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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.Globalization;
using ICSharpCode.NRefactory.Utils;
namespace ICSharpCode.NRefactory.TypeSystem.Implementation
{
[Serializable]
public sealed class TypeParameterReference : ITypeReference, ISymbolReference
{
static readonly TypeParameterReference[] classTypeParameterReferences = new TypeParameterReference[8];
static readonly TypeParameterReference[] methodTypeParameterReferences = new TypeParameterReference[8];
/// <summary>
/// Creates a type parameter reference.
/// For common type parameter references, this method may return a shared instance.
/// </summary>
public static TypeParameterReference Create(SymbolKind ownerType, int index)
{
if (index >= 0 && index < 8 && (ownerType == SymbolKind.TypeDefinition || ownerType == SymbolKind.Method)) {
TypeParameterReference[] arr = (ownerType == SymbolKind.TypeDefinition) ? classTypeParameterReferences : methodTypeParameterReferences;
TypeParameterReference result = LazyInit.VolatileRead(ref arr[index]);
if (result == null) {
result = LazyInit.GetOrSet(ref arr[index], new TypeParameterReference(ownerType, index));
}
return result;
} else {
return new TypeParameterReference(ownerType, index);
}
}
readonly SymbolKind ownerType;
readonly int index;
public SymbolKind OwnerType {
get {
return ownerType;
}
}
public int Index {
get {
return index;
}
}
public TypeParameterReference(SymbolKind ownerType, int index)
{
this.ownerType = ownerType;
this.index = index;
}
public IType Resolve(ITypeResolveContext context)
{
if (ownerType == SymbolKind.Method) {
IMethod method = context.CurrentMember as IMethod;
if (method != null && index < method.TypeParameters.Count) {
return method.TypeParameters[index];
}
return DummyTypeParameter.GetMethodTypeParameter(index);
} else if (ownerType == SymbolKind.TypeDefinition) {
ITypeDefinition typeDef = context.CurrentTypeDefinition;
if (typeDef != null && index < typeDef.TypeParameters.Count) {
return typeDef.TypeParameters[index];
}
return DummyTypeParameter.GetClassTypeParameter(index);
} else {
return SpecialType.UnknownType;
}
}
ISymbol ISymbolReference.Resolve(ITypeResolveContext context)
{
return Resolve(context) as ISymbol;
}
public override string ToString()
{
if (ownerType == SymbolKind.Method)
return "!!" + index.ToString(CultureInfo.InvariantCulture);
else
return "!" + index.ToString(CultureInfo.InvariantCulture);
}
}
}
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