| 1 | ###########################################################################
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| 2 | #
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| 3 | # WebDownload.pm -- base class for all the import plugins
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| 4 | # A component of the Greenstone digital library software
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| 5 | # from the New Zealand Digital Library Project at the
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| 6 | # University of Waikato, New Zealand.
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| 7 | #
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| 8 | # Copyright (C) 1999 New Zealand Digital Library Project
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| 9 | #
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| 10 | # This program is free software; you can redistribute it and/or modify
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| 11 | # it under the terms of the GNU General Public License as published by
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| 12 | # the Free Software Foundation; either version 2 of the License, or
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| 13 | # (at your option) any later version.
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| 14 | #
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| 15 | # This program is distributed in the hope that it will be useful,
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| 16 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | # GNU General Public License for more details.
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| 19 | #
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| 20 | # You should have received a copy of the GNU General Public License
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| 21 | # along with this program; if not, write to the Free Software
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| 22 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 23 | #
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| 24 | ###########################################################################
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| 25 |
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| 26 | package OAIDownload;
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| 27 |
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| 28 | eval {require bytes};
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| 29 |
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| 30 | # suppress the annoying "subroutine redefined" warning that various
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| 31 | # plugins cause under perl 5.6
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| 32 | $SIG{__WARN__} = sub {warn($_[0]) unless ($_[0] =~ /Subroutine\s+\S+\sredefined/)};
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| 33 |
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| 34 | use strict;
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| 35 |
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| 36 | use WgetDownload;
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| 37 | use XMLParser;
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| 38 |
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| 39 | use POSIX qw(tmpnam);
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| 40 | use util;
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| 41 |
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| 42 | sub BEGIN {
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| 43 | @OAIDownload::ISA = ('WgetDownload');
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| 44 | }
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| 45 |
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| 46 | my $arguments =
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| 47 | [ { 'name' => "url",
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| 48 | 'disp' => "{OAIDownload.url_disp}",
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| 49 | 'desc' => "{OAIDownload.url}",
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| 50 | 'type' => "string",
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| 51 | 'reqd' => "yes"},
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| 52 | { 'name' => "metadata_prefix",
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| 53 | 'disp' => "{OAIDownload.metadata_prefix_disp}",
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| 54 | 'desc' => "{OAIDownload.metadata_prefix}",
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| 55 | 'type' => "string",
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| 56 | 'deft' => "oai_dc",
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| 57 | 'reqd' => "no"},
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| 58 | { 'name' => "set",
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| 59 | 'disp' => "{OAIDownload.set_disp}",
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| 60 | 'desc' => "{OAIDownload.set}",
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| 61 | 'type' => "string",
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| 62 | 'reqd' => "no"},
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| 63 | { 'name' => "get_doc",
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| 64 | 'disp' => "{OAIDownload.get_doc_disp}",
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| 65 | 'desc' => "{OAIDownload.get_doc}",
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| 66 | 'type' => "flag",
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| 67 | 'reqd' => "no"},
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| 68 | { 'name' => "max_records",
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| 69 | 'disp' => "{OAIDownload.max_records_disp}",
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| 70 | 'desc' => "{OAIDownload.max_records}",
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| 71 | 'type' => "int",
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| 72 | 'deft' => "500",
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| 73 | 'range' => "1,",
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| 74 | 'reqd' => "no"} ];
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| 75 |
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| 76 | my $options = { 'name' => "OAIDownload",
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| 77 | 'desc' => "{OAIDownload.desc}",
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| 78 | 'abstract' => "no",
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| 79 | 'inherits' => "yes",
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| 80 | 'args' => $arguments };
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| 81 |
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| 82 | my $self;
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| 83 |
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| 84 | my $strWgetOptions="";
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| 85 |
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| 86 | sub new
