/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.4 by joko, Fri Oct 25 11:44:44 2002 UTC revision 1.15 by joko, Thu Dec 5 13:55:21 2002 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.15  2002/12/05 13:55:21  joko
7    #  + now utilizing 'object2hash' instead of 'var_deref'
8    #  + played around with having fresh-objects - no progress....
9    #
10    #  Revision 1.14  2002/12/05 09:40:30  jonen
11    #  + added option->{destroy} at getObject for unloading all instance
12    #
13    #  Revision 1.13  2002/12/05 07:59:04  joko
14    #  + now using Tie::SecureHash as a base for the COREHANDLE
15    #  + former public COREHANDLE becomes private _COREHANDLE now
16    #  + sub getCOREHANDLE
17    #
18    #  Revision 1.12  2002/12/04 11:34:49  joko
19    #  - $schema_tangram doesn't have to be in class?
20    #
21    #  Revision 1.11  2002/12/04 08:54:08  jonen
22    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
23    #
24    #  Revision 1.10  2002/12/03 15:53:23  joko
25    #  + small bugfix regarding object hierarchy
26    #
27    #  Revision 1.9  2002/12/03 05:29:40  joko
28    #  + sub getObject
29    #  + sub getObjectAsHash
30    #
31    #  Revision 1.8  2002/12/01 22:25:51  joko
32    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
33    #
34    #  Revision 1.7  2002/12/01 04:46:19  joko
35    #  + sub eraseAll
36    #
37    #  Revision 1.6  2002/11/29 05:02:30  joko
38    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
39    #  + sub getMetaInfo
40    #  - sub existsChildNode (moved to Abstract.pm)
41    #  + sub getListUnfiltered
42    #  + sub getListFiltered
43    #  + sub createCursor
44    #  + sub createSet
45    #  + sub sendQuery
46    #
47    #  Revision 1.5  2002/11/17 06:35:18  joko
48    #  + locator metadata can now be reached via ->{locator}
49    #  - getChildNodes is now wrapped via COREHANDLE
50    #
51  #  Revision 1.4  2002/10/25 11:44:44  joko  #  Revision 1.4  2002/10/25 11:44:44  joko
52  #  + sub _initSchema  #  + sub _initSchema
53  #  + sub existsChildNode  #  + sub existsChildNode
# Line 21  Line 66 
66  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
67  #  + new  #  + new
68  #  #
69  #  ############################################
70  #################################  
71    
72  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
73    
74  use strict;  use strict;
75  use warnings;  use warnings;
76    
77    use base ("Data::Storage::Handler");
78  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
79    
80  use Tangram;  use Tangram;
81  use Data::Dumper;  use Data::Dumper;
82    use libp qw( getNewPerlObjectByPkgName );
83    use Data::Storage::Result::Tangram;
84    use Data::Compare::Struct qw( isEmpty );
85    use Data::Transform::Deep qw( object2hash );
86    use Data::Transform::Encode qw( var2utf8 );
87    
88    
89  # get logger instance  # get logger instance
90  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
91    
92    
93  our $metainfo = {  # this holds the complete instantiated schema from tangram
94    'disconnectMethod' => 'disconnect',  my $schema_tangram;
 };  
95    
96  sub getNewPerlObjectByPkgName {  sub getMetaInfo {
97    my $pkgname = shift;    my $self = shift;
98    my $args = shift;    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
99    $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );    return {
100    my $evstring = "use $pkgname;";      'disconnectMethod' => 'disconnect',
101    eval($evstring);    };
   $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );  
   return $pkgname->new($args);  
102  }  }
103    
104  sub _initSchema {  sub _initSchema {
105    my $self = shift;    my $self = shift;
106    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
107    #if (!$self->{schema_tangram}) {    #if (!$schema_tangram) {
108      my $obj = getNewPerlObjectByPkgName($self->{schema}, { EXPORT_OBJECTS => $self->{classnames} } );      my $obj = getNewPerlObjectByPkgName($self->{locator}->{schema}, { EXPORT_OBJECTS => $self->{locator}->{classnames}, want_transactions => $self->{locator}->{want_transactions} } );
109      $self->{schema_tangram} = $obj->getSchema();      $schema_tangram = $obj->getSchema();
110    #}    #}
111    if (!$self->{schema_tangram}) {    if (!$schema_tangram) {
112      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
113      return 0;      return 0;
114    }    }
# Line 71  sub connect { Line 120  sub connect {
120      my $self = shift;      my $self = shift;
121            
122      my $dsn = shift;      my $dsn = shift;
123      $dsn ||= $self->{dbi}->{dsn};      $dsn ||= $self->{locator}->{dbi}->{dsn};
124            
125      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
126            
# Line 86  sub connect { Line 135  sub connect {
135    
136      return unless $self->_initSchema();      return unless $self->_initSchema();
137    
138        # create the main tangram storage object
139      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
140      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
141    
142    #print "connect", "\n";
143    #my $core = $self->{_COREHANDLE};
144    #print Dumper($core);
145        
146        # some attempts for configuring the wrapped underlying dbi.....
