/[cvs]/nfo/perl/libs/Data/Storage/Handler/Tangram.pm
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revision 1.39 by jonen, Fri Jun 6 11:40:40 2003 UTC revision 1.43 by jonen, Wed Jul 2 11:07:12 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.43  2003/07/02 11:07:12  jonen
7    #  re-activate filtering of results *after* results are fetched from tangram
8    #    (needed for e.g. UserManagment)
9    #
10    #  Revision 1.42  2003/07/01 23:24:17  joko
11    #  now using package before using function
12    #
13    #  Revision 1.41  2003/06/29 02:03:45  joko
14    #  fix:? initialize schema on startup
15    #
16    #  Revision 1.40  2003/06/25 22:57:54  joko
17    #  major rework of "sub sendQuery / sub getListFiltered": now should be capable of "sorting"
18    #
19  #  Revision 1.39  2003/06/06 11:40:40  jonen  #  Revision 1.39  2003/06/06 11:40:40  jonen
20  #  fixed bug at 'getFilteredList'  #  fixed bug at 'getFilteredList'
21  #  #
# Line 160  use base ("Data::Storage::Handler::Abstr Line 173  use base ("Data::Storage::Handler::Abstr
173    
174  use Data::Dumper;  use Data::Dumper;
175  use Tangram;  use Tangram;
176    use Class::Tangram;
177    
178  use DesignPattern::Object;  use DesignPattern::Object;
179  use Data::Storage::Result::Tangram;  use Data::Storage::Result::Tangram;
# Line 187  sub _initSchema { Line 201  sub _initSchema {
201    #if (!$schema_tangram) {    #if (!$schema_tangram) {
202      #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} } );
203      my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );      my $obj = DesignPattern::Object->fromPackage($self->{locator}->{schema}, { 'EXPORT_OBJECTS' => $self->{locator}->{classnames}, 'want_transactions' => $self->{locator}->{want_transactions} } );
204      $schema_tangram = $obj->getSchema();      $schema_tangram = $obj->getSchema() if $obj;
205    #}    #}
206    if (!$schema_tangram) {    if (!$schema_tangram) {
207      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{schema}" );      $logger->error( __PACKAGE__ . "->_initSchema: No Schema available for $self->{locator}->{schema}." );
208      return 0;      return 0;
209    }    }
210    #$self->_patchSchema();    #$self->_patchSchema();
# Line 236  sub connect { Line 250  sub connect {
250  #      return;  #      return;
251  #    }  #    }
252    
253      #return unless $self->_initSchema();      return unless $self->_initSchema();
254      $self->_initSchema();      #$self->_initSchema();
255    
256      # create the main tangram storage object      # create the main tangram storage object
257      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );      #$self->{COREHANDLE} = Tangram::Relational->connect( $schema, $dsn );
# Line 499  sub getListFiltered { Line 513  sub getListFiltered {
513    # redirect to unfiltered mode    # redirect to unfiltered mode
514    #return $self->getListUnfiltered(@_);    #return $self->getListUnfiltered(@_);
515    
516    my $nodename = shift;    my $in = {};
517    my $filters = shift;    $in->{nodename} = shift;
518      $in->{filters} = shift;
519      $in->{sorting} = shift;
520      
521    my @results;    my @results;
522    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $in->{nodename} . "' )" );
523    
524      #print Dumper($filters);
525    
526  #print Dumper($filters);    # 1. "Remote Object Handle" - get set of objects from odbms by object name
527      my $remote = $self->{_COREHANDLE}->remote($in->{nodename});
528        
529      # 2. Transfer $in to $orm_query
530      my $orm_query = {};
531      
532      # 2.a. Filters
533    my @tfilters;    my @tfilters;
534      my $orm_filter = undef;
535        
536    foreach my $filter (@$filters) {    foreach my $filter (@{$in->{filters}}) {
537        
538      # get filter - TODO: for each filter      # get filter - TODO: for each filter
539      #my $filter = $filters->[0];      #my $filter = $filters->[0];
540      
541      # build filter      # 1. The parts of a filter source entry
542      my $lexpr = $filter->{key};      my $lexpr = $filter->{key};
543      #my $op = $filter->{op};      #my $op = $filter->{op};
544      my $op = '=';      my $op = '=';
545      my $rexpr = $filter->{val};      my $rexpr = $filter->{val};
546      my $tight = 100;      my $tight = 100;
547    
548        # 2. Build filter target entry
549            
550    #  my $tfilter = Tangram::Filter->new(      # Test 1 - didn't work out!
551    #    expr => "t1.$lexpr $op '$rexpr'",      #  my $tfilter = Tangram::Filter->new(
552    #    tight => $tight,      #    expr => "t1.$lexpr $op '$rexpr'",
553    #    objects => $objects,      #    tight => $tight,
554    #  );      #    objects => $objects,
555          #  );
556    
557        my $orm_filter_tmp = undef;
558        # was:
559      # TODO: is_op?      # TODO: is_op?
