package Jifty::DBI::Filter::Duration;

use warnings;
use strict;

use base qw|Jifty::DBI::Filter|;
use Time::Duration qw();
use Time::Duration::Parse qw();

=head1 NAME

Jifty::DBI::Filter::Duration - Encodes time durations


=head2 encode

If value is defined, then encode it using
L<Time::Duration::Parse/parse_duration>, otherwise do nothing.  If the value
can't be parsed, then set it to undef.


sub encode {
    my $self = shift;

    my $value_ref = $self->value_ref;
    return unless defined $$value_ref and length $$value_ref;

    my ($parsed) = eval { Time::Duration::Parse::parse_duration($$value_ref) };

    if ( not $@ ) {
        $$value_ref = $parsed;
        return 1;
    else {
        $$value_ref = undef;

=head2 decode

If value is defined, then decode it using
L<Time::Duration/duration_exact> and L<Time::Duration/concise>,
otherwise do nothing.


sub decode {
    my $self = shift;

    my $value_ref = $self->value_ref;
    return unless defined $$value_ref and length $$value_ref
              and $$value_ref =~ /^\s*\d+\s*$/;

    $$value_ref = Time::Duration::concise(Time::Duration::duration_exact($$value_ref));

=head1 SEE ALSO

L<Jifty::DBI::Filter>, L<Time::Duration>, L<Time::Duration::Parse>