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#!/usr/bin/perl -w # -*- mode: perl -*-
# GIFT, a flexible content based image retrieval system.
# Copyright (C) 1998, 1999, 2000, 2001, 2002, CUI University of Geneva
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#############################################################
#
# CXMLTreeVisitor
#
# this visitor class is intended as parameter to
# CGIFTLink::traverseTree
# CGIFTLink::traverseTree will call the startVisit function of
# this class.
#
# YOU SHOULD NOT NEED TO TOUCH THIS CLASS
# THERE IS AN ERROR
#
# SUBCLASS THIS CLASS TO OBTAIN WHAT YOU WANT
#
package CXMLTreeVisitor;
require Exporter;
@ISA= qw(Exporter);
@EXPORT_OK= qw(new
startVisit
endVisit
);
sub new(){
my $class = shift;
my $self = {};
bless $self, $class;
$self->initialize();
return $self;
}
sub initialize(){
my$self=shift;
}
#########################################
#
# startVisit
#
# this startVisit function is intended as example, and prints the node
# it gets as a parameter.
#
# PARAMETERS: The startVisit function takes a tree node (i.e. a hash reference)
# as parameter. The parameter is provided by CGIFTLink::traverse
#
# RETURNS: nothing
#
sub startVisit( $ ){
my $self=shift;
my $lRoot=shift;
if(defined($lRoot->{element})){
print "<Node: ",$lRoot->{element}, "\n";
my $i;
for $i (keys(%{$lRoot->{attributes}})){
print " ",$i,"=\"",$lRoot->{attributes}->{$i},"\"\n";
}
print ">\n";
}else{
print "TEXT NODE:{",$lRoot->{text},"}\n\n";
}
}
#########################################
#
# endVisit
#
# this endVisit function does plain nothing
#
# PARAMETERS: The endVisit function takes a tree node (i.e. a hash reference)
# as parameter. The parameter is provided by CGIFTLink::traverse
#
# RETURNS: nothing
#
sub endVisit( $ ){
my $self=shift;
my $lRoot=shift;
if(defined($lRoot->{element})){
print "</Node: ",$lRoot->{element}, ">\n";
}
}
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