/// <summary>
/// takes a certain baseInterface and weaves an IAspectComponent Type
/// the objects of this type are wrappers which add a certain functionality defined
/// by the connected aspect(s)
/// </summary>
/// <param name="iface">interface to create wrapper for</param>
/// <param name="additional">additional interfaces the aspect/object component should support</param>
/// <returns>created Type</returns>
public Type WeaveType(Type iface, Type[] additional)
{
// Create new type
TypeCodeBuilder tcBuilder = codeBuilder.DefineType("Aspect" + iface.Name);
// Params
IDictionary fields = new Hashtable();
// add implementation for interface IAspectComponent
ImplementAspectComponent(iface, tcBuilder, fields);
// add implementation for interface iface
ImplementInterface(iface, "OnMethodCall", tcBuilder, fields);
// add additional interfaces
if (additional != null)
{
foreach (Type t in additional)
{
ImplementInterface(t, "OnAdditionalMethodCall", tcBuilder, fields);
}
}
// create type and save assembly
Type aspectType = tcBuilder.TypeBuilder.CreateType();
return(aspectType);
}
void ImplementInterface(Type baseInterface, string calledMethod, TypeCodeBuilder tcBuilder, IDictionary fields)
{
// Add Interface baseInterface
TypeBuilder builder = tcBuilder.TypeBuilder;
builder.AddInterfaceImplementation(baseInterface);
// get methods from baseInterface and create wrapper methods
MethodInfo[] methods = baseInterface.GetMethods();
foreach (MethodInfo m in methods)
{
ImplementMethod(m, calledMethod, fields, builder);
}
}
//---------------------------------------------------------------
#endregion
//---------------------------------------------------------------
//---------------------------------------------------------------
#region Internal Helper Methods
//---------------------------------------------------------------
void ImplementAspectComponent(Type baseInterface, TypeCodeBuilder tcBuilder, IDictionary fields)
{
// Add Interface IAspectComponent
TypeBuilder builder = tcBuilder.TypeBuilder;
builder.AddInterfaceImplementation(typeof(IAspectComponent));
// property baseInstance
FieldBuilder fbBaseInstance = builder.DefineField("baseInstance", baseInterface, FieldAttributes.Private);
tcBuilder.DefineStandardProperty("BaseInstance", fbBaseInstance, typeof(object), true, true, MethodAttributes.Public);
fields["baseInstance"] = fbBaseInstance;
// property aspect
FieldBuilder fbAspect = builder.DefineField("aspectDispatcher", typeof(IAspectDispatcher), FieldAttributes.Private);
tcBuilder.DefineStandardProperty("AspectDispatcher", fbAspect, typeof(IAspectDispatcher), true, true, MethodAttributes.Public);
fields["aspectDispatcher"] = fbAspect;
}
