/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.22 by jonen, Wed Dec 18 22:28:16 2002 UTC revision 1.36 by jonen, Sat May 10 17:31:18 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.36  2003/05/10 17:31:18  jonen
7    #  + added new functions related to 'create' item
8    #   - createNode()
9    #     # creates non-persistent 'deep dummy filled' object
10    #   -
11    #
12    #  Revision 1.35  2003/04/19 16:09:48  jonen
13    #  + added operator dispatching (currently for getting ref-type) at 'getListFiltered'
14    #
15    #  Revision 1.34  2003/04/11 01:18:53  joko
16    #  sendQuery:
17    #  + introduced crud action 'DELETE'
18    #
19    #  Revision 1.33  2003/04/09 06:07:43  joko
20    #  revamped 'sub sendQuery'
21    #
22    #  Revision 1.32  2003/04/08 22:52:22  joko
23    #  modified 'querySchema': better behaviour regarding filtering result
24    #
25    #  Revision 1.31  2003/04/05 21:24:09  joko
26    #  modified 'sub getChildNodes': now contains code from 'querySchema'
27    #
28    #  Revision 1.30  2003/03/27 15:31:14  joko
29    #  fixes to modules regarding new namespace(s) below Data::Mungle::*
30    #
31    #  Revision 1.29  2003/02/21 01:47:18  joko
32    #  purged old code
33    #  minor cosmetics
34    #
35    #  Revision 1.28  2003/02/20 20:20:26  joko
36    #  tried to get auto-disconnect working again - failed with that
37    #
38    #  Revision 1.27  2003/01/31 06:30:59  joko
39    #  + enabled 'sendQuery'
40    #
41    #  Revision 1.26  2003/01/30 22:29:47  joko
42    #  + fixed module usage (removed dependency on 'libp.pm')
43    #
44    #  Revision 1.25  2003/01/19 02:30:05  joko
45    #  + fix: modified call to '_initSchema'
46    #
47    #  Revision 1.24  2002/12/22 14:13:01  joko
48    #  + sub dropDb
49    #
50    #  Revision 1.23  2002/12/19 16:31:53  joko
51    #  +- renamed sub to 'rebuildDb'
52    #
53  #  Revision 1.22  2002/12/18 22:28:16  jonen  #  Revision 1.22  2002/12/18 22:28:16  jonen
54  #  + added extended logging at 'getObjectByGuid()'  #  + added extended logging at 'getObjectByGuid()'
55  #  #
# Line 26  Line 73 
73  #  + fix: encapsulated object-loading inside an 'eval'  #  + fix: encapsulated object-loading inside an 'eval'
74  #  #
75  #  Revision 1.15  2002/12/05 13:55:21  joko  #  Revision 1.15  2002/12/05 13:55:21  joko
76  #  + now utilizing 'object2hash' instead of 'var_deref'  #  + now utilizing 'expand' instead of 'var_deref'
77  #  + played around with having fresh-objects - no progress....  #  + played around with having fresh-objects - no progress....
