framework/main/classes/file_directories/input/text/class_FrameworkTextFileInputPointer.php

   1 <?php
   2 // Own namespace
   3 namespace Org\Mxchange\CoreFramework\Filesystem\Pointer\Input;
   4
   5 // Import framework stuff
   6 use Org\Mxchange\CoreFramework\Bootstrap\FrameworkBootstrap;
   7 use Org\Mxchange\CoreFramework\Filesystem\BaseFileIo;
   8 use Org\Mxchange\CoreFramework\Filesystem\FileIoException;
   9 use Org\Mxchange\CoreFramework\Filesystem\FileNotFoundException;
  10 use Org\Mxchange\CoreFramework\Filesystem\FileReadProtectedException;
  11 use Org\Mxchange\CoreFramework\Filesystem\Pointer\InputPointer;
  12 use Org\Mxchange\CoreFramework\Generic\FrameworkInterface;
  13 use Org\Mxchange\CoreFramework\Generic\NullPointerException;
  14 use Org\Mxchange\CoreFramework\Generic\UnsupportedOperationException;
  15 use Org\Mxchange\CoreFramework\Object\BaseFrameworkSystem;
  16
  17 // Import SPL stuff
  18 use \SplFileInfo;
  19 use \SplFileObject;
  20
  21 /**
  22  * A class for reading text files
  23  *
  24  * @author              Roland Haeder <webmaster@shipsimu.org>
  25  * @version             0.0.0
  26  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2022 Core Developer Team
  27  * @license             GNU GPL 3.0 or any newer version
  28  * @link                http://www.shipsimu.org
  29  *
  30  * This program is free software: you can redistribute it and/or modify
  31  * it under the terms of the GNU General Public License as published by
  32  * the Free Software Foundation, either version 3 of the License, or
  33  * (at your option) any later version.
  34  *
  35  * This program is distributed in the hope that it will be useful,
  36  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  37  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  38  * GNU General Public License for more details.
  39  *
  40  * You should have received a copy of the GNU General Public License
  41  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  42  */
  43 class FrameworkTextFileInputPointer extends BaseFileIo implements InputPointer {
  44         /**
  45          * Protected constructor
  46          *
  47          * @return      void
  48          */
  49         private function __construct () {
  50                 // Call parent constructor
  51                 parent::__construct(__CLASS__);
  52         }
  53
  54         /**
  55          * Create a file pointer based on the given file. The file will also
  56          * be verified here.
  57          *
  58          * @param       $fileName       The file name we shall pass to fopen()
  59          * @throws      FileIoException                         If the file is not reachable
  60          * @throws      FileReadProtectedException      If the file cannot be read from
  61          * @return      void
  62          */
  63         public static final function createFrameworkTextFileInputPointer (SplFileInfo $fileInstance) {
  64                 // Check parameter
  65                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('RAW-FILE-INPUT-POINTER: fileInstance[%s]=%s - CALLED!', get_class($fileInstance), $fileInstance->__toString()));
  66                 if (!FrameworkBootstrap::isReachableFilePath($fileInstance)) {
  67                         // File cannot be reached
  68                         throw new FileIoException($fileInstance, self::EXCEPTION_FILE_NOT_REACHABLE);
  69                 } elseif ((!FrameworkBootstrap::isReadableFile($fileInstance)) && (!$fileInstance->isFile())) {
  70                         // File does not exist!
  71                         throw new FileNotFoundException($fileInstance, self::EXCEPTION_FILE_CANNOT_BE_READ);
  72                 } elseif ((!FrameworkBootstrap::isReadableFile($fileInstance)) && ($fileInstance->isFile())) {
  73                         // File cannot be read from (but exists)
  74                         throw new FileReadProtectedException($fileInstance, self::EXCEPTION_FILE_CANNOT_BE_READ);
  75                 }
  76
  77                 // Try to open a handler
  78                 $fileObject = $fileInstance->openFile('r');
  79
  80                 // Is it valid?
