/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System; using Microsoft;
using System.Diagnostics;
#if CODEPLEX_40
using System.Linq.Expressions;
#else
using Microsoft.Linq.Expressions;
#endif
using System.Runtime.CompilerServices;
#if !CODEPLEX_40
using Microsoft.Runtime.CompilerServices;
#endif
#if CODEPLEX_40
namespace System.Dynamic{
#else
namespace Microsoft.Scripting {
#endif
internal sealed class SplatCallSite {
// Stored callable Delegate or IDynamicMetaObjectProvider.
internal readonly object _callable;
// Can the number of arguments to a given event change each call?
// If not, we don't need this level of indirection--we could cache a
// delegate that does the splatting.
internal CallSite<Func<CallSite, object, object[], object>> _site;
internal SplatCallSite(object callable) {
Debug.Assert(callable != null);
_callable = callable;
}
internal object Invoke(object[] args) {
Debug.Assert(args != null);
// If it is a delegate, just let DynamicInvoke do the binding.
var d = _callable as Delegate;
if (d != null) {
return d.DynamicInvoke(args);
}
// Otherwise, create a CallSite and invoke it.
if (_site == null) {
_site = CallSite<Func<CallSite, object, object[], object>>.Create(SplatInvokeBinder.Instance);
}
return _site.Target(_site, _callable, args);
}
}
}
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