exiv2-sharp/exiv2/ImageFactory.custom

/*
 * ImageFactory.custom: async loaders for ImageFactory
 *
 * Author(s):
 *	Stephane Delcroix  (stephane@delcroix.org)
 *
 * Copyright (c) 2008 Novell, Inc.
 *
 * 
 * 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.
 *
 */
public static event OpenCompletedEventHandler OpenCompleted;

public static void OpenAsync (string path)
{
	OpenAsync (path, null);
}

public static void OpenAsync (string path, object userToken)
{
	OpenAsync (path, userToken, null);
}

public static void OpenAsync (string path, object userToken, OpenCompletedEventHandler completed_handler)
{
	if (String.IsNullOrEmpty (path))
		throw new ArgumentException ("path");
	
	System.Threading.Thread async_thread = new System.Threading.Thread (delegate (object state) {
		object [] args = (object []) state;
		try {
			Exiv2.Image data = Open (path);
			OnOpenCompleted (new OpenCompletedEventArgs (data, null, false, args [1]), completed_handler);
		} catch (System.Threading.ThreadInterruptedException) {
			OnOpenCompleted (new OpenCompletedEventArgs (null, null, true, args [1]), completed_handler);
		} catch (Exception e) {
			OnOpenCompleted (new OpenCompletedEventArgs (null, e, false, args [1]), completed_handler);
		}
	});
	object [] cb_args = new object [] {path, userToken};
	async_thread.Start (cb_args);
}

public static void OpenAsync (System.IO.Stream stream)
{
	OpenAsync (stream, null);
}

public static void OpenAsync (System.IO.Stream stream, object userToken)
{
	OpenAsync (stream, userToken, null);
}

public static void OpenAsync (System.IO.Stream stream, object userToken, OpenCompletedEventHandler completed_handler)
{
	if (stream == null)
		throw new ArgumentException ("stream");
	
	System.Threading.Thread async_thread = new System.Threading.Thread (delegate (object state) {
		object [] args = (object []) state;
		try {
			long length = stream.Length;
			byte [] buffer = new byte [length];
			int offset = 0, count;
			while ((count = stream.Read (buffer, offset, length - offset > 1024 ? 1024 : (int)(length - offset))) > 0)
				offset+=count;
			Exiv2.Image data = Open (buffer);
			OnOpenCompleted (new OpenCompletedEventArgs (data, null, false, args [1]), completed_handler);
		} catch (System.Threading.ThreadInterruptedException) {
			OnOpenCompleted (new OpenCompletedEventArgs (null, null, true, args [1]), completed_handler);
		} catch (Exception e) {
			OnOpenCompleted (new OpenCompletedEventArgs (null, e, false, args [1]), completed_handler);
		}
	});
	object [] cb_args = new object [] {stream, userToken};
	async_thread.Start (cb_args);
}

static void OnOpenCompleted (OpenCompletedEventArgs args, OpenCompletedEventHandler completed_handler)
{
	if (completed_handler != null)
		completed_handler (null, args);
	if (OpenCompleted != null)
		OpenCompleted (null, args);
}