  81                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('TEXT-FILE-INPUT-POINTER: fileObject[]=%s', gettype($fileObject)));
  82                 if (!($fileObject instanceof SplFileObject)) {
  83                         // Something bad happend
  84                         throw new FileIoException($fileInstance, self::EXCEPTION_FILE_POINTER_INVALID);
  85                 }
  86
  87                 // Create new instance
  88                 $pointerInstance = new FrameworkTextFileInputPointer();
  89
  90                 // Set file pointer and file name
  91                 $pointerInstance->setFileObject($fileObject);
  92
  93                 // Return the instance
  94                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('TEXT-FILE-INPUT-POINTER: pointerInstance=%s - EXIT!', $pointerInstance->__toString()));
  95                 return $pointerInstance;
  96         }
  97
  98         /**
  99          * Read data a file pointer
 100          *
 101          * @return      $data   Read data from file
 102          */
 103         public function readFromFile () {
 104                 // Read 1024 Byte data from the file pointer and return it
 105                 return $this->read(1024);
 106         }
 107
 108         /**
 109          * Reads a line, maximum 4096 Bytes from current file pointer
 110          *
 111          * @return      $data   Read data from file
 112          */
 113         public function readLine () {
 114                 // Read whole line from the file pointer and return it
 115                 return $this->read();
 116         }
 117
 118         /**
 119          * Reads given amount of bytes from file.
 120          *
 121          * @param       $bytes  Amount of bytes to read or whole line (only text files)
 122          * @return      $data   Data read from file
 123          * @throws      OutOfBoundsException    If the position is not seekable
 124          * @throws      NullPointerException    If the file pointer instance is not set by setFileObject()
 125          * @throws      LogicException  If $fileObject is not an object
 126          */
 127         public function read (int $bytes = 0) {
 128                 // Some sanity checks
 129                 if ($bytes < 0) {
 130                         // Cannot be below zero
 131                         throw new OutOfBoundsException(sprintf('bytes=%d is not valid', $bytes));
 132                 } elseif (is_null($this->getFileObject())) {
 133                         // Pointer not initialized
 134                         throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
 135                 } elseif (!is_object($this->getFileObject())) {
 136                         // Pointer is not a valid resource!
 137                         throw new LogicException(sprintf('this->fileObject[]=%s is no object', gettype($this->getFileObject())), FrameworkInterface::EXCEPTION_LOGIC_EXCEPTION);
 138                 }
 139
 140                 // Is $bytes set?
 141                 if ($bytes > 0) {
 142                         // Try to read given characters
 143                         $data = $this->getFileObject()->fread($bytes);
 144                 } else {
 145                         // Try to read whole line
 146                         $data = $this->getFileObject()->fgets();
 147                 }
 148
 149                 // Then return it
 150                 return $data;
 151         }
 152
 153         /**
 154          * Analyzes entries in index file. This will count all found (and valid)
 155          * entries, mark invalid as damaged and count gaps ("fragmentation"). If
 156          * only gaps are found, the file is considered as "virgin" (no entries).
 157          *
 158          * @return      void
 159          * @throws      UnsupportedOperationException   If this method is called
 160          */
 161         public function analyzeFileStructure () {
 162                 throw new UnsupportedOperationException([$this, __FUNCTION__], self::EXCEPTION_UNSPPORTED_OPERATION);
 163         }
 164
 165         /**
 166          * Advances to next "block" of bytes
 167          *
 168          * @return      void
 169          * @throws      UnsupportedOperationException   If this method is called
 170          */
 171         public function next () {
 172                 throw new UnsupportedOperationException([$this, __FUNCTION__], self::EXCEPTION_UNSPPORTED_OPERATION);
 173         }
 174
 175         /**
 176          * Checks wether the current entry is valid (not at the end of the file).
 177          * This method will return true if an emptied (nulled) entry has been found.
 178          *
 179          * @return      $isValid        Whether the next entry is valid
 180          * @throws      UnsupportedOperationException   If this method is called
 181          */
 182         public function valid () {
 183                 throw new UnsupportedOperationException([$this, __FUNCTION__], self::EXCEPTION_UNSPPORTED_OPERATION);
 184         }
 185
 186         /**
 187          * Gets current seek position ("key").
 188          *
 189          * @return      $key    Current key in iteration
 190          * @throws      UnsupportedOperationException   If this method is called
 191          */
 192         public function key () {
 193                 throw new UnsupportedOperationException([$this, __FUNCTION__], self::EXCEPTION_UNSPPORTED_OPERATION);
 194         }
 195
 196 }