source: stable/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/TypeSystem/Implementation/KnownTypeCache.cs @ 11937

// 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 ICSharpCode.NRefactory.Utils;

namespace ICSharpCode.NRefactory.TypeSystem.Implementation
{
  /// <summary>
  /// Cache for KnownTypeReferences.
  /// </summary>
  sealed class KnownTypeCache
  {
    readonly ICompilation compilation;
    readonly IType[] knownTypes = new IType[KnownTypeReference.KnownTypeCodeCount];
    
    public KnownTypeCache(ICompilation compilation)
    {
      this.compilation = compilation;
    }
    
    public IType FindType(KnownTypeCode typeCode)
    {
      IType type = LazyInit.VolatileRead(ref knownTypes[(int)typeCode]);
      if (type != null) {
        return type;
      }
      return LazyInit.GetOrSet(ref knownTypes[(int)typeCode], SearchType(typeCode));
    }
    
    IType SearchType(KnownTypeCode typeCode)
    {
      KnownTypeReference typeRef = KnownTypeReference.Get(typeCode);
      if (typeRef == null)
        return SpecialType.UnknownType;
      var typeName = new TopLevelTypeName(typeRef.Namespace, typeRef.Name, typeRef.TypeParameterCount);
      foreach (IAssembly asm in compilation.Assemblies) {
        var typeDef = asm.GetTypeDefinition(typeName);
        if (typeDef != null)
          return typeDef;
      }
      return new UnknownType(typeName);
    }
  }
}