inc/classes/main/io/class_FrameworkDirectoryPointer.php

   1 <?php
   2 /**
   3  * A class for directory reading and getting its contents
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009, 2010 Core Developer Team
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.ship-simu.org
  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 FrameworkDirectoryPointer extends BaseFrameworkSystem {
  25         /**
  26          * The current path we are working in
  27          */
  28         private $pathName = '';
  29
  30         /**
  31          * The directory pointer
  32          */
  33         private $dirPointer = null;
  34
  35         /**
  36          * Protected constructor
  37          */
  38         protected function __construct () {
  39                 // Call parent constructor
  40                 parent::__construct(__CLASS__);
  41         }
  42
  43         /**
  44          * Destructor for cleaning purposes, etc
  45          */
  46         public function __destruct() {
  47                 // Is there a resource pointer? Then we have to close the directory here!
  48                 if (is_resource($this->getPointer())) {
  49                         // Try to close a directory
  50                         $this->closeDirectory();
  51                 }
  52
  53                 // Call the parent destructor
  54                 parent::__destruct();
  55         }
  56
  57         /**
  58          * Create a directory pointer based on the given path. The path will also
  59          * be verified here.
  60          *
  61          * @param       $pathName               The path name we shall pass to opendir()
  62          * @param       $inConstructor  If we are in de/con-structor or from somewhere
  63          *                                                      else
  64          * @return      $pointerInstance        A prepared instance of
  65          *                                                              FrameworkDirectoryPointer
  66          * @throws      PathIsEmptyException    If the provided path name
  67          *                                                                      is empty
  68          * @throws      InvalidPathStringException      If the provided path name is
  69          *                                                                              not a string
  70          * @throws      PathIsNoDirectoryException      If the provided path name is
  71          *                                                                              not valid
  72          * @throws      PathReadProtectedException      If the provided path name is
  73          *                                                                              read-protected
  74          * @throws      DirPointerNotOpened                     If opendir() returns not a
  75          *                                                                              directory resource
  76          */
  77         public static final function createFrameworkDirectoryPointer ($pathName, $inConstructor = false) {
  78                 // Some pre-sanity checks...
  79                 if (is_null($pathName)) {
  80                         // No pathname given
  81                         if ($inConstructor) {
  82                                 return null;
  83                         } else {
  84                                 throw new PathIsEmptyException(null, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
  85                         }
  86                 } elseif (!is_string($pathName)) {
  87                         // Is not a string
  88                         if ($inConstructor) {
  89                                 return null;
  90                         } else {
  91                                 throw new InvalidPathStringException(null, self::EXCEPTION_INVALID_STRING);
  92                         }
  93                 } elseif (!is_dir($pathName)) {
  94                         // Not a directory
  95                         if ($inConstructor) {
  96                                 return null;
  97                         } else {
  98                                 throw new PathIsNoDirectoryException($pathName, self::EXCEPTION_INVALID_PATH_NAME);
  99                         }
 100                 } elseif (!is_readable($pathName)) {
 101                         // Not readable
 102                         if ($inConstructor) {
 103                                 return null;
 104                         } else {
 105                                 throw new PathReadProtectedException($pathName, self::EXCEPTION_READ_PROTECED_PATH);
 106                         }
 107                 }
 108
 109                 // Try to open a handler
 110                 $dirPointer = @opendir($pathName);
 111                 if (!is_resource($dirPointer)) {
 112                         // Something bad happend
 113                         if ($inConstructor) {
 114                                 return null;
 115                         } else {
 116                                 throw new DirPointerNotOpenedException($pathName, self::EXCEPTION_DIR_POINTER_INVALID);
 117                         }
 118                 }
 119
 120                 // Create new instance
 121                 $pointerInstance = new FrameworkDirectoryPointer();
 122
 123                 // Set directory pointer and path name
 124                 $pointerInstance->setPointer($dirPointer);
 125                 $pointerInstance->setPathName($pathName);
 126
 127                 // Return the instance
 128                 return $pointerInstance;
 129         }
 130
 131         /**
 132          * Read raw lines of data from a directory pointer and return the data
 133          *
 134          * @return      string  Directory and/or file names read from the current
 135          *                                      directory pointer
 136          */
 137         public function readRawDirectory () {
 138                 // Read data from the directory pointer and return it
 139                 return readdir($this->getPointer());
 140         }
 141
 142         /**
 143          * Read lines from the current directory pointer except some parts
 144          *
 145          * @param               $except Some parts of a directory we want to ignore.
 146          *                                      Valid: dirs
 147          *                                      Other values will be silently ignored
 148          * @return      string  Directory and/or file names read from the current
 149          *                                      directory pointer
 150          */
 151         public function readDirectoryExcept ($except = '') {
 152                 if ((empty($except)) || (!is_array($except)) || (count($except) == 0)) {
 153                         // No exception given, so read all data
 154                         return $this->readRawDirectory();
 155                 }
 156
 157                 // Read a raw line...
 158                 $rawLine = $this->readRawDirectory();
 159
 160                 // Shall we exclude directories?
 161                 if ((!is_null($rawLine)) && ($rawLine !== false) && (in_array($rawLine, $except))) {
 162                         // Exclude this part
 163                         return $this->readDirectoryExcept($except);
 164                 } elseif ((!is_null($rawLine)) && ($rawLine !== false)) {
 165                         // Return read data
 166                         return $rawLine;
 167                 }
 168
 169                 // End pointer reached
 170                 return null;
 171         }
 172
 173         /**
 174          * Close a directory source and set it's instance to null and the path name
 175          * to empty
 176          *
 177          * @return      void
 178          */
 179         public function closeDirectory () {
 180                 // Close the directory pointer and reset the instance variable
 181                 @closedir($this->getPointer());
 182                 $this->setPointer(null);
 183                 $this->setPathName('');
 184         }
 185
 186         /**
 187          * Setter for the directory pointer
 188          *
 189          * @param               $dirPointer     The directory resource
 190          * @return      void
 191          */
 192         public final function setPointer ($dirPointer) {
 193                 // Sanity-check if pointer is a valid directory resource
 194                 if (is_resource($dirPointer) || is_null($dirPointer)) {
 195                         // Is a valid resource
 196                         $this->dirPointer = $dirPointer;
 197                 } else {
 198                         // Throw exception
 199                         throw new InvalidResourceException($this, self::EXCEPTION_INVALID_RESOURCE);
 200                 }
 201         }
 202
 203         /**
 204          * Getter for the directory pointer
 205          *
 206          * @return      $dirPointer     The directory pointer which shall be a valid
 207          *                                              directory resource
 208          */
 209         public final function getPointer () {
 210                 return $this->dirPointer;
 211         }
 212
 213         /**
 214          * Setter for path name
 215          *
 216          * @param               $pathName               The new path name
 217          * @return      void
 218          */
 219         public final function setPathName ($pathName) {
 220                 $pathName = (string) $pathName;
 221                 $this->pathName = $pathName;
 222         }
 223
 224         /**
 225          * Getter for path name
 226          *
 227          * @return      $pathName               The current path name
 228          */
 229         public final function getPathName () {
 230                 return $this->pathName;
 231         }
 232 }
 233
 234 // [EOF]
 235 ?>