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[core.git] / framework / main / classes / stacker / file / class_BaseFileStack.php
1 <?php
2 // Own namespace
3 namespace Org\Mxchange\CoreFramework\Stacker\Filesystem;
4
5 // Import framework stuff
6 use Org\Mxchange\CoreFramework\Factory\Filesystem\Stack\FileStackIndexFactory;
7 use Org\Mxchange\CoreFramework\Factory\ObjectFactory;
8 use Org\Mxchange\CoreFramework\Filesystem\File\BaseBinaryFile;
9 use Org\Mxchange\CoreFramework\Generic\UnsupportedOperationException;
10 use Org\Mxchange\CoreFramework\Iterator\Filesystem\SeekableWritableFileIterator;
11 use Org\Mxchange\CoreFramework\Stacker\BaseStacker;
12
13 // Import SPL stuff
14 use \SplFileInfo;
15
16 /**
17  * A general file-based stack class
18  *
19  * @author              Roland Haeder <webmaster@ship-simu.org>
20  * @version             0.0.0
21  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2017 Core Developer Team
22  * @license             GNU GPL 3.0 or any newer version
23  * @link                http://www.ship-simu.org
24  *
25  * This program is free software: you can redistribute it and/or modify
26  * it under the terms of the GNU General Public License as published by
27  * the Free Software Foundation, either version 3 of the License, or
28  * (at your option) any later version.
29  *
30  * This program is distributed in the hope that it will be useful,
31  * but WITHOUT ANY WARRANTY; without even the implied warranty of
32  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
33  * GNU General Public License for more details.
34  *
35  * You should have received a copy of the GNU General Public License
36  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
37  */
38 abstract class BaseFileStack extends BaseStacker {
39         /**
40          * Magic for this stack
41          */
42         const STACK_MAGIC = 'STACKv0.1';
43
44         /**
45          * Name of array index for gap position
46          */
47         const ARRAY_INDEX_GAP_POSITION = 'gap';
48
49         /**
50          * Name of array index for hash
51          */
52         const ARRAY_INDEX_HASH = 'hash';
53
54         /**
55          * Name of array index for length of raw data
56          */
57         const ARRAY_INDEX_DATA_LENGTH = 'length';
58
59         /**
60          * Protected constructor
61          *
62          * @param       $className      Name of the class
63          * @return      void
64          */
65         protected function __construct ($className) {
66                 // Call parent constructor
67                 parent::__construct($className);
68         }
69
70         /**
71          * Reads the file header
72          *
73          * @return      void
74          * @todo        To hard assertions here, better rewrite them to exceptions
75          */
76         public function readFileHeader () {
77                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
78
79                 // First rewind to beginning as the header sits at the beginning ...
80                 $this->getIteratorInstance()->rewind();
81
82                 // Then read it (see constructor for calculation)
83                 $data = $this->getIteratorInstance()->read($this->getIteratorInstance()->getHeaderSize());
84                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Read %d bytes (%d wanted).', __METHOD__, __LINE__, strlen($data), $this->getIteratorInstance()->getHeaderSize()));
85
86                 // Have all requested bytes been read?
