/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.23 by joko, Thu Dec 19 16:31:53 2002 UTC revision 1.39 by jonen, Fri Jun 6 11:40:40 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.39  2003/06/06 11:40:40  jonen
7    #  fixed bug at 'getFilteredList'
8    #
9    #  Revision 1.38  2003/05/13 16:38:38  joko
10    #  problems with "tied" on 5.6.1/win32
11    #
12    #  Revision 1.37  2003/05/10 17:37:39  jonen
13    #  corrected last commit
14    #
15    #  Revision 1.36  2003/05/10 17:31:18  jonen
16    #  + added new functions related to 'create' item
17    #   - createNode()
18    #     # creates non-persistent 'deep dummy filled' object
19    #   - insertChildNode()
20    #     # inserts child node at given parent (child node haven't to exists,
21    #         createNode will be injected transparently)
22    #
23    #  Revision 1.35  2003/04/19 16:09:48  jonen
24    #  + added operator dispatching (currently for getting ref-type) at 'getListFiltered'
25    #
26    #  Revision 1.34  2003/04/11 01:18:53  joko
27    #  sendQuery:
28    #  + introduced crud action 'DELETE'
29    #
30    #  Revision 1.33  2003/04/09 06:07:43  joko
31    #  revamped 'sub sendQuery'
32    #
33    #  Revision 1.32  2003/04/08 22:52:22  joko
34    #  modified 'querySchema': better behaviour regarding filtering result
35    #
36    #  Revision 1.31  2003/04/05 21:24:09  joko
37    #  modified 'sub getChildNodes': now contains code from 'querySchema'
38    #
39    #  Revision 1.30  2003/03/27 15:31:14  joko
40    #  fixes to modules regarding new namespace(s) below Data::Mungle::*
41    #
42    #  Revision 1.29  2003/02/21 01:47:18  joko
43    #  purged old code
44    #  minor cosmetics
45    #
46    #  Revision 1.28  2003/02/20 20:20:26  joko
47    #  tried to get auto-disconnect working again - failed with that
48    #
49    #  Revision 1.27  2003/01/31 06:30:59  joko
50    #  + enabled 'sendQuery'
51    #
52    #  Revision 1.26  2003/01/30 22:29:47  joko
53    #  + fixed module usage (removed dependency on 'libp.pm')
54    #
55    #  Revision 1.25  2003/01/19 02:30:05  joko
56    #  + fix: modified call to '_initSchema'
57    #
58    #  Revision 1.24  2002/12/22 14:13:01  joko
59    #  + sub dropDb
60    #
61  #  Revision 1.23  2002/12/19 16:31:53  joko  #  Revision 1.23  2002/12/19 16:31:53  joko
62  #  +- renamed sub to 'rebuildDb'  #  +- renamed sub to 'rebuildDb'
63  #  #
# Line 29  Line 84 
84  #  + fix: encapsulated object-loading inside an 'eval'  #  + fix: encapsulated object-loading inside an 'eval'
85  #  #
86  #  Revision 1.15  2002/12/05 13:55:21  joko  #  Revision 1.15  2002/12/05 13:55:21  joko
87  #  + now utilizing 'object2hash' instead of 'var_deref'  #  + now utilizing 'expand' instead of 'var_deref'
88  #  + played around with having fresh-objects - no progress....  #  + played around with having fresh-objects - no progress....
