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Viewing changes to contrib/ICSharpCode.NRefactory/TypeSystem/NullableType.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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contrib/ICSharpCode.NRefactory/TypeSystem/NullableType.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the 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 in all copies or
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// 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 IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING 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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using System;
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using ICSharpCode.NRefactory.TypeSystem.Implementation;
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namespace ICSharpCode.NRefactory.TypeSystem
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{
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        /// <summary>
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        /// Static helper methods for working with nullable types.
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        /// </summary>
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        public static class NullableType
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        {
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                /// <summary>
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                /// Gets whether the specified type is a nullable type.
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                /// </summary>
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                public static bool IsNullable(IType type)
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                {
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                        if (type == null)
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                                throw new ArgumentNullException("type");
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                        ParameterizedType pt = type as ParameterizedType;
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                        return pt != null && pt.TypeParameterCount == 1 && pt.GetDefinition().KnownTypeCode == KnownTypeCode.NullableOfT;
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                }
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                public static bool IsNonNullableValueType(IType type)
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                {
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                        return type.IsReferenceType == false && !IsNullable(type);
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                }
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                /// <summary>
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                /// Returns the element type, if <paramref name="type"/> is a nullable type.
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                /// Otherwise, returns the type itself.
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                /// </summary>
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                public static IType GetUnderlyingType(IType type)
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                {
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                        if (type == null)
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                                throw new ArgumentNullException("type");
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                        ParameterizedType pt = type as ParameterizedType;
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                        if (pt != null && pt.TypeParameterCount == 1 && pt.FullName == "System.Nullable")
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                                return pt.GetTypeArgument(0);
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                        else
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                                return type;
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                }
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                /// <summary>
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                /// Creates a nullable type.
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                /// </summary>
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                public static IType Create(ICompilation compilation, IType elementType)
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                {
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                        if (compilation == null)
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                                throw new ArgumentNullException("compilation");
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                        if (elementType == null)
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                                throw new ArgumentNullException("elementType");
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                        IType nullableType = compilation.FindType(KnownTypeCode.NullableOfT);
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                        ITypeDefinition nullableTypeDef = nullableType.GetDefinition();
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                        if (nullableTypeDef != null)
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                                return new ParameterizedType(nullableTypeDef, new [] { elementType });
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                        else
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                                return nullableType;
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                }
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                /// <summary>
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                /// Creates a nullable type reference.
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                /// </summary>
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                public static ITypeReference Create(ITypeReference elementType)
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                {
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                        if (elementType == null)
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                                throw new ArgumentNullException("elementType");
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                        return new ParameterizedTypeReference(KnownTypeReference.NullableOfT, new [] { elementType });
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                }
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        }
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}