1 package Class::C3::Componentised;
5 Class::C3::Componentised
9 Load mix-ins or components to your C3-based class.
18 use base 'Class::C3::Componentised';
20 sub component_base_class { "MyModule::Component" }
24 MyModule->load_components( qw/Foo Bar/ );
25 # Will load MyModule::Component::Foo and MyModule::Component::Bar
29 This will inject base classes to your module using the L<Class::C3> method
32 Please note: these are not plugins that can take precedence over methods
33 declared in MyModule. If you want something like that, consider
34 L<MooseX::Object::Pluggable>.
47 our $VERSION = 1.0006;
49 =head2 load_components( @comps )
51 Loads the given components into the current module. If a module begins with a
52 C<+> character, it is taken to be a fully qualified class name, otherwise
53 C<< $class->component_base_class >> is prepended to it.
55 Calling this will call C<Class::C3::reinitialize>.
64 : join ('::', $class->component_base_class, $_)
66 grep { $_ !~ /^#/ } @_;
67 $class->_load_components(@comp);
70 =head2 load_own_components( @comps )
72 Similar to L<load_components>, but assumes every class is C<"$class::$comp">.
76 sub load_own_components {
78 my @comp = map { "${class}::$_" } grep { $_ !~ /^#/ } @_;
79 $class->_load_components(@comp);
82 sub _load_components {
83 my ($class, @comp) = @_;
84 foreach my $comp (@comp) {
85 $class->ensure_class_loaded($comp);
87 $class->inject_base($class => @comp);
88 Class::C3::reinitialize();
91 =head2 load_optional_components
93 As L<load_components>, but will silently ignore any components that cannot be
98 sub load_optional_components {
100 my @comp = grep { $class->load_optional_class( $_ ) }
104 : join ('::', $class->component_base_class, $_)
106 grep { $_ !~ /^#/ } @_;
108 $class->_load_components( @comp ) if scalar @comp;
111 =head2 ensure_class_loaded
113 Given a class name, tests to see if it is already loaded or otherwise
114 defined. If it is not yet loaded, the package is require'd, and an exception
115 is thrown if the class is still not loaded.
117 BUG: For some reason, packages with syntax errors are added to %INC on
122 # TODO: handle ->has_many('rel', 'Class'...) instead of
123 # ->has_many('rel', 'Some::Schema::Class'...)
125 sub ensure_class_loaded {
126 my ($class, $f_class) = @_;
128 croak "Invalid class name $f_class"
129 if ($f_class=~m/(?:\b:\b|\:{3,})/);
130 return if Class::Inspector->loaded($f_class);
131 my $file = $f_class . '.pm';
133 eval { CORE::require($file) }; # require needs a bareword or filename
135 if ($class->can('throw_exception')) {
136 $class->throw_exception($@);
143 =head2 ensure_class_found
145 Returns true if the specified class is installed or already loaded, false
148 Note that the underlying mechanism (Class::Inspector->installed()) used by this
149 sub will not, at the time of writing, correctly function when @INC includes
150 coderefs. Since PAR relies upon coderefs in @INC, this function should be
151 avoided in modules that are likely to be included within a PAR.
155 sub ensure_class_found {
156 my ($class, $f_class) = @_;
157 return Class::Inspector->loaded($f_class) ||
158 Class::Inspector->installed($f_class);
164 Does the actual magic of adjusting @ISA on the target module.
169 my ($class, $target, @to_inject) = @_;
172 foreach my $to (reverse @to_inject) {
173 unshift ( @{"${target}::ISA"}, $to )
174 unless ($target eq $to || $target->isa($to));
178 mro::set_mro($target, 'c3');
181 =head2 load_optional_class
183 Returns a true value if the specified class is installed and loaded
184 successfully, throws an exception if the class is found but not loaded
185 successfully, and false if the class is not installed
189 sub load_optional_class {
190 my ($class, $f_class) = @_;
191 eval { $class->ensure_class_loaded($f_class) };
192 my $err = $@; # so we don't lose it
197 my $fn = (join ('/', split ('::', $f_class) ) ) . '.pm';
198 if ($err =~ /Can't locate ${fn} in \@INC/ ) {
209 Matt S. Trout and the DBIx::Class team
211 Pulled out into seperate module by Ash Berlin C<< <ash@cpan.org> >>
215 You may distribute this code under the same terms as Perl itself.