78  #  #
79  #  Revision 1.14  2002/12/05 09:40:30  jonen  #  Revision 1.14  2002/12/05 09:40:30  jonen
# Line 99  use warnings; Line 146  use warnings;
146  use base ("Data::Storage::Handler");  use base ("Data::Storage::Handler");
147  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
148    
149  use Tangram;  
150  use Data::Dumper;  use Data::Dumper;
151  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 );  
152    
153    use DesignPattern::Object;
154    use Data::Storage::Result::Tangram;
155    use Data::Mungle::Compare::Struct qw( isEmpty );
156    use Data::Mungle::Transform::Deep qw( expand deep_copy merge_to );
157    
158  # get logger instance  # get logger instance
159  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
# Line 127  sub _initSchema { Line 174  sub _initSchema {
174    my $self = shift;    my $self = shift;
175    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
176    #if (!$schema_tangram) {    #if (!$schema_tangram) {
177      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} } );
178        my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
179      $schema_tangram = $obj->getSchema();      $schema_tangram = $obj->getSchema();
180    #}    #}
181    if (!$schema_tangram) {    if (!$schema_tangram) {
# Line 160  sub connect { Line 208  sub connect {
208      my $self = shift;      my $self = shift;
209            
210      my $dsn = shift;      my $dsn = shift;
211    
212    #print Dumper($self);
213    #exit;
214    
215        # TODO: re-enable
216      $dsn ||= $self->{locator}->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
       
217      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
218            
219      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
# Line 173  sub connect { Line 225  sub connect {
225  #      return;  #      return;
226  #    }  #    }
227    
228      return unless $self->_initSchema();      #return unless $self->_initSchema();
229        $self->_initSchema();
230    
231      # create the main tangram storage object      # create the main tangram storage object
232      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
# Line 200  sub connect { Line 253  sub connect {
253  sub getChildNodes {  sub getChildNodes {
254    
255    my $self = shift;    my $self = shift;
256    my @nodes;    my $mode = shift;
257      my $filter = shift;
258      
259      $mode ||= 'core';
260      $filter ||= 'all';
261      
262      $logger->debug( __PACKAGE__ . "->getChildNodes($mode)" );
263    
264    $logger->debug( __PACKAGE__ . "->getChildNodes()" );    if ($mode eq 'core') {
265    
266    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE      my @nodes;
267    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });      
268    #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
269          #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
270    # todo: should we retrieve information from the schema here      #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
271    # rather than poorly getting table names from underlying dbi?      
272    my $storage = $self->_getSubLayerHandle();      # todo: should we retrieve information from the schema here
273    @nodes = @{$storage->getChildNodes()};      # rather than poorly getting table names from underlying dbi?
274    #$storage->_configureCOREHANDLE();      my $storage = $self->_getSubLayerHandle();
275  #print "getchildnodes\n";      @nodes = @{$storage->getChildNodes()};
276  #print Dumper($self);      #$storage->_configureCOREHANDLE();
277    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #print "getchildnodes\n";
278      #print Dumper($self);
279        #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
280        
281        # TODO: REVIEW
282        #$storage->disconnect();
283        
284        $self->{meta}->{childnodes} = \@nodes;
285    
286        return \@nodes;
287        
288    # TODO: REVIEW    } elsif ($mode eq 'root') {
289    #$storage->disconnect();      
290        # FIXME: this will return *all* known classes to 'Class::Tangram',
291        # which might not be what you expect since more than one instance
292        # of Tangram may be in memory and Class::Tangram seems to
293        # offer no methods to determine this or filter its result(s) according
294        # to a specific database.
295        my @object_names = Class::Tangram::known_classes();
296        my @concret_names;
297        my $o_cnt;
298        foreach (sort @object_names) {
299          push @concret_names, $_  if (!Class::Tangram::class_is_abstract($_));
300          $o_cnt++;
301        }
302    
303        if ($filter eq 'all') {
304          return \@object_names;
305        } elsif ($filter eq 'concrete') {
306          return \@concret_names;
307        }
308        
309    $self->{meta}->{childnodes} = \@nodes;    }
310        
   return \@nodes;  
311    
312  }  }
313    
   
314  sub testIntegrity {  sub testIntegrity {
315    
316    my $self = shift;    my $self = shift;
# Line 300  sub configureCOREHANDLE { Line 384  sub configureCOREHANDLE {
384    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
385    
386    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
387      #print Dumper($self);
388      #exit;
389    
390    # apply configured modifications    # apply configured modifications
391      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
# Line 365  sub retreatSchema { Line 451  sub retreatSchema {
451    return $ok;    return $ok;
452  }  }
453    
454  sub rebuildDbAndSchema {  sub rebuildDb {
455    my $self = shift;    my $self = shift;
456    $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );    $logger->info( __PACKAGE__ . "->rebuildDb()" );
457    my @results;    my @results;
458    
459    # sum up results (bool (0/1)) in array    # sum up results (bool (0/1)) in array
# Line 407  sub getListFiltered { Line 493  sub getListFiltered {
493    my @results;    my @results;
494    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
495    
496    #print Dumper($filters);  #print Dumper($filters);
497        
498    my @tfilters;    my @tfilters;
499        
# Line 429  sub getListFiltered { Line 515  sub getListFiltered {
515    #    objects => $objects,    #    objects => $objects,
516    #  );    #  );
517        
518      # HACK: build eval-string (sorry) to get filtered list - please give advice here      # TODO: is_op?