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| 87 | {
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| 88 | my ($class) = shift (@_);
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| 89 | my ($getlist,$inputargs,$hashArgOptLists) = @_;
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| 90 | push(@$getlist, $class);
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| 91 |
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| 92 | if(defined $arguments){ push(@{$hashArgOptLists->{"ArgList"}},@{$arguments});}
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| 93 | if(defined $options) { push(@{$hashArgOptLists->{"OptList"}},$options)};
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| 94 |
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| 95 | $self = (defined $hashArgOptLists)? new WgetDownload($getlist,$inputargs,$hashArgOptLists): new WgetDownload($getlist,$inputargs);
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| 96 |
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| 97 | if ($self->{'info_only'}) {
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| 98 | # don't worry about any options etc
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| 99 | return bless $self, $class;
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| 100 | }
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| 101 |
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| 102 | my $parser = new XML::Parser('Style' => 'Stream',
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| 103 | 'Handlers' => {'Char' => \&Char,
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| 104 | 'Start' => \&OAI_StartTag,
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| 105 | 'End' => \&OAI_EndTag
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| 106 | });
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| 107 | $self->{'parser'} = $parser;
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| 108 |
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| 109 | # make sure the tmp directory that we will use later exists
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| 110 | my $tmp_dir = "$ENV{GSDLHOME}/tmp";
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| 111 | if (! -e $tmp_dir) {
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| 112 | &util::mk_dir($tmp_dir);
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| 113 | }
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| 114 |
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| 115 | return bless $self, $class;
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| 116 | }
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| 117 |
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| 118 | sub download
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| 119 | {
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| 120 | my ($self) = shift (@_);
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| 121 | my ($hashGeneralOptions) = @_;
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| 122 |
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| 123 | print STDERR "here2";
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| 124 |
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| 125 | $strWgetOptions = $self->getWgetOptions();
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| 126 | my $cmdWget = $strWgetOptions;
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| 127 |
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| 128 | my $strOutputDir ="";
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| 129 | $strOutputDir = $hashGeneralOptions->{"cache_dir"};
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| 130 | my $strBasURL = $self->{'url'};
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| 131 | my $intMaxRecords = $self->{'max_records'};
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| 132 | my $blnDownloadDoc = $self->{'get_doc'};
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| 133 |
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| 134 | print STDERR "<<Defined Maximum>>\n";
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| 135 |
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| 136 | my $strIDs = $self->getOAIIDs($strBasURL);
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| 137 |
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| 138 | if($strIDs eq "")
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| 139 | {
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| 140 | print STDERR "Error: No ID being found\n";
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| 141 | return 0;
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| 142 | }
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| 143 | my $aryIDs = $self->parseOAIIDs($strIDs);
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| 144 | my $intIDs = 0;
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| 145 | if($self->{'max_records'} < scalar(@$aryIDs))
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| 146 | {
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| 147 | $intIDs = $self->{'max_records'};
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| 148 | }
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| 149 | else
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| 150 | {
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| 151 | $intIDs = scalar(@$aryIDs);
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| 152 | }
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| 153 | print STDERR "<<Total number of record(s):$intIDs>>\n";
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| 154 |
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| 155 | $self->getOAIRecords($aryIDs, $strOutputDir, $strBasURL, $intMaxRecords, $blnDownloadDoc);
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| 156 |
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| 157 | my $tmp_file = "$ENV{GSDLHOME}/tmp/oai.tmp";
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| 158 | &util::rm($tmp_file);
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| 159 |
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| 160 | return 1;
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| 161 | }
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| 162 |
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| 163 | sub getOAIIDs
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| 164 | {
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| 165 | my ($self,$strBasURL) = @_;
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| 166 | my ($cmdWget);
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| 167 |
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| 168 | my $wgetOptions = $self->getWgetOptions();
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| 169 |
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| 170 | $cmdWget = $wgetOptions;
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| 171 |
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| 172 | print STDERR "Gathering OAI identifiers.....\n";
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| 173 |
