source: gsdl/trunk/perllib/plugins/ImagePlugin.pm@ 17196

###########################################################################
#
# ImagePlugin.pm -- for processing standalone images
# A component of the Greenstone digital library software
# from the New Zealand Digital Library Project at the 
# University of Waikato, New Zealand.
#
# Copyright (C) 1999 New Zealand Digital Library Project
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#
###########################################################################

package ImagePlugin;

use BasePlugin;
use ImageConverter;

use strict;
no strict 'refs'; # allow filehandles to be variables and viceversa
no strict 'subs';

use gsprintf 'gsprintf';

sub BEGIN {
    @ImagePlugin::ISA = ('BasePlugin', 'ImageConverter');
}

my $arguments =
    [ { 'name' => "process_exp",
    'desc' => "{BasePlugin.process_exp}",
    'type' => "regexp",
    'deft' => &get_default_process_exp(),
    'reqd' => "no" },
      ];

my $options = { 'name'     => "ImagePlugin",
        'desc'     => "{ImagePlugin.desc}",
        'abstract' => "no",
        'inherits' => "yes",
        'args'     => $arguments };



sub new {
    my ($class) = shift (@_);
    my ($pluginlist,$inputargs,$hashArgOptLists) = @_;
    push(@$pluginlist, $class);

    push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});
    push(@{$hashArgOptLists->{"OptList"}},$options);

    new ImageConverter($pluginlist, $inputargs, $hashArgOptLists);
    my $self = new BasePlugin($pluginlist, $inputargs, $hashArgOptLists);

    return bless $self, $class;
}

sub init {
    my $self = shift (@_);
    my ($verbosity, $outhandle, $failhandle) = @_;

    $self->SUPER::init(@_);
    $self->ImageConverter::init();
    $self->{'cover_image'} = 0; # makes no sense for images
}

sub begin {
    my $self = shift (@_);
    my ($pluginfo, $base_dir, $processor, $maxdocs) = @_;

    $self->SUPER::begin(@_);
    $self->ImageConverter::begin();
}

sub get_default_process_exp {
    my $self = shift (@_);

    return q^(?i)(\.jpe?g|\.gif|\.png|\.bmp|\.xbm|\.tif?f)$^; 
}

# this makes no sense for images
sub block_cover_image
{
    my $self =shift (@_);
    my ($filename) = @_;

    return;
}

# do plugin specific processing of doc_obj
sub process {
    my $self = shift (@_);
    # options??
    my ($pluginfo, $base_dir, $file, $metadata, $doc_obj, $gli) = @_;


    my $outhandle = $self->{'outhandle'};
    my ($filename_full_path, $filename_no_path) = &util::get_full_filenames($base_dir, $file);

    if ($self->{'image_conversion_available'} == 1) {
    my $utf8_filename_no_path = $self->filepath_to_utf8($filename_no_path);
    my $url_encoded_filename = &unicode::url_encode($utf8_filename_no_path);
    $self->generate_images($filename_full_path, $url_encoded_filename, $doc_obj, $doc_obj->get_top_section()); # should we check the return value?
    } else {
    if ($gli) {
        &gsprintf(STDERR, "<Warning p='ImagePlugin' r='{ImageConverter.noconversionavailable}: {ImageConverter.".$self->{'no_image_conversion_reason'}."}'>");
    }
    }
    #we have no text - adds dummy text and NoText metadata
    $self->add_dummy_text($doc_obj, $doc_obj->get_top_section());

    return 1;

}

sub clean_up_after_doc_obj_processing {
    my $self = shift(@_);
    
    $self->ImageConverter::clean_up_temporary_files();
}

1;