eleiminate vestigial code in PK::Auto
[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / Componentised.pm
CommitLineData
75d07914 1package # hide from PAUSE
c0e7b4e5 2 DBIx::Class::Componentised;
227d4dee 3
bf5ecff9 4use strict;
5use warnings;
6
147dd158 7use Class::C3;
c037c03a 8use Class::Inspector;
aaba9524 9use Carp::Clan qw/^DBIx::Class/;
147dd158 10
227d4dee 11sub inject_base {
12 my ($class, $target, @to_inject) = @_;
13 {
14 no strict 'refs';
eb47985e 15 foreach my $to (reverse @to_inject) {
df88a29c 16 my @comps = qw(DigestColumns ResultSetManager Ordered UTF8Columns);
17 # Add components here that need to be loaded before Core
18 foreach my $first_comp (@comps) {
19 if ($to eq 'DBIx::Class::Core' &&
20 $target->isa("DBIx::Class::${first_comp}")) {
21 warn "Possible incorrect order of components in ".
22 "${target}::load_components($first_comp) call: Core loaded ".
23 "before $first_comp. See the documentation for ".
24 "DBIx::Class::$first_comp for more information";
25 }
26 }
27 unshift( @{"${target}::ISA"}, $to )
28 unless ($target eq $to || $target->isa($to));
eb47985e 29 }
227d4dee 30 }
20518cb4 31
32 # Yes, this is hack. But it *does* work. Please don't submit tickets about
33 # it on the basis of the comments in Class::C3, the author was on #dbix-class
34 # while I was implementing this.
35
5c46030a 36 eval "package $target; import Class::C3;" unless exists $Class::C3::MRO{$target};
227d4dee 37}
38
39sub load_components {
40 my $class = shift;
7411204b 41 my $base = $class->component_base_class;
6db94aca 42 my @comp = map { /^\+(.*)$/ ? $1 : "${base}::$_" } grep { $_ !~ /^#/ } @_;
227d4dee 43 $class->_load_components(@comp);
971c0085 44 Class::C3::reinitialize();
227d4dee 45}
46
47sub load_own_components {
48 my $class = shift;
49 my @comp = map { "${class}::$_" } grep { $_ !~ /^#/ } @_;
50 $class->_load_components(@comp);
51}
52
53sub _load_components {
54 my ($class, @comp) = @_;
55 foreach my $comp (@comp) {
c037c03a 56 $class->ensure_class_loaded($comp);
227d4dee 57 }
58 $class->inject_base($class => @comp);
59}
60
efe6365b 61# Given a class name, tests to see if it is already loaded or otherwise
62# defined. If it is not yet loaded, the package is require'd, and an exception
63# is thrown if the class is still not loaded.
64#
c037c03a 65# TODO: handle ->has_many('rel', 'Class'...) instead of
66# ->has_many('rel', 'Some::Schema::Class'...)
9d3d92ab 67#
68# BUG: For some reason, packages with syntax errors are added to %INC on
69# require
c037c03a 70sub ensure_class_loaded {
71 my ($class, $f_class) = @_;
175e2616 72 return if Class::Inspector->loaded($f_class);
9d3d92ab 73 eval "require $f_class"; # require needs a bareword or filename
4d87db01 74 if ($@) {
75 if ($class->can('throw_exception')) {
76 $class->throw_exception($@);
77 } else {
78 croak $@;
79 }
80 }
efe6365b 81}
82
83# Returns true if the specified class is installed or already loaded, false
84# otherwise
85sub ensure_class_found {
86 my ($class, $f_class) = @_;
87 return Class::Inspector->loaded($f_class) ||
88 Class::Inspector->installed($f_class);
89}
90
91# Returns a true value if the specified class is installed and loaded
92# successfully, throws an exception if the class is found but not loaded
93# successfully, and false if the class is not installed
94sub load_optional_class {
95 my ($class, $f_class) = @_;
96 if ($class->ensure_class_found($f_class)) {
97 $class->ensure_class_loaded($f_class);
98 return 1;
99 } else {
100 return 0;
101 }
c037c03a 102}
103
227d4dee 1041;