1 package SQL::Translator::Schema::Object;
3 # ----------------------------------------------------------------------
4 # Copyright (C) 2002-2009 SQLFairy Authors
6 # This program is free software; you can redistribute it and/or
7 # modify it under the terms of the GNU General Public License as
8 # published by the Free Software Foundation; version 2.
10 # This program is distributed in the hope that it will be useful, but
11 # WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 # General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 # -------------------------------------------------------------------
25 SQL::Translator::Schema::Object - Base class SQL::Translator Schema objects.
31 Base class for Schema objects. Sub classes L<Class::Base> and adds the following
38 use base 'Class::Data::Inheritable';
39 use base 'Class::Base';
40 use Class::MakeMethods::Utility::Ref qw( ref_compare );
42 use vars qw[ $VERSION ];
49 Derived classes should declare their attributes using the C<_attributes>
50 method. They can then inherit the C<init> method from here which will call
51 accessors of the same name for any values given in the hash passed to C<new>.
52 Note that you will have to impliment the accessors your self and we expect perl
53 style methods; call with no args to get and with arg to set.
55 e.g. If we setup our class as follows;
57 package SQL::Translator::Schema::Table;
58 use base qw/SQL::Translator::Schema::Object/;
60 __PACKAGE__->_attributes( qw/schema name/ );
65 Then we can construct it with
67 my $table = SQL::Translator::Schema::Table->new(
72 and init will call C<< $table->name("foo") >> and C<< $table->schema($schema) >>
73 to set it up. Any undefined args will be ignored.
75 Multiple calls to C<_attributes> are cumulative and sub classes will inherit
76 their parents attribute names.
78 This is currently experimental, but will hopefull go on to form an introspection
79 API for the Schema objects.
84 __PACKAGE__->mk_classdata("__attributes");
86 # Define any global attributes here
87 __PACKAGE__->__attributes([qw/extra/]);
89 # Set the classes attribute names. Multiple calls are cumulative.
90 # We need to be careful to create a new ref so that all classes don't end up
91 # with the same ref and hence the same attributes!
94 if (@_) { $class->__attributes( [ @{$class->__attributes}, @_ ] ); }
95 return @{$class->__attributes};
98 # Call accessors for any args in hashref passed
100 my ( $self, $config ) = @_;
102 for my $arg ( $self->_attributes ) {
103 next unless defined $config->{$arg};
104 defined $self->$arg( $config->{$arg} ) or return;
114 =head1 Global Attributes
116 The following attributes are defined here, therefore all schema objects will
121 Get or set the objects "extra" attibutes (e.g., "ZEROFILL" for MySQL fields).
122 Call with no args to get all the extra data.
123 Call with a single name arg to get the value of the named extra attribute,
124 returned as a scalar. Call with a hash or hashref to set extra attributes.
125 Returns a hash or a hashref.
127 $field->extra( qualifier => 'ZEROFILL' );
129 $qualifier = $field->extra('qualifier');
131 %extra = $field->extra;
132 $extra = $field->extra;
137 @_ = %{$_[0]} if ref $_[0] eq "HASH";
138 my $extra = $self->{'extra'} ||= {};
141 return exists($extra->{$_[0]}) ? $extra->{$_[0]} : undef ;
145 while ( my ( $key, $value ) = each %args ) {
146 $extra->{$key} = $value;
150 return wantarray ? %$extra : $extra;
157 L</extra> can only be used to get or set "extra" attributes but not to
158 remove some. Call with no args to remove all extra attributes that
159 have been set before. Call with a list of key names to remove
160 certain extra attributes only.
162 # remove all extra attributes
163 $field->remove_extra();
165 # remove timezone and locale attributes only
166 $field->remove_extra(qw/timezone locale/);
170 my ( $self, @keys ) = @_;
172 $self->{'extra'} = {};
175 delete $self->{'extra'}{$_} for @keys;
185 Determines if this object is the same as another.
187 my $isIdentical = $object1->equals( $object2 );
194 return 0 unless $other;
195 return 1 if overload::StrVal($self) eq overload::StrVal($other);
196 return 0 unless $other->isa( __PACKAGE__ );
200 sub _compare_objects {
204 my $result = (ref_compare($obj1, $obj2) == 0);
206 # use Carp qw(cluck);
207 # cluck("How did I get here?");
209 # $Data::Dumper::Maxdepth = 1;
210 # print "obj1: ", Dumper($obj1), "\n";
211 # print "obj2: ", Dumper($obj2), "\n";
228 Ken Youens-Clark E<lt>kclark@cpan.orgE<gt>,
229 Mark Addison E<lt>mark.addison@itn.co.ukE<gt>.