87                 assert(strlen($data) == $this->getIteratorInstance()->getHeaderSize());
88                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
89
90                 // Last character must be the separator
91                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] data(-1)=%s', __METHOD__, __LINE__, dechex(ord(substr($data, -1, 1)))));
92                 assert(substr($data, -1, 1) == chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES));
93                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
94
95                 // Okay, then remove it
96                 $data = substr($data, 0, -1);
97
98                 // And update seek position
99                 $this->getIteratorInstance()->updateSeekPosition();
100
101                 /*
102                  * Now split it:
103                  *
104                  * 0 => magic
105                  * 1 => total entries
106                  * 2 => current seek position
107                  */
108                 $header = explode(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA), $data);
109
110                 // Set header here
111                 $this->getIteratorInstance()->setHeader($header);
112
113                 // Check if the array has only 3 elements
114                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] header(%d)=%s', __METHOD__, __LINE__, count($header), print_r($header, true)));
115                 assert(count($header) == 3);
116                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
117
118                 // Check magic
119                 assert($header[0] == self::STACK_MAGIC);
120                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
121
122                 // Check length of count and seek position
123                 assert(strlen($header[1]) == BaseBinaryFile::LENGTH_COUNT);
124                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
125                 assert(strlen($header[2]) == BaseBinaryFile::LENGTH_POSITION);
126                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
127
128                 // Decode count and seek position
129                 $header[1] = hex2bin($header[1]);
130                 $header[2] = hex2bin($header[2]);
131
132                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
133         }
134
135         /**
136          * Flushes the file header
137          *
138          * @return      void
139          */
140         public function flushFileHeader () {
141                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
142
143                 // Put all informations together
144                 $header = sprintf('%s%s%s%s%s%s',
145                         // Magic
146                         self::STACK_MAGIC,
147
148                         // Separator magic<->count
149                         chr(BaseBinaryFile::SEPARATOR_HEADER_DATA),
150
151                         // Total entries (will be zero) and pad it to 20 chars
152                         str_pad($this->dec2hex($this->getIteratorInstance()->getCounter()), BaseBinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
153
154                         // Separator count<->seek position
155                         chr(BaseBinaryFile::SEPARATOR_HEADER_DATA),
156
157                         // Position (will be zero)
158                         str_pad($this->dec2hex($this->getIteratorInstance()->getSeekPosition(), 2), BaseBinaryFile::LENGTH_POSITION, '0', STR_PAD_LEFT),
159
160                         // Separator position<->entries
161                         chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES)
162                 );
163
164                 // Write it to disk (header is always at seek position 0)
165                 $this->getIteratorInstance()->writeData(0, $header, false);
166
167                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
168         }
169
170         /**
171          * Initializes this file-based stack.
172          *
173          * @param       $fileInfoInstance       An instance of a SplFileInfo class
174          * @param       $type           Type of this stack (e.g. url_source for URL sources)
175          * @return      void
176          * @todo        Currently the stack file is not cached, please implement a memory-handling class and if enough RAM is found, cache the whole stack file.
177          */
178         protected function initFileStack (SplFileInfo $fileInfoInstance, $type) {
179                 // Get a stack file instance
180                 $fileInstance = ObjectFactory::createObjectByConfiguredName('stack_file_class', array($fileInfoInstance, $this));
181
182                 // Get iterator instance
183                 $iteratorInstance = ObjectFactory::createObjectByConfiguredName('file_iterator_class', array($fileInstance));
184
185                 // Is the instance implementing the right interface?
186                 assert($iteratorInstance instanceof SeekableWritableFileIterator);
187
188                 // Set iterator here
189                 $this->setIteratorInstance($iteratorInstance);
190
191                 // Calculate header size
192                 $this->getIteratorInstance()->setHeaderSize(
193                         strlen(self::STACK_MAGIC) +
194                         strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA)) +
195                         BaseBinaryFile::LENGTH_COUNT +
196                         strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA)) +
197                         BaseBinaryFile::LENGTH_POSITION +
198                         strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES))
199                 );
200
201                 // Init counters and gaps array
202                 $this->getIteratorInstance()->initCountersGapsArray();
203
204                 // Is the file's header initialized?
205                 if (!$this->getIteratorInstance()->isFileHeaderInitialized()) {
206                         // No, then create it (which may pre-allocate the stack)
207                         $this->getIteratorInstance()->createFileHeader();
208
209                         // And pre-allocate a bit
210                         $this->getIteratorInstance()->preAllocateFile('file_stack');
211                 } // END - if
212
213                 // Load the file header
214                 $this->readFileHeader();
215
216                 // Count all entries in file
217                 $this->getIteratorInstance()->analyzeFile();
218
219                 /*
220                  * Get stack index instance. This can be used for faster
221                  * "defragmentation" and startup.
