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// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Runtime.CompilerServices;
using ICSharpCode.NRefactory.Utils;
namespace ICSharpCode.NRefactory.TypeSystem.Implementation
{
sealed class NonFrozenInterningProvider : InterningProvider
{
sealed class InterningComparer : IEqualityComparer<ISupportsInterning>
{
public bool Equals(ISupportsInterning x, ISupportsInterning y)
{
return x.EqualsForInterning(y);
}
public int GetHashCode(ISupportsInterning obj)
{
return obj.GetHashCodeForInterning();
}
}
sealed class ListComparer : IEqualityComparer<IEnumerable>
{
public bool Equals(IEnumerable a, IEnumerable b)
{
if (a.GetType() != b.GetType())
return false;
IEnumerator e1 = a.GetEnumerator();
IEnumerator e2 = b.GetEnumerator();
while (e1.MoveNext()) {
// e1 has more elements than e2; or elements are different
if (!e2.MoveNext() || e1.Current != e2.Current)
return false;
}
if (e2.MoveNext()) // e2 has more elements than e1
return false;
// No need to dispose e1/e2: non-generic IEnumerator doesn't implement IDisposable,
// and the underlying enumerator will likely be a List<T>.Enumerator which has an empty Dispose() method.
return true;
}
public int GetHashCode(IEnumerable obj)
{
int hashCode = obj.GetType().GetHashCode();
unchecked {
foreach (object o in obj) {
hashCode *= 27;
hashCode += RuntimeHelpers.GetHashCode(o);
}
}
return hashCode;
}
}
Dictionary<object, object> byValueDict = new Dictionary<object, object>();
Dictionary<ISupportsInterning, ISupportsInterning> supportsInternDict = new Dictionary<ISupportsInterning, ISupportsInterning>(new InterningComparer());
Dictionary<IEnumerable, IEnumerable> listDict = new Dictionary<IEnumerable, IEnumerable>(new ListComparer());
public override ISupportsInterning Intern(ISupportsInterning obj)
{
if (obj == null)
return null;
ISupportsInterning output;
if (supportsInternDict.TryGetValue(obj, out output)) {
return output;
} else {
supportsInternDict.Add(obj, obj);
return obj;
}
}
public override string Intern(string text)
{
if (text == null)
return null;
object output;
if (byValueDict.TryGetValue(text, out output))
return (string)output;
else
return text;
}
public override object InternValue(object obj)
{
if (obj == null)
return null;
object output;
if (byValueDict.TryGetValue(obj, out output))
return output;
else
return obj;
}
public override IList<T> InternList<T>(IList<T> list)
{
if (list == null)
return null;
if (list.Count == 0)
return EmptyList<T>.Instance;
if (!list.IsReadOnly)
list = new ReadOnlyCollection<T>(list);
IEnumerable output;
if (listDict.TryGetValue(list, out output))
list = (IList<T>)output;
else
listDict.Add(list, list);
return list;
}
}
}
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