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[core.git] / inc / main / classes / file_directories / input / text / class_FrameworkTextFileInputPointer.php
1 <?php
2 // Own namespace
3 namespace CoreFramework\Filesystem\Pointer\Input;
4
5 // Import framework stuff
6 use CoreFramework\Object\BaseFrameworkSystem;
7
8 /**
9  * A class for reading text files
10  *
11  * @author              Roland Haeder <webmaster@shipsimu.org>
12  * @version             0.0.0
13  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2017 Core Developer Team
14  * @license             GNU GPL 3.0 or any newer version
15  * @link                http://www.shipsimu.org
16  *
17  * This program is free software: you can redistribute it and/or modify
18  * it under the terms of the GNU General Public License as published by
19  * the Free Software Foundation, either version 3 of the License, or
20  * (at your option) any later version.
21  *
22  * This program is distributed in the hope that it will be useful,
23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25  * GNU General Public License for more details.
26  *
27  * You should have received a copy of the GNU General Public License
28  * along with this program. If not, see <http://www.gnu.org/licenses/>.
29  */
30 class FrameworkTextFileInputPointer extends BaseFileIo implements InputPointer {
31         /**
32          * Protected constructor
33          *
34          * @return      void
35          */
36         protected function __construct () {
37                 // Call parent constructor
38                 parent::__construct(__CLASS__);
39         }
40
41         /**
42          * Create a file pointer based on the given file. The file will also
43          * be verified here.
44          *
45          * @param       $fileName       The file name we shall pass to fopen()
46          * @throws      FileIsEmptyException            If the provided file name is empty.
47          * @throws      FileIoException                         If the file is not reachable
48          * @throws      FileReadProtectedException      If the file cannot be read from
49          * @return      void
50          */
51         public static final function createFrameworkTextFileInputPointer ($fileName) {
52                 // Some pre-sanity checks...
53                 if ((is_null($fileName)) || (empty($fileName))) {
54                         // No filename given
55                         throw new FileIsEmptyException(NULL, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
56                 } elseif (!BaseFrameworkSystem::isReachableFilePath($fileName)) {
57                         // File cannot be reached
58                         throw new FileIoException($fileName, self::EXCEPTION_FILE_NOT_REACHABLE);
59                 } elseif ((!BaseFrameworkSystem::isReadableFile($fileName)) && (!file_exists($fileName))) {
60                         // File does not exist!
61                         throw new FileNotFoundException($fileName, self::EXCEPTION_FILE_CANNOT_BE_READ);
62                 } elseif ((!BaseFrameworkSystem::isReadableFile($fileName)) && (file_exists($fileName))) {
63                         // File cannot be read from (but exists)
64                         throw new FileReadProtectedException($fileName, self::EXCEPTION_FILE_CANNOT_BE_READ);
65                 }
66
67                 // Try to open a handler
68                 $filePointer = fopen($fileName, 'r');
69                 if ((is_null($filePointer)) || ($filePointer === FALSE)) {
70                         // Something bad happend
71                         throw new FileIoException($fileName, self::EXCEPTION_FILE_POINTER_INVALID);
72                 } // END - if
73
74                 // Create new instance
75                 $pointerInstance = new FrameworkTextFileInputPointer();
76
77                 // Set file pointer and file name
78                 $pointerInstance->setPointer($filePointer);
79                 $pointerInstance->setFileName($fileName);
80
81                 // Return the instance
82                 return $pointerInstance;
83         }
84
85         /**
86          * Read data a file pointer
87          *
88          * @return      $data   Read data from file
89          */
90         public function readFromFile () {
91                 // Read 1024 Byte data from the file pointer and return it
92                 return $this->read(1024);
93         }
94
95         /**
96          * Reads a line, maximum 4096 Bytes from current file pointer
97          *
98          * @return      $data   Read data from file
99          */
100         public function readLine () {
101                 // Read whole line from the file pointer and return it
102                 return $this->read();
103         }
104
105         /**
106          * Reads given amount of bytes from file.
107          *
108          * @param       $bytes  Amount of bytes to read or whole line (only text files)
109          * @return      $data   Data read from file
110          * @throws      NullPointerException    If the file pointer instance
111          *                                                                      is not set by setPointer()
112          * @throws      InvalidResourceException        If there is being set
113          */
114         public function read ($bytes = NULL) {
115                 // Some sanity checks
116                 if (is_null($this->getPointer())) {
117                         // Pointer not initialized
118                         throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
119                 } elseif (!is_resource($this->getPointer())) {
120                         // Pointer is not a valid resource!
121                         throw new InvalidResourceException($this, self::EXCEPTION_INVALID_RESOURCE);
122                 }
123
124                 // Is $bytes set?
125                 if (is_int($bytes)) {
126                         // Try to read given characters
127                         $data = fgets($this->getPointer(), $bytes);
128                 } else {
129                         // Try to read whole line
130                         $data = fgets($this->getPointer());
131                 }
132
133                 // Then return it
134                 return $data;
135         }
136
137         /**
138          * Analyzes entries in index file. This will count all found (and valid)
139          * entries, mark invalid as damaged and count gaps ("fragmentation"). If
140          * only gaps are found, the file is considered as "virgin" (no entries).
141          *
142          * @return      void
143          * @throws      UnsupportedOperationException   If this method is called
144          */
145         public function analyzeFile () {
146                 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
147         }
148
149         /**
150          * Advances to next "block" of bytes
151          *
152          * @return      void
153          * @throws      UnsupportedOperationException   If this method is called
154          */
155         public function next () {
156                 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
157         }
158
159         /**
160          * Checks wether the current entry is valid (not at the end of the file).
161          * This method will return TRUE if an emptied (nulled) entry has been found.
162          *
163          * @return      $isValid        Whether the next entry is valid
164          * @throws      UnsupportedOperationException   If this method is called
165          */
166         public function valid () {
167                 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
168         }
169
170         /**
171          * Gets current seek position ("key").
172          *
173          * @return      $key    Current key in iteration
174          * @throws      UnsupportedOperationException   If this method is called
175          */
176         public function key () {
177                 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
178         }
179
180 }