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# ------------------------------------------------------------------------------
# Copyright (C) 2006-2021 British Crown (Met Office) & Contributors.
#
# This file is part of FCM, tools for managing and building source code.
#
# FCM is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# FCM is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with FCM. If not, see <http://www.gnu.org/licenses/>.
# ------------------------------------------------------------------------------
use strict;
use warnings;
package FCM1::Util::ClassLoader;
use base qw{Exporter};
our @EXPORT_OK = qw{load};
use Carp qw{croak};
use FCM1::Exception;
sub load {
my ($class, $test_method) = @_;
if (!$test_method) {
$test_method = 'new';
}
if (!UNIVERSAL::can($class, $test_method)) {
eval('require ' . $class);
if ($@) {
croak(FCM1::Exception->new({message => sprintf(
"%s: class loading failed: %s", $class, $@,
)}));
}
}
return $class;
}
1;
__END__
=head1 NAME
FCM1::ClassLoader
=head1 SYNOPSIS
use FCM1::Util::ClassLoader;
$load_ok = FCM1::Util::ClassLoader::load($class);
=head1 DESCRIPTION
A wrapper for loading a class dynamically.
=head1 FUNCTIONS
=over 4
=item load($class,$test_method)
If $class can call $test_method, returns $class. Otherwise, attempts to
require() $class and returns it. If this fails, croak() with a
L<FCM1::Exception|FCM1::Exception>.
=item load($class)
Shorthand for C<load($class, 'new')>.
=back
=head1 DIAGNOSTICS
=over 4
=item L<FCM1::Exception|FCM1::Exception>
The load($class,$test_method) function croak() with this exception if it fails
to load the specified class.
=back
=head1 COPYRIGHT
Copyright (C) 2006-2021 British Crown (Met Office) & Contributors.
=cut
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