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## $Id: Metadata.pm,v 1.1 2003/01/20 16:58:46 joko Exp $ |
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## |
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## Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de> |
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## |
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## See COPYRIGHT section in pod text below for usage and distribution rights. |
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## |
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## ---------------------------------------------------------------------------------------- |
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## $Log: Metadata.pm,v $ |
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## Revision 1.1 2003/01/20 16:58:46 joko |
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## + initial check-in: here they are.... |
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## |
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## Revision 1.1 2003/01/19 01:23:04 joko |
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## + new from Data/Transfer/Sync.pm |
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## |
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## ---------------------------------------------------------------------------------------- |
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package Data::Transfer::Sync::Metadata; |
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use strict; |
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use warnings; |
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use mixin::with qw( Data::Transfer::Sync ); |
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# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - main |
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# get logger instance |
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my $logger = Log::Dispatch::Config->instance; |
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use Data::Dumper; |
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# TODO: refactor (still)!!! take this list from already established/given metadata .... |
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# .... also internally: passing around and mungling these metadata doesn't make sense anymore. |
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sub options2metadata { |
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my $self = shift; |
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$logger->debug( __PACKAGE__ . "->transformMetadata" ); |
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#print Dumper($self->{options}); |
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# decompose identifiers and write to metadata (for each descent) |
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foreach ('source', 'target') { |
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# get/set metadata for further processing |
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$self->{options}->{$_}->{dbKey} ||= ''; |
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$self->{options}->{$_}->{nodeType} ||= ''; |
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$self->{options}->{$_}->{nodeName} ||= ''; |
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# Partner and Node (compare the V1-notations: "L:Country" or "R:countries.csv") |
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$self->{meta}->{$_}->{dbKey} = $self->{options}->{$_}->{dbKey}; |
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$self->{meta}->{$_}->{nodeType} = $self->{options}->{$_}->{nodeType}; |
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$self->{meta}->{$_}->{nodeName} = $self->{options}->{$_}->{nodeName}; |
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# Filter |
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if (my $item_filter = $self->{args}->{$_ . '_filter'}) { |
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$self->{meta}->{$_}->{filter} = $item_filter; |
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} |
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# IdentProvider |
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if (my $item_ident = $self->{options}->{$_}->{ident}) { |
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my @item_ident = split(':', $item_ident); |
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$self->{meta}->{$_}->{IdentProvider} = { method => $item_ident[0], arg => $item_ident[1] }; |
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} |
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# TODO: ChecksumProvider |
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# already inside {options} - get it out from there and put into {meta} here! |
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# exclude properties/subnodes |
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if (my $item_exclude = $self->{options}->{$_}->{exclude}) { |
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$self->{meta}->{$_}->{subnodes_exclude} = $item_exclude; |
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} |
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# TypeProvider |
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if (my $item_type = $self->{args}->{$_ . '_type'}) { |
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my @item_type = split(':', $item_type); |
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$self->{meta}->{$_}->{TypeProvider} = { method => $item_type[0], arg => $item_type[1] }; |
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} |
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# Callbacks - writers (will be triggered _before_ writing to target) |
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if (my $item_writers = $self->{args}->{$_ . '_callbacks_write'}) { |
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my $descent = $_; # this is important since the following code inside the map wants to use its own context variables |
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map { $self->{meta}->{$descent}->{Callback}->{write}->{$_}++; } @$item_writers; |
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} |
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# Callbacks - readers (will be triggered _after_ reading from source) |
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if (my $item_readers = $self->{args}->{$_ . '_callbacks_read'}) { |
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my $descent = $_; |
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map { $self->{meta}->{$descent}->{Callback}->{read}->{$_}++; } @$item_readers; |
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} |
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# resolve storage objects |
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$self->{meta}->{$_}->{storage} = $self->{options}->{$_}->{storage}->{handle}; |
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} |
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#print Dumper($self->{meta}); |
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return 1; |
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} |
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sub options2metadata_accessor { |
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my $self = shift; |
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$logger->debug( __PACKAGE__ . "->_transformMetadata_accessor" ); |
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# build accessor metadata (for each descent) |
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foreach my $descent ('source', 'target') { |
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# the database type plays a role here to handle special nodesets: |
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# there may be a) childless/non-strict nodesets (e.g. a CSV-file) |
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# or b) normal ones - here the node-name corresponds more or less directly to |
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# the physical location in the storage hierarchy below us (e.g. MAPI or LDAP) |
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# or c) sets of nodes which are physically mapped by node-type (e.g. a RDBMS or a ODBMS) |
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my $dbType = $self->{meta}->{$descent}->{storage}->{locator}->{type}; |
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# a, b and c are "accessor-type"s (of 'none', 'node-name', 'node-type') |
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# the following code resolves these types to '$accessorType' |
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# and properly sets '$accessorName' |
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# don't continue for certain storage handlers |
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# HACK for DBD::CSV - re-enable for other DBDs |
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#next if $dbType eq 'DBI'; |
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# get nodename |
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# get node-name |
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my $nodename = $self->{meta}->{$descent}->{node}; # V1 |
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$nodename ||= $self->{meta}->{$descent}->{nodeName}; # V2 |
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# check if nodename is actually a CODEref, execute it to get a mapped/filtered target-nodename |
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#print "----", ref $nodename, "\n"; |
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#if ($nodename =~ m/CODE/) { |
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# print Dumper($self); |
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# #exit; |