89  #  #
90  #  Revision 1.14  2002/12/05 09:40:30  jonen  #  Revision 1.14  2002/12/05 09:40:30  jonen
# Line 102  use warnings; Line 157  use warnings;
157  use base ("Data::Storage::Handler");  use base ("Data::Storage::Handler");
158  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
159    
160  use Tangram;  
161  use Data::Dumper;  use Data::Dumper;
162  use libp qw( getNewPerlObjectByPkgName );  use Tangram;
 use Data::Storage::Result::Tangram;  
 use Data::Compare::Struct qw( isEmpty );  
 use Data::Transform::Deep qw( object2hash );  
 use Data::Transform::Encode qw( var2utf8 );  
163    
164    use DesignPattern::Object;
165    use Data::Storage::Result::Tangram;
166    use Data::Mungle::Compare::Struct qw( isEmpty );
167    use Data::Mungle::Transform::Deep qw( expand deep_copy merge_to );
168    
169  # get logger instance  # get logger instance
170  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
# Line 130  sub _initSchema { Line 185  sub _initSchema {
185    my $self = shift;    my $self = shift;
186    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
187    #if (!$schema_tangram) {    #if (!$schema_tangram) {
188      my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );      #my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
189        my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
190      $schema_tangram = $obj->getSchema();      $schema_tangram = $obj->getSchema();
191    #}    #}
192    if (!$schema_tangram) {    if (!$schema_tangram) {
# Line 163  sub connect { Line 219  sub connect {
219      my $self = shift;      my $self = shift;
220            
221      my $dsn = shift;      my $dsn = shift;
222    
223    #print Dumper($self);
224    #exit;
225    
226        # TODO: re-enable
227      $dsn ||= $self->{locator}->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
       
228      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
229            
230      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
# Line 176  sub connect { Line 236  sub connect {
236  #      return;  #      return;
237  #    }  #    }
238    
239      return unless $self->_initSchema();      #return unless $self->_initSchema();
240        $self->_initSchema();
241    
242      # create the main tangram storage object      # create the main tangram storage object
243      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
# Line 203  sub connect { Line 264  sub connect {
264  sub getChildNodes {  sub getChildNodes {
265    
266    my $self = shift;    my $self = shift;
267    my @nodes;    my $mode = shift;
268      my $filter = shift;
269      
270      $mode ||= 'core';
271      $filter ||= 'all';
272      
273      $logger->debug( __PACKAGE__ . "->getChildNodes($mode)" );
274    
275    $logger->debug( __PACKAGE__ . "->getChildNodes()" );    if ($mode eq 'core') {
276    
277    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE      my @nodes;
278    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });      
279    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );      # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
280          #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
281    # todo: should we retrieve information from the schema here      #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
282    # rather than poorly getting table names from underlying dbi?      
283    my $storage = $self->_getSubLayerHandle();      # todo: should we retrieve information from the schema here
284    @nodes = @{$storage->getChildNodes()};      # rather than poorly getting table names from underlying dbi?
285    #$storage->_configureCOREHANDLE();      my $storage = $self->_getSubLayerHandle();
286  #print "getchildnodes\n";      @nodes = @{$storage->getChildNodes()};
287  #print Dumper($self);      #$storage->_configureCOREHANDLE();
288    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #print "getchildnodes\n";
289      #print Dumper($self);
290        #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
291        
292        # TODO: REVIEW
293        #$storage->disconnect();
294        
295        $self->{meta}->{childnodes} = \@nodes;
296    
297        return \@nodes;
298        
299    # TODO: REVIEW    } elsif ($mode eq 'root') {
300    #$storage->disconnect();      
301        # FIXME: this will return *all* known classes to 'Class::Tangram',
302        # which might not be what you expect since more than one instance
303        # of Tangram may be in memory and Class::Tangram seems to
304        # offer no methods to determine this or filter its result(s) according
305        # to a specific database.
306        my @object_names = Class::Tangram::known_classes();
307        my @concret_names;
308        my $o_cnt;
309        foreach (sort @object_names) {
310          push @concret_names, $_  if (!Class::Tangram::class_is_abstract($_));
311          $o_cnt++;
312        }
313    
314        if ($filter eq 'all') {
315          return \@object_names;
316        } elsif ($filter eq 'concrete') {
317          return \@concret_names;
318        }
319        
320    $self->{meta}->{childnodes} = \@nodes;    }
321        
   return \@nodes;  
322    
323  }  }
324    
   
325  sub testIntegrity {  sub testIntegrity {
326    
327    my $self = shift;    my $self = shift;
# Line 303  sub configureCOREHANDLE { Line 395  sub configureCOREHANDLE {
395    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
396    
397    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
398      #print Dumper($self);
399      #exit;
400    
401    # apply configured modifications    # apply configured modifications
402      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
# Line 410  sub getListFiltered { Line 504  sub getListFiltered {
504    my @results;    my @results;
505    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
506    
507    #print Dumper($filters);  #print Dumper($filters);
508        
509    my @tfilters;    my @tfilters;
510        
# Line 432  sub getListFiltered { Line 526  sub getListFiltered {
526    #    objects => $objects,    #    objects => $objects,
527    #  );    #  );
528        
529      # HACK: build eval-string (sorry) to get filtered list - please give advice here      # TODO: is_op?
