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## $Id: Metadata.pm,v 1.6 2003/03/28 03:08:17 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 associated pod text |
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## or 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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## |
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## ------------------------------------------------------------------------- |
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package Data::Transfer::Sync::Map; |
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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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use Data::Dumper; |
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use shortcuts::database qw( quotesql ); |
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use Data::Mungle::Code::Ref qw( ref_slot ); |
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# get logger instance |
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my $logger = Log::Dispatch::Config->instance; |
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# This actually - but virtually - maps data from scope to scope.!? |
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# Physical injection/modification doesn't occour here! This is the job of the core/engine. |
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sub buildAttributeMap { |
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my $self = shift; |
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# Field-structure for building sql mapping of sql-fieldnames to object-attributes. |
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# This is fed to "shortcuts::database::hash2sql" somewhere later... (outside this method). |
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$self->{node}->{map} = {}; |
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# Manually inject into target map: ... |
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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} = $self->{node}->{source}->{checksum}; |
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# debug point |
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#print "sqlmap: ", Dumper($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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# Apply mapping from $self->{args}->{mapping} to $self->{node}->{map}. |
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#if ($self->{args}->{mapping}) { |
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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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# deprecated? |
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#my $map_right = $self->{args}->{mapping}->{$key}; |
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#print "map: $map_right", "\n"; |
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# Clear caching containers. |
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$self->{node}->{source}->{propcache} = {}; |
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$self->{node}->{target}->{propcache} = {}; |
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# A - Transfer name/value pairs from distinct source and target objects to single local cache container "propcache". |
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# get property name |
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$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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# get property value |
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my $value; |
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# 1. Detect for callback - deprecated / old style - (maybe the better???) |
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if (ref($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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# B - Inspect the property for special cases: |
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# a) expr:{expression} - encoded expression should be resolved by "ref_slot" |
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# b) code:{symbol} - encoded symbol should be resolved (used) as object method at runtime |
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# B.1. Detect expression for transferring deeply nested structures described by expressions |
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# e.g.: "expr:event->startDateTime" should assume "event" being an |
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# object-reference and get its (hopefully scalar) attribute value "startDateTime". |
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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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# debug point |
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#print Dumper($self->{node}); |
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# V1 - 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 $self->{node}->{source}->{ident}; |
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}; |
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# V2 - build callback map for helper function |
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#print Dumper($self->{node}->{source}->{payload}); |
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#my $cbmap = { $self->{meta}->{source}->{IdentProvider}->{arg} => $cb_dispatcher }; |
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my $cbmap = {}; |
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my $value = ref_slot($self->{node}->{source}->{payload}, $self->{node}->{source}->{propcache}->{property}, $cbmap); |
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# new of 2003-05-12: Assertion: assume ref_slot resolves to scalar. (no ref!) |
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# Otherwise: Invalidate virtual object completely (skip sync). |
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#print "val: $value", "\n"; |
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#if ($value =~ m/HASH/) { |
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# print Dumper($self->{node}->{source}->{payload}); |
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#} |
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return if ref $value; |
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$self->{node}->{source}->{propcache}->{value} = $value; |
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} |
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# B.2. FIXME: Get detection for coderefs / runtime-symbols from API::_prepareOptions(...) into this place! |
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# C - Value encoding |
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# encode values dependent on type of underlying storage here - expand cases... |
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# TODO: Handle encoding from/to quote.sql, quote.meta, utf-8, latin, ascii in a more generic/abstract way here! |
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# Hint: utf-8 encoding is *essential* for XML marshalling. By now we do it manually somewhere else, |
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# but keep in mind when redesigning this interface, that encoding also might be handled by external modules as well... |
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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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$self->{node}->{source}->{propcache}->{value} = |
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quotesql($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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# D - Finally transfer name/value pair to target map |
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# store value to transfer map |
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$self->{node}->{map}->{$self->{node}->{target}->{propcache}->{property}} = |
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$self->{node}->{source}->{propcache}->{value}; |
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} |
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#} |
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# debug point |
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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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# signal good |
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return 1; |
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} |
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1; |
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__END__ |
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