/[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 1.27 by joko, Fri Jan 31 06:30:59 2003 UTC
# Line 1  Line 1 
1  #################################  ############################################
2  #  #
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.27  2003/01/31 06:30:59  joko
7    #  + enabled 'sendQuery'
8    #
9    #  Revision 1.26  2003/01/30 22:29:47  joko
10    #  + fixed module usage (removed dependency on 'libp.pm')
11    #
12    #  Revision 1.25  2003/01/19 02:30:05  joko
13    #  + fix: modified call to '_initSchema'
14    #
15    #  Revision 1.24  2002/12/22 14:13:01  joko
16    #  + sub dropDb
17    #
18    #  Revision 1.23  2002/12/19 16:31:53  joko
19    #  +- renamed sub to 'rebuildDb'
20    #
21    #  Revision 1.22  2002/12/18 22:28:16  jonen
22    #  + added extended logging at 'getObjectByGuid()'
23    #
24    #  Revision 1.21  2002/12/16 22:20:49  jonen
25    #  + fixed bug at 'getObjectByGuid()'
26    #
27    #  Revision 1.20  2002/12/16 20:49:17  jonen
28    #  + added sub 'getObjectByGuid()'
29    #  + added functionality to use 'getObjectByGuid' at 'getObjectAsHash()'
30    #
31    #  Revision 1.19  2002/12/16 06:46:09  joko
32    #  + attempt to introduce a generic '_patchSchema' - cancelled!
33    #
34    #  Revision 1.18  2002/12/13 21:48:07  joko
35    #  + fix to 'sub sendQuery'
36    #
37    #  Revision 1.17  2002/12/12 02:51:09  joko
38    #  + cosmetics
39    #
40    #  Revision 1.16  2002/12/11 06:54:10  joko
41    #  + fix: encapsulated object-loading inside an 'eval'
42    #
43    #  Revision 1.15  2002/12/05 13:55:21  joko
44    #  + now utilizing 'object2hash' instead of 'var_deref'
45    #  + played around with having fresh-objects - no progress....
46    #
47    #  Revision 1.14  2002/12/05 09:40:30  jonen
48    #  + added option->{destroy} at getObject for unloading all instance
49    #
50    #  Revision 1.13  2002/12/05 07:59:04  joko
51    #  + now using Tie::SecureHash as a base for the COREHANDLE
52    #  + former public COREHANDLE becomes private _COREHANDLE now
53    #  + sub getCOREHANDLE
54    #
55    #  Revision 1.12  2002/12/04 11:34:49  joko
56    #  - $schema_tangram doesn't have to be in class?
57    #
58    #  Revision 1.11  2002/12/04 08:54:08  jonen
59    #  + untested bugfix: undef($object) after transform to hash at getObjectAsHash
60    #
61    #  Revision 1.10  2002/12/03 15:53:23  joko
62    #  + small bugfix regarding object hierarchy
63    #
64    #  Revision 1.9  2002/12/03 05:29:40  joko
65    #  + sub getObject
66    #  + sub getObjectAsHash
67    #
68    #  Revision 1.8  2002/12/01 22:25:51  joko
69    #  + now utilizing metadata from storage locator when connecting to DBI in "raw"-mode
70    #
71    #  Revision 1.7  2002/12/01 04:46:19  joko
72    #  + sub eraseAll
73    #
74    #  Revision 1.6  2002/11/29 05:02:30  joko
75    #  - sub getNewPerlObjectByPkgName (moved to libp.pm)
76    #  + sub getMetaInfo
77    #  - sub existsChildNode (moved to Abstract.pm)
78    #  + sub getListUnfiltered
79    #  + sub getListFiltered
80    #  + sub createCursor
81    #  + sub createSet
82    #  + sub sendQuery
83    #
84    #  Revision 1.5  2002/11/17 06:35:18  joko
85    #  + locator metadata can now be reached via ->{locator}
86    #  - getChildNodes is now wrapped via COREHANDLE
87    #
88  #  Revision 1.4  2002/10/25 11:44:44  joko  #  Revision 1.4  2002/10/25 11:44:44  joko
89  #  + sub _initSchema  #  + sub _initSchema
90  #  + sub existsChildNode  #  + sub existsChildNode
# Line 21  Line 103 
103  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko  #  Revision 1.1  2002/10/10 03:44:07  cvsjoko
104  #  + new  #  + new
105  #  #
106  #  ############################################
107  #################################  
108    
109  package Data::Storage::Handler::Tangram;  package Data::Storage::Handler::Tangram;
110    
111  use strict;  use strict;
112  use warnings;  use warnings;
113    
114    use base ("Data::Storage::Handler");
115  use base ("Data::Storage::Handler::Abstract");  use base ("Data::Storage::Handler::Abstract");