530      push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";      # dispatch un-common operators if exists
531        if($filter->{op} eq "ref") {
532          # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query
533          #print "Filter->op eq 'ref'.\n";
534          #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
535        } else {
536          # HACK: build eval-string (sorry) to get filtered list - please give advice here
537          push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
538        }
539    
540    }    }
541    
# Line 449  sub getListFiltered { Line 551  sub getListFiltered {
551    # HACK: build eval-string (sorry) to get filtered list - please give advice here    # HACK: build eval-string (sorry) to get filtered list - please give advice here
552    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
553        
554      #print "eval: $evalstring", "\n";
555      
556    # get filtered list/set    # get filtered list/set
557    @results = eval($evalstring);    @results = eval($evalstring);
558    die $@ if $@;    die $@ if $@;
559        
560    
561      # filter results
562      if($filters->[0]->{op} eq "ref") {
563          #print "Filter->op eq 'ref'.\n";
564          my $att_name = $filters->[0]->{key};
565          my $att_val = $filters->[0]->{val};
566          my @filtered;
567          foreach(@results) {
568            if(ref($_->{$att_name}) eq $att_val) {
569              push @filtered, $_;
570            }
571          }
572          @results = @filtered;
573      }
574    
575      #print "results: " . Dumper(\@results);
576      
577    return \@results;    return \@results;
578  }  }
579    
# Line 484  sub createSet { Line 605  sub createSet {
605  sub sendQuery {  sub sendQuery {
606    my $self = shift;    my $self = shift;
607    my $query = shift;    my $query = shift;
   #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";  
   #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);  
608    
609    #print Dumper($query);    #print Dumper($query);
610    
611    # HACK: special case: querying by id does not translate into a common tangram query    # type = ITEM|LIST|TRANSPARENT
612    # just load the object by given id(ent)    my $type = '';
613    if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {    # mode = OID|SPECIAL
614      #print "LOAD!!!", "\n";    my $mode = '';
615      #exit;    my $ident = '';
616      #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );    my $crud = '';
617      my $ident = $query->{criterias}->[0]->{val};    
618  #print "load obj", "\n";    
619      #return $self->createSet() if $ident == 5;    # dispatch type and mode
620      $self->{_COREHANDLE}->unload($ident);    
621      my $object = $self->{_COREHANDLE}->load($ident);      # defaults - 1
622  #print "get id", "\n";      if ($query->{options}) {
623      my $oid = $self->{_COREHANDLE}->id($object);        $crud = $query->{options}->{crud};
624  #print Dumper($object);        $crud ||= $query->{options}->{action};
625  #print "oid: $oid", "\n";      }
626      return $self->createSet($object);  
627      #return $self->createSet( $self->{COREHANDLE}->load('300090018') );      # defaults - 2
628    }      $type ||= 'TRANSPARENT';
629        $crud ||= 'RETRIEVE';
630    die("This should not be reached for now - redirect to \$self->getListFiltered() here!");  
631        if ($query->{options}->{OID}) {
632    # TODO: do a common tangram query here        $type = 'ITEM';
633          $mode = 'OID';
634    my @crits;        $ident = $query->{options}->{OID};
635    foreach (@{$query->{criterias}}) {      
636      my $op = '';      } elsif (my $guid = $query->{options}->{GUID}) {
637      $op = '=' if lc $_->{op} eq 'eq';        $type = 'TRANSPARENT';
638      push @crits, "$_->{key}$op'$_->{val}'";        $query->{criterias} = [ { key => 'guid', op => 'eq', val => $guid } ];    
639    }  
640    my $subnodes = {};      # if operator is different (dispatcher for 'getListFiltered')
641    map { $subnodes->{$_}++ } @{$query->{subnodes}};      } elsif (my $op = $query->{options}->{op}) {
642    # HACK: this is hardcoded ;(    expand possibilities!        $type = 'TRANSPARENT';
643    #my $crit = join(' AND ', @crits);        $query->{criterias} = [ { key => $query->{options}->{meta_label}, op => $op, val => $query->{options}->{meta_value} } ];    
644    #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);  
645    #return $self->sendCommand($sql);      }
646    #my $h = $self->{COREHANDLE}->remote($query->{node});    
647    #my $res = $self->{COREHANDLE}->select($h, $h->{);      # HACK: special case: querying by id does not translate into a common tangram query
648    return $self->createCursor($query->{node});      # just load the object by given identifier (OID) named 'id' - this is required by Data::Transfer::Sync!
