--- nfo/perl/libs/Data/Storage/Handler/Tangram.pm	2003/03/27 15:31:14	1.30
+++ nfo/perl/libs/Data/Storage/Handler/Tangram.pm	2003/04/19 16:09:48	1.35
@@ -1,8 +1,24 @@
 ############################################
 #
-#  $Id: Tangram.pm,v 1.30 2003/03/27 15:31:14 joko Exp $
+#  $Id: Tangram.pm,v 1.35 2003/04/19 16:09:48 jonen Exp $
 #
 #  $Log: Tangram.pm,v $
+#  Revision 1.35  2003/04/19 16:09:48  jonen
+#  + added operator dispatching (currently for getting ref-type) at 'getListFiltered'
+#
+#  Revision 1.34  2003/04/11 01:18:53  joko
+#  sendQuery:
+#  + introduced crud action 'DELETE'
+#
+#  Revision 1.33  2003/04/09 06:07:43  joko
+#  revamped 'sub sendQuery'
+#
+#  Revision 1.32  2003/04/08 22:52:22  joko
+#  modified 'querySchema': better behaviour regarding filtering result
+#
+#  Revision 1.31  2003/04/05 21:24:09  joko
+#  modified 'sub getChildNodes': now contains code from 'querySchema'
+#
 #  Revision 1.30  2003/03/27 15:31:14  joko
 #  fixes to modules regarding new namespace(s) below Data::Mungle::*
 #
@@ -131,7 +147,7 @@
 use DesignPattern::Object;
 use Data::Storage::Result::Tangram;
 use Data::Mungle::Compare::Struct qw( isEmpty );
-use Data::Mungle::Transform::Deep qw( expand );
+use Data::Mungle::Transform::Deep qw( expand deep_copy merge_to );
 
 # get logger instance
 my $logger = Log::Dispatch::Config->instance;
@@ -231,33 +247,64 @@
 sub getChildNodes {
 
   my $self = shift;
-  my @nodes;
+  my $mode = shift;
+  my $filter = shift;
+  
+  $mode ||= 'core';
+  $filter ||= 'all';
+  
+  $logger->debug( __PACKAGE__ . "->getChildNodes($mode)" );
 
-  $logger->debug( __PACKAGE__ . "->getChildNodes()" );
+  if ($mode eq 'core') {
 
-  # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
-  #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
-  #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
-  
-  # todo: should we retrieve information from the schema here
-  # rather than poorly getting table names from underlying dbi?
-  my $storage = $self->_getSubLayerHandle();
-  @nodes = @{$storage->getChildNodes()};
-  #$storage->_configureCOREHANDLE();
-#print "getchildnodes\n";
-#print Dumper($self);
-  #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
+    my @nodes;
+    
+    # create new DBI - Data::Storage - object from already connected DBI::db - handle inside the current COREHANDLE
+    #my $loc = new Data::Storage::Locator( type => "DBI", dbi => { db => $self->{COREHANDLE}->{db} });
+    #my $loc = new Data::Storage::Locator( type => "DBI", COREHANDLE => $self->{COREHANDLE}->{db} );
+    
+    # todo: should we retrieve information from the schema here
+    # rather than poorly getting table names from underlying dbi?
+    my $storage = $self->_getSubLayerHandle();
+    @nodes = @{$storage->getChildNodes()};
+    #$storage->_configureCOREHANDLE();
+  #print "getchildnodes\n";
+  #print Dumper($self);
+    #if (my $result = $self->sendCommand( 'SHOW TABLES;' ) ) {
+    
+    # TODO: REVIEW
+    #$storage->disconnect();
+    
+    $self->{meta}->{childnodes} = \@nodes;
+
+    return \@nodes;
   
-  # TODO: REVIEW
-  #$storage->disconnect();
+  } elsif ($mode eq 'root') {
+    
+    # FIXME: this will return *all* known classes to 'Class::Tangram',
+    # which might not be what you expect since more than one instance
+    # of Tangram may be in memory and Class::Tangram seems to 
+    # offer no methods to determine this or filter its result(s) according
+    # to a specific database.
+    my @object_names = Class::Tangram::known_classes();
+    my @concret_names;
+    my $o_cnt;
+    foreach (sort @object_names) {
+      push @concret_names, $_  if (!Class::Tangram::class_is_abstract($_));
+      $o_cnt++;
+    }
+
+    if ($filter eq 'all') {
+      return \@object_names;
+    } elsif ($filter eq 'concrete') {
+      return \@concret_names;
+    }
   