116    
117  use Tangram;  use Tangram;
118  use Data::Dumper;  use Data::Dumper;
119    use DesignPattern::Object;
120    use Data::Storage::Result::Tangram;
121    use Data::Compare::Struct qw( isEmpty );
122    use Data::Transform::Deep qw( object2hash );
123    use Data::Transform::Encode qw( var2utf8 );
124    
125  # get logger instance  # get logger instance
126  my $logger = Log::Dispatch::Config->instance;  my $logger = Log::Dispatch::Config->instance;
127    
128    
129  our $metainfo = {  # this holds the complete instantiated schema from tangram
130    'disconnectMethod' => 'disconnect',  my $schema_tangram;
 };  
131    
132  sub getNewPerlObjectByPkgName {  sub getMetaInfo {
133    my $pkgname = shift;    my $self = shift;
134    my $args = shift;    $logger->debug( __PACKAGE__ . "->getMetaInfo()"  );
135    $logger->debug( __PACKAGE__ . "->getNewPerlObjectByPkgName( pkgname $pkgname args $args )" );    return {
136    my $evstring = "use $pkgname;";      'disconnectMethod' => 'disconnect',
137    eval($evstring);    };
   $@ && $logger->error( __PACKAGE__ . ':' . __LINE__ . " Error in eval: " .  $@ );  
   return $pkgname->new($args);  
138  }  }
139    
140  sub _initSchema {  sub _initSchema {
141    my $self = shift;    my $self = shift;
142    $logger->debug( __PACKAGE__ . "->_initSchema()" );    $logger->debug( __PACKAGE__ . "->_initSchema()" );
143    #if (!$self->{schema_tangram}) {    #if (!$schema_tangram) {
144      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} } );
145      $self->{schema_tangram} = $obj->getSchema();      my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
146        $schema_tangram = $obj->getSchema();
147    #}    #}
148    if (!$self->{schema_tangram}) {    if (!$schema_tangram) {
149      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );
150      return 0;      return 0;
151    }    }
152      #$self->_patchSchema();
153    return 1;    return 1;
154  }  }
155    
156    sub _patchSchema {
157      my $self = shift;
158      foreach (keys %{$schema_tangram->{classes}}) {
159        next if $schema_tangram->{classes}->{$_}->{abstract};
160        #next if ($_ ne 'TsBankAccount');
161        #$_ ne 'AbstractAccount' &&
162        print "class: $_", "\n";
163    #print Dumper($schema_tangram->{classes}->{$_});
164        # create new string property named 'guid'
165        my $tstring = Tangram::String->new();
166        $tstring->{name} = $tstring->{col} = 'guid';
167        # inject property into schema
168        #$schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields}->{string}->{$tstring->{name}} = $tstring;
169        print Dumper($schema_tangram->{classes}->{$_}->{root}->{SPECS}->[0]->{fields});
170      }
171    }
172    
173  sub connect {  sub connect {
174    
175      my $self = shift;      my $self = shift;
176            
177      my $dsn = shift;      my $dsn = shift;
178      $dsn ||= $self->{dbi}->{dsn};  
179        #print Dumper($self);
180    #exit;
181    
182        # TODO: re-enable
183        $dsn ||= $self->{locator}->{dbi}->{dsn};
184      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );      $logger->debug( __PACKAGE__ . "->connect( dsn $dsn )" );
185            
186      #my $storage = Tangram::Relational->connect( $schema, $dsn );      #my $storage = Tangram::Relational->connect( $schema, $dsn );
# Line 84  sub connect { Line 192  sub connect {
192  #      return;  #      return;
193  #    }  #    }
194    
195      return unless $self->_initSchema();      #return unless $self->_initSchema();
196        $self->_initSchema();
197    
198        # create the main tangram storage object
199      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
200      $self->{COREHANDLE} = Tangram::Relational->connect( $self->{schema_tangram}, $dsn );      $self->{_COREHANDLE} = Tangram::Relational->connect( $schema_tangram, $dsn );
201    
202    #print "connect", "\n";
203    #my $core = $self->{_COREHANDLE};
204    #print Dumper($core);
205        
206        # some attempts for configuring the wrapped underlying dbi.....