649        if ($query->{criterias} && ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq')) {
650          $type = 'ITEM';
651          $mode = 'SPECIAL.SYNC';
652          $ident = $query->{criterias}->[0]->{val};
653        }
654      
655    
656      # execute query
657      my $result;
658    
659      if ($type eq 'ITEM' && $ident) {
660    
661        if ($mode eq 'OID') {    
662          # TODO: review this case!
663          $result = $self->getObject($ident, $query->{options});
664        
665        } elsif ($mode eq 'SPECIAL.SYNC') {
666    
667          # V1 - failed
668          #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
669      
670          # hmm....
671          #return $self->createSet() if $ident == 5;
672          
673          # Unload single object before doing any further operations to
674          # expect a "fresh" object from orm when performing the next calls.
675          $self->{_COREHANDLE}->unload($ident);
676          
677          # Load object from orm.
678          my $object = $self->{_COREHANDLE}->load($ident);
679      
680          # determine object identifier (OID)
681          my $oid = $self->{_COREHANDLE}->id($object);
682          
683          # encapsulate into result/response container and return this one
684          $result = $self->createSet($object);
685          
686          # debugging
687          #$result = $self->createSet( $self->{COREHANDLE}->load('300090018') );
688    
689        }
690        
691      
692      } elsif ($type eq 'TRANSPARENT') {
693    
694        if ($crud eq 'RETRIEVE') {
695    
696          my $list = $self->getListFiltered($query->{node}, $query->{criterias});
697          #return $self->createSet($object);
698          #return $self->createSet($list);
699          return $self->createSet(@$list);
700        
701          #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
702        
703          # try a generic tangram query here
704          # TODO: try to place an oql on top of that (search.cpan.org!)
705          my @crits;
706          foreach (@{$query->{criterias}}) {
707            my $op = '';
708            $op = '=' if lc $_->{op} eq 'eq';
709            push @crits, "$_->{key}$op'$_->{val}'";
710          }
711          my $subnodes = {};
712          map { $subnodes->{$_}++ } @{$query->{subnodes}};
713          # HACK: this is hardcoded ;(    expand possibilities!
714          #my $crit = join(' AND ', @crits);
715          #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
716          #return $self->sendCommand($sql);
717          #my $h = $self->{COREHANDLE}->remote($query->{node});
718          #my $res = $self->{COREHANDLE}->select($h, $h->{);
719          $result = $self->createCursor($query->{node});
720    
721        } elsif ($crud eq 'UPDATE') {
722    
723          # Patch current query to be a loader (e.g. change action, remove payload) ...
724          my $childquery = deep_copy($query);
725          $childquery->{options}->{crud} = 'RETRIEVE';
726          delete $childquery->{payload};
727    
728          # ... to use it to fetch a fresh object using ourselves (sendQuery).
729          my $cursor = $self->sendQuery($childquery);
730          my $status = $cursor->getStatus();
731          my $object = $cursor->getNextEntry();
732    
733          # Merge values and apply value modifiers.
734          my $options = { utf8 => 1, php => 1 };
735          merge_to($object, $query->{payload}, $options);
736    
737          # Execute update operation at orm.
738          $self->update($object);
739        
740        } elsif ($crud eq 'DELETE') {
741    
742          # Patch current query to be a loader (e.g. change action) ...
743          my $childquery = deep_copy($query);
744          $childquery->{options}->{crud} = 'RETRIEVE';
745    
746          # ... to use it to fetch a fresh object using ourselves (sendQuery).
