source: branches/CodeEditor/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/TypeSystem/TypeOrNamespaceReference.cs @ 11700

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// 
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// to whom the Software is furnished to do so, subject to the following conditions:
// 
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// substantial portions of the Software.
// 
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// 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
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using System;
using ICSharpCode.NRefactory.CSharp.Resolver;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;

namespace ICSharpCode.NRefactory.CSharp.TypeSystem
{
  /// <summary>
  /// Represents a reference which could point to a type or namespace.
  /// </summary>
  [Serializable]
  public abstract class TypeOrNamespaceReference : ITypeReference
  {
    /// <summary>
    /// Resolves the reference and returns the ResolveResult.
    /// </summary>
    public abstract ResolveResult Resolve(CSharpResolver resolver);
    
    /// <summary>
    /// Returns the type that is referenced; or an <c>UnknownType</c> if the type isn't found.
    /// </summary>
    public abstract IType ResolveType(CSharpResolver resolver);
    
    /// <summary>
    /// Returns the namespace that is referenced; or null if no such namespace is found.
    /// </summary>
    public INamespace ResolveNamespace(CSharpResolver resolver)
    {
      NamespaceResolveResult nrr = Resolve(resolver) as NamespaceResolveResult;
      return nrr != null ? nrr.Namespace : null;
    }
    
    IType ITypeReference.Resolve(ITypeResolveContext context)
    {
      // Strictly speaking, we might have to resolve the type in a nested compilation, similar
      // to what we're doing with ConstantExpression.
      // However, in almost all cases this will work correctly - if the resulting type is only available in the
      // nested compilation and not in this, we wouldn't be able to map it anyways.
      var ctx = context as CSharpTypeResolveContext;
      if (ctx == null) {
        ctx = new CSharpTypeResolveContext(context.CurrentAssembly ?? context.Compilation.MainAssembly, null, context.CurrentTypeDefinition, context.CurrentMember);
      }
      return ResolveType(new CSharpResolver(ctx));
      
      // A potential issue might be this scenario:
      
      // Assembly 1:
      //  class A { public class Nested {} }
      
      // Assembly 2: (references asm 1)
      //  class B : A {}
      
      // Assembly 3: (references asm 1 and 2)
      //  class C { public B.Nested Field; }
      
      // Assembly 4: (references asm 1 and 3, but not 2):
      //  uses C.Field;
      
      // Here we would not be able to resolve 'B.Nested' in the compilation of assembly 4, as type B is missing there.
    }
  }
}