1 package SQL::Translator::XMI::Parser;
3 # -------------------------------------------------------------------
4 # $Id: Parser.pm,v 1.6 2003-10-01 17:45:47 grommit Exp $
5 # -------------------------------------------------------------------
6 # Copyright (C) 2003 Mark Addison <mark.addison@itn.co.uk>,
8 # This program is free software; you can redistribute it and/or
9 # modify it under the terms of the GNU General Public License as
10 # published by the Free Software Foundation; version 2.
12 # This program is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 # General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program; if not, write to the Free Software
19 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
21 # -------------------------------------------------------------------
27 SQL::Translator::XMI::Parser - XMI Parser class for use in SQL Fairy's XMI
34 use vars qw/$VERSION/;
35 $VERSION = sprintf "%d.%02d", q$Revision: 1.6 $ =~ /(\d+)\.(\d+)/;
39 use XML::XPath::XMLParser;
40 use Storable qw/dclone/;
44 # See SQL::Translator::XMI::Parser::V12 and SQL::Translator::XMI::Parser:V10
47 # Hash ref used to describe the 2 xmi formats 1.2 and 1.0. Neither is complete!
49 # NB The names of the data keys MUST be the same for both specs so the
50 # data structures returned are the same.
54 # * There is currently no way to set the data key name for attrib_data, it just
55 # uses the attribute name from the XMI. This isn't a problem at the moment as
56 # xmi1.0 names all these things with tags so we don't need the attrib data!
57 # Also use of names seems to be consistant between the versions.
62 # Call as class method to set up the parser from a spec (see above). This
63 # generates the get_ methods for the version of XMI the spec is for. Called by
64 # the sub-classes (e.g. V12 and V10) to create parsers for each version.
72 # Build lookups etc. Its important that each spec item becomes self contained
73 # so we can build good closures, therefore we do all the lookups 1st.
77 foreach my $spec ( values %$specs ) {
78 # Look up for kids get method
79 foreach ( @{$spec->{kids}} ) {
80 $_->{get_method} = "get_".$specs->{$_->{class}}{plural};
83 # Add xmi.id ti all specs. Everything we want at the moment (in both
84 # versions) has an id. The tags that don't seem to be used for
86 my $attrib_data = $spec->{attrib_data} ||= [];
87 push @$attrib_data, "xmi.id";
92 # Create get methods from spec
95 my ($proto,$specs) = @_;
96 my $class = ref($proto) || $proto;
97 foreach ( values %$specs ) {
98 # Clone from specs and sort out the lookups into it so we get a
99 # self contained spec to use as a proper closure.
100 my $spec = dclone($_);
102 # Create _get_* method with get_* as an alias unless the user has
103 # defined it. Allows for override. Note the alias is in this package
104 # so we can add overrides to both specs.
106 my $meth = "_get_$spec->{plural}";
107 *{$meth} = _mk_get($spec);
108 *{__PACKAGE__."::get_$spec->{plural}"} = sub {shift->$meth(@_);}
109 unless $class->can("get_$spec->{plural}");
114 # Sets up the XML::XPath object and then checks the version of the XMI file and
115 # blesses its self into either the V10 or V12 class.
119 my $class = ref($proto) || $proto;
123 # Create the XML::XPath object
124 # TODO Docs recommend we only use 1 XPath object per application
126 foreach (qw/filename xml ioref/) {
128 $xp = XML::XPath->new( $_ => $args{$_});
129 $xp->set_namespace("UML", "org.omg.xmi.namespace.UML");
133 $me = { xml_xpath => $xp };
135 # Work out the version of XMI we have and return as that sub class
136 my $xmiv = $args{xmi_version}
137 || "".$xp->findvalue('/XMI/@xmi.version')
138 || die "Can't find XMI version";
140 $class = __PACKAGE__."::V$xmiv";
142 die "Failed to load version sub class $class : $@" if $@;
144 return bless $me, $class;
150 # Generates and returns a get_ sub for the spec given.
