lib/SQL/Translator/Schema/Graph.pm

   1 package SQL::Translator::Schema::Graph;
   2
   3 use strict;
   4
   5 use base 'Class::Base';
   6
   7 use Data::Dumper;
   8 local $Data::Dumper::Maxdepth = 3;
   9
  10 use SQL::Translator::Schema::Graph::Node;
  11 use SQL::Translator::Schema::Graph::Edge;
  12 use SQL::Translator::Schema::Graph::Port;
  13 use SQL::Translator::Schema::Graph::CompoundEdge;
  14 use SQL::Translator::Schema::Graph::HyperEdge;
  15
  16 use constant Node => 'SQL::Translator::Schema::Graph::Node';
  17 use constant Edge => 'SQL::Translator::Schema::Graph::Edge';
  18 use constant Port => 'SQL::Translator::Schema::Graph::Port';
  19 use constant CompoundEdge => 'SQL::Translator::Schema::Graph::CompoundEdge';
  20 use constant HyperEdge => 'SQL::Translator::Schema::Graph::HyperEdge';
  21
  22 use Class::MakeMethods::Template::Hash (
  23   'new --and_then_init' => 'new',
  24   object => [
  25    'translator' => {class => 'SQL::Translator'},
  26   ],
  27   'hash' => [ qw( node ) ],
  28   'number --counter' => [ qw( order ) ],
  29 );
  30
  31 use vars qw/$DEBUG/;
  32 $DEBUG = 0 unless defined $DEBUG;
  33
  34 sub init {
  35   my $self = shift;
  36
  37   #
  38   # build package objects
  39   #
  40   foreach my $table ($self->translator->schema->get_tables){
  41         die __PACKAGE__." table ".$table->name." doesn't have a primary key!" unless $table->primary_key;
  42         die __PACKAGE__." table ".$table->name." can't have a composite primary key!" if ($table->primary_key->fields)[1];
  43
  44         my $node = Node->new();
  45
  46         $self->node_push($table->name => $node);
  47
  48         if ($table->is_trivial_link) { $node->is_trivial_link(1); }
  49         else { $node->is_trivial_link(0); }
  50
  51         $node->order($self->order_incr());
  52         $node->name( $self->translator->format_package_name($table->name) );
  53         $node->table( $table );
  54         $node->primary_key( ($table->primary_key->fields)[0] );
  55
  56         # Primary key may have a differenct accessor method name
  57         $node->primary_key_accessor(
  58                                                                 defined($self->translator->format_pk_name)
  59                                                                 ? $self->translator->format_pk_name->( $node->name, $node->primary_key )
  60                                                                 : undef
  61                                                            );
  62   }
  63
  64   foreach my $node ($self->node_values){
  65         foreach my $field ($node->table->get_fields){
  66           if (!$field->is_foreign_key && !$field->is_primary_key) { $node->data_fields->{$field->name} = 1; }
  67           elsif($field->is_foreign_key) {
  68           my $that = $self->node($field->foreign_key_reference->reference_table);
  69
  70           #this means we have an incomplete schema
  71           next unless $that;
  72
  73           my $edge = Edge->new(
  74                                                    type => 'import',
  75                                                    thisnode => $node,
  76                                                    thisfield => $field,
  77                                                    thatnode => $that,
  78                                                    #can you believe this sh*t just to get a field obj?
  79                                                    thatfield => $self->translator->schema->get_table($field->foreign_key_reference->reference_table)->get_field(($field->foreign_key_reference->reference_fields)[0])
  80                                                   );
  81
  82           $node->edgecount($that->name, $node->edgecount($that->name)+1);
  83
  84           $node->has($that->name, $node->has($that->name)+1);
  85           $that->many($node->name, $that->many($node->name)+1);
  86
  87           $that->edgecount($node->name, $that->edgecount($node->name)+1);
  88
  89           #warn "\t" . $node->name . "\t" . $node->edgecount($that->name);
  90           $node->push_edges( $edge );
  91           $that->push_edges( $edge->flip );
  92       }
  93         }
  94
  95     #warn Dumper($node->edgecount());
  96     #warn "*****";
  97   }
  98
  99   #
 100   # type MM relationships
 101   #
 102   #foreach linknode
 103   foreach my $lnode (sort $self->node_values){
 104         next if $lnode->table->is_data;
 105         foreach my $inode1 (sort $self->node_values){
 106           #linknode can't link to itself
 107           next if $inode1 eq $lnode;
 108
 109           my @inode1_imports = grep { $_->type eq 'import' and $_->thatnode eq $inode1 } $lnode->edges;
 110           next unless @inode1_imports;
 111
 112           foreach my $inode2 (sort $self->node_values){
 113                 #linknode can't link to itself
 114                 next if $inode2 eq $lnode;
 115
 116                 #identify tables that import keys to linknode
 117                 my %i = map {$_->thatnode->name => 1} grep { $_->type eq 'import'} $lnode->edges;
 118
 119                 if(scalar(keys %i) == 1) {
 120                 } else {
 121                   last if $inode1 eq $inode2;
 122                 }
 123
 124                 my @inode2_imports =  grep { $_->type eq 'import' and $_->thatnode eq $inode2 } $lnode->edges;
 125                 next unless @inode2_imports;
 126
 127                 my $cedge = CompoundEdge->new();
 128                 $cedge->via($lnode);
 129
 130                 #warn join ' ', map {$_->thisfield->name} map {$_->flip} $lnode->edges;
 131                 #warn join ' ', map {$_->thisfield->name} $lnode->edges;