747          my $cursor = $self->sendQuery($childquery);
748          my $status = $cursor->getStatus();
749          my $object = $cursor->getNextEntry();
750    
751          $self->erase($object);
752    
753        } elsif ($crud eq 'CREATE') {
754          
755          my $nodename = $query->{node};      
756          my $newnode = $self->createNode($nodename);
757          my $id = $self->{_COREHANDLE}->insert($newnode);
758      
759          print "Saved new node $nodename with GUID $newnode->{guid}, OID '$id': " . Dumper($newnode) . "\n";
760          
761          return $newnode;
762    
763        }
764    
765      }
766    
767      return $result;
768    
769  }  }
770    
771  sub eraseAll {  sub eraseAll {
# Line 562  sub getObject { Line 801  sub getObject {
801    return $object if $object;    return $object if $object;
802  }  }
803    
804  sub getObjectByGuid {  sub getObjectByGuid_old {
805    my $self = shift;    my $self = shift;
806    my $guid = shift;    my $guid = shift;
807    my $options = shift;    my $options = shift;
# Line 592  sub getObjectByGuid { Line 831  sub getObjectByGuid {
831        
832  }  }
833    
834  sub getObjectAsHash {  sub getObjectAsHash_old {
835    my $self = shift;    my $self = shift;
836    my $oid = shift;    my $oid = shift;
837    my $options = shift;      my $options = shift;  
# Line 607  sub getObjectAsHash { Line 846  sub getObjectAsHash {
846    # build options (a callback to unload autovivified objects) for 'expand'    # build options (a callback to unload autovivified objects) for 'expand'
847    # TODO: use $logger to write to debug here!    # TODO: use $logger to write to debug here!
848    my $cb; # = sub {};    my $cb; # = sub {};
849    
850      # deactivated way to get rid of used instances, if requested
851  =pod  =pod
852    if ($options->{destroy}) {      if ($options->{destroy}) {
853      $options->{cb}->{destroy} = sub {        $options->{cb}->{destroy} = sub {
854        print "================ DESTROY", "\n";          print "================ DESTROY", "\n";
855        my $object = shift;          my $object = shift;
856        #print Dumper($object);          #print Dumper($object);
857        $self->{_COREHANDLE}->unload($object);          $self->{_COREHANDLE}->unload($object);
858        #undef($object);          #undef($object);
859      };        };
860    }      }
861  =cut  =cut
862    
863    my $hash = object2hash($obj, $options);    my $hash = expand($obj, $options);
864    #$options->{cb}->{destroy}->($obj);  
865    #$self->{_COREHANDLE}->unload($obj);    # old (unsuccessful) attempts to get rid of used instances, if requested
866      
867    # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML      # V1:
868    # now done in object2hash      #$options->{cb}->{destroy}->($obj);
869    #var2utf8($hash) if ($options->{utf8});      #$self->{_COREHANDLE}->unload($obj);
870        
871    # old (wrong) attempts to get rid of used instances, if requested      # V2:
872      #$obj->clear_refs;      #$obj->clear_refs;
873      #$self->{COREHANDLE}->unload($obj) if($options->{destroy});      #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
874      #$obj->DESTROY;      #$obj->DESTROY;
# Line 645  sub getCOREHANDLE { Line 886  sub getCOREHANDLE {
886    return $self->{_COREHANDLE};    return $self->{_COREHANDLE};
887  }  }
888    
889    sub dropDb {
890      my $self = shift;
891      my $storage = $self->_getSubLayerHandle();
892      return $storage->dropDb();
893    }
894    
895    sub testAvailability {
896      my $self = shift;
897      my $storage = $self->_getSubLayerHandle();
898      return $storage->testAvailability();
899    }
900    
901    sub disconnect2 {
902      my $self = shift;
903      my $storage = $self->_getSubLayerHandle();
904      print "DISC!", "\n";
905    
906      my $storage_ll = $storage->{_COREHANDLE};
907      $storage_ll->disconnect();
908      
909      print Dumper($storage);
910      exit;
911      
912      #$self->{_COREHANDLE}
913      #$storage->disconnect();
914      $self->{dataStorageLayer}->disconnect();
915    }
916    
917    
918    sub createNode {
919      my $self = shift;
920      my $classname = shift;
921    
922      my $obj = $classname->new();
923      
924      my $attr_options = Class::Tangram::attribute_options($classname);
925      #print "Attribute Options: " . Dumper($attr_options);
926    
927      my $attr_types = Class::Tangram::attribute_types($classname);
928      #print "Attribute Types: " . Dumper($attr_types);
929      
