117 lines
3.4 KiB
C#
117 lines
3.4 KiB
C#
#region MigraDoc - Creating Documents on the Fly
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//
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// Authors:
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// Stefan Lange
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// Klaus Potzesny
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// David Stephensen
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//
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// Copyright (c) 2001-2017 empira Software GmbH, Cologne Area (Germany)
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//
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// http://www.pdfsharp.com
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// http://www.migradoc.com
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// http://sourceforge.net/projects/pdfsharp
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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namespace MigraDoc.DocumentObjectModel.publics
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{
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/// <summary>
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/// Represents a nullable string value.
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/// </summary>
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public struct NString : INullableValue
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{
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/// <summary>
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/// Gets or sets the value of the instance.
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/// </summary>
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public string Value
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{
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get { return _value ?? String.Empty; }
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set { _value = value; }
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}
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/// <summary>
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/// Returns the value of the instance.
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/// </summary>
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object INullableValue.GetValue()
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{
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return Value;
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}
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/// <summary>
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/// Sets the value of the instance.
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/// </summary>
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void INullableValue.SetValue(object value)
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{
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_value = (String)value;
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}
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/// <summary>
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/// Resets this instance,
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/// i.e. IsNull() will return true afterwards.
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/// </summary>
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public void SetNull()
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{
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_value = null;
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}
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/// <summary>
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/// Determines whether this instance is null (not set).
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/// </summary>
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public bool IsNull
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{
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get { return _value == null; }
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}
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/// <summary>
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/// Returns a value indicating whether this instance is equal to the specified object.
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/// </summary>
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public override bool Equals(object value)
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{
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if (value is NString)
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return this == (NString)value;
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return false;
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}
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public override int GetHashCode()
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{
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return _value == null ? 0 : _value.GetHashCode();
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}
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public static bool operator ==(NString l, NString r)
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{
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if (l.IsNull)
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return r.IsNull;
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if (r.IsNull)
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return false;
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return l.Value == r.Value;
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}
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public static bool operator !=(NString l, NString r)
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{
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return !(l == r);
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}
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public static readonly NString NullValue = new NString();
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string _value;
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}
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} |