151 # So, if you want to change how the get methods (e.g. get_classes) work do it
154 # The get methods made have the args described in the docs and 2 private args
155 # used internally, to call other get methods from paths in the spec.
156 # NB: DO NOT use publicly as you will break the version independance. e.g. When
157 # using _xpath you need to know which version of XMI to use. This is handled by
158 # the use of different paths in the specs.
160 # _context => The context node to use, if not given starts from root.
162 # _xpath => The xpath to use for finding stuff.
167 # get_* closure using $spec
169 my ($me, %args) = @_;
170 my $xp = delete $args{_context} || $me->{xml_xpath};
173 my $xpath = $args{_xpath} ||= $spec->{default_path};
174 #warn "Searching for $spec->{plural} using:$xpath\n";
176 my @nodes = $xp->findnodes($xpath);
177 #warn "None.\n" unless @nodes;
178 return unless @nodes;
180 for my $node (@nodes) {
181 #warn " Found $spec->{name} xmi.id=".$node->getAttribute("xmi.id")." name=".$node->getAttribute("name")."\n";
183 # my $thing = { xpNode => $node };
185 # Have we seen this before? If so just use the ref we have.
186 if ( my $id = $node->getAttribute("xmi.id") ) {
187 if ( my $foo = $me->{model}{things}{$id} ) {
188 #warn " Reffing from model **********************\n";
194 # Get the Tag attributes
195 foreach ( @{$spec->{attrib_data}} ) {
196 $thing->{$_} = $node->getAttribute($_);
200 foreach ( @{$spec->{path_data}} ) {
201 #warn " $spec->{name} - $_->{name} using:$_->{path}\n";
202 my @nodes = $node->findnodes($_->{path});
203 $thing->{$_->{name}} = @nodes ? $nodes[0]->getData
204 : (exists $_->{default} ? $_->{default} : undef);
207 # Run any filters set
209 # Should we do this after the kids as we may want to test them?
210 # e.g. test for number of attribs
211 if ( my $filter = $args{filter} ) {
213 next unless $filter->($thing);
216 # Add anything with an id to the things lookup
217 push @$things, $thing;
218 if ( exists $thing->{"xmi.id"} and defined $thing->{"xmi.id"}
219 and my $id = $thing->{"xmi.id"}
221 $me->{model}{things}{$id} = $thing; }
225 foreach ( @{$spec->{kids}} ) {
227 my $meth = $_->{get_method};
228 my $path = $_->{path};
230 # Variable subs on the path from thing
231 $path =~ s/\$\{(.*?)\}/$thing->{$1}/g;
232 $data = $me->$meth( _context => $node, _xpath => $path,
233 filter => $args{"filter_$_->{name}"} );
235 if ( $_->{multiplicity} eq "1" ) {
236 $thing->{$_->{name}} = shift @$data;
239 my $kids = $thing->{$_->{name}} = $data || [];
240 if ( my $key = $_->{"map"} ) {
241 $thing->{"_map_$_->{name}"} = _mk_map($kids,$key);
247 if ( $spec->{isRoot} ) {
248 push(@{$me->{model}{$spec->{plural}}}, $_) foreach @$things;
256 my ($kids,$key) = @_;
259 $map->{$_->{$key}} = $_ if exists $_->{$key};
264 sub get_associations {
265 my $assoc = shift->_get_associations(@_);
267 next unless defined $_->{ends}; # Wait until we get all of an association
268 my @ends = @{$_->{ends}};
270 warn "Sorry can't handle otherEnd associations with more than 2 ends";
273 $ends[0]{otherEnd} = $ends[1];
274 $ends[1]{otherEnd} = $ends[0];
279 1; #===========================================================================
282 package XML::XPath::Function;
285 # May need to look at doing deref on all paths just to be on the safe side!