519      push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";      # dispatch un-common operators if exists
520        if($filter->{op} eq "ref") {
521          push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
522        } else {
523          # HACK: build eval-string (sorry) to get filtered list - please give advice here
524          push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
525        }
526    
527    }    }
528    
# Line 446  sub getListFiltered { Line 538  sub getListFiltered {
538    # 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
539    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
540        
541      #print "eval: $evalstring", "\n";
542      
543    # get filtered list/set    # get filtered list/set
544    @results = eval($evalstring);    @results = eval($evalstring);
545    die $@ if $@;    die $@ if $@;
# Line 481  sub createSet { Line 575  sub createSet {
575  sub sendQuery {  sub sendQuery {
576    my $self = shift;    my $self = shift;
577    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($sql);  
578    
579    #print Dumper($query);    #print Dumper($query);
580    
581    # HACK: special case: querying by id does not translate into a common tangram query    # type = ITEM|LIST|TRANSPARENT
582    # just load the object by given id(ent)    my $type = '';
583    if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {    # mode = OID|SPECIAL
584      #print "LOAD!!!", "\n";    my $mode = '';
585      #exit;    my $ident = '';
586      #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );    my $crud = '';
587      my $ident = $query->{criterias}->[0]->{val};    
588  #print "load obj", "\n";    
589      #return $self->createSet() if $ident == 5;    # dispatch type and mode
590      $self->{_COREHANDLE}->unload($ident);    
591      my $object = $self->{_COREHANDLE}->load($ident);      # defaults - 1
592  #print "get id", "\n";      if ($query->{options}) {
593      my $oid = $self->{_COREHANDLE}->id($object);        $crud = $query->{options}->{crud};
594  #print Dumper($object);        $crud ||= $query->{options}->{action};
595  #print "oid: $oid", "\n";      }
596      return $self->createSet($object);  
597      #return $self->createSet( $self->{COREHANDLE}->load('300090018') );      # defaults - 2
598    }      $type ||= 'TRANSPARENT';
599        $crud ||= 'RETRIEVE';
600    die("This should not be reached for now - redirect to \$self->getListFiltered() here!");  
601        if ($query->{options}->{OID}) {
602    # TODO: do a common tangram query here        $type = 'ITEM';
603          $mode = 'OID';
604    my @crits;        $ident = $query->{options}->{OID};
605    foreach (@{$query->{criterias}}) {      
606      my $op = '';      } elsif (my $guid = $query->{options}->{GUID}) {
607      $op = '=' if lc $_->{op} eq 'eq';        $type = 'TRANSPARENT';
608      push @crits, "$_->{key}$op'$_->{val}'";        $query->{criterias} = [ { key => 'guid', op => 'eq', val => $guid } ];    
609    }  
610    my $subnodes = {};      # if operator is different (dispatcher for 'getListFiltered')
611    map { $subnodes->{$_}++ } @{$query->{subnodes}};      } elsif (my $op = $query->{options}->{op}) {
612    # HACK: this is hardcoded ;(    expand possibilities!        $type = 'TRANSPARENT';
613    #my $crit = join(' AND ', @crits);        $query->{criterias} = [ { key => $query->{options}->{meta_label}, op => $op, val => $query->{options}->{meta_value} } ];    
614    #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);  
615    #return $self->sendCommand($sql);      }
616    #my $h = $self->{COREHANDLE}->remote($query->{node});    
617    #my $res = $self->{COREHANDLE}->select($h, $h->{);      # HACK: special case: querying by id does not translate into a common tangram query
618    return $self->createCursor($query->{node});      # just load the object by given identifier (OID) named 'id' - this is required by Data::Transfer::Sync!