207      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();      #$self->{STORAGEHANDLE_UNDERLYING} = $self->getUnderlyingStorage();
208      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();      #$self->{STORAGEHANDLE_UNDERLYING}->_configureCOREHANDLE();
209      #$self->_configureUnderlyingStorage;      #$self->_configureUnderlyingStorage;
210        
211        # ..... encapsulation wins!
212      $self->configureCOREHANDLE();      $self->configureCOREHANDLE();
213    
214      $self->{locator}->{status}->{connected} = 1;
215    
216    return 1;    return 1;
217    
218  }  }
# Line 108  sub getChildNodes { Line 227  sub getChildNodes {
227    # 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
228    #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} });
229    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
230      
231      # todo: should we retrieve information from the schema here
232      # rather than poorly getting table names from underlying dbi?
233    my $storage = $self->_getSubLayerHandle();    my $storage = $self->_getSubLayerHandle();
234      @nodes = @{$storage->getChildNodes()};
235    #$storage->_configureCOREHANDLE();    #$storage->_configureCOREHANDLE();
236    #print "getchildnodes\n";
237    #print Dumper($self);
238    #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;  
     }  
   }  
239        
240    $storage->disconnect();    # TODO: REVIEW
241      #$storage->disconnect();
242        
243    $self->{meta}->{childnodes} = \@nodes;    $self->{meta}->{childnodes} = \@nodes;
244        
# Line 127  sub getChildNodes { Line 247  sub getChildNodes {
247  }  }
248    
249    
 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}};  
 }  
   
   
250  sub testIntegrity {  sub testIntegrity {
251    
252    my $self = shift;    my $self = shift;
# Line 154  sub testIntegrity { Line 265  sub testIntegrity {
265      return;      return;
266    }    }
267    
268      $self->{locator}->{status}->{integrity} = 1;
269    return 1;    return 1;
270    
271  }  }
# Line 165  sub _getSubLayerHandle { Line 277  sub _getSubLayerHandle {
277        
278    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );    $logger->debug( __PACKAGE__ . "->_getSubLayerHandle()" );
279    
   use Data::Dumper;  
280    #print Dumper($self);    #print Dumper($self);
281    #exit;  
     
282    # hack, make more generic!    # hack, make more generic!
283    if (!$self->{dataStorageLayer}) {    if (!$self->{dataStorageLayer}) {
284      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );      $logger->debug( __PACKAGE__ . "->_getSubLayerHandle() creating new dataStorageLayer" );
285      #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} );
286      my $loc = Data::Storage::Locator->new( type => "DBI", dbi => $self->{dbi} );      my $loc = Data::Storage::Locator->new( { type => "DBI", dbi => $self->{locator}->{dbi} } );
287      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );      $self->{dataStorageLayer} = Data::Storage->new( $loc, { protected => 1 } );
288      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->{STORAGEHANDLE}->_configureCOREHANDLE();
289      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();      #$self->{STORAGE_UNDER_THE_HOOD}->_configureCOREHANDLE();
# Line 197  sub _configureUnderlyingStorage { Line 307  sub _configureUnderlyingStorage {
307    foreach my $key (keys %{$self->{dbi}}) {    foreach my $key (keys %{$self->{dbi}}) {
308      my $val = $self->{dbi}->{$key};      my $val = $self->{dbi}->{$key};
309      print "entry: $key; $val", "\n";      print "entry: $key; $val", "\n";
310      $self->{COREHANDLE}->{db}->{$key} = $val;      $self->{_COREHANDLE}->{db}->{$key} = $val;
311    }    }
312    #print Dumper($self->{COREHANDLE}->{db});    #print Dumper($self->{COREHANDLE}->{db});
313  }  }
# Line 210  sub configureCOREHANDLE { Line 320  sub configureCOREHANDLE {
320    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );    $logger->debug( __PACKAGE__ . "->configureCOREHANDLE" );
321    
322    #my $subLayer = $self->_getSubLayerHandle();    #my $subLayer = $self->_getSubLayerHandle();