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| 174 | my $metadata_prefix = $self->{'metadata_prefix'};
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| 175 | $cmdWget .= " -q -O - \"$strBasURL?verb=ListIdentifiers&metadataPrefix=$metadata_prefix";
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| 176 |
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| 177 |
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| 178 | # if $set specified, add it in to URL
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| 179 | my $set = $self->{'set'};
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| 180 | $cmdWget .= "&set=$set" if ($set ne "");
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| 181 |
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| 182 | $cmdWget .= "\" ";
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| 183 |
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| 184 |
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| 185 | my $strIDs = $self->useWget($cmdWget);
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| 186 |
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| 187 | if (!defined $strIDs or $strIDs eq "" ){
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| 188 | print STDERR "Server information is unavailable.\n";
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| 189 | print STDERR "<<Finished>>\n";
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| 190 | return;
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| 191 | }
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| 192 |
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| 193 | print STDERR "<<Download Information>>\n";
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| 194 |
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| 195 | $self->parse_xml($strIDs);
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| 196 |
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| 197 | return $strIDs;
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| 198 | }
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| 199 |
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| 200 | sub parseOAIIDs
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| 201 | {
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| 202 | my ($self,$strIDs) = @_;
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| 203 |
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| 204 | print STDERR "Parsing OAI identifiers.....\n";
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| 205 | $strIDs =~ s/^.*?<identifier>/<identifier>/s;
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| 206 | $strIDs =~ s/^(.*<\/identifier>).*$/$1/s;
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| 207 |
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| 208 | my @aryIDs = ();
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| 209 |
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| 210 | while ($strIDs =~ m/<identifier>(.*?)<\/identifier>(.*)$/s)
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| 211 | {
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| 212 | $strIDs = $2;
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| 213 | push(@aryIDs,$1);
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| 214 | }
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| 215 |
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| 216 | return \@aryIDs;
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| 217 | }
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| 218 |
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| 219 | sub dirFileSplit
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| 220 | {
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| 221 | my ($self,$strFile) = @_;
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| 222 |
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| 223 | my @aryDirs = split("[/\]",$strFile);
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| 224 |
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| 225 | my $strLocalFile = pop(@aryDirs);
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| 226 | my $strSubDirs = join("/",@aryDirs);
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| 227 |
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| 228 | return ($strSubDirs,$strLocalFile);
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| 229 | }
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| 230 |
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| 231 | sub getOAIDoc
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| 232 | {
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| 233 | my ($self,$strRecord, $strSubDirPath) = @_;
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| 234 |
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| 235 | print STDERR "Gathering source documents.....\n";
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| 236 | # look out for identifier tag in metadata section
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| 237 |
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| 238 | if ($strRecord =~ m/<metadata>(.*)<\/metadata>/s)
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| 239 | {
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| 240 | my $strMetaTag = $1;
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| 241 |
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| 242 | if ($strMetaTag =~ m/<(dc:)?identifier>(.*?)<\/(dc:)?identifier>/s)
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| 243 | {
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| 244 | my $strDocURL = $2;
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| 245 |
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| 246 | my ($unused,$strDocFile) = $self->dirFileSplit($strDocURL);
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| 247 |
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| 248 | my $strSoureDirPath ="";
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| 249 |
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| 250 | $strSoureDirPath = &util::filename_cat($strSubDirPath,"srcdocs");
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| 251 |
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| 252 | &util::mk_dir($strSoureDirPath) if (!-e "$strSoureDirPath");
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| 253 |
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| 254 | my $strFullDocFilePath = &util::filename_cat($strSoureDirPath,$strDocFile);
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| 255 |
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| 256 | my $wget_cmd = $strWgetOptions." -q -O \"$strFullDocFilePath\" \"$strDocURL\"";
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| 257 |
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| 258 | my $strResponse = $self->useWget($wget_cmd,1);
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| 259 |
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| 260 | if($strResponse ne "")
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| 261 | {
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| 262 | print STDERR "Error occured while retriving OAI souce documents: $strResponse\n";