619        if ($query->{criterias} && ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq')) {
620          $type = 'ITEM';
621          $mode = 'SPECIAL.SYNC';
622          $ident = $query->{criterias}->[0]->{val};
623        }
624      
625    
626      # execute query
627      my $result;
628    
629      if ($type eq 'ITEM' && $ident) {
630    
631        if ($mode eq 'OID') {    
632          # TODO: review this case!
633          $result = $self->getObject($ident, $query->{options});
634        
635        } elsif ($mode eq 'SPECIAL.SYNC') {
636    
637          # V1 - failed
638          #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
639      
640          # hmm....
641          #return $self->createSet() if $ident == 5;
642          
643          # Unload single object before doing any further operations to
644          # expect a "fresh" object from orm when performing the next calls.
645          $self->{_COREHANDLE}->unload($ident);
646          
647          # Load object from orm.
648          my $object = $self->{_COREHANDLE}->load($ident);
649      
650          # determine object identifier (OID)
651          my $oid = $self->{_COREHANDLE}->id($object);
652          
653          # encapsulate into result/response container and return this one
654          $result = $self->createSet($object);
655          
656          # debugging
657          #$result = $self->createSet( $self->{COREHANDLE}->load('300090018') );
658    
659        }
660        
661      
662      } elsif ($type eq 'TRANSPARENT') {
663    
664        if ($crud eq 'RETRIEVE') {
665    
666          my $list = $self->getListFiltered($query->{node}, $query->{criterias});
667          #return $self->createSet($object);
668          #return $self->createSet($list);
669          return $self->createSet(@$list);
670        
671          #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
672        
673          # try a generic tangram query here
674          # TODO: try to place an oql on top of that (search.cpan.org!)
675          my @crits;
676          foreach (@{$query->{criterias}}) {
677            my $op = '';
678            $op = '=' if lc $_->{op} eq 'eq';
679            push @crits, "$_->{key}$op'$_->{val}'";
680          }
681          my $subnodes = {};
682          map { $subnodes->{$_}++ } @{$query->{subnodes}};
683          # HACK: this is hardcoded ;(    expand possibilities!
684          #my $crit = join(' AND ', @crits);
685          #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
686          #return $self->sendCommand($sql);
687          #my $h = $self->{COREHANDLE}->remote($query->{node});
688          #my $res = $self->{COREHANDLE}->select($h, $h->{);
689          $result = $self->createCursor($query->{node});
690    
691        } elsif ($crud eq 'UPDATE') {
692    
693          # Patch current query to be a loader (e.g. change action, remove payload) ...
694          my $childquery = deep_copy($query);
695          $childquery->{options}->{crud} = 'RETRIEVE';
696          delete $childquery->{payload};
697    
698          # ... to use it to fetch a fresh object using ourselves (sendQuery).
699          my $cursor = $self->sendQuery($childquery);
700          my $status = $cursor->getStatus();
701          my $object = $cursor->getNextEntry();
702    
703          # Merge values and apply value modifiers.
704          my $options = { utf8 => 1, php => 1 };
705          merge_to($object, $query->{payload}, $options);
706    
707          # Execute update operation at orm.
708          $self->update($object);
709        
710        } elsif ($crud eq 'DELETE') {
711    
712          # Patch current query to be a loader (e.g. change action) ...
713          my $childquery = deep_copy($query);
714          $childquery->{options}->{crud} = 'RETRIEVE';
715    
716          # ... to use it to fetch a fresh object using ourselves (sendQuery).
