In order to support viewing deleted files (currently a blocker bug in
SwiftMedia), I'm going to refactor File::getPath() into a new public
function File::getLocalPath(), which will return an instance of a new
class TempLocalPath, which will have two methods: getPath(), and
close(). This class will own a local copy of the file. When it goes
out of scope or its close() method is called (same thing), any
resources held by the class will be freed.
With the upcoming FileBackend class and subclasses, this class will be
a requirement. Since I need it anyway, I may as well do the work now
to create it. File::getPath() will remain as a call, but it will throw
an exception if SwiftMedia is installed. When I get finished, its only
uses will be by extension writers who have chosen not to publish their
code in our SVN.