-package DBIx::Class::Componentised;
+package # hide from PAUSE
+ DBIx::Class::Componentised;
+
+use strict;
+use warnings;
use Class::C3;
+use Class::Inspector;
+use Carp::Clan qw/^DBIx::Class/;
sub inject_base {
my ($class, $target, @to_inject) = @_;
{
no strict 'refs';
- unshift(@{"${target}::ISA"}, grep { $target ne $_ && !$target->isa($_)} @to_inject);
+ foreach my $to (reverse @to_inject) {
+ my @comps = qw(DigestColumns ResultSetManager Ordered UTF8Columns);
+ # Add components here that need to be loaded before Core
+ foreach my $first_comp (@comps) {
+ if ($to eq 'DBIx::Class::Core' &&
+ $target->isa("DBIx::Class::${first_comp}")) {
+ warn "Possible incorrect order of components in ".
+ "${target}::load_components($first_comp) call: Core loaded ".
+ "before $first_comp. See the documentation for ".
+ "DBIx::Class::$first_comp for more information";
+ }
+ }
+ unshift( @{"${target}::ISA"}, $to )
+ unless ($target eq $to || $target->isa($to));
+ }
}
# Yes, this is hack. But it *does* work. Please don't submit tickets about
# it on the basis of the comments in Class::C3, the author was on #dbix-class
# while I was implementing this.
- my $table = { Class::C3::_dump_MRO_table };
- eval "package $target; import Class::C3;" unless exists $table->{$target};
+ eval "package $target; import Class::C3;" unless exists $Class::C3::MRO{$target};
}
sub load_components {
sub _load_components {
my ($class, @comp) = @_;
foreach my $comp (@comp) {
- eval "use $comp";
- die $@ if $@;
+ $class->ensure_class_loaded($comp);
}
$class->inject_base($class => @comp);
}
+# Given a class name, tests to see if it is already loaded or otherwise
+# defined. If it is not yet loaded, the package is require'd, and an exception
+# is thrown if the class is still not loaded.
+#
+# TODO: handle ->has_many('rel', 'Class'...) instead of
+# ->has_many('rel', 'Some::Schema::Class'...)
+#
+# BUG: For some reason, packages with syntax errors are added to %INC on
+# require
+sub ensure_class_loaded {
+ my ($class, $f_class) = @_;
+
+ croak "Invalid class name $f_class"
+ if ($f_class=~m/(?:\b:\b|\:{3,})/);
+ return if Class::Inspector->loaded($f_class);
+ eval "require $f_class"; # require needs a bareword or filename
+ if ($@) {
+ if ($class->can('throw_exception')) {
+ $class->throw_exception($@);
+ } else {
+ croak $@;
+ }
+ }
+}
+
+# Returns true if the specified class is installed or already loaded, false
+# otherwise
+sub ensure_class_found {
+ my ($class, $f_class) = @_;
+ return Class::Inspector->loaded($f_class) ||
+ Class::Inspector->installed($f_class);
+}
+
+# Returns a true value if the specified class is installed and loaded
+# successfully, throws an exception if the class is found but not loaded
+# successfully, and false if the class is not installed
+sub load_optional_class {
+ my ($class, $f_class) = @_;
+ if ($class->ensure_class_found($f_class)) {
+ $class->ensure_class_loaded($f_class);
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
1;