EntitySql.AST 
{
    using System;
    using System.Globalization;
    using System.Collections; 
    using System.Collections.Generic;
    using System.Diagnostics; 
 
    /// 
    /// Represents dotExpr: expr.Identifier 
    /// 
    internal sealed class DotExpr : Node
    {
        private readonly Node _leftExpr; 
        private readonly Identifier _identifier;
        private bool? _isMultipartIdentifierComputed; 
        private string[] _names; 

        ///  
        /// initializes
        /// 
        internal DotExpr(Node leftExpr, Identifier id)
        { 
            _leftExpr = leftExpr;
            _identifier = id; 
        } 

        ///  
        /// For the following expression: "a.b.c.d", Left returns "a.b.c".
        /// 
        internal Node Left
        { 
            get { return _leftExpr; }
        } 
 
        /// 
        /// For the following expression: "a.b.c.d", Identifier returns "d". 
        /// 
        internal Identifier Identifier
        {
            get { return _identifier; } 
        }
 
        ///  
        /// Returns true if all parts of this expression are identifiers like in "a.b.c",
        /// false for expressions like "FunctionCall().a.b.c". 
        /// 
        internal bool IsMultipartIdentifier(out string[] names)
        {
            if (_isMultipartIdentifierComputed.HasValue) 
            {
                names = _names; 
                return _isMultipartIdentifierComputed.Value; 
            }
 
            _names = null;
            Identifier leftIdenitifier = _leftExpr as Identifier;
            if (leftIdenitifier != null)
            { 
                _names = new string[] { leftIdenitifier.Name, _identifier.Name };
            } 
 
            DotExpr leftDotExpr = _leftExpr as DotExpr;
            string[] leftNames; 
            if (leftDotExpr != null && leftDotExpr.IsMultipartIdentifier(out leftNames))
            {
                _names = new string[leftNames.Length + 1];
                leftNames.CopyTo(_names, 0); 
                _names[_names.Length - 1] = _identifier.Name;
            } 
 
            Debug.Assert(_names == null || _names.Length > 0, "_names must be null or non-empty");
 
            _isMultipartIdentifierComputed = _names != null;
            names = _names;
            return _isMultipartIdentifierComputed.Value;
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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