-  $self->{meta}->{childnodes} = \@nodes;
+  }
   
-  return \@nodes;
 
 }
 
-
 sub testIntegrity {
 
   my $self = shift;
@@ -462,8 +509,14 @@
   #    objects => $objects,
   #  );
   
-    # HACK: build eval-string (sorry) to get filtered list - please give advice here
-    push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
+    # TODO: is_op?
+    # dispatch un-common operators if exists
+    if($filter->{op} eq "ref") {
+      push @tfilters, 'ref($remote->{' . $filter->{key} . '})' . " eq '$filter->{val}'";
+    } else {
+      # HACK: build eval-string (sorry) to get filtered list - please give advice here
+      push @tfilters, '$remote->{' . $filter->{key} . '}' . " $filter->{op} '$filter->{val}'";
+    }
 
   }
 
@@ -516,57 +569,157 @@
 sub sendQuery {
   my $self = 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);
 
   #print Dumper($query);
 
-  # HACK: special case: querying by id does not translate into a common tangram query
-  # just load the object by given id(ent)
-  if ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq') {
-    #print "LOAD!!!", "\n";
-    #exit;
-    #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
-    my $ident = $query->{criterias}->[0]->{val};
-#print "load obj", "\n";
-    #return $self->createSet() if $ident == 5;
-    $self->{_COREHANDLE}->unload($ident);
-    my $object = $self->{_COREHANDLE}->load($ident);
-#print "get id", "\n";
-    my $oid = $self->{_COREHANDLE}->id($object);
-#print Dumper($object);
-#print "oid: $oid", "\n";
-    return $self->createSet($object);
-    #return $self->createSet( $self->{COREHANDLE}->load('300090018') );
-  }
-
-  my $list = $self->getListFiltered($query->{node}, $query->{criterias});
-  #return $self->createSet($object);
-  #return $self->createSet($list);
-  return $self->createSet(@$list);
-
-  #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
+  # type = ITEM|LIST|TRANSPARENT
+  my $type = '';
+  # mode = OID|SPECIAL
+  my $mode = '';
+  my $ident = '';
+  my $crud = '';
+  
+  
+  # dispatch type and mode
+  
+    # defaults - 1
+    if ($query->{options}) {
+      $crud = $query->{options}->{crud};
+      $crud ||= $query->{options}->{action};
+    }
+
+    # defaults - 2
+    $type ||= 'TRANSPARENT'; 
+    $crud ||= 'RETRIEVE';
+
+    if ($query->{options}->{OID}) {
+      $type = 'ITEM';
+      $mode = 'OID';
+      $ident = $query->{options}->{OID};
+    
+    } elsif (my $guid = $query->{options}->{GUID}) {
+      $type = 'TRANSPARENT';
+      $query->{criterias} = [ { key => 'guid', op => 'eq', val => $guid } ];    
+
+    # if operator is different (dispatcher for 'getListFiltered')
+    } elsif (my $op = $query->{options}->{op}) {
+      $type = 'TRANSPARENT';
+      $query->{criterias} = [ { key => $query->{options}->{meta_label}, op => $op, val => $query->{options}->{meta_value} } ];    
+
+    }
+  
+    # HACK: special case: querying by id does not translate into a common tangram query
+    # just load the object by given identifier (OID) named 'id' - this is required by Data::Transfer::Sync!
+    if ($query->{criterias} && ($query->{criterias}->[0]->{key} eq 'id' && $query->{criterias}->[0]->{op} eq 'eq')) {
+      $type = 'ITEM';
+      $mode = 'SPECIAL.SYNC';
+      $ident = $query->{criterias}->[0]->{val};
+    }
+  
+
+  # execute query
+  my $result;
 
