/[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 1.40 by joko, Wed Jun 25 22:57:54 2003 UTC
# Line 3  Line 3 
3  #  $Id$  #  $Id$
4  #  #
5  #  $Log$  #  $Log$
6    #  Revision 1.40  2003/06/25 22:57:54  joko
7    #  major rework of "sub sendQuery / sub getListFiltered": now should be capable of "sorting"
8    #
9  #  Revision 1.39  2003/06/06 11:40:40  jonen  #  Revision 1.39  2003/06/06 11:40:40  jonen
10  #  fixed bug at 'getFilteredList'  #  fixed bug at 'getFilteredList'
11  #  #
# Line 499  sub getListFiltered { Line 502  sub getListFiltered {
502    # redirect to unfiltered mode    # redirect to unfiltered mode
503    #return $self->getListUnfiltered(@_);    #return $self->getListUnfiltered(@_);
504    
505    my $nodename = shift;    my $in = {};
506    my $filters = shift;    $in->{nodename} = shift;
507      $in->{filters} = shift;
508      $in->{sorting} = shift;
509      
510    my @results;    my @results;
511    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $nodename . "' )" );    $logger->debug( __PACKAGE__ . "->getListFiltered( nodename => '" . $in->{nodename} . "' )" );
512    
513  #print Dumper($filters);    #print Dumper($filters);
514    
515      # 1. "Remote Object Handle" - get set of objects from odbms by object name
516      my $remote = $self->{_COREHANDLE}->remote($in->{nodename});
517      
518      # 2. Transfer $in to $orm_query
519      my $orm_query = {};
520        
521      # 2.a. Filters
522    my @tfilters;    my @tfilters;
523      my $orm_filter = undef;
524        
525    foreach my $filter (@$filters) {    foreach my $filter (@{$in->{filters}}) {
526        
527      # get filter - TODO: for each filter      # get filter - TODO: for each filter
528      #my $filter = $filters->[0];      #my $filter = $filters->[0];
529      
530      # build filter      # 1. The parts of a filter source entry
531      my $lexpr = $filter->{key};      my $lexpr = $filter->{key};
532      #my $op = $filter->{op};      #my $op = $filter->{op};
533      my $op = '=';      my $op = '=';
534      my $rexpr = $filter->{val};      my $rexpr = $filter->{val};
535      my $tight = 100;      my $tight = 100;
536    
537        # 2. Build filter target entry
538            
539    #  my $tfilter = Tangram::Filter->new(      # Test 1 - didn't work out!
540    #    expr => "t1.$lexpr $op '$rexpr'",      #  my $tfilter = Tangram::Filter->new(
541    #    tight => $tight,      #    expr => "t1.$lexpr $op '$rexpr'",
542    #    objects => $objects,      #    tight => $tight,
543    #  );      #    objects => $objects,
544          #  );
545    
546        my $orm_filter_tmp = undef;
547        # was:
548      # TODO: is_op?      # TODO: is_op?
549      # dispatch un-common operators if exists      # dispatch un-common operators if exists
550      if($filter->{op} eq "ref") {      if ($filter->{op} eq "ref") {
551        # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query        # do nothing, results will be filtered later cause 'tangram-filter' doesn't support 'ref' query
552        #print "Filter->op eq 'ref'.\n";        #print "Filter->op eq 'ref'.\n";
553        #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";        #push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
554      } else {      } else {
555        # 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
556        push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";        #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
557          # better: calculate expression right here!