287 # Will also want some caching as these calls are expensive as the whole doc
288 # is used but the same ref will likley be requested lots of times.
292 my ($node, @params) = @_;
294 die "xmiDeref() function takes one or no parameters\n";
297 my $nodeset = shift(@params);
298 return $nodeset unless $nodeset->size;
299 $node = $nodeset->get_node(1);
301 die "xmiDeref() needs an Element node."
302 unless $node->isa("XML::XPath::Node::Element");
304 my $id = $node->getAttribute("xmi.idref") or return $node;
305 return $node->getRootNode->find('//*[@xmi.id="'.$id.'"]');
316 use SQL::Translator::XMI::Parser;
317 my $xmip = SQL::Translator::XMI::Parser->new( xml => $xml );
318 my $classes = $xmip->get_classes();
322 Parses XMI files (XML version of UML diagrams) to perl data structures and
323 provides hooks to filter the data down to what you want.
327 Pass in name/value arg of either C<filename>, C<xml> or C<ioref> for the XMI
328 data you want to parse.
330 The version of XMI to use either 1.0 or 1.2 is worked out from the file. You
331 can also use a C<xmi_version> arg to set it explicitley.
335 Doc below is for classes method, all the other calls follow this form.
337 =head2 get_classes( ARGS )
339 ARGS - Name/Value list of args.
341 filter => A sub to filter the node to see if we want it. Has the nodes data,
342 before kids are added, referenced to $_. Should return true if you
343 want it, false otherwise.
345 e.g. To find only classes with a "Foo" stereotype.
347 filter => sub { return $_->{stereotype} eq "Foo"; }
349 filter_attributes => A filter sub to pass onto get_attributes.
351 filter_operations => A filter sub to pass onto get_operations.
353 Returns a perl data structure including all the kids. e.g.
357 'visibility' => 'public',
358 'isActive' => 'false',
359 'isAbstract' => 'false',
360 'isSpecification' => 'false',
361 'stereotype' => 'Table',
367 'stereotype' => 'PK',
369 'ownerScope' => 'instance',
370 'visibility' => 'public',
371 'initialValue' => undef,
372 'isSpecification' => 'false',
377 'datatype' => 'varchar'
378 'ownerScope' => 'instance',
379 'visibility' => 'public',
380 'initialValue' => '',
381 'isSpecification' => 'false',
387 'isQuery' => 'false',
388 'ownerScope' => 'instance',
389 'visibility' => 'public',
390 'isSpecification' => 'false',
392 'isAbstract' => 'false',
395 'concurrency' => 'sequential'
399 'isSpecification' => 'false',
406 'isSpecification' => 'false',
413 'isSpecification' => 'false',
423 =head1 XMI XPath Functions
425 The Parser adds the following extra XPath functions for use in the Specs.
429 Deals with xmi.id/xmi.idref pairs of attributes. You give it an
430 xPath e.g 'UML:ModelElement.stereotype/UML:stereotype' if the the
431 tag it points at has an xmi.idref it looks up the tag with that
432 xmi.id and returns it.
434 If it doesn't have an xmi.id, the path is returned as normal.
438 <UML:ModelElement.stereotype>
439 <UML:Stereotype xmi.idref = 'stTable'/>
440 </UML:ModelElement.stereotype>
442 <UML:Stereotype xmi.id='stTable' name='Table' visibility='public'
443 isAbstract='false' isSpecification='false' isRoot='false' isLeaf='false'>
444 <UML:Stereotype.baseClass>Class</UML:Stereotype.baseClass>
447 Using xmideref(//UML:ModelElement.stereotype/UML:stereotype) would return the
448 <UML:Stereotype xmi.id = '3b4b1e:f762a35f6b:-7fb6' ...> tag.
450 Using xmideref(//UML:ModelElement.stereotype/UML:stereotype)/@name would give
461 =head1 VERSION HISTORY
465 grommit <mark.addison@itn.co.uk>