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@mxchange.org>
   6  * @version             0.3.0
   7  * @copyright   Copyright(c) 2007, 2008 Roland Haeder, this is free software
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.mxchange.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          * Private constructor
  37          */
  38         private function __construct () {
  39                 // Call parent constructor
  40                 parent::constructor(__CLASS__);
  41
  42                 // Set part description
  43                 $this->setPartDescr("Verzeichnis-Handler");
  44
  45                 // Create unique ID
  46                 $this->createUniqueID();
  47
  48                 // Clean-up a little
  49                 $this->removeNumberFormaters();
  50         }
  51
  52         /**
  53          * Destructor for cleaning purposes, etc
  54          */
  55         public function __destruct() {
  56                 // Is there a resource pointer? Then we have to close the directory here!
  57                 if (is_resource($this->getPointer())) {
  58                         // Try to close a directory
  59                         $this->closeDirectory();
  60                 }
  61
  62                 // Call the parent destructor
  63                 parent::__destruct();
  64         }
  65
  66         /**
  67          * Create a directory pointer based on the given path. The path will also
  68          * be verified here.
  69          *
  70          * @param               $pathName                                       The path name we shall pass
  71          *                                                                      to opendir()
  72          * @param               $inConstructor                          If we are in de/con-structor
  73          *                                                                      or from somewhere else
  74          * @throws      PathIsEmptyException            If the provided path name
  75          *                                                                      is empty
  76          * @throws      InvalidPathStringException      If the provided path name is
  77          *                                                                      not a string
  78          * @throws      PathIsNoDirectoryException      If the provided path name is
  79          *                                                                      not valid
  80          * @throws      PathReadProtectedException      If the provided path name is
  81          *                                                                      read-protected
  82          * @throws      DirPointerNotOpened                     If opendir() returns not a
  83          *                                                                      directory resource
  84          * @return      $pointerInstance                        A prepared instance of
  85          *                                                                      FrameworkDirectoryPointer
  86          */
  87         public final static function createFrameworkDirectoryPointer ($pathName, $inConstructor = false) {
  88                 // Some pre-sanity checks...
  89                 if (is_null($pathName)) {
  90                         // No pathname given
  91                         if ($inConstructor) {
  92                                 return null;
  93                         } else {
  94                                 throw new PathIsEmptyException(null, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
  95                         }
  96                 } elseif (!is_string($pathName)) {
  97                         // Is not a string
  98                         if ($inConstructor) {
  99                                 return null;
 100                         } else {
 101                                 throw new InvalidPathStringException(null, self::EXCEPTION_INVALID_STRING);
 102                         }
 103                 } elseif (!is_dir($pathName)) {
 104                         // Not a directory
 105                         if ($inConstructor) {
 106                                 return null;
 107                         } else {
 108                                 throw new PathIsNoDirectoryException($pathName, self::EXCEPTION_INVALID_PATH_NAME);
 109                         }
 110                 } elseif (!is_readable($pathName)) {
 111                         // Not readable
 112                         if ($inConstructor) {
 113                                 return null;
 114                         } else {
 115                                 throw new PathReadProtectedException($pathName, self::EXCEPTION_READ_PROTECED_PATH);
 116                         }
 117                 }
 118
 119                 // Try to open a handler
 120                 $dirPointer = @opendir($pathName);
 121                 if (!is_resource($dirPointer)) {
 122                         // Something bad happend
 123                         if ($inConstructor) {
 124                                 return null;
 125                         } else {
 126                                 throw new DirPointerNotOpenedException($pathName, self::EXCEPTION_DIR_POINTER_INVALID);
 127                         }
 128                 }
 129
 130                 // Create new instance
 131                 $pointerInstance = new FrameworkDirectoryPointer();
 132
 133                 // Set directory pointer and path name
 134                 $pointerInstance->setPointer($dirPointer);
 135                 $pointerInstance->setPathName($pathName);
 136
 137                 // Return the instance
 138                 return $pointerInstance;
 139         }
 140
 141         /**
 142          * Read raw lines of data from a directory pointer and return the data
 143          *
 144          * @return      string  Directory and/or file names read from the current
 145          *                                      directory pointer
 146          * @throws      NullPointerException    If the directory pointer instance
 147          *                                                              is not set by setPointer()
 148          * @throws      InvalidDirectoryResourceException       If there is being set
 149          *                                                                              an invalid directory resource
 150          */
 151         public function readRawDirectory () {
 152                 if (is_null($this->getPointer())) {
 153                         // Pointer not initialized
 154                         throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
 155                 } elseif (!is_resource($this->getPointer())) {
 156                         // Pointer is not a valid resource!
