source: tags/3.3.13/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/TypeSystem/Implementation/NestedTypeReference.cs @ 18242

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// 
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// 
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using System;

namespace ICSharpCode.NRefactory.TypeSystem.Implementation
{
  /// <summary>
  /// Type reference used to reference nested types.
  /// </summary>
  [Serializable]
  public sealed class NestedTypeReference : ITypeReference, ISymbolReference, ISupportsInterning
  {
    readonly ITypeReference declaringTypeRef;
    readonly string name;
    readonly int additionalTypeParameterCount;
    
    /// <summary>
    /// Creates a new NestedTypeReference.
    /// </summary>
    /// <param name="declaringTypeRef">Reference to the declaring type.</param>
    /// <param name="name">Name of the nested class</param>
    /// <param name="additionalTypeParameterCount">Number of type parameters on the inner class (without type parameters on baseTypeRef)</param>
    /// <remarks>
    /// <paramref name="declaringTypeRef"/> must be exactly the (unbound) declaring type, not a derived type, not a parameterized type.
    /// NestedTypeReference thus always resolves to a type definition, never to (partially) parameterized types.
    /// </remarks>
    public NestedTypeReference(ITypeReference declaringTypeRef, string name, int additionalTypeParameterCount)
    {
      if (declaringTypeRef == null)
        throw new ArgumentNullException("declaringTypeRef");
      if (name == null)
        throw new ArgumentNullException("name");
      this.declaringTypeRef = declaringTypeRef;
      this.name = name;
      this.additionalTypeParameterCount = additionalTypeParameterCount;
    }
    
    public ITypeReference DeclaringTypeReference {
      get { return declaringTypeRef; }
    }
    
    public string Name {
      get { return name; }
    }
    
    public int AdditionalTypeParameterCount {
      get { return additionalTypeParameterCount; }
    }
    
    public IType Resolve(ITypeResolveContext context)
    {
      ITypeDefinition declaringType = declaringTypeRef.Resolve(context) as ITypeDefinition;
      if (declaringType != null) {
        int tpc = declaringType.TypeParameterCount;
        foreach (IType type in declaringType.NestedTypes) {
          if (type.Name == name && type.TypeParameterCount == tpc + additionalTypeParameterCount)
            return type;
        }
      }
      return new UnknownType(null, name, additionalTypeParameterCount);
    }
    
    ISymbol ISymbolReference.Resolve(ITypeResolveContext context)
    {
      var type = Resolve(context);
      if (type is ITypeDefinition)
        return (ISymbol)type;
      return null;
    }
    
    public override string ToString()
    {
      if (additionalTypeParameterCount == 0)
        return declaringTypeRef + "+" + name;
      else
        return declaringTypeRef + "+" + name + "`" + additionalTypeParameterCount;
    }
    
    int ISupportsInterning.GetHashCodeForInterning()
    {
      return declaringTypeRef.GetHashCode() ^ name.GetHashCode() ^ additionalTypeParameterCount;
    }
    
    bool ISupportsInterning.EqualsForInterning(ISupportsInterning other)
    {
      NestedTypeReference o = other as NestedTypeReference;
      return o != null && declaringTypeRef == o.declaringTypeRef && name == o.name && additionalTypeParameterCount == o.additionalTypeParameterCount;
    }
  }
}