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//
// Extensions.cs
//
// Author:
// Jb Evain (jbevain@novell.com)
//
// (C) 2008 Novell, Inc. (http://www.novell.com)
//
// 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 System.Reflection;
using System.Reflection.Emit;
using System.Runtime.CompilerServices;
namespace System.Linq.Expressions {
static class Extensions {
public static bool IsGenericInstanceOf (this Type self, Type type)
{
if (!self.IsGenericType)
return false;
return self.GetGenericTypeDefinition () == type;
}
public static bool IsNullable (this Type self)
{
return self.IsValueType && self.IsGenericInstanceOf (typeof (Nullable<>));
}
public static bool IsExpression (this Type self)
{
return self == typeof (Expression) || self.IsSubclassOf (typeof (Expression));
}
public static bool IsGenericImplementationOf (this Type self, Type type)
{
foreach (Type iface in self.GetInterfaces ())
if (iface.IsGenericInstanceOf (type))
return true;
return false;
}
public static bool IsAssignableTo (this Type self, Type type)
{
return type.IsAssignableFrom (self) ||
ArrayTypeIsAssignableTo (self, type);
}
public static Type GetFirstGenericArgument (this Type self)
{
return self.GetGenericArguments () [0];
}
public static Type MakeGenericTypeFrom (this Type self, Type type)
{
return self.MakeGenericType (type.GetGenericArguments ());
}
public static Type MakeNullableType (this Type self)
{
return typeof (Nullable<>).MakeGenericType (self);
}
public static Type GetNotNullableType (this Type self)
{
return self.IsNullable () ? self.GetFirstGenericArgument () : self;
}
public static MethodInfo GetInvokeMethod (this Type self)
{
return self.GetMethod ("Invoke", BindingFlags.Public | BindingFlags.Instance);
}
public static MethodInfo MakeGenericMethodFrom (this MethodInfo self, MethodInfo method)
{
return self.MakeGenericMethod (method.GetGenericArguments ());
}
public static Type [] GetParameterTypes (this MethodBase self)
{
var parameters = self.GetParameters ();
var types = new Type [parameters.Length];
for (int i = 0; i < types.Length; i++)
types [i] = parameters [i].ParameterType;
return types;
}
static bool ArrayTypeIsAssignableTo (Type type, Type candidate)
{
if (!type.IsArray || !candidate.IsArray)
return false;
if (type.GetArrayRank () != candidate.GetArrayRank ())
return false;
return type.GetElementType ().IsAssignableTo (candidate.GetElementType ());
}
public static void OnFieldOrProperty (this MemberInfo self,
Action<FieldInfo> onfield, Action<PropertyInfo> onprop)
{
switch (self.MemberType) {
case MemberTypes.Field:
onfield ((FieldInfo) self);
return;
case MemberTypes.Property:
onprop ((PropertyInfo) self);
return;
default:
throw new ArgumentException ();
}
}
public static T OnFieldOrProperty<T> (this MemberInfo self,
Func<FieldInfo, T> onfield, Func<PropertyInfo, T> onprop)
{
switch (self.MemberType) {
case MemberTypes.Field:
return onfield ((FieldInfo) self);
case MemberTypes.Property:
return onprop ((PropertyInfo) self);
default:
throw new ArgumentException ();
}
}
public static Type MakeStrongBoxType (this Type self)
{
return typeof (StrongBox<>).MakeGenericType (self);
}
}
}
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