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Viewing changes to contrib/ICSharpCode.NRefactory/TypeSystem/Implementation/AbstractFreezable.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/Implementation/AbstractFreezable.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 System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Linq;
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namespace ICSharpCode.NRefactory.TypeSystem.Implementation
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{
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        public static class FreezableHelper
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        {
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                public static void ThrowIfFrozen(IFreezable freezable)
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                {
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                        if (freezable.IsFrozen)
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                                throw new InvalidOperationException("Cannot mutate frozen " + freezable.GetType().Name);
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                }
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                public static IList<T> FreezeListAndElements<T>(IList<T> list)
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                {
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                        if (list != null) {
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                                foreach (T item in list)
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                                        Freeze(item);
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                        }
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                        return FreezeList(list);
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                }
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                public static IList<T> FreezeList<T>(IList<T> list)
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                {
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                        if (list == null || list.Count == 0)
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                                return EmptyList<T>.Instance;
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                        if (list.IsReadOnly) {
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                                // If the list is already read-only, return it directly.
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                                // This is important, otherwise we might undo the effects of interning.
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                                return list;
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                        } else {
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                                return new ReadOnlyCollection<T>(list.ToArray());
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                        }
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                }
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                public static void Freeze(object item)
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                {
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                        IFreezable f = item as IFreezable;
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                        if (f != null)
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                                f.Freeze();
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                }
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        }
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        [Serializable]
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        public abstract class AbstractFreezable : IFreezable
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        {
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                bool isFrozen;
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                /// <summary>
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                /// Gets if this instance is frozen. Frozen instances are immutable and thus thread-safe.
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                /// </summary>
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                public bool IsFrozen {
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                        get { return isFrozen; }
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                }
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                /// <summary>
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                /// Freezes this instance.
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                /// </summary>
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                public void Freeze()
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                {
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                        if (!isFrozen) {
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                                FreezeInternal();
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                                isFrozen = true;
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                        }
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                }
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                protected virtual void FreezeInternal()
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                {
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                }
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                /*
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                protected static IList<T> CopyList<T>(IList<T> inputList)
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                {
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                        if (inputList == null || inputList.Count == 0)
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                                return null;
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                        else
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                                return new List<T>(inputList);
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                }*/
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        }
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}