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package File::ExtAttr::Tie;
=head1 NAME
File::ExtAttr::Tie - Tie interface to extended attributes of files
=head1 SYNOPSIS
use File::ExtAttr::Tie;
use Data::Dumper;
tie %a,
"File::ExtAttr::Tie", "/Applications (Mac OS 9)/Sherlock 2",
{ namespace => 'user' };
print Dumper \%a;
produces:
$VAR1 = {
'com.apple.FinderInfo' => 'APPLfndf!?',
'com.apple.ResourceFork' => '?p?p5I'
};
=head1 DESCRIPTION
File::ExtAttr::Tie provides access to extended attributes of a file
through a tied hash. Creating a new key creates a new extended attribute
associated with the file. Modifying the value or removing a key likewise
modifies/removes the extended attribute.
Internally this module uses the File::ExtAttr module. So it has
the same restrictions as that module in terms of OS support.
=head1 METHODS
=over 4
=item tie "File::ExtAttr::Tie", $filename, [\%flags]
The flags are the same optional flags as in File::ExtAttr. Any flags
given here will be passed to all operations on the tied hash.
Only the C<namespace> flag makes sense. The hash will be tied
to the default namespace, if no flags are given.
=back
=cut
use strict;
use base qw(Tie::Hash);
use File::ExtAttr qw(:all);
our $VERSION = '0.01';
sub TIEHASH {
my($class, $file, $flags) = @_;
my $self = bless { file => $file }, ref $class || $class;
$self->{flags} = defined($flags) ? $flags : {};
return $self;
}
sub STORE {
my($self, $name, $value) = @_;
return undef unless setfattr($self->{file}, $name, $value, $self->{flags});
$value;
}
sub FETCH {
my($self, $name) = @_;
return getfattr($self->{file}, $name, $self->{flags});
}
sub FIRSTKEY {
my($self) = @_;
$self->{each_list} = [listfattr($self->{file}, $self->{flags})];
shift @{$self->{each_list}};
}
sub NEXTKEY {
my($self) = @_;
shift @{$self->{each_list}};
}
sub EXISTS {
my($self, $name) = @_;
return getfattr($self->{file}, $name, $self->{flags}) ne undef;
}
sub DELETE {
my($self, $name) = @_;
# XXX: Race condition
my $value = getfattr($self->{file}, $name, $self->{flags});
return $value if delfattr($self->{file}, $name, $self->{flags});
undef;
}
sub CLEAR {
my($self) = @_;
for(listfattr($self->{file})) {
delfattr($self->{file}, $_, $self->{flags});
}
}
#sub SCALAR { }
=head1 SEE ALSO
L<File::ExtAttr>
=head1 AUTHOR
David Leadbeater, L<http://dgl.cx/contact>
Documentation by Richard Dawe, E<lt>richdawe@cpan.orgE<gt>
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2006 by David Leadbeater
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.8.5 or,
at your option, any later version of Perl 5 you may have available.
1;
__END__
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