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//
// GenericParameter.cs
//
// Author:
// Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2010 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)); }
}
internal new bool HasImage {
get { return Module != null && Module.HasImage; }
}
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; }
}
#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;
}
}
}
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