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For most people, the bulk of the data they want to process comes from the contents of a file However, a significant amount of information is stored along with file data The most obvious is the file s name, but this is often coupled with additional information about the file This information is often called metadata, since it refers to metaphorical information about a file, rather than the file data itself The exact specification of this information is reliant on the operating system, but it usually includes permissions (or attributes), ownership, and more trivial information such as modification times and the file size

7:

The TIESCALAR is a class method and, as such, is passed the name of the class, which you ll use when blessing the new object you create, and the list of additional arguments passed to the tie function For our example, there is only one argument the name of the file to use for determining and setting file ownership The method should return an object, blessed accordingly The content of the scalar object is the

1 2 3 4 5 6 7 8 9 package comwickedlysmart; import comwickedlysmart2*; public class Launcher { public static void main(String[] args) { Utils u = new Utils(); udo1(); udo2(); udo3(); } }

name of the file you supplied when the object was created Thus, you get a method like this:

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sub TIESCALAR { my $class = shift; my $file = shift; unless (-e $file) { carp("File $file does not exist"); return undef; } return bless \$file,$class; }

Note that you must make sure the file exists before you continue You can t create an object that refers to a file that doesn t exist The method returns an undefined object if the file does not exist, and this will be picked up by tie You also report an error via the carp function, defined in the Carp module, which supports a more package-friendly way of raising errors In essence, the object you have created is anonymous, since you return the reference to the $file variable directly tie does what it needs to with the returned object

The FETCH method is called every time the tied variable is accessed It takes only one argument, THIS, which is a reference to the corresponding object that is tied to the variable Because we re working with scalars, the dereferencing is easy The complex part is the determination of the owner of the file and the resulting resolving process to convert the user ID returned into a user name

and the correctly compiled and located:

sub FETCH { my $self = shift; local $! = 0; my $userid = (stat($$self))[4]; if ($!) { croak("Can't get file owner: $!") } local $! = 0;

10:

my $owner = getpwuid($userid); $owner = $userid unless (defined($owner)); return $owner; }

1 package comwickedlysmart2; 2 class Utils { 3 void do1() { Systemoutprint("do1 "); } 4 protected void do2() { Systemoutprint("do2 "); } 5 public void do3() { Systemoutprint("do3 "); } 6 }

The return value from this method is the user name or user ID Because of this, you have no way of raising an error exception to the calling script, so you have to use croak to indicate a serious problem when determining the owner of the file

The STORE method is called whenever an assignation is made to the tied variable Beyond the object reference that is passed, tie also passes the value you want stored in the scalar variable you are tied to

sub STORE { my $self = shift; my $owner = shift; confess("Wrong type") unless ref $self; croak("Too many arguments") if @_; my $userid; if ($owner =~ /$[a-zA-Z]+/) { $userid = getpwnam($owner) } else { $userid = $owner; } local $! = 0; chown($userid,$$self); if ($!) { croak("Can't set file ownership: $!") } return $owner; }

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