717          my $cursor = $self->sendQuery($childquery);
718          my $status = $cursor->getStatus();
719          my $object = $cursor->getNextEntry();
720    
721          $self->erase($object);
722    
723        } elsif ($crud eq 'CREATE') {
724          
725          my $nodename = $query->{node};      
726          my $newnode = $self->createNode($nodename);
727          my $id = $self->{_COREHANDLE}->insert($newnode);
728      
729          print "Saved new node $nodename with GUID $newnode->{guid}, OID '$id': " . Dumper($newnode) . "\n";
730          
731          return $newnode;
732    
733        }
734    
735      }
736    
737      return $result;
738    
739  }  }
740    
741  sub eraseAll {  sub eraseAll {
# Line 559  sub getObject { Line 771  sub getObject {
771    return $object if $object;    return $object if $object;
772  }  }
773    
774  sub getObjectByGuid {  sub getObjectByGuid_old {
775    my $self = shift;    my $self = shift;
776    my $guid = shift;    my $guid = shift;
777    my $options = shift;    my $options = shift;
# Line 589  sub getObjectByGuid { Line 801  sub getObjectByGuid {
801        
802  }  }
803    
804  sub getObjectAsHash {  sub getObjectAsHash_old {
805    my $self = shift;    my $self = shift;
806    my $oid = shift;    my $oid = shift;
807    my $options = shift;      my $options = shift;  
# Line 604  sub getObjectAsHash { Line 816  sub getObjectAsHash {
816    # build options (a callback to unload autovivified objects) for 'expand'    # build options (a callback to unload autovivified objects) for 'expand'
817    # TODO: use $logger to write to debug here!    # TODO: use $logger to write to debug here!
818    my $cb; # = sub {};    my $cb; # = sub {};
819    
820      # deactivated way to get rid of used instances, if requested
821  =pod  =pod
822    if ($options->{destroy}) {      if ($options->{destroy}) {
823      $options->{cb}->{destroy} = sub {        $options->{cb}->{destroy} = sub {
824        print "================ DESTROY", "\n";          print "================ DESTROY", "\n";
825        my $object = shift;          my $object = shift;
826        #print Dumper($object);          #print Dumper($object);
827        $self->{_COREHANDLE}->unload($object);          $self->{_COREHANDLE}->unload($object);
828        #undef($object);          #undef($object);
829      };        };
830    }      }
831  =cut  =cut
832    
833    my $hash = object2hash($obj, $options);    my $hash = expand($obj, $options);
834    #$options->{cb}->{destroy}->($obj);  
835    #$self->{_COREHANDLE}->unload($obj);    # old (unsuccessful) attempts to get rid of used instances, if requested
836      
837    # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML      # V1:
838    # now done in object2hash      #$options->{cb}->{destroy}->($obj);
839    #var2utf8($hash) if ($options->{utf8});      #$self->{_COREHANDLE}->unload($obj);
840        
841    # old (wrong) attempts to get rid of used instances, if requested      # V2:
842      #$obj->clear_refs;      #$obj->clear_refs;
843      #$self->{COREHANDLE}->unload($obj) if($options->{destroy});      #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
844      #$obj->DESTROY;      #$obj->DESTROY;
# Line 642  sub getCOREHANDLE { Line 856  sub getCOREHANDLE {
856    return $self->{_COREHANDLE};    return $self->{_COREHANDLE};
857  }  }
858    
859    sub dropDb {
860      my $self = shift;
861      my $storage = $self->_getSubLayerHandle();
862      return $storage->dropDb();
863    }
864    
865    sub testAvailability {
866      my $self = shift;
867      my $storage = $self->_getSubLayerHandle();
868      return $storage->testAvailability();
869    }
870    
871    sub disconnect2 {
872      my $self = shift;
873      my $storage = $self->_getSubLayerHandle();
874      print "DISC!", "\n";
875    
876      my $storage_ll = $storage->{_COREHANDLE};
877      $storage_ll->disconnect();
878      
879      print Dumper($storage);
880      exit;
881      
882      #$self->{_COREHANDLE}
883      #$storage->disconnect();
884      $self->{dataStorageLayer}->disconnect();
885    }
886    
887    
888    sub createNode {
889      my $self = shift;
890      my $classname = shift;
891    
892      my $obj = $classname->new();
893      
894      my $attr_options = Class::Tangram::attribute_options($classname);
