116 Zeilen
3.8 KiB
PHP
116 Zeilen
3.8 KiB
PHP
<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* Evaluates to true if a for the files for which a newer version
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* can be found in a specified archive
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* Comparison is by default made on dates of the files, or position
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* in the archive (if two files have the same date or the date of a
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* file is not specified).
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*
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* PHP versions 4 and 5
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330,Boston,MA 02111-1307 USA
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*
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* @category File Formats
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* @package File_Archive
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* @author Vincent Lascaux <vincentlascaux@php.net>
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* @copyright 1997-2005 The PHP Group
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* @license http://www.gnu.org/copyleft/lesser.html LGPL
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* @version CVS: $Id: Duplicate.php 2 2010-11-23 14:32:26Z oldperl $
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* @link http://pear.php.net/package/File_Archive
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*/
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require_once "File/Archive/Predicate.php";
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/**
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* Evaluates to true if a for the files for which a newer version
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* can be found in a specified archive
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* Comparison is by default made on dates of the files, or position
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* in the archive (if two files have the same date or the date of a
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* file is not specified).
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*/
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class File_Archive_Predicate_Duplicate extends File_Archive_Predicate
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{
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/**
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* @var array Key is the filename, value is an array of date (index 0) and
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* position in the archive (index) 1 of the newest entry with this filename
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*/
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var $newest = array();
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/**
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* @var int The current position of the file in the source
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*/
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var $pos = 0;
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/**
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* @param File_Archive_Reader $source The source will be inspected to find
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* the date of old files
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* The predicate should then be used on the same source to remove the
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* old duplicate files
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*/
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function File_Archive_Predicate_Duplicate(&$source)
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{
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//Ensure we are at the begining of the file
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$source->close();
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$pos = 0;
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while ($source->next()) {
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$filename = $source->getFilename();
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$stat = $source->getStat();
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$value = isset($this->newest[$filename]) ? $this->newest[$filename] : null;
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if ($value === null ||
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$this->compare($stat[9], $value[0]) >= 0
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) {
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$this->newest[$filename] = array($stat[9], $pos);
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}
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$pos++;
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}
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}
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/**
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* Compare the dates of two files. null is considered infinitely old
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*
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* @return int < 0 if $a can be considered older than $b
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* = 0 if $a and $b can be considered same age
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* > 0 if $a can be considered newer than $b
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*/
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function compare($a, $b) {
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return ($a === null ? -1 : $a) - ($b === null ? -1 : $b);
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}
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/**
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* @see File_Archive_Predicate::isTrue()
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*/
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function isTrue(&$source)
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{
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$filename = $source->getFilename();
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$stat = $source->getStat();
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$value = isset($this->newest[$filename]) ? $this->newest[$filename] : null;
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if ($value === null) {
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$delete = false;
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} else {
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$comp = $this->compare($stat[9], $value[0]);
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$delete = $comp < 0 ||
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($comp == 0 && $this->pos != $value[1]);
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}
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$this->pos++;
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return $delete;
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}
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}
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?>
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