source: branches/CodeEditor/HeuristicLab.ExtLibs/HeuristicLab.NRefactory/5.5.0/NRefactory-5.5.0/TypeSystem/Implementation/DefaultUnresolvedTypeParameter.cs @ 11700

// 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
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// 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
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// DEALINGS IN THE SOFTWARE.

using System;
using System.Collections.Generic;
using System.Globalization;

using ICSharpCode.NRefactory.Utils;

namespace ICSharpCode.NRefactory.TypeSystem.Implementation
{
  /// <summary>
  /// Default implementation of <see cref="IUnresolvedTypeParameter"/>.
  /// </summary>
  [Serializable]
  public class DefaultUnresolvedTypeParameter : IUnresolvedTypeParameter, IFreezable
  {
    readonly int index;
    IList<IUnresolvedAttribute> attributes;
    IList<ITypeReference> constraints;
    string name;
    DomRegion region;
    
    SymbolKind ownerType;
    VarianceModifier variance;
    BitVector16 flags;
    const ushort FlagFrozen                       = 0x0001;
    const ushort FlagReferenceTypeConstraint      = 0x0002;
    const ushort FlagValueTypeConstraint          = 0x0004;
    const ushort FlagDefaultConstructorConstraint = 0x0008;
    
    public void Freeze()
    {
      if (!flags[FlagFrozen]) {
        FreezeInternal();
        flags[FlagFrozen] = true;
      }
    }
    
    protected virtual void FreezeInternal()
    {
      attributes = FreezableHelper.FreezeListAndElements(attributes);
      constraints = FreezableHelper.FreezeList(constraints);
    }
    
    public DefaultUnresolvedTypeParameter(SymbolKind ownerType, int index, string name = null)
    {
      this.ownerType = ownerType;
      this.index = index;
      this.name = name ?? ((ownerType == SymbolKind.Method ? "!!" : "!") + index.ToString(CultureInfo.InvariantCulture));
    }
    
    public SymbolKind OwnerType {
      get { return ownerType; }
    }
    
    public int Index {
      get { return index; }
    }
    
    public bool IsFrozen {
      get { return flags[FlagFrozen]; }
    }
    
    public string Name {
      get { return name; }
      set {
        FreezableHelper.ThrowIfFrozen(this);
        name = value;
      }
    }
    
    string INamedElement.FullName {
      get { return name; }
    }
    
    string INamedElement.Namespace {
      get { return string.Empty; }
    }
    
    string INamedElement.ReflectionName {
      get {
        if (ownerType == SymbolKind.Method)
          return "``" + index.ToString(CultureInfo.InvariantCulture);
        else
          return "`" + index.ToString(CultureInfo.InvariantCulture);
      }
    }
    
    public IList<IUnresolvedAttribute> Attributes {
      get {
        if (attributes == null)
          attributes = new List<IUnresolvedAttribute>();
        return attributes;
      }
    }
    
    public IList<ITypeReference> Constraints {
      get {
        if (constraints == null)
          constraints = new List<ITypeReference>();
        return constraints;
      }
    }
    
    public VarianceModifier Variance {
      get { return variance; }
      set {
        FreezableHelper.ThrowIfFrozen(this);
        variance = value;
      }
    }
    
    public DomRegion Region {
      get { return region; }
      set {
        FreezableHelper.ThrowIfFrozen(this);
        region = value;
      }
    }
    
    public bool HasDefaultConstructorConstraint {
      get { return flags[FlagDefaultConstructorConstraint]; }
      set {
        FreezableHelper.ThrowIfFrozen(this);
        flags[FlagDefaultConstructorConstraint] = value;
      }
    }
    
    public bool HasReferenceTypeConstraint {
      get { return flags[FlagReferenceTypeConstraint]; }
      set {
        FreezableHelper.ThrowIfFrozen(this);
        flags[FlagReferenceTypeConstraint] = value;
      }
    }
    
    public bool HasValueTypeConstraint {
      get { return flags[FlagValueTypeConstraint]; }
      set {
        FreezableHelper.ThrowIfFrozen(this);
        flags[FlagValueTypeConstraint] = value;
      }
    }
    
    /// <summary>
    /// Uses the specified interning provider to intern
    /// strings and lists in this entity.
    /// This method does not test arbitrary objects to see if they implement ISupportsInterning;
    /// instead we assume that those are interned immediately when they are created (before they are added to this entity).
    /// </summary>
    public virtual void ApplyInterningProvider(InterningProvider provider)
    {
      if (provider == null)
        throw new ArgumentNullException("provider");
      FreezableHelper.ThrowIfFrozen(this);
      name = provider.Intern(name);
      attributes = provider.InternList(attributes);
      constraints = provider.InternList(constraints);
    }
    
    public virtual ITypeParameter CreateResolvedTypeParameter(ITypeResolveContext context)
    {
      IEntity owner = null;
      if (this.OwnerType == SymbolKind.Method) {
        owner = context.CurrentMember as IMethod;
      } else if (this.OwnerType == SymbolKind.TypeDefinition) {
        owner = context.CurrentTypeDefinition;
      }
      if (owner == null)
        throw new InvalidOperationException("Could not determine the type parameter's owner.");
      return new DefaultTypeParameter(
        owner, index, name, variance,
        this.Attributes.CreateResolvedAttributes(context), this.Region,
        this.HasValueTypeConstraint, this.HasReferenceTypeConstraint, this.HasDefaultConstructorConstraint, this.Constraints.Resolve(context)
      );
    }
  }
}