323      #print Dumper($self);
324      #exit;
325    
326    # apply configured modifications    # apply configured modifications
327      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {      if (exists $self->{dbi}->{trace_level} && exists $self->{dbi}->{trace_file}) {
328        $self->{COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});        $self->{_COREHANDLE}->{db}->trace($self->{dbi}->{trace_level}, $self->{dbi}->{trace_file});
329      }      }
330      if (exists $self->{dbi}->{RaiseError}) {      if (exists $self->{dbi}->{RaiseError}) {
331        $self->{COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};        $self->{_COREHANDLE}->{db}->{RaiseError} = $self->{dbi}->{RaiseError};
332      }      }
333      if (exists $self->{dbi}->{PrintError}) {      if (exists $self->{dbi}->{PrintError}) {
334        $self->{COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};        $self->{_COREHANDLE}->{db}->{PrintError} = $self->{dbi}->{PrintError};
335      }      }
336      if (exists $self->{dbi}->{HandleError}) {      if (exists $self->{dbi}->{HandleError}) {
337        $self->{COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};        $self->{_COREHANDLE}->{db}->{HandleError} = $self->{dbi}->{HandleError};
338      }      }
339    
340  }  }
341    
342  sub deploySchema {  sub deploySchema {
343    my $self = shift;    my $self = shift;
344    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $args = shift;
345    my $dsn = $self->{dbi}->{dsn};    
346      my $dsn = $self->{locator}->{dbi}->{dsn};
347    
348    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->deploySchema( dsn $dsn )" );
349    
350    my $ok;    my $ok;
351    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       PrintError => 0,  
                                                     } ) ) {  
   
352      return unless $self->_initSchema();      return unless $self->_initSchema();
353            $ok = Tangram::Relational->deploy($schema_tangram, $dbh );
     $ok = Tangram::Relational->deploy($self->{schema_tangram}, $dbh );  
354      $dbh->disconnect();      $dbh->disconnect();
355    }    }
356    return $ok;    return $ok;
# Line 250  sub deploySchema { Line 359  sub deploySchema {
359  sub retreatSchema {  sub retreatSchema {
360    
361    my $self = shift;    my $self = shift;
362    #my $dsn = $self->{locator}->{dbi}->{dsn};    my $dsn = $self->{locator}->{dbi}->{dsn};
   my $dsn = $self->{dbi}->{dsn};  
363    
364    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );    $logger->debug( __PACKAGE__ . "->retreatSchema( dsn $dsn )" );
365    
366    my $ok;    my $ok;
367    if ( my $dbh = DBI->connect($dsn, '', '', {    if ( my $dbh = DBI->connect($dsn, '', '', $self->{locator}->{dbi} ) ) {
                                                       #PrintError => 0,  
                                                       #RaiseError => 0,  
                                                     } ) ) {  
368    
369      return unless $self->_initSchema();      return unless $self->_initSchema();
370            
371      #use Data::Dumper; print Dumper($self);      #use Data::Dumper; print Dumper($self);
372      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");      $self->{dataStorageLayer}->removeLogDispatchHandler("Tangram11");
373            
374      $ok = Tangram::Relational->retreat($self->{schema_tangram}, $dbh );      $ok = Tangram::Relational->retreat($schema_tangram, $dbh );
375      $ok = 2;    # answer is "maybe" for now since Tangram::Relational->retreat doesn't seem to return a valid status  
376                      # idea: test this by checking for count of tables in database -      # answer "$ok=2" means "maybe" for now - we have to patch this to a constant here because...
377                      #          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
378        # - possible improvement:
379        #   - test this by checking for count of tables in database
380        #   - problem with this: there may be some left not having been included to the schema
381        #   - maybe better: use "->getChildNodes"?
