source: branches/CodeEditor/HeuristicLab.ExtLibs/HeuristicLab.Cecil/0.9.5/Mono.Cecil-0.9.5/Mono.Cecil/Mono.Cecil/GenericParameter.cs @ 11700

//
// GenericParameter.cs
//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2011 Jb Evain
//
// 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 Mono.Collections.Generic;

using Mono.Cecil.Metadata;

namespace Mono.Cecil {

  public sealed class GenericParameter : TypeReference, ICustomAttributeProvider {

    readonly IGenericParameterProvider owner;

    ushort attributes;
    Collection<TypeReference> constraints;
    Collection<CustomAttribute> custom_attributes;

    public GenericParameterAttributes Attributes {
      get { return (GenericParameterAttributes) attributes; }
      set { attributes = (ushort) value; }
    }

    public int Position {
      get {
        if (owner == null)
          return -1;

        return owner.GenericParameters.IndexOf (this);
      }
    }

    public IGenericParameterProvider Owner {
      get { return owner; }
    }

    public bool HasConstraints {
      get {
        if (constraints != null)
          return constraints.Count > 0;

        if (HasImage)
          return Module.Read (this, (generic_parameter, reader) => reader.HasGenericConstraints (generic_parameter));

        return false;
      }
    }

    public Collection<TypeReference> Constraints {
      get {
        if (constraints != null)
          return constraints;

        if (HasImage)
          return constraints = Module.Read (this, (generic_parameter, reader) => reader.ReadGenericConstraints (generic_parameter));

        return constraints = new Collection<TypeReference> ();
      }
    }

    public bool HasCustomAttributes {
      get {
        if (custom_attributes != null)
          return custom_attributes.Count > 0;

        return this.GetHasCustomAttributes (Module);
      }
    }

    public Collection<CustomAttribute> CustomAttributes {
      get { return custom_attributes ?? (custom_attributes = this.GetCustomAttributes (Module)); }
    }

    public override IMetadataScope Scope {
      get {
        if (owner.GenericParameterType == GenericParameterType.Method)
          return ((MethodReference) owner).DeclaringType.Scope;

        return ((TypeReference) owner).Scope;
      }
    }

    public override ModuleDefinition Module {
      get { return ((MemberReference) owner).Module; }
    }

    public override string Name {
      get {
        if (!string.IsNullOrEmpty (base.Name))
          return base.Name;

        return base.Name = (owner.GenericParameterType == GenericParameterType.Type ? "!" : "!!") + Position;
      }
    }

    public override string Namespace {
      get { return string.Empty; }
      set { throw new InvalidOperationException (); }
    }

    public override string FullName {
      get { return Name; }
    }

    public override bool IsGenericParameter {
      get { return true; }
    }

    internal override bool ContainsGenericParameter {
      get { return true; }
    }

    public override MetadataType MetadataType {
      get { return (MetadataType) etype; }
    }

    #region GenericParameterAttributes

    public bool IsNonVariant {
      get { return attributes.GetMaskedAttributes ((ushort) GenericParameterAttributes.VarianceMask, (ushort) GenericParameterAttributes.NonVariant); }
      set { attributes = attributes.SetMaskedAttributes ((ushort) GenericParameterAttributes.VarianceMask, (ushort) GenericParameterAttributes.NonVariant, value); }
    }

    public bool IsCovariant {
      get { return attributes.GetMaskedAttributes ((ushort) GenericParameterAttributes.VarianceMask, (ushort) GenericParameterAttributes.Covariant); }
      set { attributes = attributes.SetMaskedAttributes ((ushort) GenericParameterAttributes.VarianceMask, (ushort) GenericParameterAttributes.Covariant, value); }
    }

    public bool IsContravariant {
      get { return attributes.GetMaskedAttributes ((ushort) GenericParameterAttributes.VarianceMask, (ushort) GenericParameterAttributes.Contravariant); }
      set { attributes = attributes.SetMaskedAttributes ((ushort) GenericParameterAttributes.VarianceMask, (ushort) GenericParameterAttributes.Contravariant, value); }
    }

    public bool HasReferenceTypeConstraint {
      get { return attributes.GetAttributes ((ushort) GenericParameterAttributes.ReferenceTypeConstraint); }
      set { attributes = attributes.SetAttributes ((ushort) GenericParameterAttributes.ReferenceTypeConstraint, value); }
    }

    public bool HasNotNullableValueTypeConstraint {
      get { return attributes.GetAttributes ((ushort) GenericParameterAttributes.NotNullableValueTypeConstraint); }
      set { attributes = attributes.SetAttributes ((ushort) GenericParameterAttributes.NotNullableValueTypeConstraint, value); }
    }

    public bool HasDefaultConstructorConstraint {
      get { return attributes.GetAttributes ((ushort) GenericParameterAttributes.DefaultConstructorConstraint); }
      set { attributes = attributes.SetAttributes ((ushort) GenericParameterAttributes.DefaultConstructorConstraint, value); }
    }

    #endregion

    public GenericParameter (IGenericParameterProvider owner)
      : this (string.Empty, owner)
    {
    }

    public GenericParameter (string name, IGenericParameterProvider owner)
      : base (string.Empty, name)
    {
      if (owner == null)
        throw new ArgumentNullException ();

      this.owner = owner;
      this.etype = owner.GenericParameterType == GenericParameterType.Type ? ElementType.Var : ElementType.MVar;
    }

    public override TypeDefinition Resolve ()
    {
      return null;
    }
  }
}