+  if ($type eq 'ITEM' && $ident) {
 
+    if ($mode eq 'OID') {    
+      # TODO: review this case!
+      $result = $self->getObject($ident, $query->{options});
+    
+    } elsif ($mode eq 'SPECIAL.SYNC') {
+
+      # V1 - failed
+      #return Set::Object->new( $self->{COREHANDLE}->load($query->{criterias}->[0]->{val}) );
+  
+      # hmm....
+      #return $self->createSet() if $ident == 5;
+      
+      # Unload single object before doing any further operations to 
+      # expect a "fresh" object from orm when performing the next calls.
+      $self->{_COREHANDLE}->unload($ident);
+      
+      # Load object from orm.
+      my $object = $self->{_COREHANDLE}->load($ident);
+  
+      # determine object identifier (OID)
+      my $oid = $self->{_COREHANDLE}->id($object);
+      
+      # encapsulate into result/response container and return this one
+      $result = $self->createSet($object);
+      
+      # debugging
+      #$result = $self->createSet( $self->{COREHANDLE}->load('300090018') );
+
+    }
+    
+  
+  } elsif ($type eq 'TRANSPARENT') {
 
+    if ($crud eq 'RETRIEVE') {
+
+      my $list = $self->getListFiltered($query->{node}, $query->{criterias});
+      #return $self->createSet($object);
+      #return $self->createSet($list);
+      return $self->createSet(@$list);
+    
+      #die("This should not be reached for now - redirect to \$self->getListFiltered() here!");
+    
+      # try a generic tangram query here
+      # TODO: try to place an oql on top of that (search.cpan.org!)
+      my @crits;
+      foreach (@{$query->{criterias}}) {
+        my $op = '';
+        $op = '=' if lc $_->{op} eq 'eq';
+        push @crits, "$_->{key}$op'$_->{val}'";
+      }
+      my $subnodes = {};
+      map { $subnodes->{$_}++ } @{$query->{subnodes}};
+      # HACK: this is hardcoded ;(    expand possibilities!
+      #my $crit = join(' AND ', @crits);
+      #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
+      #return $self->sendCommand($sql);
+      #my $h = $self->{COREHANDLE}->remote($query->{node});
+      #my $res = $self->{COREHANDLE}->select($h, $h->{);
+      $result = $self->createCursor($query->{node});
+
+    } elsif ($crud eq 'UPDATE') {
+
+      # Patch current query to be a loader (e.g. change action, remove payload) ...
+      my $childquery = deep_copy($query);
+      $childquery->{options}->{crud} = 'RETRIEVE';
+      delete $childquery->{payload};
+
+      # ... to use it to fetch a fresh object using ourselves (sendQuery).
+      my $cursor = $self->sendQuery($childquery);
+      my $status = $cursor->getStatus();
+      my $object = $cursor->getNextEntry();
+
+      # Merge values and apply value modifiers.
+      my $options = { utf8 => 1, php => 1 };
+      merge_to($object, $query->{payload}, $options);
+
+      # Execute update operation at orm.
+      $self->update($object);
+    
+    } elsif ($crud eq 'DELETE') {
+
+      # Patch current query to be a loader (e.g. change action) ...
+      my $childquery = deep_copy($query);
+      $childquery->{options}->{crud} = 'RETRIEVE';
+
+      # ... to use it to fetch a fresh object using ourselves (sendQuery).
+      my $cursor = $self->sendQuery($childquery);
+      my $status = $cursor->getStatus();
+      my $object = $cursor->getNextEntry();
+
+      $self->erase($object);
+
+    }
+
+  }
+
+  return $result;
 
-  # try a generic tangram query here
-  # TODO: try to place an oql on top of that (search.cpan.org!)
-  my @crits;
-  foreach (@{$query->{criterias}}) {
-    my $op = '';
-    $op = '=' if lc $_->{op} eq 'eq';
-    push @crits, "$_->{key}$op'$_->{val}'";
-  }
-  my $subnodes = {};
-  map { $subnodes->{$_}++ } @{$query->{subnodes}};
-  # HACK: this is hardcoded ;(    expand possibilities!
-  #my $crit = join(' AND ', @crits);
-  #my $sql = hash2Sql($query->{node}, $subnodes, 'SELECT', $crit);
-  #return $self->sendCommand($sql);
-  #my $h = $self->{COREHANDLE}->remote($query->{node});
-  #my $res = $self->{COREHANDLE}->select($h, $h->{);
-  return $self->createCursor($query->{node});
 }
 
 sub eraseAll {
@@ -602,7 +755,7 @@
   return $object if $object;
 }
 
-sub getObjectByGuid {
+sub getObjectByGuid_old {
   my $self = shift;
   my $guid = shift;
   my $options = shift;
@@ -632,7 +785,7 @@
   
 }
 
-sub getObjectAsHash {
+sub getObjectAsHash_old {
   my $self = shift;
   my $oid = shift;
   my $options = shift;