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package HTTP::OAI::SAX::Driver;
use XML::LibXML;
use base XML::SAX::Base;
use XML::NamespaceSupport;
use strict;
=pod
=head1 NAME
HTTP::OAI::SAXHandler - SAX2 utility filter
=head1 DESCRIPTION
This module provides utility methods for SAX2, including collapsing multiple "characters" events into a single event.
This module exports methods for generating SAX2 events with Namespace support. This *isn't* a fully-fledged SAX2 generator!
=over 4
=item $h = HTTP::OAI::SAXHandler->new()
Class constructor.
=cut
sub new
{
my( $class, %self ) = @_;
$self{ns} = XML::NamespaceSupport->new;
my $self = $class->SUPER::new( %self );
return $self;
}
sub generate
{
my( $self, $node ) = @_;
my $nodeType = $node->nodeType;
if( $nodeType == XML_DOCUMENT_NODE )
{
$self->generate( $node->documentElement );
}
elsif( $nodeType == XML_DOCUMENT_FRAG_NODE )
{
$self->generate( $_ ) for $node->childNodes;
}
elsif( $nodeType == XML_ELEMENT_NODE )
{
$self->start_element( $node->nodeName, map {
$_->nodeName => $_->nodeValue
} $node->attributes
);
$self->generate( $_ ) for $node->childNodes;
$self->end_element( $node->nodeName );
}
elsif( $nodeType == XML_TEXT_NODE )
{
$self->characters( { Data => $node->nodeValue } );
}
}
sub start_oai_pmh
{
my( $self ) = @_;
$self->start_document;
$self->xml_decl({'Version'=>'1.0','Encoding'=>'UTF-8'});
$self->characters({'Data'=>"\n"});
$self->start_prefix_mapping({
Prefix => "",
NamespaceURI => HTTP::OAI::OAI_NS(),
});
$self->start_prefix_mapping({
Prefix => "xsi",
NamespaceURI => "http://www.w3.org/2001/XMLSchema-instance",
});
}
sub end_oai_pmh
{
my( $self ) = @_;
$self->end_prefix_mapping({
Prefix => "",
NamespaceURI => HTTP::OAI::OAI_NS(),
});
$self->end_prefix_mapping({
Prefix => "xsi",
NamespaceURI => "http://www.w3.org/2001/XMLSchema-instance",
});
$self->end_document;
}
sub data_element {
my( $self, $Name, $value, @attr ) = @_;
$self->start_element( $Name, @attr );
$self->characters( {Data => $value} );
$self->end_element( $Name );
}
sub start_prefix_mapping
{
my( $self, $hash ) = @_;
$self->{ns}->declare_prefix( $hash->{Prefix}, $hash->{NamespaceURI} );
$self->SUPER::start_prefix_mapping( $hash );
}
sub start_element
{
my( $self, $Name, @attr ) = @_;
$self->{ns}->push_context;
my %attr;
while(my( $key, $value ) = splice(@attr,0,2))
{
next if !defined $value;
my( $NamespaceURI, $Prefix, $LocalName );
if( $key =~ /^xmlns:(.+)$/ )
{
$self->start_prefix_mapping( {Prefix => $1, NamespaceURI => $value} );
$NamespaceURI = "http://www.w3.org/2000/xmlns/";
$Prefix = "xmlns";
$LocalName = $1;
}
elsif( $key eq "xmlns" )
{
$self->start_prefix_mapping( {Prefix => '', NamespaceURI => $value} );
$NamespaceURI = '';
$Prefix = '';
$LocalName = $key;
}
elsif( $key =~ /^(.+):(.+)$/ )
{
$NamespaceURI = $self->{ns}->get_uri( $1 );
$Prefix = $1;
$LocalName = $2;
}
else
{
$NamespaceURI = '';
$Prefix = '';
$LocalName = $key;
}
$attr{"{$NamespaceURI}$LocalName"} = {
NamespaceURI => $NamespaceURI,
Prefix => $Prefix,
LocalName => $LocalName,
Name => $key,
Value => $value,
};
}
my ($Prefix,$LocalName) = split /:/, $Name;
unless(defined($LocalName)) {
$LocalName = $Prefix;
$Prefix = '';
}
my $NamespaceURI = $self->{ns}->get_uri( $Prefix );
$self->SUPER::start_element({
'NamespaceURI'=>$NamespaceURI,
'Name'=>$Name,
'Prefix'=>$Prefix,
'LocalName'=>$LocalName,
'Attributes'=>\%attr
});
}
sub end_element
{
my( $self, $Name ) = @_;
my ($Prefix,$LocalName) = split /:/, $Name;
unless(defined($LocalName)) {
$LocalName = $Prefix;
$Prefix = '';
}
my $NamespaceURI = $self->{ns}->get_uri( $Prefix );
$self->SUPER::end_element({
'NamespaceURI'=>$NamespaceURI,
'Name'=>$Name,
'Prefix'=>$Prefix,
'LocalName'=>$LocalName,
});
$self->{ns}->pop_context;
}
1;
__END__
=back
=head1 AUTHOR
Tim Brody <tdb01r@ecs.soton.ac.uk>
|
