/// <summary>
/// Moves a file.
/// </summary>
/// <param name="newPath">The new full path of the file.</param>
/// <param name="collisionOption">How to deal with collisions with existing files.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A task which will complete after the file is moved.
/// </returns>
public async Task MoveAsync(string newPath, NameCollisionOption collisionOption, CancellationToken cancellationToken)
{
Requires.NotNullOrEmpty(newPath, "newPath");
await AwaitExtensions.SwitchOffMainThreadAsync(cancellationToken);
string newDirectory = System.IO.Path.GetDirectoryName(newPath);
string newName = System.IO.Path.GetFileName(newPath);
for (int counter = 1; ; counter++)
{
cancellationToken.ThrowIfCancellationRequested();
string candidateName = newName;
if (counter > 1)
{
candidateName = String.Format(
CultureInfo.InvariantCulture,
"{0} ({1}){2}",
System.IO.Path.GetFileNameWithoutExtension(newName),
counter,
System.IO.Path.GetExtension(newName));
}
string candidatePath = PortablePath.Combine(newDirectory, candidateName);
if (File.Exists(candidatePath))
{
switch (collisionOption)
{
case NameCollisionOption.FailIfExists:
throw new IOException("File already exists.");
case NameCollisionOption.GenerateUniqueName:
continue; // try again with a new name.
case NameCollisionOption.ReplaceExisting:
File.Delete(candidatePath);
break;
}
}
File.Move(_path, candidatePath);
_path = candidatePath;
_name = candidateName;
return;
}
}
/// <summary>
/// Checks whether a folder or file exists at the given location.
/// </summary>
/// <param name="name">The name of the file or folder to check for.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A task whose result is the result of the existence check.
/// </returns>
public async Task <ExistenceCheckResult> CheckExistsAsync(string name, CancellationToken cancellationToken)
{
Requires.NotNullOrEmpty(name, "name");
await AwaitExtensions.SwitchOffMainThreadAsync(cancellationToken);
string checkPath = PortablePath.Combine(this.Path, name);
if (File.Exists(checkPath))
{
return(ExistenceCheckResult.FileExists);
}
else if (Directory.Exists(checkPath))
{
return(ExistenceCheckResult.FolderExists);
}
else
{
return(ExistenceCheckResult.NotFound);
}
}
/// <summary>
/// Renames a file without changing its location.
/// </summary>
/// <param name="newName">The new leaf name of the file.</param>
/// <param name="collisionOption">How to deal with collisions with existing files.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>
/// A task which will complete after the file is renamed.
/// </returns>
public async Task RenameAsync(string newName, NameCollisionOption collisionOption, CancellationToken cancellationToken)
{
Requires.NotNullOrEmpty(newName, "newName");
await MoveAsync(PortablePath.Combine(System.IO.Path.GetDirectoryName(_path), newName), collisionOption, cancellationToken);
}