3 # Copyright (C) 2007-2009 Martin A. Hansen.
5 # This program is free software; you can redistribute it and/or
6 # modify it under the terms of the GNU General Public License
7 # as published by the Free Software Foundation; either version 2
8 # of the License, or (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19 # http://www.gnu.org/copyleft/gpl.html
22 # >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> DESCRIPTION <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
24 # Select a number of random records from the stream.
26 # >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
31 use Maasha::Biopieces;
35 # >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
38 my ( $options, $in, $out, $record, $tmp_dir, $tmp_file, $fh_out, $fh_in, $count, $i, %rand_hash, $rand, $max );
40 $options = Maasha::Biopieces::parse_options(
42 { long => 'num', short => 'n', type => 'uint', mandatory => 'no', default => 10, allowed => undef, disallowed => 0 },
46 $in = Maasha::Biopieces::read_stream( $options->{ "stream_in" } );
47 $out = Maasha::Biopieces::write_stream( $options->{ "stream_out" } );
49 $tmp_dir = Maasha::Biopieces::get_tmpdir();
50 $tmp_file = "$tmp_dir/random_records.tmp";
52 $fh_out = Maasha::Filesys::file_write_open( $tmp_file );
56 while ( $record = Maasha::Biopieces::get_record( $in ) )
58 Maasha::Biopieces::put_record( $record, $fh_out );
68 Maasha::Common::error( qq(Requested random records > records in stream) ) if $options->{ "num" } > $count;
70 while ( $i < $options->{ "num" } )
72 $rand = int( rand( $count ) );
74 if ( not exists $rand_hash{ $rand } )
76 $rand_hash{ $rand } = 1;
78 $max = $rand if $rand > $max;
84 $fh_in = Maasha::Filesys::file_read_open( $tmp_file );
88 while ( $record = Maasha::Biopieces::get_record( $fh_in ) )
90 Maasha::Biopieces::put_record( $record, $out ) if exists $rand_hash{ $count };
92 last if $count == $max;
101 Maasha::Biopieces::close_stream( $in );
102 Maasha::Biopieces::close_stream( $out );
105 # >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
110 Maasha::Biopieces::status_set();
116 Maasha::Biopieces::status_log();
120 # >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<