382        $ok = 2;
383    
384      $dbh->disconnect();      $dbh->disconnect();
385    
386    }    }
387    return $ok;    return $ok;
388  }  }
389    
390  sub rebuildDbAndSchema {  sub rebuildDb {
391    my $self = shift;    my $self = shift;
392    $logger->info( __PACKAGE__ . "->rebuildDbAndSchema()" );    $logger->info( __PACKAGE__ . "->rebuildDb()" );
393    my @results;    my @results;
394    
395    # sum up results (bool (0/1)) in array    # sum up results (bool (0/1)) in array
# Line 295  sub rebuildDbAndSchema { Line 407  sub rebuildDbAndSchema {
407    return $res;    return $res;
408  }  }
409    
410    sub getListUnfiltered {
411      my $self = shift;
412      my $nodename = shift;
413      my @results;
414      $logger->debug( __PACKAGE__ . "->getListUnfiltered( nodename => '" . $nodename . "' )" );
415      # get set of objects from odbms by object name
416      my $object_set = $self->{_COREHANDLE}->remote($nodename);
417      @results = $self->{_COREHANDLE}->select($object_set);
418      return \@results;
419    }
420    
421    sub getListFiltered {
422      my $self = shift;
423    
424      # redirect to unfiltered mode
425      #return $self->getListUnfiltered(@_);
426    
427      my $nodename = shift;
428      my $filters = shift;
429      my @results;
430      $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );
431    
432    #print Dumper($filters);
433      
434      my @tfilters;
435      
436      foreach my $filter (@$filters) {
437      
438        # get filter - TODO: for each filter
439        #my $filter = $filters->[0];
440      
441        # build filter
442        my $lexpr = $filter->{key};
443        #my $op = $filter->{op};
444        my $op = '=';
445        my $rexpr = $filter->{val};
446        my $tight = 100;
447        
448      #  my $tfilter = Tangram::Filter->new(
449      #    expr => "t1.$lexpr $op '$rexpr'",
450      #    tight => $tight,
451      #    objects => $objects,
452      #  );
453      
454        # HACK: build eval-string (sorry) to get filtered list - please give advice here
455        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
456    
457      }
458    
459      my $tfilter = join(' & ', @tfilters);
460    
461      # get set of objects from odbms by object name
462      my $remote = $self->{_COREHANDLE}->remote($nodename);
463      
464      # was:
465      #@results = $self->{COREHANDLE}->select($object_set, $tfilter);
466    
467      # is:
468      # HACK: build eval-string (sorry) to get filtered list - please give advice here
469      my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';
470      
471      #print "eval: $evalstring", "\n";
472      
473      # get filtered list/set
474      @results = eval($evalstring);
475      die $@ if $@;
476      
477      return \@results;
478    }
479    
480    sub createCursor {
481      my $self = shift;
482      my $node = shift;
483      my $cmdHandle = $self->{_COREHANDLE}->cursor($node);
484      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $cmdHandle );
485      return $result;
486    }
487    
488    sub createSet {
489      my $self = shift;
490    #print "-" x 80, "\n";
491    #print Dumper(@_);
492      my @objects = @_;
493      my $rh = Set::Object->new();
494      foreach (@objects) {
495        if (!isEmpty($_)) {
496    #print Dumper($_);
497          $rh->insert($_);
498        }
499      }
500      #print Dumper($rh->members());
501      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
502      return $result;
503    }
504    
505    sub sendQuery {
506      my $self = shift;
507      my $query = shift;
508      #my $sql = "SELECT cs FROM $self->{metainfo}->{$descent}->{node} WHERE $self->{metainfo}->{$descent}->{IdentProvider}->{arg}='$self->{entry}->{source}->{ident}';";
509      #my $result = $self->{metainfo}->{$descent}->{storage}->sendCommand($sql);
510    
511      #print Dumper($query);
512    
513      # HACK: special case: querying by id does not translate into a common tangram query
514      # just load the object by given id(ent)
515      if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
516        #print "LOAD!!!", "\n";
517        #exit;
518        #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
519        my $ident = $query->{criterias}->[0]->{val};
520    #print "load obj", "\n";
521        #return $self->createSet() if $ident == 5;
522        $self->{_COREHANDLE}->unload($ident);
523        my $object = $self->{_COREHANDLE}->load($ident);
524    #print "get id", "\n";
525        my $oid = $self->{_COREHANDLE}->id($object);
526    #print Dumper($object);
527    #print "oid: $oid", "\n";
528        return $self->createSet($object);
529        #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
530      }
531    
532      my $list = $self->getListFiltered($query->{node}, $query->{criterias});
533      #return $self->createSet($object);
534      #return $self->createSet($list);
535      return $self->createSet(@$list);
536    
537      #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
538    
539    
540    
541    
542      # try a generic tangram query here
543      # TODO: try to place an oql on top of that (search.cpan.org!)
544      my @crits;
545      foreach (@{$query->{criterias}}) {
546        my $op = '';
547        $op = '=' if lc $_->{op} eq 'eq';
548        push @crits, "$_->{key}$op'$_->{val}'";
549      }
550      my $subnodes = {};
551      map { $subnodes->{$_}++ } @{$query->{subnodes}};
552      # HACK: this is hardcoded ;(    expand possibilities!
