Peter de Vos > BPM-Engine > BPM::Engine::Util::XPDL

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Module Version: 0.01   Source  

NAME ^

BPM::Engine::Util::XPDL - XPDL parsing helper functions

VERSION ^

0.01

SYNOPSIS ^

    use BPM::Engine::Util::XPDL ':all';
    
    $data = xpdl_hash($input);

    say $data->{WorkflowProcesses}->[0]->{Id};

DESCRIPTION ^

This module provides helper functions for parsing of XPDL files and strings.

Parameter INPUT

The first parameter to any function should be the XML message to be translated into a Perl structure. Choose one of the following:

A filename or URL

If the filename contains no directory components, the function will look for the file in the current directory.

  $ref = xpdl_hash('/etc/params.xml');

Note, the filename - (dash) can be used to parse from STDIN.

A scalar reference to an XML string

A string containing XML will be parsed directly.

  my $string = '<Some>Thing</Some>';
  $doc = xml_doc(\$string);
An IO::Handle object

An IO::Handle object will be read to EOF and its contents parsed. eg:

  $fh  = IO::File->new('./xpdl/workflows.xpdl');
  $doc = xml_doc($fh);

EXPORTS ^

None of the functions are exported by default. The :all key exports all functions.

xpdl_hash

    my $data = xpdl_hash($input);
    say $data->{WorkflowProcesses}->[0]->{Id};

The result of xpdl_doc() parsed into a hash by BPM::XPDL. The resulting data hash represents the XPDL document.

This is presumably the only function you'll need from this module.

xml_hash

    my $data = xml_hash($input);
    say $data->{WorkflowProcesses}->[0]->{Id};

A 'lightweight' parsing of XPDL-like XML strings. Useful for testing. Example:

    my $string = qq!
    <Package>
    <WorkflowProcesses>
        <WorkflowProcess Id="OrderPizza" Name="Order Pizza">
            <Activities>
                <Activity Id="PlaceOrder" />
                <Activity Id="WaitForDelivery" />
                <Activity Id="PayPizzaGuy" />
            </Activities>
            <Transitions>
                <Transition Id="1" From="PlaceOrder" To="WaitForDelivery"/>
                <Transition Id="2" From="WaitForDelivery" To="PayPizzaGuy"/>
            </Transitions>
        </WorkflowProcess>
    </WorkflowProcesses>
    </Package>!;

    my $data = xml_hash($string);
    
    say $data->{WorkflowProcesses}->[0]->{Id}; # prints 'OrderPizza'

This function will possibly be deprecated in the near future.

xml_doc

    $doc = xml_doc($input);

Parses the given file (or URL), string, or input stream into a DOM tree.

Returns a XML::LibXML::Document object.

xpdl_doc

Parses the given file (or URL), string, or input stream (by calling xml_doc()) and does some checks on the document, specifically:

Returns a XML::LibXML::Document object.

DEPENDENCIES ^

AUTHOR ^

Peter de Vos <sitetech@cpan.org>

COPYRIGHT AND LICENSE ^

Copyright (c) 2010, 2011 Peter de Vos <sitetech@cpan.org>.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

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