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# $nodename = $nodename->($nodename); |
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#} |
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# determine nodeset accessor -type and -name |
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# defaults |
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my $accessorType = 'none'; |
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my $accessorName = ''; |
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# if explicit address was given in options, just use it! |
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if (my $address = $self->{options}->{$descent}->{address}) { |
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$accessorType = 'direct-address'; |
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$accessorName = $address; |
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} |
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# c) |
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elsif (($dbType eq 'DBI' || $dbType eq 'Tangram') && $self->{meta}->{$descent}->{nodeType}) { |
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$accessorType = 'node-type'; |
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$accessorName = $self->{meta}->{$descent}->{nodeType}; |
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} |
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# b) |
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elsif ($nodename) { |
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$accessorType = 'node-name'; |
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$accessorName = $nodename; |
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} |
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# write accessor information to metadata |
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$self->{meta}->{$descent}->{accessorType} = $accessorType; |
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$self->{meta}->{$descent}->{accessorName} = $accessorName; |
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} |
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# trace |
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#print Dumper($self->{meta}); |
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#print Dumper($self->{options}); |
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#exit; |
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} |
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sub buildAttributeMap { |
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my $self = shift; |
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# field-structure for building sql |
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# mapping of sql-fieldnames to object-attributes |
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$self->{node}->{map} = {}; |
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# manually set ... |
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# ... object-id |
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$self->{node}->{map}->{$self->{meta}->{target}->{IdentProvider}->{arg}} = $self->{node}->{source}->{ident}; |
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# ... checksum |
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$self->{node}->{map}->{cs} = $self->{node}->{source}->{checksum}; |
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#print "sqlmap: ", Dumper($self->{node}->{map}), "\n"; |
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#print Dumper($self); |
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#exit; |
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# for transferring flat structures via simple (1:1) mapping |
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# TODO: diff per property / property value |
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#if ($self->{args}->{mapping}) { |
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# apply mapping from $self->{args}->{mapping} to $self->{node}->{map} |
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#foreach my $key (@{$self->{meta}->{source}->{childnodes}}) { |
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my @childnodes = @{$self->{meta}->{source}->{childnodes}}; |
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for (my $mapidx = 0; $mapidx <= $#childnodes; $mapidx++) { |
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#my $map_right = $self->{args}->{mapping}->{$key}; |
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$self->{node}->{source}->{propcache} = {}; |
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$self->{node}->{target}->{propcache} = {}; |
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# get property name |
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$self->{node}->{source}->{propcache}->{property} = $self->{meta}->{source}->{childnodes}->[$mapidx]; |
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$self->{node}->{target}->{propcache}->{property} = $self->{meta}->{target}->{childnodes}->[$mapidx]; |
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#print "map: $map_right", "\n"; |
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# get property value |
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my $value; |
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# detect for callback - old style - (maybe the better???) |
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if (ref($self->{node}->{target}->{map}) eq 'CODE') { |
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#$value = &$map_right($objClone); |
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} else { |
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# plain (scalar?) value |
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#$value = $objClone->{$map_right}; |
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$self->{node}->{source}->{propcache}->{value} = $self->{node}->{source}->{payload}->{$self->{node}->{source}->{propcache}->{property}}; |
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} |
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#$self->{node}->{map}->{$key} = $value; |
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# detect expression |
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# for transferring deeply nested structures described by expressions |
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#print "val: $self->{node}->{source}->{propcache}->{value}", "\n"; |
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if ($self->{node}->{source}->{propcache}->{property} =~ s/^expr://) { |
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# create an anonymous sub to act as callback target dispatcher |
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my $cb_dispatcher = sub { |
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#print "=============== CALLBACK DISPATCHER", "\n"; |
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#print "ident: ", $self->{node}->{source}->{ident}, "\n"; |
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#return $self->{node}->{source}->{ident}; |
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}; |
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#print Dumper($self->{node}); |
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# build callback map for helper function |
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#my $cbmap = { $self->{meta}->{source}->{IdentProvider}->{arg} => $cb_dispatcher }; |
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my $cbmap = {}; |
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my $value = refexpr2perlref($self->{node}->{source}->{payload}, $self->{node}->{source}->{propcache}->{property}, $cbmap); |
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$self->{node}->{source}->{propcache}->{value} = $value; |
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} |
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# encode values dependent on type of underlying storage here - expand cases... |
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my $storage_type = $self->{meta}->{target}->{storage}->{locator}->{type}; |
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if ($storage_type eq 'DBI') { |
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# ...for sql |
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# quotemeta? |
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$self->{node}->{source}->{propcache}->{value} = quotesql($self->{node}->{source}->{propcache}->{value}); |
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} elsif ($storage_type eq 'Tangram') { |
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# iso? utf8 already possible? |
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} elsif ($storage_type eq 'LDAP') { |
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# TODO: encode utf8 here? |
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} |
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# store value to transfer map |
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$self->{node}->{map}->{$self->{node}->{target}->{propcache}->{property}} = $self->{node}->{source}->{propcache}->{value}; |
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} |
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#} |
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# TODO: $logger->dump( ... ); |
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#$logger->debug( "sqlmap:" . "\n" . Dumper($self->{node}->{map}) ); |
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#print "sqlmap: ", Dumper($self->{node}->{map}), "\n"; |
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#print "entrystatus: ", Dumper($self->{node}), "\n"; |
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} |
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1.1 |
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1; |
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