File Coverage

blib/lib/Dancer/Engine.pm

Criterion	Covered	Total	%
statement	44	44	100.0
branch	12	12	100.0
condition	8	9	88.8
subroutine	10	10	100.0
pod	2	3	66.6
total	76	78	97.4

package Dancer::Engine;
our $AUTHORITY = 'cpan:SUKRIA';
#ABSTRACT: base class for Dancer engines
$Dancer::Engine::VERSION = '1.3521';
# This is the base-class of every engine abstract class.
# This allow us to put in that single place the engine creation
# from a namespace and a name, to its configuration initialization.

use strict;
use warnings;
use Carp;
use Dancer::ModuleLoader;
use base 'Dancer::Object';
use Dancer::Exception qw(:all);

# constructor arguments:
#      name     => $name_of_the_engine
#      settings => $hash_of_engine_settings
Dancer::Engine->attributes(qw(name type));

# Accessor to the config hash, it may not be initialized if someone
# creates a new engine without giving the appropriate arguments.
# e.g. Dancer::Template::Simple->new();
sub config {
    my ($self) = @_;
    return $self->{config} if defined $self->{config};
    $self->{config} = {};
}

# static method for initializing an engine
# this will create an engine instance of the appropriate $type, named $name
# if Dancer::$type::$name exists.
sub build {
    my ($class, $type, $name, $config) = @_;

    raise core_engine => "cannot build engine without type and name "
      unless $name and $type;

    my $class_name = $class->_engine_class($type);

    $config ||= {};
    $config->{engines} ||= {};
    my $settings = $config->{engines}{$name} || {};

    # trying to load the engine
    my $engine_class =
      Dancer::ModuleLoader->class_from_setting($class_name => $name);

    my( $loaded, $error ) = Dancer::ModuleLoader->load($engine_class);
    $error = '' unless defined $error;

    unless( $loaded ) {
        my $tip = '';
        if( $error =~ /Can't locate (\S+)\.pm in \@INC/ ) {
            my $module = $1;
            $module =~ s#/#::#g;
            $tip = " (perhaps you need to install $module?)";
        }

        $error = ": $error" if length $error;
        raise core_engine => "unable to load $type engine '$name'$tip$error";
    }

    # creating the engine
    return $engine_class->new(
        name   => $name,
        type   => $type,
        config => $settings,
    );
}

sub _engine_class {
    my ($class, $type) = @_;
    $type = ucfirst($type);
    return "Dancer::${type}";
}

sub engine {
    my ($class, $type) = @_;
    return $class->_engine_class($type)->engine();
}


1;

__END__