553      #my $crit = join(' AND ', @crits);
554      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
555      #return $self->sendCommand($sql);
556      #my $h = $self->{COREHANDLE}->remote($query->{node});
557      #my $res = $self->{COREHANDLE}->select($h, $h->{);
558      return $self->createCursor($query->{node});
559    }
560    
561    sub eraseAll {
562      my $self = shift;
563      my $classname = shift;
564      my $remote = $self->{_COREHANDLE}->remote($classname);
565      my @objs = $self->{_COREHANDLE}->select($remote);
566      $self->{_COREHANDLE}->erase(@objs);
567    }
568    
569    sub createDb {
570      my $self = shift;
571      my $storage = $self->_getSubLayerHandle();
572      return $storage->createDb();
573    }
574    
575    sub getObject {
576      my $self = shift;
577      my $oid = shift;
578      my $options = shift;
579    
580      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
581      # unload($oid) will only unload object, not deep object hashes
582      $self->{_COREHANDLE}->unload() if ($options->{destroy});
583    
584      # TODO: review this
585      #if (!$self->{COREHANDLE}) { return; }
586    
587      # TODO: review this
588      my $object = eval('$self->{_COREHANDLE}->load($oid);');
589      print $@, "\n" if $@;
590    
591      return $object if $object;
592    }
593    
594    sub getObjectByGuid {
595      my $self = shift;
596      my $guid = shift;
597      my $options = shift;
598      
599      # Guid and Classname is needed
600      if(!$guid || !$options->{classname}) {
601       $logger->error( __PACKAGE__ . "->getObjectByGuid: No 'guid' OR no Classname in options hash was given but needed!" );
602        return;
603      }
604      
605      # TODO: create a deep_unload method (currently _all_ objects are unloaded)
606      # unload($oid) will only unload object, not deep object hashes
607      $self->{_COREHANDLE}->unload() if ($options->{destroy});
608    
609      # search for object with given Classname and Guid
610      my $obj_tmp = $self->{_COREHANDLE}->remote($options->{classname});
611      my @result = $self->{_COREHANDLE}->select($obj_tmp, $obj_tmp->{guid} eq $guid);
612      
613      # we searched for global unique identifer of some object,
614      # so I think we can trust there would be only one result
615      if($result[0]) {
616        return $result[0];
617      } else {
618        $logger->error( __PACKAGE__ . "->getObjectByGuid: No Object with Classname $options->{classname} and GUID $guid found!" );
619        return;
620      }
621      
622    }
623    
624    sub getObjectAsHash {
625      my $self = shift;
626      my $oid = shift;
627      my $options = shift;  
628      my $obj;
629      
630      if($options->{guid}) {
631        $obj = $self->getObjectByGuid($oid, $options);
632      } else {
633        $obj = $self->getObject($oid, $options);
634      }
635      
636      # build options (a callback to unload autovivified objects) for 'expand'
637      # TODO: use $logger to write to debug here!
638      my $cb; # = sub {};
639    =pod
640      if ($options->{destroy}) {
641        $options->{cb}->{destroy} = sub {
642          print "================ DESTROY", "\n";
643          my $object = shift;
644          #print Dumper($object);
645          $self->{_COREHANDLE}->unload($object);
646          #undef($object);
647        };
648      }
649    =cut
650    
651      my $hash = object2hash($obj, $options);
652      #$options->{cb}->{destroy}->($obj);
653      #$self->{_COREHANDLE}->unload($obj);
654      
655      # convert values in hash to utf8 to be ready for (e.g.) encapsulation in XML
656      # now done in object2hash
657      #var2utf8($hash) if ($options->{utf8});
658      
659      # old (wrong) attempts to get rid of used instances, if requested
660        #$obj->clear_refs;
661        #$self->{COREHANDLE}->unload($obj) if($options->{destroy});
662        #$obj->DESTROY;
663        #undef($obj) if($options->{destroy});
664      
665      return $hash;
666    }
667    
668    sub getSchema {
669      return $schema_tangram;
670    }
671    
672    sub getCOREHANDLE {
673      my $self = shift;
674      return $self->{_COREHANDLE};
675    }
676    
677    sub dropDb {
678      my $self = shift;
679      my $storage = $self->_getSubLayerHandle();
680      return $storage->dropDb();
681    }
682    
683    sub testAvailability {
684      my $self = shift;
685      my $storage = $self->_getSubLayerHandle();
686      return $storage->testAvailability();
687    }
688    
689  1;  1;
690    __END__
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