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JHOBLITT / DateTime-TimeZone-Alias-0.06 / lib / DateTime / TimeZone / Alias.pm 

            

              
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package DateTime::TimeZone::Alias;
use strict;
use Carp qw( croak );
use DateTime::TimeZone::Catalog;
use vars qw( $VERSION );
$VERSION = 0.06;
sub import {
    my $class = shift;
    return unless @_;
    $class->set( @_ );
}
sub set {
    my $class = shift;
    croak "Can't be called without any parameters" unless @_;
    my %p = @_;
    foreach my $key ( keys %p ) {
        if ( $class->is_alias( $p{ $key } ) ) {
                $DateTime::TimeZone::Catalog::LINKS{ $key } =
                        $DateTime::TimeZone::Catalog::LINKS{ $p{ $key } }; 
        } elsif ( $class->is_timezone( $p{ $key } ) ) {
                $DateTime::TimeZone::Catalog::LINKS{ $key } = $p{ $key };
        } elsif ( $p{ $key } eq 'floating' ) {
                $DateTime::TimeZone::Catalog::LINKS{ $key } = 'floating';
        } elsif ( $p{ $key } eq 'local' ) {
                $DateTime::TimeZone::Catalog::LINKS{ $key } = 'local';
        } elsif ( $p{ $key } eq 'UTC' || $p{ $key } eq 'Z' ) {
                $DateTime::TimeZone::Catalog::LINKS{ $key } = 'UTC';
        } elsif ( $p{ $key } =~ /^ ([\+\-])? (\d\d?) :? (\d\d) (?::?(\d\d))? $/x ) {
                        my $sign        = $1 || '+';
                my $hours       = $2;
                my $minutes     = $3;
                my $seconds     = sprintf( "%02d", $4 || 0 );
                $DateTime::TimeZone::Catalog::LINKS{ $key } = "$sign$hours:$minutes:$seconds";
        } else {
                croak "Aliases must point to a valid timezone or offset";
        }
    }
}
sub add {
    my $class = shift;
    croak "Can't be called without any parameters" unless @_;
    my %p = @_;
    foreach my $key ( keys %p ) {
        if ( ! $class->is_defined( $key )) {
                $class->set( %p );
        } else {
                croak "Attempt to redefine an alias or timezone";
        }
    }
}
sub remove {
    my $class = shift;
    return unless @_;
    foreach my $key ( @_ ) {
        if ( ! $class->is_alias( $key ) ) {
                croak "Attempt to delete a nonexistant alias";
        }
        delete $DateTime::TimeZone::Catalog::LINKS{ $key };
    }
}
sub value {
    my( $class, $key ) = @_;
    if ( $class->is_alias( $key ) ) {
        return $DateTime::TimeZone::Catalog::LINKS{ $key };
    } else {
        return undef;
    }
}
sub is_defined {
    my( $class, $def_candidate ) = @_;
    if (
        $class->is_timezone( $def_candidate )
        || $class->is_alias( $def_candidate )
    ) {
        return 1;
    } else {
        return undef;
    }
}
sub is_alias {
    my( $class, $alias_candidate ) = @_;
    if ( exists $DateTime::TimeZone::Catalog::LINKS{ $alias_candidate } ) {
        return 1;
    } else {
        return undef;
    }
}
sub is_timezone {
    my( $class, $tz_candidate ) = @_;
    if ( grep( /^\Q${tz_candidate}\E$/, @DateTime::TimeZone::Catalog::ALL ) ) {
        return 1;
    } else {
        return undef;
    }
}
sub aliases {
    my $class = shift;
    return unless defined wantarray;
    if ( wantarray ) {
        return %DateTime::TimeZone::Catalog::LINKS;
    } else {
        my %dttz_links_copy = %DateTime::TimeZone::Catalog::LINKS;
        return \%dttz_links_copy;
    }
}
sub timezones {
    my $class = shift;
    return unless defined wantarray;
    if ( wantarray ) {
        return @DateTime::TimeZone::Catalog::ALL;
    } else {
        my @dttz_all_copy = @DateTime::TimeZone::Catalog::ALL;
        return \@dttz_all_copy;
    }
}
1;
__END__