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/* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com */
using System;
using Db4objects.Db4o;
using Db4objects.Db4o.Events;
using Db4objects.Db4o.Internal;
using Db4objects.Db4o.Internal.Callbacks;
using Db4objects.Db4o.Internal.Events;
namespace Db4objects.Db4o.Events
{
/// <summary>
/// Provides an interface for getting an
/// <see cref="IEventRegistry">IEventRegistry</see>
/// from an
/// <see cref="IObjectContainer">IObjectContainer</see>
/// .
/// </summary>
public class EventRegistryFactory
{
/// <summary>
/// Returns an
/// <see cref="IEventRegistry">IEventRegistry</see>
/// for registering events with the specified container.
/// </summary>
public static IEventRegistry ForObjectContainer(IObjectContainer objectContainer)
{
if (null == objectContainer)
{
throw new ArgumentNullException();
}
ObjectContainerBase container = ((ObjectContainerBase)objectContainer);
ICallbacks callbacks = container.Callbacks();
if (callbacks is IEventRegistry)
{
return (IEventRegistry)callbacks;
}
if (callbacks is NullCallbacks)
{
EventRegistryImpl impl = new EventRegistryImpl(container);
container.Callbacks(impl);
return impl;
}
throw new ArgumentException();
}
}
}
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