 132                 #warn join ' ', map {$_->thisfield->name} map {$_->flip} grep {$_->type eq 'import'} $lnode->edges;
 133                 #warn join ' ', map {$_->thatfield->name} map {$_->flip} grep {$_->type eq 'import'} $lnode->edges;
 134                 $cedge->push_edges(
 135                                                    map {$_->flip}
 136                                                    grep {$_->type eq 'import'
 137                                                                    and
 138                                                                  ($_->thatnode eq $inode1 or $_->thatnode eq $inode2)
 139                                                             } $lnode->edges
 140                                                   );
 141
 142                 if(scalar(@inode1_imports) == 1 and scalar(@inode2_imports) == 1){
 143                   $cedge->type('one2one');
 144
 145                   $inode1->via($inode2->name,$inode1->via($inode2->name)+1);
 146                   $inode2->via($inode1->name,$inode2->via($inode1->name)+1);
 147                 }
 148                 elsif(scalar(@inode1_imports)  > 1 and scalar(@inode2_imports) == 1){
 149                   $cedge->type('many2one');
 150
 151                   $inode1->via($inode2->name,$inode1->via($inode2->name)+1);
 152                   $inode2->via($inode1->name,$inode2->via($inode1->name)+1);
 153                 }
 154                 elsif(scalar(@inode1_imports) == 1 and scalar(@inode2_imports)  > 1){
 155                   #handled above
 156                 }
 157                 elsif(scalar(@inode1_imports)  > 1 and scalar(@inode2_imports)  > 1){
 158                   $cedge->type('many2many');
 159
 160                   $inode1->via($inode2->name,$inode1->via($inode2->name)+1);
 161                   $inode2->via($inode1->name,$inode2->via($inode1->name)+1);
 162                 }
 163 #warn Dumper($cedge);
 164
 165                 $inode1->push_compoundedges($cedge);
 166                 $inode2->push_compoundedges($cedge) unless $inode1 eq $inode2;
 167 #        if($inode1->name ne $inode2->name){
 168 #          my $flipped_cedge = $cedge;
 169 #          foreach my $flipped_cedge_edge ($flipped_cedge->edges){
 170 #            warn Dumper $flipped_cedge_edge;
 171 #            warn "\t". Dumper $flipped_cedge_edge->flip;
 172 #          }
 173 #        }
 174           }
 175         }
 176   }
 177
 178   my $graph = $self; #hack
 179
 180   #
 181   # create methods
 182   #
 183   # this code needs to move to Graph.pm
 184   foreach my $node_from ($graph->node_values) {
 185
 186     next unless $node_from->table->is_data or !$node_from->table->is_trivial_link;
 187
 188     foreach my $cedge ( $node_from->compoundedges ) {
 189
 190       my $hyperedge = SQL::Translator::Schema::Graph::HyperEdge->new();
 191
 192       my $node_to;
 193       foreach my $edge ($cedge->edges) {
 194         if ($edge->thisnode->name eq $node_from->name) {
 195           $hyperedge->vianode($edge->thatnode);
 196
 197           if ($edge->thatnode->name ne $cedge->via->name) {
 198             $node_to ||= $graph->node($edge->thatnode->table->name);
 199           }
 200
 201           $hyperedge->push_thisnode($edge->thisnode);
 202           $hyperedge->push_thisfield($edge->thisfield);
 203           $hyperedge->push_thisviafield($edge->thatfield);
 204
 205         } else {
 206           if ($edge->thisnode->name ne $cedge->via->name) {
 207             $node_to ||= $graph->node($edge->thisnode->table->name);
 208           }
 209           $hyperedge->push_thatnode($edge->thisnode);
 210           $hyperedge->push_thatfield($edge->thisfield);
 211           $hyperedge->push_thatviafield($edge->thatfield);
 212         }
 213         $self->debug($edge->thisfield->name);
 214         $self->debug($edge->thatfield->name);
 215       }
 216
 217       if ($hyperedge->count_thisnode == 1 and $hyperedge->count_thatnode == 1) {
 218         $hyperedge->type('one2one');
 219       } elsif ($hyperedge->count_thisnode  > 1 and $hyperedge->count_thatnode == 1) {
 220         $hyperedge->type('many2one');
 221       } elsif ($hyperedge->count_thisnode == 1 and $hyperedge->count_thatnode  > 1) {
 222         $hyperedge->type('one2many');
 223       } elsif ($hyperedge->count_thisnode  > 1 and $hyperedge->count_thatnode  > 1) {
 224         $hyperedge->type('many2many');
 225       }
 226
 227       $self->debug($_) foreach sort keys %::SQL::Translator::Schema::Graph::HyperEdge::;
 228
 229       #node_to won't always be defined b/c of multiple edges to a single other node
 230       if (defined($node_to)) {
 231         $self->debug($node_from->name);
 232         $self->debug($node_to->name);
 233
 234         if (scalar($hyperedge->thisnode) > 1) {
 235           $self->debug($hyperedge->type ." via ". $hyperedge->vianode->name);
 236           my $i = 0;
 237           foreach my $thisnode ( $hyperedge->thisnode ) {
 238             $self->debug($thisnode->name .' '.
 239                         $hyperedge->thisfield_index(0)->name .' -> '.
 240                         $hyperedge->thisviafield_index($i)->name .' '.
 241                         $hyperedge->vianode->name .' '.
 242                         $hyperedge->thatviafield_index(0)->name .' <- '.
 243                         $hyperedge->thatfield_index(0)->name .' '.
 244                         $hyperedge->thatnode_index(0)->name ."\n"
 245                        );
 246             $i++;
 247           }
 248         }
 249         #warn Dumper($hyperedge) if $hyperedge->type eq 'many2many';
 250         $node_from->push_hyperedges($hyperedge);
 251       }
 252     }
 253   }
 254
 255 }
 256
 257 1;