source: tags/3.3.11/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory.CSharp-5.5.0/TypeSystem/AliasNamespaceReference.cs @ 12011

// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
// 
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// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
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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>
  /// Looks up an alias (identifier in front of :: operator).
  /// </summary>
  /// <remarks>
  /// The member lookup performed by the :: operator is handled
  /// by <see cref="MemberTypeOrNamespaceReference"/>.
  /// </remarks>
  [Serializable]
  public sealed class AliasNamespaceReference : TypeOrNamespaceReference, ISupportsInterning
  {
    readonly string identifier;
    
    public AliasNamespaceReference(string identifier)
    {
      if (identifier == null)
        throw new ArgumentNullException("identifier");
      this.identifier = identifier;
    }
    
    public string Identifier {
      get { return identifier; }
    }
    
    public override ResolveResult Resolve(CSharpResolver resolver)
    {
      return resolver.ResolveAlias(identifier);
    }
    
    public override IType ResolveType(CSharpResolver resolver)
    {
      // alias cannot refer to types
      return SpecialType.UnknownType;
    }
    
    public override string ToString()
    {
      return identifier + "::";
    }
    
    int ISupportsInterning.GetHashCodeForInterning()
    {
      return identifier.GetHashCode();
    }
    
    bool ISupportsInterning.EqualsForInterning(ISupportsInterning other)
    {
      AliasNamespaceReference anr = other as AliasNamespaceReference;
      return anr != null && this.identifier == anr.identifier;
    }
  }
}