3 * A class for reading text files
5 * @author Roland Haeder <webmaster@shipsimu.org>
7 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2014 Core Developer Team
8 * @license GNU GPL 3.0 or any newer version
9 * @link http://www.shipsimu.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 FrameworkTextFileInputPointer extends BaseFileIo implements InputPointer {
26 * Protected constructor
30 protected function __construct () {
31 // Call parent constructor
32 parent::__construct(__CLASS__);
36 * Create a file pointer based on the given file. The file will also
39 * @param $fileName The file name we shall pass to fopen()
40 * @throws FileIsEmptyException If the provided file name is empty.
41 * @throws FileIoException If fopen() returns not a file resource
44 public static final function createFrameworkTextFileInputPointer ($fileName) {
45 // Some pre-sanity checks...
46 if ((is_null($fileName)) || (empty($fileName))) {
48 throw new FileIsEmptyException(NULL, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
49 } elseif (!file_exists($fileName)) {
50 // File does not exist!
51 throw new FileIoException($fileName, self::EXCEPTION_FILE_NOT_FOUND);
52 } elseif (!is_readable($fileName)) {
53 // File does not exist!
54 throw new FileReadProtectedException($fileName, self::EXCEPTION_FILE_CANNOT_BE_READ);
57 // Try to open a handler
58 $filePointer = fopen($fileName, 'r');
59 if ((is_null($filePointer)) || ($filePointer === FALSE)) {
60 // Something bad happend
61 throw new FileIoException($fileName, self::EXCEPTION_FILE_POINTER_INVALID);
64 // Create new instance
65 $pointerInstance = new FrameworkTextFileInputPointer();
67 // Set file pointer and file name
68 $pointerInstance->setPointer($filePointer);
69 $pointerInstance->setFileName($fileName);
71 // Return the instance
72 return $pointerInstance;
76 * Read data a file pointer
78 * @return mixed The result of fread()
79 * @throws NullPointerException If the file pointer instance
80 * is not set by setPointer()
81 * @throws InvalidResourceException If there is being set
83 public function readFromFile () {
84 if (is_null($this->getPointer())) {
85 // Pointer not initialized
86 throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
87 } elseif (!is_resource($this->getPointer())) {
88 // Pointer is not a valid resource!
89 throw new InvalidResourceException($this, self::EXCEPTION_INVALID_RESOURCE);
92 // Read data from the file pointer and return it
93 return $this->read(1024);
97 * Reads given amount of bytes from file.
99 * @param $bytes Amount of bytes to read
100 * @return $data Data read from file
102 public function read ($bytes) {
103 // Try to read given characters
104 $data = fgets($this->getPointer(), $bytes);
106 // Was this successfull?
107 assert(is_string($data));
114 * Analyzes entries in index file. This will count all found (and valid)
115 * entries, mark invalid as damaged and count gaps ("fragmentation"). If
116 * only gaps are found, the file is considered as "virgin" (no entries).
119 * @throws UnsupportedOperationException If this method is called
121 public function analyzeFile () {
122 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
126 * Advances to next "block" of bytes
129 * @throws UnsupportedOperationException If this method is called
131 public function next () {
132 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
136 * Checks wether the current entry is valid (not at the end of the file).
137 * This method will return TRUE if an emptied (nulled) entry has been found.
139 * @return $isValid Whether the next entry is valid
140 * @throws UnsupportedOperationException If this method is called
142 public function valid () {
143 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
147 * Gets current seek position ("key").
149 * @return $key Current key in iteration
150 * @throws UnsupportedOperationException If this method is called
152 public function key () {
153 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);