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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