895      #print "Attribute Options: " . Dumper($attr_options);
896    
897      my $attr_types = Class::Tangram::attribute_types($classname);
898      #print "Attribute Types: " . Dumper($attr_types);
899      
900      foreach(keys %{$attr_types}) {
901        if($attr_types->{$_} eq 'string') {
902          $obj->{$_} = '';
903        } elsif($attr_types->{$_} eq 'int') {
904          $obj->{$_} = 0;
905        } elsif($attr_types->{$_} eq 'real') {
906          $obj->{$_} = 0;
907        } elsif($attr_types->{$_} eq 'rawdatetime') {
908          $obj->{$_} = '0000-00-00 00:00:00';
909        } elsif($attr_types->{$_} eq 'ref') {
910          if($attr_options->{$_}->{class}) {
911            $obj->{$_} = $self->createNode($attr_options->{$_}->{class});
912          } else {
913            #$obj->{$_} = undef();
914          }
915        } elsif($attr_types->{$_} eq 'iarray') {
916            $obj->{$_} = [ ];
917        } elsif($attr_types->{$_} eq 'hash') {
918            $obj->{$_} = {  };
919        } elsif($attr_types->{$_} eq 'flat_hash') {
920            $obj->{$_} = { };
921        }
922      }
923      
924      #print "New Object: " . Dumper($obj);
925      
926      return $obj;
927    }
928    
929    
930      sub insertChildNode {
931        my $self = shift;
932        my $child_entry = shift;
933        my $query_args = shift;
934        
935        my $core = $self->{_COREHANDLE};
936        my $nodename = $query_args->{nodename};
937        
938        # get parent object
939        my $query = {
940              node => $query_args->{parent}->{nodename},
941              options => { GUID => $query_args->{parent}->{guid}, },
942              };
943        my $cursor = $self->sendQuery($query);
944        my $parent = $cursor->getNextEntry();
945    
946        # debug
947        #print "Parent_org: " . Dumper($parent);
948            
949        # Create child node object if isn't already done
950        # ($child_entry have to be the class name then...)
951        if(!ref($child_entry)) {
952          $child_entry = $self->createNode($child_entry);
953          # it could be insert 'manually' or will be insert 'transparent' if parent will be updated
954          #$core->insert($child_entry);
955          #print "Create child object [$nodename]: " . Dumper($child_entry);
956        }
957    
958        # get reference of tied node
959        my $tied_node = tied $parent->{$nodename};
960    
961        # insert/change child entry at parent
962        #print "reference: " . ref($parent->{$nodename}) . "\n";
963        if(ref($parent->{$nodename}) eq 'ARRAY') {
964          # all tangram types are tied as 'SCALAR' with special 'FETCH', 'STORE' methods per type,
965          # so a 'PUSH' is not implemented (which could be then done transparently)
966          my $array = $tied_node->FETCH;
967          push @$array, $child_entry;
968          $tied_node->STORE($array);
969          # node will be normaly untied at 'STORE'
970          if(tied $parent->{$nodename}) { print "already tied !!\n"; }
971          else { undef $tied_node; }
972        }
973        elsif(ref($parent->{$nodename}) eq 'HASH') {
974          if(my $key = $query_args->{hash_key}) {
975            # same problem as with 'ARRAY':
976            # all tangram types are tied as 'SCALAR' with special 'FETCH', 'STORE' methods per type.
977            my $hash = $tied_node->FETCH;
978            $hash->{$key} = $child_entry;
979            $tied_node->STORE($hash);
980            # node will be normaly untied at 'STORE'
981            if(tied $parent->{$nodename}) { print "already tied !!\n"; }
982            else { undef $tied_node; }
983          } else {
984           print "ERROR: No HASH KEY given, so not able to insert hash entry!";
985          }
986        }
987        else {
988          $parent->{$nodename} = $child_entry;
989        }
990    
991        # debug
992        #print "Parent_new: " . Dumper($parent);
993        
994        # save parent
995        $core->update($parent);
996        
997        # debug
998        #print "Saved Parent: ". Dumper($parent);
999        
1000        return $child_entry;
1001      }
1002    
1003    
1004  1;  1;
1005    __END__
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