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<?php
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/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
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/**
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* A writer wrapper that will remove the files the eventual duplicate
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* files from the reader to keep only the new ones
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* When calling newFile, the file with the highest index in the reader
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* and the same filename will be removed
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* Note that it ensure that the archive won't have duplicates only if
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* it didn't have duplicates before, and if no two calls to newFile with
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* the same filename is done
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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: UniqueAppender.php,v 1.1 2005/05/30 19:44:53 vincentlascaux Exp $
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* @link http://pear.php.net/package/File_Archive
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*/
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require_once "File/Archive/Writer.php";
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require_once "File/Archive/Reader.php";
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require_once "File/Archive/Predicate/Index.php";
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/**
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* A writer wrapper that will remove the files the eventual duplicate
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* files from the reader to keep only the new ones
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* If there were already some duplications in the provided reader, not
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* all duplication will be removed
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* If you use newFile with the same filename several file, only the latest
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* write will be kept (no time comparision is done)
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*/
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class File_Archive_Writer_UniqueAppender extends File_Archive_Writer
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{
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var $reader;
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var $writer;
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var $fileList = array();
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var $toDelete = array();
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/**
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* Construct a unique writer that will write to the specified writer
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* and remove duplicate files from the reader on close
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*/
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function File_Archive_Writer_UniqueAppender(&$reader)
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{
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$reader->close();
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$pos = 0;
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while ($reader->next()) {
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$this->fileList[$reader->getFilename()] = $pos++;
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}
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$this->reader =& $reader;
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$this->writer = $reader->makeAppendWriter();
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}
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/**
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* @see File_Archive_Writer::newFile()
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*/
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function newFile($filename, $stat = array(), $mime = "application/octet-stream")
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{
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if (isset($this->fileList[$filename])) {
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$this->toDelete[$this->fileList[$filename]] = true;
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}
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return $this->writer->newFile($filename, $stat, $mime);
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}
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/**
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* @see File_Archive_Writer::newFromTempFile()
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*/
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function newFromTempFile($tmpfile, $filename, $stat = array(), $mime = "application/octet-stream")
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{
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if (isset($this->fileList[$filename])) {
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$this->toDelete[$this->fileList[$filename]] = true;
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}
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return $this->writer->newFromTempFile($tmpfile, $filename, $stat, $mime);
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}
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/**
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* @see File_Archive_Writer::newFileNeedsMIME()
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*/
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function newFileNeedsMIME()
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{
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return $this->writer->newFileNeedsMIME();
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}
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/**
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* @see File_Archive_Writer::writeData()
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*/
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function writeData($data)
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{
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return $this->writer->writeData($data);
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}
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/**
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* @see File_Archive_Writer::writeFile()
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*/
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function writeFile($filename)
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{
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return $this->writer->writeFile($filename);
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}
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/**
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* Close the writer, eventually flush the data, write the footer...
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* This function must be called before the end of the script
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*/
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function close()
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{
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$error = $this->writer->close();
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if (PEAR::isError($error)) {
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return $error;
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}
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if (!empty($this->toDelete)) {
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$tmp = $this->reader->makeWriterRemoveFiles(
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new File_Archive_Predicate_Index($this->toDelete)
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);
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if (PEAR::isError($tmp)) {
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return $tmp;
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}
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return $tmp->close();
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}
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}
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}
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?>
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