NAME

       XML::Filter::DocSplitter - Multipass processing of documents

VERSION

       version 0.46

SYNOPSIS

           ## See XML::SAX::???? for an easier way to use this filter.

           use XML::SAX::Machines qw( Machine ) ;

           my $m = Machine(
               [ Intake => "XML::Filter::DocSplitter" => qw( Filter ) ],
               [ Filter => "My::Filter"               => qw( Merger ) ],
               [ Merger => "XML::Filter::Merger" => qw( Output ) ],
               [ Output => \*STDOUT ],
           );

           ## Let the distributor coordinate with the merger
           ## XML::SAX::Manifold does this for you.
           $m->Intake->set_aggregator( $m->Merger );

           $m->parse_file( "foo" );

DESCRIPTION

       XML::Filter::DocSplitter is a SAX filter that allows you to apply a filter to repeated
       sections of a document.  It splits a document up at a predefined elements in to multiple
       documents and the filter is run on each document.  The result can be left as a stream of
       separate documents or combined back in to a single document using a filter like
       XML::SAX::Merger.

       By default, the input document is split in all children of the root element.  By that
       reckoning, this document has three sub-documents in it:

           <doc>
               <subdoc> .... </subdoc>
               <subdoc> .... </subdoc>
               <subdoc> .... </subdoc>
           </doc>

       When using without an aggregator, all events up to the first record are lost; with an
       aggregator, they are passed directly in to the aggregator as the "first" document.  All
       elements between the records (the "\n    " text nodes, in this case) are also passed
       directly to the merger (these will arrive between the end_document and start_document
       calls for each of the records), as are all events from the last record until the end of
       the input document.  This means that the first document, as seen by the merger, is
       incomplete; it's missing it's end_element, which is passed later.

       The approach of passing events from the input document right on through to the merger
       differs from the way XML::Filter::Distributor works.

       This class is derived from XML::SAX::Base, see that for details.

NAME

       XML::Filter::DocSplitter - Multipass processing of documents

METHODS

       new
               my $d = XML::Filter::DocSplitter->new(
                   Handler    => $h,
                   Aggregator => $a,    ## optional
               );

       set_aggregator
               $h->set_aggregator( $a );

           Sets the SAX filter that will stitch the resulting subdocuments back together.  Set to
           "undef" to prevent such stitchery.

           The aggregator should support the "start_manifold_document", "end_manifold_document",
           and "set_include_all_roots" methods as described in XML::Filter::Merger.

       get_aggregator
               my $a = $h->get_aggregator;

           Gets the SAX filter that will stitch the resulting subdocuments back together.

       set_split_path
               $h->set_split_path( "/a/b/c" );

           Sets the pattern to use when splitting the document.  Patterns are a tiny little
           subset of the XPath language:

               Pattern     Description
               =======     ===========
               /*/*        splits the document on children of the root elt (default)
               //record    splits each <record> elt in to a document
               /*/record   splits each <record> child of the root elt
               /a/b/c/d    splits each of the <d> elts in to a document

       get_split_path
               my $a = $h->get_split_path;

LIMITATIONS

       Can only feed a single aggregator at the moment :).  I can fix this with a bit of effort.

AUTHOR

           Barrie Slaymaker <barries@slaysys.com>

COPYRIGHT

           Copyright 2000, Barrie Slaymaker, All Rights Reserved.

       You may use this module under the terms of the Artistic, GPL, or the BSD licenses.

AUTHORS

       •   Barry Slaymaker

       •   Chris Prather <chris@prather.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2013 by Barry Slaymaker.

       This is free software; you can redistribute it and/or modify it under the same terms as
       the Perl 5 programming language system itself.