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| 263 | exit(-1);
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| 264 | }
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| 265 |
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| 266 | $strRecord =~ s/<metadata>(.*?)<(dc:)?identifier>$strDocURL<\/(dc:)?identifier>(.*?)<\/metadata>/<metadata>$1<OrigURL>$strDocURL<\/OrigURL>\n <identifier>srcdocs\/$strDocFile<\/identifier>$4<\/metadata>/s;
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| 267 | }
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| 268 | else
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| 269 | {
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| 270 | print STDERR "\tNo souce document URL is specified in the OAI record (No (dc:)?identifier is provided)\n";
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| 271 | }
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| 272 | }
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| 273 | else
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| 274 | {
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| 275 | print STDERR "\tNo souce document URL is specified in the OAI record (No metadata field is provided)\n";
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| 276 | }
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| 277 |
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| 278 | }
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| 279 |
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| 280 | sub getOAIRecords
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| 281 | {
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| 282 | my ($self,$aryIDs, $strOutputDir, $strBasURL, $intMaxRecords, $blnDownloadDoc) = @_;
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| 283 |
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| 284 | my $intDocCounter = 0;
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| 285 |
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| 286 | my $metadata_prefix = $self->{'metadata_prefix'};
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| 287 |
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| 288 | foreach my $strID ( @$aryIDs)
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| 289 | {
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| 290 | print STDERR "Gathering OAI record with ID:$strID.....\n";
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| 291 |
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| 292 | my $cmdWget= $strWgetOptions." -q -O - \"$strBasURL?verb=GetRecord&metadataPrefix=$metadata_prefix&identifier=$strID\"";
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| 293 |
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| 294 | my $strRecord = $self->useWget($cmdWget);
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| 295 |
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| 296 |
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| 297 | my @fileDirs = split(":",$strID);
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| 298 |
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| 299 | # setup directories
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| 300 |
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| 301 | $strOutputDir =~ s/"//g; #"
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| 302 |
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| 303 | my $host =$self->{'url'};
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| 304 |
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| 305 | $host =~ s/http:\/\///g;
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| 306 |
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| 307 | $host =~ s/:.*//g;
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| 308 |
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| 309 | my $midDir = join ("/",@fileDirs);
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| 310 | my $strFileURL = "$strOutputDir/$host/".$midDir.".oai";
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| 311 |
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| 312 | # prepare subdirectory for record (if needed)
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| 313 | my ($strSubDirPath,$unused) = ("", "");
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| 314 |
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| 315 | ($strSubDirPath,$unused) = $self->dirFileSplit($strFileURL);
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| 316 |
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| 317 | &util::mk_all_dir($strSubDirPath);
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| 318 |
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| 319 | my $ds = &util::get_dirsep();
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| 320 |
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| 321 | if($blnDownloadDoc)
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| 322 | {
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| 323 | $self->getOAIDoc($strRecord,$strSubDirPath);
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| 324 | }
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| 325 |
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| 326 | # save record
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| 327 | open (OAIOUT,">$strFileURL")
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| 328 | || die "Unable to save oai metadata record: $!\n";
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| 329 | print OAIOUT $strRecord;
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| 330 | close(OAIOUT);
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| 331 |
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| 332 | print STDERR "Saving records to $strFileURL\n";
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| 333 | print STDERR "<<Done>>\n";
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| 334 | $intDocCounter ++;
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| 335 | last if ($intDocCounter >= $intMaxRecords);
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| 336 | }
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| 337 |
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| 338 | ($intDocCounter >= $intMaxRecords) ?
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| 339 | print STDERR "Reached maximum download records, use -max_records to set the maximum.\n":
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| 340 | print STDERR "Complete download meta record from $strBasURL\n";
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| 341 |
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| 342 | print STDERR "<<Finished>>\n";
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| 343 | }
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| 344 |
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| 345 | sub url_information
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| 346 | {
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| 347 | my ($self) = shift (@_);