 157                         throw new InvalidDirectoryResourceException($this, self::EXCEPTION_INVALID_DIRECTORY_POINTER);
 158                 }
 159
 160                 // Read data from the directory pointer and return it
 161                 return readdir($this->getPointer());
 162         }
 163
 164         /**
 165          * Read lines from the current directory pointer except some parts
 166          *
 167          * @param               $except Some parts of a directory we want to ignore.
 168          *                                      Valid: dirs
 169          *                                      Other values will be silently ignored
 170          * @return      string  Directory and/or file names read from the current
 171          *                                      directory pointer
 172          */
 173         public function readDirectoryExcept ($except = "") {
 174                 if ((empty($except)) || (!is_array($except)) || (count($except) == 0)) {
 175                         // No exception given, so read all data
 176                         return $this->readRawDirectory();
 177                 }
 178
 179                 // Read a raw line...
 180                 $rawLine = $this->readRawDirectory();
 181
 182                 // Shall we exclude directories?
 183                 if ((!is_null($rawLine)) && ($rawLine !== false) && (in_array($rawLine, $except))) {
 184                         // Exclude this part
 185                         return $this->readDirectoryExcept($except);
 186                 } elseif ((!is_null($rawLine)) && ($rawLine !== false)) {
 187                         // Return read data
 188                         return $rawLine;
 189                 }
 190
 191                 // End pointer reached
 192                 return null;
 193         }
 194
 195         /**
 196          * Close a directory source and set it's instance to null and the path name
 197          * to empty
 198          *
 199          * @return      void
 200          * @throws      NullPointerException    If the directory pointer instance
 201          *                                                              is not set by setPointer()
 202          * @throws      InvalidDirectoryResourceException       If there is being set
 203          */
 204         public function closeDirectory () {
 205                 if (is_null($this->getPointer())) {
 206                         // Pointer not initialized
 207                         return;
 208                 } elseif (!is_resource($this->getPointer())) {
 209                         // Pointer is not a valid resource!
 210                         throw new InvalidDirectoryResourceException($this, self::EXCEPTION_INVALID_DIRECTORY_POINTER);
 211                 }
 212
 213                 // Close the directory pointer and reset the instance variable
 214                 @closedir($this->getPointer());
 215                 $this->setPointer(null);
 216                 $this->setPathName("");
 217         }
 218
 219         /**
 220          * Setter for the directory pointer
 221          *
 222          * @param               $dirPointer     The directory resource
 223          * @return      void
 224          */
 225         public final function setPointer ($dirPointer) {
 226                 // Sanity-check if the pointer is a valid directory resource
 227                 if (is_resource($dirPointer) || is_null($dirPointer)) {
 228                         // Is a valid resource
 229                         $this->dirPointer = $dirPointer;
 230                 } else {
 231                         // Throw exception
 232                         throw new InvalidDirectoryResourceException($this, self::EXCEPTION_INVALID_DIRECTORY_POINTER);
 233                 }
 234         }
 235
 236         /**
 237          * Getter for the directory pointer
 238          *
 239          * @return      $dirPointer     The directory pointer which shall be a valid
 240          *                                              directory resource
 241          */
 242         public final function getPointer () {
 243                 return $this->dirPointer;
 244         }
 245
 246         /**
 247          * Setter for path name
 248          *
 249          * @param               $pathName               The new path name
 250          * @return      void
 251          */
 252         public final function setPathName ($pathName) {
 253                 $pathName = (string) $pathName;
 254                 $this->pathName = $pathName;
 255         }
 256
 257         /**
 258          * Getter for path name
 259          *
 260          * @return      $pathName               The current path name
 261          */
 262         public final function getPathName () {
 263                 return $this->pathName;
 264         }
 265 }
 266
 267 // [EOF]
 268 ?>