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# mt-aws-glacier - Amazon Glacier sync client |
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# Copyright (C) 2012-2014 Victor Efimov |
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# http://mt-aws.com (also http://vs-dev.com) vs@vs-dev.com |
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# License: GPLv3 |
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# |
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# This file is part of "mt-aws-glacier" |
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# |
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# mt-aws-glacier is free software: you can redistribute it and/or modify |
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# it under the terms of the GNU General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# mt-aws-glacier is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU General Public License for more details. |
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# |
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# You should have received a copy of the GNU General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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package App::MtAws::FileVersions; |
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our $VERSION = '1.114_2'; |
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use strict; |
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use warnings; |
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use utf8; |
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sub new |
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{ |
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my ($class) = @_; |
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my $self = []; |
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bless $self, $class; |
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return $self; |
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} |
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sub add |
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{ |
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my ($self, $o) = @_; |
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my $after = $self->_find($o); |
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if (defined($after)) { |
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splice @$self, $after + 1, 0, $o; |
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} else { |
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unshift @$self, $o; |
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} |
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} |
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sub _find |
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{ |
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my ($self, $o) = @_; |
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my ($start, $end) = (0, $#$self); |
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while ($end >= $start) { |
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my $mid = _mid($start, $end); |
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my $r = _cmp($o, $self->[$mid]); |
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if ($r >= 0) { |
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if ($mid == $end || _cmp($o, $self->[$mid+1]) < 0) { |
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return $mid; |
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} |
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$start = $mid + 1; |
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} else { # $r < 0 |
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$end = $mid - 1; |
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} |
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} |
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return undef; |
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} |
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sub _mid |
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{ |
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use integer; |
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$_[0] + (($_[1] - $_[0])/2); |
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} |
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sub all |
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{ |
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my ($self) = @_; |
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@$self; |
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} |
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sub latest |
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{ |
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my ($self) = @_; |
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$#$self == -1 ? undef : $self->[-1]; |
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} |
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# TODO: NOT USED (YET!) |
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sub delete_by_archive_id |
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{ |
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my ($self, $archive_id) = @_; |
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for (my $i = 0; $i <= $#$self; ++$i) { # O(n) search ! |
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if ($self->[$i]{archive_id} eq $archive_id) { |
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splice @$self, $i, 1; |
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return 1; |
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} |
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} |
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return 0; |
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} |
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# alternative 1: |
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# if mtime defined for both a,b - compare mtime. otherwise compare time |
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# if mtime equal, compare time too |
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# when $a->{mtime} <=> $b->{mtime} returns 0 (equal), we magicaly switch to 'time' comparsion |
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# when $a->{mtime} <=> $b->{mtime} returns 1 or -1, we use that |
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# ( defined($a->{mtime}) && defined($b->{mtime}) && ($a->{mtime} <=> $b->{mtime}) ) || |
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# ( $a->{'time'} <=> $b->{'time'} ); |
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# alternative 2: |
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# possible alternative formula: |
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#(defined($a->{mtime}) ? $a->{mtime} : $a->{time}) <=> (defined($b->{mtime}) ? $b->{mtime} : $b->{time}) |
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sub _cmp |
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{ |
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my ($a, $b) = @_; |
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# use mtime (but if missed, use time) for both values |
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( |
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(defined($a->{mtime}) ? $a->{mtime} : $a->{time}) # mtime1 or time1 |
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<=> |
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(defined($b->{mtime}) ? $b->{mtime} : $b->{time}) # mtime2 or time2 |
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) or # if copared values are equal (i.e. mtime1=mtime2 or in some cases mtime1=time2) |
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( |
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50414
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( $a->{'time'} <=> $b->{'time'} ) # compare time |
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) |
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} |
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1; |