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| 348 | if(!defined $self){ die "System Error: No \$self defined for url_information in OAIDownload\n";}
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| 349 |
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| 350 | my $wgetOptions = $self->getWgetOptions();
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| 351 | my $strBaseCMD = $wgetOptions." -q -O - \"$self->{'url'}?_OPTS_\"";
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| 352 |
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| 353 | my $strIdentify = "verb=Identify";
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| 354 | my $strListSets = "verb=ListSets";
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| 355 |
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| 356 | my $strIdentifyCMD = $strBaseCMD;
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| 357 | $strIdentifyCMD =~ s/_OPTS_/$strIdentify/;
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| 358 |
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| 359 | my $strIdentifyText = $self->useWget($strIdentifyCMD);
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| 360 |
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| 361 | if (!defined $strIdentifyText or $strIdentifyText eq "" ){
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| 362 | print STDERR "Server information is unavailable.\n";
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| 363 | print STDERR "<<Finished>>\n";
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| 364 | return;
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| 365 | }
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| 366 |
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| 367 | print STDERR "General information:\n";
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| 368 | $self->parse_xml($strIdentifyText);
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| 369 |
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| 370 | my $strListSetCMD = $strBaseCMD;
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| 371 | $strListSetCMD =~ s/_OPTS_/$strListSets/;
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| 372 | my $strListSetsText = $self->useWget($strListSetCMD);
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| 373 |
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| 374 |
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| 375 | print STDERR "List Information:\n";
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| 376 | $self->parse_xml($strListSetsText);
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| 377 | }
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| 378 |
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| 379 | sub parse_xml
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| 380 | {
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| 381 | my ($self) = shift (@_);
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| 382 | my ($strOutputText) = @_;
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| 383 |
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| 384 | #Open a temporary file to store OAI information, and store the information to the temp file
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| 385 | my $name = "$ENV{GSDLHOME}/tmp/oai.tmp";
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| 386 |
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| 387 | open(*OAIOUT,"> $name");
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| 388 |
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| 389 | print OAIOUT $strOutputText;
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| 390 | close(OAIOUT);
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| 391 |
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| 392 | $self->{'temp_file_name'} = $name;
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| 393 |
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| 394 | eval {
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| 395 | $self->{'parser'}->parsefile("$name");
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| 396 | };
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| 397 |
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| 398 | if ($@) {
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| 399 | die "OAI: $name is not a well formed XML file ($@)\n";
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| 400 | }
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| 401 | }
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| 402 |
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| 403 | END{
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| 404 | if($self->{'info'})
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| 405 | {
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| 406 | unlink($self->{'temp_file_name'}) or die "Could not unlink $self->{'temp_file_name'}: $!";
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| 407 | }
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| 408 | }
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| 409 |
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| 410 | # This Char function overrides the one in XML::Parser::Stream to overcome a
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| 411 | # problem where $expat->{Text} is treated as the return value, slowing
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| 412 | # things down significantly in some cases.
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| 413 | sub Char {
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| 414 | use bytes; # Necessary to prevent encoding issues with XML::Parser 2.31+
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| 415 | $_[0]->{'Text'} .= $_[1];
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| 416 | if ((defined $self->{'subfield'} && ($self->{'subfield'} ne ""))) {
|
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| 417 | $self->{'text'} .= $_[1];
|
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| 418 | $self->{'text'} =~ s/[\n]|([ ]{2,})//g;
|
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| 419 | if($self->{'text'} ne "")
|
|---|
| 420 | {
|
|---|
| 421 | print STDERR " $self->{'subfield'}:($self->{'text'})\n";
|
|---|
| 422 | }
|
|---|
| 423 | }
|
|---|
| 424 | return undef;
|
|---|
| 425 | }
|
|---|
| 426 |
|
|---|
| 427 | sub OAI_StartTag
|
|---|
| 428 | {
|
|---|
| 429 | my ($expat, $element, %attr) = @_;
|
|---|
| 430 |
|
|---|
| 431 | $self->{'subfield'} = $element;
|
|---|
| 432 |
|
|---|
| 433 | }
|
|---|
| 434 |
|
|---|
| 435 | sub OAI_EndTag
|
|---|
| 436 | {
|
|---|
| 437 | my ($expat, $element) = @_;
|
|---|
| 438 | $self->{'text'} = "";
|
|---|
| 439 | $self->{'subfield'} = "";
|
|---|
| 440 | }
|
|---|
| 441 |
|
|---|
| 442 | sub error
|
|---|
| 443 | {
|
|---|
| 444 | my ($self,$strFunctionName,$strError) = @_;
|
|---|
| 445 | {
|
|---|
| 446 | print "Error occoured in OAIDownload.pm\n".
|
|---|
| 447 | "In Function:".$strFunctionName."\n".
|
|---|
| 448 | "Error Message:".$strError."\n";
|
|---|
| 449 | exit(-1);
|
|---|
| 450 | }
|
|---|
| 451 | }
|
|---|
| 452 |
|
|---|
| 453 |
|
|---|
| 454 |
|
|---|
| 455 | 1;
|
|---|
