From: Aran Deltac <bluefeet@cpan.org>
Date: Fri, 24 Mar 2006 20:30:10 +0000 (+0000)
Subject: New experimental TokenGroup component.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=10ab032259bd999d77762e1b4966763193f704ce;p=dbsrgits%2FDBIx-Class-Historic.git

New experimental TokenGroup component.
---

diff --git a/lib/DBIx/Class/Manual/Component.pod b/lib/DBIx/Class/Manual/Component.pod
index 1107639..7c92b4f 100644
--- a/lib/DBIx/Class/Manual/Component.pod
+++ b/lib/DBIx/Class/Manual/Component.pod
@@ -46,6 +46,8 @@ L<DBIx::Class::HTMLWidget> - Like FromForm but with DBIx::Class and HTML::Widget
 
 L<DBIx::Class::PK::Auto> - Retrieve automatically created primary keys upon insert.
 
+L<DBIx::Class::Positional> - Modify the position of objects in an ordered list.
+
 L<DBIx::Class::QueriesTime> - Display the amount of time it takes to run queries.
 
 L<DBIx::Class::RandomStringColumns> - Declare virtual columns that return random strings.
@@ -68,12 +70,12 @@ L<DBIx::Class::Serialize::Storable> - Hooks for Storable freeze/thaw.
 
 L<DBIx::Class::Validation> - Validate all data before submitting to your database.
 
-L<DBIx::Class::Positional> - Modify the position of objects in an ordered list.
-
 L<DBIx::Class::Tree::AdjacencyList> - Manage a tree of data using the common adjacency list model.
 
 L<DBIx::Class::Tree::NestedSet> - Manage a positional tree of data using the nested set model.
 
+L<DBIx::Class::TokenGroup> - Search for tokens in a tree of groups.
+
 =head2 Core
 