558          #push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
559          
560          #print "key: ", $filter->{key}, "\n";
561          
562          my $left = $remote->{$filter->{key}};
563          #my $r = Tangram::Expr->new( 'string' => "'" . $filter->{val} . "'" );
564          my $right = $filter->{val};
565          my $op = $filter->{op};
566          $orm_filter_tmp = $left->$op($right);
567        }
568    
569        if (not $orm_filter) {
570          $orm_filter = $orm_filter_tmp;
571        } else {
572          $orm_filter = $orm_filter->and($orm_filter_tmp);
573      }      }
574    
575    }    }
576    
577    my $tfilter = join(' & ', @tfilters);    $orm_query->{filter} = $orm_filter;
578    
   # get set of objects from odbms by object name  
   my $remote = $self->{_COREHANDLE}->remote($nodename);  
     
579    # was:    # was:
   #@results = $self->{COREHANDLE}->select($object_set, $tfilter);  
580    
581    # is:    # 2.b. sorting [new as of 2003-06-17]
582    # HACK: build eval-string (sorry) to get filtered list - please give advice here    if ($in->{sorting}) {
583    my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . ');';      my $sorting_rules = [];
584          my $sorting_order = 'ASC';
585    #print "eval: $evalstring", "\n";      foreach my $sorting_column (keys %{$in->{sorting}}) {
586          $sorting_order = $in->{sorting}->{$sorting_column} if $in->{sorting}->{$sorting_column};
587          push @$sorting_rules, Tangram::Expr->new( 'string' => $sorting_column );
588        }
589        $orm_query->{order} = $sorting_rules;
590        if ($sorting_order eq 'DESC') {
591          $orm_query->{desc} = 1;
592        }
593      }
594    
595    
596      # 3. build and issue query - return result as Tangram::Cursor
597        
598    # get filtered list/set    # coerce hash into array (This is valid in Perl)
599    @results = eval($evalstring);    my @orm_query_args = %$orm_query;
600    die $@ if $@;    # send query (arguments) to orm
601      @results = $self->{_COREHANDLE}->select($remote, @orm_query_args);
602        
603      #my $cursor = $self->{_COREHANDLE}->cursor($remote, @orm_query_args);
604      #return $cursor;
605      #print Dumper(@results);
606    
607      # is:
608      # HACK: build eval-string (sorry) to get filtered list - please give advice here
609        #my $evalstring = 'return $self->{_COREHANDLE}->select($remote, ' . $tfilter . $sorting . ');';
610        #print "eval: $evalstring", "\n";
611        # get filtered list/set
612        #@results = eval($evalstring);
613        #die $@ if $@;
614    
615    =pod
616    # filter results    # filter results
617    if($filters->[0]->{op} eq "ref") {    if ($filters->[0]->{op} && ($filters->[0]->{op} eq "ref")) {
618        #print "Filter->op eq 'ref'.\n";        #print "Filter->op eq 'ref'.\n";
619        my $att_name = $filters->[0]->{key};        my $att_name = $filters->[0]->{key};
620        my $att_val = $filters->[0]->{val};        my $att_val = $filters->[0]->{val};
# Line 571  sub getListFiltered { Line 626  sub getListFiltered {
626        }        }
627        @results = @filtered;        @results = @filtered;
628    }    }
629    =cut
630    
631    #print "results: " . Dumper(\@results);    #print "results: " . Dumper(\@results);
632        
# Line 602  sub createSet { Line 658  sub createSet {
658    return $result;    return $result;
659  }  }
660    
661    sub createResult {
662      my $self = shift;
663      my $rh = shift;
664      my $result = Data::Storage::Result::Tangram->new( RESULTHANDLE => $rh );
665      return $result;
666    }
667    
668  sub sendQuery {  sub sendQuery {
669    my $self = shift;    my $self = shift;
670    my $query = shift;    my $query = shift;
# Line 693  sub sendQuery { Line 756  sub sendQuery {
756    
757      if ($crud eq 'RETRIEVE') {      if ($crud eq 'RETRIEVE') {
758    
759        my $list = $self->getListFiltered($query->{node}, $query->{criterias});        my $list = $self->getListFiltered($query->{node}, $query->{criterias}, $query->{sorting});
760          #return $list;
761          return $self->createResult($list);
762          
763        #return $self->createSet($object);        #return $self->createSet($object);
764        #return $self->createSet($list);        #return $self->createSet($list);
765        return $self->createSet(@$list);        return $self->createSet(@$list);
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