inc/classes/middleware/compressor/class_CompressorChannel.php

   1 <?php
   2 /**
   3  * Middleware for selecting the right compressor channel
   4  *
   5  *
   6  * @author              Roland Haeder <webmaster@ship-simu.org>
   7  * @version             0.0
   8  * @copyright   Copyright(c) 2007, 2008 Roland Haeder, this is free software
   9  * @license             GNU GPL 3.0 or any newer version
  10  *
  11  * This program is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24 class CompressorChannel extends BaseMiddleware {
  25         // Output handler instance
  26         private $compressor = null;
  27
  28         // Public constructor
  29         private function __construct () {
  30                 // Call parent constructor!
  31                 parent::constructor(__CLASS__);
  32
  33                 // Set description
  34                 $this->setPartDescr("Komprimierungshandler");
  35
  36                 // Create an unique ID
  37                 $this->createUniqueID();
  38         }
  39
  40         // Create a new compressor channel based a given compression handler
  41         public final static function createCompressorChannel ($baseDir) {
  42                 // Get new instance
  43                 $cInstance = new CompressorChannel();
  44
  45                 // Is the compressor handler set?
  46                 if (
  47                            (is_null($cInstance->getCompressor()))
  48                         || (!is_object($cInstance->getCompressor()))
  49                         || (!method_exists($cInstance->getCompressor(), 'compressStream'))
  50                         || (!method_exists($cInstance->getCompressor(), 'decompressStream'))
  51                 ) {
  52                         // Get a directory pointer
  53                         $dirPointer = FrameworkDirectoryPointer::createFrameworkDirectoryPointer($baseDir);
  54
  55                         // Read all directories but no sub directories
  56                         while ($dir = $dirPointer->readDirectoryExcept(array("..", ".", ".htaccess"))) {
  57                                 // Is this a class file?
  58                                 if ((substr($dir, 0, 6) == "class_") && (substr($dir, -4, 4) == $cInstance->getConfigInstance()->readConfig("php_extension"))) {
  59                                         // Get the compressor's name. That's why you must name
  60                                         // your files like your classes and also that's why you
  61                                         // must keep on class in one file.
  62                                         $class = substr($dir, 6, -4);
  63
  64                                         // Create eval command
  65                                         $eval = sprintf("\$tempInstance = %s::create%s();",
  66                                                 $class,
  67                                                 $class
  68                                         );
  69
  70                                         // Debug message
  71                                         if ((defined('DEBUG_EVAL')) || (defined('DEBUG_ALL'))) $cInstance->getDebugInstance()->output(sprintf("[%s:] Konstruierte PHP-Anweisung: <pre><em>%s</em></pre><br />\n",
  72                                                 $cInstance->__toString(),
  73                                                 htmlentities($eval)
  74                                         ));
  75
  76                                         // Run it. This will create an instance to the current class
  77                                         eval($eval);
  78
  79                                         // Is the instance valid? We have the stream handler here
  80                                         if ((!is_null($tempInstance)) && (method_exists($tempInstance, 'compressStream')) && (method_exists($tempInstance, 'decompressStream'))) {
  81                                                 // Okay, this handler is valid
  82                                                 $cInstance->setCompressor($tempInstance);
  83
  84                                                 // No more searches required because we have found a valid compressor stream
  85                                                 break;
  86                                         }
  87                                 }
  88                         }
  89
  90                         // Close the directory
  91                         $dirPointer->closeDirectory();
  92                 }
  93
  94                 // Check again if there is a compressor
  95                 if (
  96                            (is_null($cInstance->getCompressor()))
  97                         || (!is_object($cInstance->getCompressor()))
  98                         || (!method_exists($cInstance->getCompressor(), 'compressStream'))
  99                         || (!method_exists($cInstance->getCompressor(), 'decompressStream'))
 100                 ) {
 101                         // Set the null compressor handler
 102                         $cInstance->setCompressor(NullCompressor::createNullCompressor());
 103                 }
 104
 105                 // Return the compressor instance
 106                 return $cInstance;
 107         }
 108
 109         /**
 110          * Getter for compressor instance
 111          *
 112          * @return      $compressor     The compressor instance
 113          */
 114         public final function getCompressor () {
 115                 return $this->compressor;
 116         }
 117
 118         /**
 119          * Setter for compressor
 120          *
 121          * @param               $compressorInstance     The compressor instance we shall use
 122          * @return      void
 123          */
 124         public final function setCompressor (Compressor $compressorInstance) {
 125                 $this->compressor = $compressorInstance;
 126         }
 127
 128         /**
 129          * Getter for the file extension of the current compressor
 130          */
 131         public final function getCompressorExtension () {
 132                 // Get compressor extension from current compressor
 133                 return $this->getCompressor()->getCompressorExtension();
 134         }
 135 }
 136
 137 // [EOF]
 138 ?>