 These are the components that all, or nearly all, people will use 
diff --git a/lib/DBIx/Class/TokenGroup.pm b/lib/DBIx/Class/TokenGroup.pm
new file mode 100644
index 0000000..8f59413
--- /dev/null
+++ b/lib/DBIx/Class/TokenGroup.pm
@@ -0,0 +1,213 @@
+package DBIx::Class::TokenGroup;
+use strict;
+use warnings;
+
+use base qw( DBIx::Class );
+
+=head1 NAME
+
+DBIx::Class::TokenGroup - Search for tokens in a tree of groups. (EXPERIMENTAL)
+
+=head1 SYNOPSIS
+
+Define your user tokens class.
+
+  package Schema::User::Token;
+  use base qw( DBIx::Class::Core );
+  __PACKAGE__->table('user_tokens');
+  __PACKAGE__->add_columns(qw( name user_id value ));
+  __PACKAGE__->set_primary_key(qw( name user_id ));
+  1;
+
+Define your group tokens class.
+
+  package Schema::Group::Token;
+  use base qw( DBIx::Class::Core );
+  __PACKAGE__->table('group_tokens');
+  __PACKAGE__->add_columns(qw( name group_id value ));
+  __PACKAGE__->set_primary_key(qw( name group_id ));
+  1;
+
+Define your group class.
+
+  package Schema::Group;
+  use base qw( DBIx::Class::Core );
+  __PACKAGE__->load_components(qw(
+    Tree::AdjacencyList
+  ));
+  __PACKAGE__->table('groups');
+  __PACKAGE__->add_columns(qw( group_id parent_id ));
+  __PACKAGE__->set_primary_key('group_id');
+  __PACKAGE__->parent_column('parent_id');
+  __PACKAGE__->has_many( 'tokens' => 'Group::Token' => 'group_id' );
+  1;
+
+Define your user class.
+
+  package Schema::User;
+  use base qw( DBIx::Class::Core );
+  __PACKAGE__->table('users');
+  __PACKAGE__->add_columns(qw( user_id group_id ));
+  __PACKAGE__->set_primary_key('user_id');
+  __PACKAGE__->token_name_column('name');
+  __PACKAGE__->token_value_column('value');
+  __PACKAGE__->has_many( 'tokens' => 'User::Token' => 'user_id' );
+  __PACKAGE__->belongs_to( 'group' => 'Group', { 'foreign.group_id' => 'self.group_id' } );
+  1;
+
+=head1 DESCRIPTION
+
+This L<DBIx::Class> component provides several utilities for 
+retrieving tokens for a tree of groups.  A token is, at a minimum, 
+a name and a value.  Groups are associated using either 
+L<DBIx::Class::Tree::AdjacencyList> or L<DBIx::Class::Tree::NestedSet>.
+
+This component itself is fairly simple, but it requires that you 
+structure your classes in a certain way.
+
+=head1 REQUIREMENTS
+
+The sample shown in the SYNOPSIS is just that, an example.  
+As long your clases respond the way that this component 
+expects it doesn't care how things are structure.  So, here 
+are the requirements for the class that uses this component.
+
+=over 4
+
+=item *
+
+A tokens() method that returns a DBIx::Class::ResultSet object.  The 
+objects (tokens) that the result set returns must have the name and 
+value columns that you specified with the...
+
+=item *
+
+TODO
+
+=back
+
+=head1 METHODS
+
+=head2 token_name_column
+
+  __PACKAGE__->token_name_column('name');
+
+Sets the name of the column that can be queried to 
+retrieve a token's name.
+
+=cut
+
+__PACKAGE__->mk_classdata( 'token_name_column' => 'name' );
+
+=head2 token_value_column
+
+  __PACKAGE__->token_value_column('value');
+
+Sets the name of the column that can be queried to 
+retrieve a token's value.  This settings is optional 
+as long as you do not use the token_true() and 
+token_false() methods.
+
+=cut
+
+__PACKAGE__->mk_classdata( 'token_value_column' => 'value' );
+
+=head2 token
+
+  $object->token('name');
+
+Returns the token object, or 0 if none was found.
+
+=cut
+
+sub token {
+    my( $self, $name ) = @_;
+    my $name_col = $self->token_name_column();
+    my $token = $self->tokens->search({
+        $name_col => $name
+    })->all();
+    return $token if ($token);
+    $token = $self->group->tokens->search({
+        $name_col => $name
+    })->all();
+    return $token if ($token);
+    my $descendant = $self->group->descendant_by_depth();
+    while (my $group = $descendant->next()) {
+        $token = $group->tokens->search({
+            $name_col => $name
+        })->all();
+        return $token if ($token);
+    }
+    return 0;
+}
+
+=head2 token_exists
+
+  if ($object->token_exists('name')){ ... }
+
+Tests whether there is a token defined of the 
+specified name.
+
+=cut
+
+sub token_exists {
+    my( $self, $name ) = @_;
+    my $name_col = $self->token_name_column();
+    return 1 if( $self->tokens->search({
+        $name_col => $name
+    })->count() );
+    return 1 if( $self->group->tokens->search({
+        $name_col => $name
+    })->count() );
+    my $ancestors = $self->group->ancestors_by_depth();
+    while (my $group = $ancestors->next()) {
+        return 1 if( $group->tokens->search({
+            $name_col => $name
+        })->count() );
+    }
+    return 0;
+}
+
+=head2 token_true
+
+  if ($object->token_true('name')) {
+
+Returns 1 if the token exists and its value is a 
+true value.  Returns 0 otherwise.
+
+=cut
+
+sub token_true {
+    my( $self, $name ) = @_;
+    my $token = $self->token( $name );
+    return 0 if(!$token);
+    return ( $token->get_column($self->token_value_column()) ? 1 : 0 );
+}
+
+=head2 token_false
+
+  if ($object->token_false('name')) {
+
+Returns 1 if the token exists and its value is a 
+false value.  Returns 0 otherwise.
+
+=cut
+
+sub token_false {
+    my( $self, $name ) = @_;
+    my $token = $self->token( $name );
+    return 0 if(!$token);
+    return ( $token->get_column($self->token_value_column()) ? 0 : 1 );
+}
+
+1;
+__END__
+
+=head1 AUTHOR
+
+Aran Clary Deltac <bluefeet@cpan.org>
+
+=head1 LICENSE
+
+You may distribute this code under the same terms as Perl itself.
+