560      # dispatch un-common operators if exists      # dispatch un-common operators if exists
561      if($filter->{op} eq "ref") {      if ($filter->{op} eq "ref") {
562        # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query        # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query
563        #print "Filter->op eq 'ref'.\n";        #print "Filter->op eq 'ref'.\n";
564        #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";        #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
565      } else {      } else {
566        # 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
567        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";        #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
568          # better: calculate expression right here!
569          #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
570          
571          #print "key: ", $filter->{key}, "\n";
572          
573          my $left = $remote->{$filter->{key}};
574          #my $r = Tangram::Expr->new( 'string' => "'" . $filter->{val} . "'" );
575          my $right = $filter->{val};
576          my $op = $filter->{op};
577          $orm_filter_tmp = $left->$op($right);
578        }
579    
580        if (not $orm_filter) {
581          $orm_filter = $orm_filter_tmp;
582        } else {
583          $orm_filter = $orm_filter->and($orm_filter_tmp);
584      }      }
585    
586    }    }
587    
588    my $tfilter = join(' & ', @tfilters);    $orm_query->{filter} = $orm_filter;
589    
   # get set of objects from odbms by object name  
   my $remote = $self->{_COREHANDLE}->remote($nodename);  
     
590    # was:    # was:
   #@results = $self->{COREHANDLE}->select($object_set, $tfilter);  
591    
592    # is:    # 2.b. sorting [new as of 2003-06-17]
593    # HACK: build eval-string (sorry) to get filtered list - please give advice here    if ($in->{sorting}) {
594    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';      my $sorting_rules = [];
595          my $sorting_order = 'ASC';
596    #print "eval: $evalstring", "\n";      foreach my $sorting_column (keys %{$in->{sorting}}) {
597          $sorting_order = $in->{sorting}->{$sorting_column} if $in->{sorting}->{$sorting_column};
598          push @$sorting_rules, Tangram::Expr->new( 'string' => $sorting_column );
599        }
600        $orm_query->{order} = $sorting_rules;
601        if ($sorting_order eq 'DESC') {
602          $orm_query->{desc} = 1;
603        }
604      }
605    
606    
607      # 3. build and issue query - return result as Tangram::Cursor
608        
609    # get filtered list/set    # coerce hash into array (This is valid in Perl)
610    @results = eval($evalstring);    my @orm_query_args = %$orm_query;
611    die $@ if $@;    # send query (arguments) to orm
612      @results = $self->{_COREHANDLE}->select($remote, @orm_query_args);
613        
614      #my $cursor = $self->{_COREHANDLE}->cursor($remote, @orm_query_args);
615      #return $cursor;
616      #print Dumper(@results);
617    
618    # filter results    # is:
619    if($filters->[0]->{op} eq "ref") {    # HACK: build eval-string (sorry) to get filtered list - please give advice here
620        #my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . $sorting . ');';
621        #print "eval: $evalstring", "\n";
622        # get filtered list/set
623        #@results = eval($evalstring);
624        #die $@ if $@;
625    
626      # filter results - NEEDED for e.g. UserManagment !!
627      if ($in->{filters}->[0]->{op} && ($in->{filters}->[0]->{op} eq "ref")) {
628        #print "Filter->op eq 'ref'.\n";        #print "Filter->op eq 'ref'.\n";
629        my $att_name = $filters->[0]->{key};        my $att_name = $in->{filters}->[0]->{key};
630        my $att_val = $filters->[0]->{val};        my $att_val = $in->{filters}->[0]->{val};
631        my @filtered;        my @filtered;
632        foreach(@results) {        foreach(@results) {
633          if(ref($_->{$att_name}) eq $att_val) {          if(ref($_->{$att_name}) eq $att_val) {
# Line 602  sub createSet { Line 667  sub createSet {
667    return $result;    return $result;
668  }  }
669    
670    sub createResult {
671      my $self = shift;
672      my $rh = shift;
673      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
674      return $result;
675    }
676    
677  sub sendQuery {  sub sendQuery {
678    my $self = shift;    my $self = shift;
679    my $query = shift;    my $query = shift;
# Line 693  sub sendQuery { Line 765  sub sendQuery {
765    
766      if ($crud eq 'RETRIEVE') {      if ($crud eq 'RETRIEVE') {
767    
768        my $list = $self->getListFiltered($query->{node}, $query->{criterias});        my $list = $self->getListFiltered($query->{node}, $query->{criterias}, $query->{sorting});
769          #return $list;
770          return $self->createResult($list);
771          
772        #return $self->createSet($object);        #return $self->createSet($object);
773        #return $self->createSet($list);        #return $self->createSet($list);
774        return $self->createSet(@$list);        return $self->createSet(@$list);
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