147      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
148      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
149      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
150        
151        # ..... encapsulation wins!
152      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
153    
154      $self->{locator}->{status}->{connected} = 1;
155    
156    return 1;    return 1;
157    
158  }  }
# Line 108  sub getChildNodes { Line 167  sub getChildNodes {
167    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
168    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
169    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
170      
171      # todo: should we retrieve information from the schema here
172      # rather than poorly getting table names from underlying dbi?
173    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
174      @nodes = @{$storage->getChildNodes()};
175    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
176    #print "getchildnodes\n";
177    #print Dumper($self);
178    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
   if (my $result = $storage->sendCommand( 'SHOW TABLES;' ) ) {  
     while ( my $row = $result->_getNextEntry() ) {  
       push @nodes, $row;  
     }  
   }  
179        
180    $storage->disconnect();    # TODO: REVIEW
181      #$storage->disconnect();
182        
183    $self->{meta}->{childnodes} = \@nodes;    $self->{meta}->{childnodes} = \@nodes;
184        
# Line 127  sub getChildNodes { Line 187  sub getChildNodes {
187  }  }
188    
189    
 sub existsChildNode {  
   my $self = shift;  
   my $nodename = shift;  
   $logger->debug( __PACKAGE__ . "->getChildNode( nodename $nodename )" );  
   $self->getChildNodes() unless $self->{meta}->{childnodes};  
   return grep $nodename, @{$self->{meta}->{childnodes}};  
 }  
   
   
190  sub testIntegrity {  sub testIntegrity {
191    
192    my $self = shift;    my $self = shift;
# Line 154  sub testIntegrity { Line 205  sub testIntegrity {
205      return;      return;
206    }    }
207    
208      $self->{locator}->{status}->{integrity} = 1;
209    return 1;    return 1;
210    
211  }  }
# Line 165  sub _getSubLayerHandle { Line 217  sub _getSubLayerHandle {
217        
218    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
219    
   use Data::Dumper;  
220    #print Dumper($self);    #print Dumper($self);
221    #exit;  
     
222    # hack, make more generic!    # hack, make more generic!
