/// <summary>
/// Gets a specified unique file identifer frame from the
/// specified tag, optionally creating it if it does not
/// exist.
/// </summary>
/// <param name="tag">
/// A <see cref="Tag" /> object to search in.
/// </param>
/// <param name="owner">
/// A <see cref="string" /> specifying the owner to match.
/// </param>
/// <param name="create">
/// A <see cref="bool" /> specifying whether or not to create
/// and add a new frame to the tag if a match is not found.
/// </param>
/// <returns>
/// A <see cref="UserTextInformationFrame" /> object
/// containing the matching frame, or <see langword="null" />
/// if a match wasn't found and <paramref name="create" /> is
/// <see langword="false" />.
/// </returns>
public static UniqueFileIdentifierFrame Get(Tag tag,
string owner,
bool create)
{
UniqueFileIdentifierFrame ufid;
foreach (Frame frame in tag.GetFrames(FrameType.UFID))
{
ufid = frame as UniqueFileIdentifierFrame;
if (ufid == null)
{
continue;
}
if (ufid.Owner == owner)
{
return(ufid);
}
}
if (!create)
{
return(null);
}
ufid = new UniqueFileIdentifierFrame(owner, null);
tag.AddFrame(ufid);
return(ufid);
}
/// <summary>
/// Creates a deep copy of the current instance.
/// </summary>
/// <returns>
/// A new <see cref="Frame" /> object identical to the
/// current instance.
/// </returns>
public override Frame Clone()
{
UniqueFileIdentifierFrame frame =
new UniqueFileIdentifierFrame(owner);
if (identifier != null)
{
frame.identifier = new ByteVector(identifier);
}
return(frame);
}
