/
InterfaceProxyWithoutTargetContributor.cs
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/
InterfaceProxyWithoutTargetContributor.cs
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// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
namespace Castle.DynamicProxy.Contributors
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Castle.DynamicProxy.Generators;
using Castle.DynamicProxy.Generators.Emitters;
internal class InterfaceProxyWithoutTargetContributor : CompositeTypeContributor
{
private readonly GetTargetExpressionDelegate getTargetExpression;
protected bool canChangeTarget = false;
public InterfaceProxyWithoutTargetContributor(INamingScope namingScope, GetTargetExpressionDelegate getTarget)
: base(namingScope)
{
getTargetExpression = getTarget;
}
protected override IEnumerable<MembersCollector> CollectElementsToProxyInternal(IProxyGenerationHook hook)
{
Debug.Assert(hook != null, "hook != null");
foreach (var @interface in interfaces)
{
var item = new InterfaceMembersCollector(@interface);
item.CollectMembersToProxy(hook);
yield return item;
}
}
protected override MethodGenerator GetMethodGenerator(MetaMethod method, ClassEmitter @class,
OverrideMethodDelegate overrideMethod)
{
if (!method.Proxyable)
{
return new MinimialisticMethodGenerator(method, overrideMethod);
}
var invocation = GetInvocationType(method, @class);
return new MethodWithInvocationGenerator(method,
@class.GetField("__interceptors"),
invocation,
getTargetExpression,
overrideMethod,
null);
}
private Type GetInvocationType(MetaMethod method, ClassEmitter emitter)
{
var scope = emitter.ModuleScope;
Type[] invocationInterfaces;
if (canChangeTarget)
{
invocationInterfaces = new[] { typeof(IInvocation), typeof(IChangeProxyTarget) };
}
else
{
invocationInterfaces = new[] { typeof(IInvocation) };
}
var key = new CacheKey(method.Method, CompositionInvocationTypeGenerator.BaseType, invocationInterfaces, null);
// no locking required as we're already within a lock
return scope.TypeCache.GetOrAddWithoutTakingLock(key, _ =>
new CompositionInvocationTypeGenerator(method.Method.DeclaringType,
method,
method.Method,
canChangeTarget,
null)
.Generate(emitter, namingScope)
.BuildType());
}
}
}