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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Common / Utils / Boolean / Literal.cs / 1305376 / Literal.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections.Generic; using System.Text; using System.Globalization; using System.Collections.ObjectModel; using System.Diagnostics; namespace System.Data.Common.Utils.Boolean { ////// Represents a literal in a normal form expression of the form: /// /// Term /// /// or /// /// !Term /// ///internal sealed class Literal : NormalFormNode , IEquatable > { private readonly TermExpr _term; private readonly bool _isTermPositive; /// /// Initialize a new literal. /// /// Term /// Sign of term internal Literal(TermExprterm, bool isTermPositive) : base(isTermPositive ? (BoolExpr )term : (BoolExpr )new NotExpr (term)) { Debug.Assert(null != term); _term = term; _isTermPositive = isTermPositive; } /// /// Gets literal term. /// internal TermExprTerm { get { return _term; } } /// /// Gets sign of term. /// internal bool IsTermPositive { get { return _isTermPositive; } } ////// Creates a negated version of this literal. /// ///!this internal LiteralMakeNegated() { return IdentifierService .Instance.NegateLiteral(this); } public override string ToString() { return StringUtil.FormatInvariant("{0}{1}", _isTermPositive ? String.Empty : "!", _term); } public override bool Equals(object obj) { Debug.Fail("use typed Equals"); return Equals(obj as Literal ); } public bool Equals(Literal other) { return null != other && other._isTermPositive == _isTermPositive && other._term.Equals(_term); } public override int GetHashCode() { return _term.GetHashCode(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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