Current File : //usr/share/perl5/vendor_perl/Munin/Common/DictFile.pm
package Munin::Common::DictFile;
require Tie::Hash;
our @ISA = qw(Tie::StdHash);
our $DEBUG_ENABLED;
# The method invoked by the command tie %hash, classname.
# Associates a new hash instance with the specified class.
# LIST would represent additional arguments (along the lines
# of AnyDBM_File and compatriots) needed to complete the association.
sub TIEHASH {
my $classname = shift;
my ($filename) = @_;
my $self = {
__filename__ => $filename,
};
# Read the whole file if it exists
if (-e $filename) {
open(FILE, $filename) or die "Cannot open tied file '$filename' - $!";
while(my $line = <FILE>) {
chomp($line);
next unless $line =~ m/^'(.*)':\t'(.*)'$/;
# Found a valid line, store it
$self->{ _unescape($1) } = _unescape($2);
}
close(FILE);
}
return bless($self, $classname);
}
# Write everything down
sub DESTROY {
my $self = shift;
my $tmp_filename = $self->{__filename__} . ".tmp.$$";
open(FILE, "> $tmp_filename") or die "Cannot open temp file '$tmp_filename' - $!";
foreach my $key (keys %$self) {
print FILE "'" . _escape($key) . "':\t'" . _escape($self->{$key}) . "'\n";
}
close (FILE);
rename $tmp_filename, $self->{__filename__};
}
sub DEBUG {
print STDOUT "[DEBUG] @_" . "\n" if $DEBUG_ENABLED;
}
sub _escape {
my $string = shift;
$string =~ s/'/''/g;
return $string;
}
sub _unescape {
my $string = shift;
$string =~ s/''/'/g;
return $string;
}
1;
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