930      foreach(keys %{$attr_types}) {
931        if($attr_types->{$_} eq 'string') {
932          $obj->{$_} = '';
933        } elsif($attr_types->{$_} eq 'int') {
934          $obj->{$_} = 0;
935        } elsif($attr_types->{$_} eq 'real') {
936          $obj->{$_} = 0;
937        } elsif($attr_types->{$_} eq 'rawdatetime') {
938          $obj->{$_} = '0000-00-00 00:00:00';
939        } elsif($attr_types->{$_} eq 'ref') {
940          if($attr_options->{$_}->{class}) {
941            $obj->{$_} = $self->createNode($attr_options->{$_}->{class});
942          } else {
943            #$obj->{$_} = undef();
944          }
945        } elsif($attr_types->{$_} eq 'iarray') {
946            $obj->{$_} = [ ];
947        } elsif($attr_types->{$_} eq 'hash') {
948            $obj->{$_} = {  };
949        } elsif($attr_types->{$_} eq 'flat_hash') {
950            $obj->{$_} = { };
951        }
952      }
953      
954      #print "New Object: " . Dumper($obj);
955      
956      return $obj;
957    }
958    
959    
960      sub insertChildNode {
961        my $self = shift;
962        my $child_entry = shift;
963        my $query_args = shift;
964        
965        my $core = $self->{_COREHANDLE};
966        my $nodename = $query_args->{nodename};
967        
968        # get parent object
969        my $query = {
970              node => $query_args->{parent}->{nodename},
971              options => { GUID => $query_args->{parent}->{guid}, },
972              };
973        my $cursor = $self->sendQuery($query);
974        my $parent = $cursor->getNextEntry();
975    
976        # debug
977        #print "Parent_org: " . Dumper($parent);
978            
979        # Create child node object if isn't already done
980        # ($child_entry have to be the class name then...)
981        if(!ref($child_entry)) {
982          $child_entry = $self->createNode($child_entry);
983          # it could be insert 'manually' or will be insert 'transparent' if parent will be updated
984          #$core->insert($child_entry);
985          #print "Create child object [$nodename]: " . Dumper($child_entry);
986        }
987    
988        # get reference of tied node (seems, only on Linux node's are tied!!)
989        my $tied_node = tied $parent->{$nodename};
990    
991        # insert/change child entry at parent
992        #print "reference: " . ref($parent->{$nodename}) . "\n";
993        if(ref($parent->{$nodename}) eq 'ARRAY') {
994          # (seems, only on Linux node's are tied!!)
995          if($tied_node) {
996            # all tangram types are tied as 'SCALAR' with special 'FETCH', 'STORE' methods per type,
997            # so a 'PUSH' is not implemented (which could be then done transparently)
998            my $array = $tied_node->FETCH;
999            push @$array, $child_entry;
1000            $tied_node->STORE($array);
1001            # node will be normaly untied at 'STORE'
1002            if(tied $parent->{$nodename}) { print "already tied !!\n"; }
1003            else { undef $tied_node; }
1004          } else {
1005            push @{$parent->{$nodename}}, $child_entry;
1006          }
1007        }
1008        elsif(ref($parent->{$nodename}) eq 'HASH') {
1009          if(my $key = $query_args->{hash_key}) {
1010            # (seems, only on Linux node's are tied!!)
1011            if($tied_node) {
1012              # same problem as with 'ARRAY':
1013              # all tangram types are tied as 'SCALAR' with special 'FETCH', 'STORE' methods per type.
1014              my $hash = $tied_node->FETCH;
1015              $hash->{$key} = $child_entry;
1016              $tied_node->STORE($hash);
1017              # node will be normaly untied at 'STORE'
1018              if(tied $parent->{$nodename}) { print "already tied !!\n"; }
1019              else { undef $tied_node; }
1020            } else {
1021              $parent->{$nodename}->{$key} = $child_entry;
1022            }
1023          } else {
1024           print "ERROR: No HASH KEY given, so not able to insert hash entry!";
1025          }
1026        }
1027        else {
1028          $parent->{$nodename} = $child_entry;
1029        }
1030    
1031        # debug
1032        #print "Parent_new: " . Dumper($parent);
1033        
1034        # save parent
1035        $core->update($parent);
1036        
1037        # debug
1038        #print "Saved Parent: ". Dumper($parent);
1039        
1040        return $child_entry;
1041      }
1042    
1043    
1044  1;  1;
1045    __END__
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