3 * Middleware class for selecting the right compressor channel
5 * @author Roland Haeder <webmaster@ship-simu.org>
7 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2012 Core Developer Team
8 * @license GNU GPL 3.0 or any newer version
9 * @link http://www.ship-simu.org
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.
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.
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/>.
24 class CompressorChannel extends BaseMiddleware implements Registerable {
26 * Real compressor instance
28 private $compressor = NULL;
31 * Protected constructor
35 protected function __construct () {
36 // Call parent constructor!
37 parent::__construct(__CLASS__);
41 * Create a new compressor channel.
43 * @return $compressorInstance A prepared instance of this class
45 public static final function createCompressorChannel () {
47 $compressorInstance = new CompressorChannel();
49 // Is the compressor handler set?
51 (is_null($compressorInstance->getCompressor()))
52 || (!is_object($compressorInstance->getCompressor()))
53 || (!method_exists($compressorInstance->getCompressor(), 'compressStream'))
54 || (!method_exists($compressorInstance->getCompressor(), 'decompressStream'))
56 // Init base directory
58 $compressorInstance->getConfigInstance()->getConfigEntry('base_path') .
59 $compressorInstance->getConfigInstance()->getConfigEntry('compressor_base_path');
61 // Get a directory pointer
62 $dirPointer = FrameworkDirectoryPointer::createFrameworkDirectoryPointer($baseDir);
64 // Read all directories but no sub directories
65 while ($directoryEntry = $dirPointer->readDirectoryExcept(array('..', '.', '.htaccess', '.svn', 'class_NullCompressor.php'))) {
66 // Is this a class file?
67 if ((substr($directoryEntry, 0, 6) == 'class_') && (substr($directoryEntry, -4, 4) == '.php')) {
68 /* Get the compressor's name. That's why you must name
69 * your files like your classes and also that's why you
70 * must keep on class in one file.
72 $className = substr($directoryEntry, 6, -4);
74 // Get an instance from our object factory
75 $tempInstance = ObjectFactory::createObjectByName($className);
78 if (is_null($tempInstance)) {
79 // Then skip to the next one
84 $compressorInstance->setCompressor($tempInstance);
86 // No more searches required because we have found a valid compressor stream
91 // Close the directory
92 $dirPointer->closeDirectory();
95 // Check again if there is a compressor
97 (is_null($compressorInstance->getCompressor()))
98 || (!is_object($compressorInstance->getCompressor()))
99 || (!method_exists($compressorInstance->getCompressor(), 'compressStream'))
100 || (!method_exists($compressorInstance->getCompressor(), 'decompressStream'))
102 // Set the null compressor handler. This should not be configureable!
103 $compressorInstance->setCompressor(ObjectFactory::createObjectByName('NullCompressor'));
106 // Return the compressor instance
107 return $compressorInstance;
111 * Getter for compressor instance
113 * @return $compressor The compressor instance
115 public final function getCompressor () {
116 return $this->compressor;
120 * Setter for compressor
122 * @param $compressorInstance The compressor instance we shall use
125 public final function setCompressor (Compressor $compressorInstance = NULL) {
126 $this->compressor = $compressorInstance;
130 * Getter for the file extension of the current compressor
132 public final function getCompressorExtension () {
133 // Get compressor extension from current compressor
134 return $this->getCompressor()->getCompressorExtension();