/// <summary>
/// Opens an existing virtual disk.
/// </summary>
/// <param name="path">The path of the virtual disk to open, can be a URI</param>
/// <param name="access">The desired access to the disk</param>
/// <param name="user">The user name to use for authentication (if necessary)</param>
/// <param name="password">The password to use for authentication (if necessary)</param>
/// <returns>The Virtual Disk, or <c>null</c> if an unknown disk format</returns>
public static VirtualDisk OpenDisk(string path, FileAccess access, string user, string password)
{
Uri uri = PathToUri(path);
VirtualDisk result = null;
VirtualDiskTransport transport;
if (!DiskTransports.TryGetValue(uri.Scheme.ToUpperInvariant(), out transport))
{
throw new FileNotFoundException(string.Format(CultureInfo.InvariantCulture, "Unable to parse path '{0}'", path), path);
}
try
{
transport.Connect(uri, user, password);
if (transport.IsRawDisk)
{
result = transport.OpenDisk(access);
}
else
{
string extension = Path.GetExtension(uri.AbsolutePath).ToUpperInvariant();
if (extension.StartsWith(".", StringComparison.Ordinal))
{
extension = extension.Substring(1);
}
VirtualDiskFactory factory;
if (ExtensionMap.TryGetValue(extension, out factory))
{
result = factory.OpenDisk(transport.GetFileLocator(), transport.GetFileName(), access);
}
}
if (result != null)
{
result._transport = transport;
transport = null;
}
return(result);
}
finally
{
if (transport != null)
{
transport.Dispose();
}
}
}
/// <summary>
/// Create a new virtual disk.
/// </summary>
/// <param name="type">The type of disk to create (see <see cref="SupportedDiskTypes"/>)</param>
/// <param name="variant">The variant of the type to create (see <see cref="GetSupportedDiskVariants"/>)</param>
/// <param name="path">The path (or URI) for the disk to create</param>
/// <param name="capacity">The capacity of the new disk</param>
/// <param name="geometry">The geometry of the new disk (or null).</param>
/// <param name="user">The user identity to use when accessing the <c>path</c> (or null)</param>
/// <param name="password">The password to use when accessing the <c>path</c> (or null)</param>
/// <param name="parameters">Untyped parameters controlling the creation process (TBD)</param>
/// <returns>The newly created disk</returns>
public static VirtualDisk CreateDisk(string type, string variant, string path, long capacity, Geometry geometry, string user, string password, Dictionary <string, string> parameters)
{
Uri uri = PathToUri(path);
VirtualDisk result = null;
VirtualDiskTransport transport;
if (!DiskTransports.TryGetValue(uri.Scheme.ToUpperInvariant(), out transport))
{
throw new FileNotFoundException(string.Format(CultureInfo.InvariantCulture, "Unable to parse path '{0}'", path), path);
}
try
{
transport.Connect(uri, user, password);
if (transport.IsRawDisk)
{
result = transport.OpenDisk(FileAccess.ReadWrite);
}
else
{
VirtualDiskFactory factory = TypeMap[type];
result = factory.CreateDisk(transport.GetFileLocator(), variant.ToLowerInvariant(), Utilities.GetFileFromPath(path), capacity, geometry, parameters ?? new Dictionary <string, string>());
}
if (result != null)
{
result._transport = transport;
transport = null;
}
return(result);
}
finally
{
if (transport != null)
{
transport.Dispose();
}
}
}
/// <summary>
/// Locates VirtualDiskFactory factories attributed with VirtualDiskFactoryAttribute, and types marked with VirtualDiskTransportAttribute, that are able to work with Virtual Disk types.
/// </summary>
/// <param name="assembly">An assembly to scan</param>
public static void RegisterVirtualDiskTypes(Assembly assembly)
{
foreach (Type type in assembly.GetTypes())
{
VirtualDiskFactoryAttribute diskFactoryAttribute = (VirtualDiskFactoryAttribute)ReflectionHelper.GetCustomAttribute(type, typeof(VirtualDiskFactoryAttribute), false);
if (diskFactoryAttribute != null)
{
VirtualDiskFactory factory = (VirtualDiskFactory)Activator.CreateInstance(type);
TypeMap.Add(diskFactoryAttribute.Type, factory);
foreach (string extension in diskFactoryAttribute.FileExtensions)
{
ExtensionMap.Add(extension.ToUpperInvariant(), factory);
}
}
VirtualDiskTransportAttribute diskTransportAttribute = ReflectionHelper.GetCustomAttribute(type, typeof(VirtualDiskTransportAttribute), false) as VirtualDiskTransportAttribute;
if (diskTransportAttribute != null)
{
DiskTransports.Add(diskTransportAttribute.Scheme.ToUpperInvariant(), type);
}
}
}