223    if (!$self->{dataStorageLayer}) {    if (!$self->{dataStorageLayer}) {
224      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
225      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );      #my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi}, COREHANDLE => $self->{COREHANDLE}->{db} );
226      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi} );      my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
227      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
228      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
229      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
# Line 197  sub _configureUnderlyingStorage { Line 247  sub _configureUnderlyingStorage {
247    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
248      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
249      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
250      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
251    }    }
252    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
253  }  }
# Line 213  sub configureCOREHANDLE { Line 263  sub configureCOREHANDLE {
263    
264    # apply configured modifications    # apply configured modifications
265      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
266        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
267      }      }
268      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
269        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
270      }      }
271      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
272        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
273      }      }
274      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
275        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
276      }      }
277    
278  }  }
279    
280  sub deploySchema {  sub deploySchema {
281    my $self = shift;    my $self = shift;
282    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
283    my $dsn = $self->{dbi}->{dsn};    
284      my $dsn = $self->{locator}->{dbi}->{dsn};
285    
286    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
287    
288    my $ok;    my $ok;
289    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       PrintError => 0,  
                                                     } ) ) {  
   
290      return unless $self->_initSchema();      return unless $self->_initSchema();
291            $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );  
292      $dbh->disconnect();      $dbh->disconnect();
293    }    }
294    return $ok;    return $ok;
# Line 250  sub deploySchema { Line 297  sub deploySchema {
297  sub retreatSchema {  sub retreatSchema {
298    
299    my $self = shift;    my $self = shift;
300    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   my $dsn = $self->{dbi}->{dsn};  
301    
302    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
303    
304    my $ok;    my $ok;
305    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
306    
307      return unless $self->_initSchema();      return unless $self->_initSchema();
308            
309      #use Data::Dumper; print Dumper($self);      #use Data::Dumper; print Dumper($self);
310      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
311            
312      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
313      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
314                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
315                      #          problem with this: there may be some left not having been included to the schema      # - ... Tangram::Relational->retreat doesn't seem to return a valid status
316        # - possible improvement:
317        #   - test this by checking for count of tables in database
318        #   - problem with this: there may be some left not having been included to the schema
319        #   - maybe better: use "->getChildNodes"?
320        $ok = 2;
321    
322      $dbh->disconnect();      $dbh->disconnect();
323    
324    }    }
325    return $ok;    return $ok;
326  }  }
# Line 295  sub rebuildDbAndSchema { Line 345  sub rebuildDbAndSchema {
345    return $res;    return $res;
346  }  }
347    
348    sub getListUnfiltered {
349      my $self = shift;
350      my $nodename = shift;
351      my @results;
352      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
353      # get set of objects from odbms by object name
354      my $object_set = $self->{_COREHANDLE}->remote($nodename);
355      @results = $self->{_COREHANDLE}->select($object_set);
356      return \@results;
357    }
358    
359    sub getListFiltered {
360      my $self = shift;
361    
362      # redirect to unfiltered mode
363      #return $self->getListUnfiltered(@_);
364    
365      my $nodename = shift;
366      my $filters = shift;
367      my @results;
368      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
369    
370      #print Dumper($filters);
371      
372      my @tfilters;
373      
374      foreach my $filter (@$filters) {
375      
376        # get filter - TODO: for each filter
377        #my $filter = $filters->[0];
378      
379        # build filter
380        my $lexpr = $filter->{key};
381        #my $op = $filter->{op};
382        my $op = '=';
383        my $rexpr = $filter->{val};
384        my $tight = 100;
385        
386      #  my $tfilter = Tangram::Filter->new(
387      #    expr => "t1.$lexpr $op '$rexpr'",
388      #    tight => $tight,
389      #    objects => $objects,
390      #  );
391      
392        # HACK: build eval-string (sorry) to get filtered list - please give advice here
393        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
394    
395      }
396    
397      my $tfilter = join(' & ', @tfilters);
398    
399      # get set of objects from odbms by object name
400      my $remote = $self->{_COREHANDLE}->remote($nodename);
401      
402      # was:
403      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
404    
405      # is:
406      # HACK: build eval-string (sorry) to get filtered list - please give advice here
407      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
408      
409      # get filtered list/set
410      @results = eval($evalstring);
411      die $@ if $@;
412      
413      return \@results;
414    }
415    
416    sub createCursor {
417      my $self = shift;
418      my $node = shift;
419      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
420      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
421      return $result;
422    }
423    
424    sub createSet {
425      my $self = shift;
426      my @objects = @_;
427      my $rh = Set::Object->new();
428      foreach (@objects) {
429        #print Dumper($_);
430        $rh->insert($_) if !isEmpty($_);
431      }
432      #print Dumper($rh->members());
433      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
434      return $result;
435    }
436    
437    sub sendQuery {
438      my $self = shift;
439      my $query = shift;
440      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
441      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
442    
443      #print Dumper($query);
444    
445      # HACK: special case: querying by id does not translate into a common tangram query
446      # just load the object by given id(ent)
447      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
448        #print "LOAD!!!", "\n";
449        #exit;
450        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
451        my $ident = $query->{criterias}->[0]->{val};
452    #print "load obj", "\n";
453        #return $self->createSet() if $ident == 5;
454        my $object = $self->{_COREHANDLE}->load($ident);
455    #print "get id", "\n";
456        my $oid = $self->{_COREHANDLE}->id($object);
457        return $self->createSet($object);
458        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
459      }
460    
461      die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
462    
463      # TODO: do a common tangram query here
464    
465      my @crits;
466      foreach (@{$query->{criterias}}) {
467        my $op = '';
468        $op = '=' if lc $_->{op} eq 'eq';
469        push @crits, "$_->{key}$op'$_->{val}'";
470      }
471      my $subnodes = {};
472      map { $subnodes->{$_}++ } @{$query->{subnodes}};
473      # HACK: this is hardcoded ;(    expand possibilities!
474      #my $crit = join(' AND ', @crits);
475      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
476      #return $self->sendCommand($sql);
477      #my $h = $self->{COREHANDLE}->remote($query->{node});
478      #my $res = $self->{COREHANDLE}->select($h, $h->{);
479      return $self->createCursor($query->{node});
480    }
481    
482    sub eraseAll {
483      my $self = shift;
484      my $classname = shift;
485      my $remote = $self->{_COREHANDLE}->remote($classname);
486      my @objs = $self->{_COREHANDLE}->select($remote);
487      $self->{_COREHANDLE}->erase(@objs);
488    }
489    
490    sub createDb {
491      my $self = shift;
492      my $storage = $self->_getSubLayerHandle();
493      return $storage->createDb();
494    }
495    
496    sub getObject {
497      my $self = shift;
498      my $oid = shift;
499      my $options = shift;
500      # TODO: create a deep_unload method
501      # unload($oid) will only unload object, not deep object hashes
502      $self->{_COREHANDLE}->unload() if($options->{destroy});
503      # TODO: review this
504      #if (!$self->{COREHANDLE}) { return; }
505      return $self->{_COREHANDLE}->load($oid);
506    }
507    
508    sub getObjectAsHash {
509      my $self = shift;
510      my $oid = shift;
511      my $options = shift;
512      my $obj = $self->getObject($oid, $options);
513      
514      # build options (a callback to unload autovivified objects) for 'expand'
515      # TODO: use $logger to write to debug here!
516      my $cb; # = sub {};
517    =pod
518      if ($options->{destroy}) {
519        $options->{cb}->{destroy} = sub {
520          print "================ DESTROY", "\n";
521          my $object = shift;
522          #print Dumper($object);
523          $self->{_COREHANDLE}->unload($object);
524          #undef($object);
525        };
526      }
527    =cut
528    
529      my $hash = object2hash($obj, $options);
530      #$options->{cb}->{destroy}->($obj);
531      #$self->{_COREHANDLE}->unload($obj);
532      
533      # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
534      # now done in object2hash
535      #var2utf8($hash) if ($options->{utf8});
536      
537      # old (wrong) attempts to get rid of used instances, if requested
538        #$obj->clear_refs;
539        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
540        #$obj->DESTROY;
541        #undef($obj) if($options->{destroy});
542      
543      return $hash;
544    }
545    
546    sub getSchema {
547      return $schema_tangram;
548    }
549    
550    sub getCOREHANDLE {
551      my $self = shift;
552      return $self->{_COREHANDLE};
553    }
554    
555  1;  1;
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