222                  */
223                 $indexInstance = FileStackIndexFactory::createFileStackIndexInstance($fileInfoInstance, $type);
224
225                 // And set it here
226                 $this->setIndexInstance($indexInstance);
227         }
228
229         /**
230          * Adds a value to given stack
231          *
232          * @param       $stackerName    Name of the stack
233          * @param       $value                  Value to add to this stacker
234          * @return      void
235          * @throws      FullStackerException    If the stack is full
236          */
237         protected function addValue ($stackerName, $value) {
238                 // Do some tests
239                 if ($this->isStackFull($stackerName)) {
240                         // Stacker is full
241                         throw new FullStackerException(array($this, $stackerName, $value), self::EXCEPTION_STACKER_IS_FULL);
242                 } // END - if
243
244                 // Debug message
245                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName . ',value[' . gettype($value) . ']=' . print_r($value, true));
246
247                 // No objects/resources are allowed as their serialization takes to long
248                 assert(!is_object($value));
249                 assert(!is_resource($value));
250
251                 /*
252                  * Now add the value to the file stack which returns gap position, a
253                  * hash and length of the raw data.
254                  */
255                 $data = $this->getIteratorInstance()->writeValueToFile($stackerName, $value);
256
257                 // Add the hash and gap position to the index
258                 $this->getIndexInstance()->addHashToIndex($stackerName, $data);
259         }
260
261         /**
262          * Get last value from named stacker
263          *
264          * @param       $stackerName    Name of the stack
265          * @return      $value                  Value of last added value
266          * @throws      EmptyStackerException   If the stack is empty
267          */
268         protected function getLastValue ($stackerName) {
269                 // Is the stack not yet initialized or full?
270                 if ($this->isStackEmpty($stackerName)) {
271                         // Throw an exception
272                         throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
273                 } // END - if
274
275                 // Now get the last value
276                 /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
277                 $value = NULL;
278
279                 // Return it
280                 return $value;
281         }
282
283         /**
284          * Get first value from named stacker
285          *
286          * @param       $stackerName    Name of the stack
287          * @return      $value                  Value of last added value
288          * @throws      EmptyStackerException   If the stack is empty
289          */
290         protected function getFirstValue ($stackerName) {
291                 // Is the stack not yet initialized or full?
292                 if ($this->isStackEmpty($stackerName)) {
293                         // Throw an exception
294                         throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
295                 } // END - if
296
297                 // Now get the first value
298                 /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
299                 $value = NULL;
300
301                 // Return it
302                 return $value;
303         }
304
305         /**
306          * "Pops" last entry from stack
307          *
308          * @param       $stackerName    Name of the stack
309          * @return      $value                  Value "poped" from array
310          * @throws      EmptyStackerException   If the stack is empty
311          */
312         protected function popLast ($stackerName) {
313                 // Is the stack not yet initialized or full?
314                 if ($this->isStackEmpty($stackerName)) {
315                         // Throw an exception
316                         throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
317                 } // END - if
318
319                 // Now, remove the last entry, we don't care about the return value here, see elseif() block above
320                 /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
321                 return NULL;
322         }
323
324         /**
325          * "Pops" first entry from stack
326          *
327          * @param       $stackerName    Name of the stack
328          * @return      $value                  Value "shifted" from array
329          * @throws      EmptyStackerException   If the named stacker is empty
330          */
331         protected function popFirst ($stackerName) {
332                 // Is the stack not yet initialized or full?
333                 if ($this->isStackEmpty($stackerName)) {
334                         // Throw an exception
335                         throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
336                 } // END - if
337
338                 // Now, remove the last entry, we don't care about the return value here, see elseif() block above
339                 /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
340                 return NULL;
341         }
342
343         /**
344          * Checks whether the given stack is full
345          *
346          * @param       $stackerName    Name of the stack
347          * @return      $isFull                 Whether the stack is full
348          */
349         protected function isStackFull ($stackerName) {
350                 // File-based stacks will only run full if the disk space is low.
351                 // @TODO Please implement this, returning false
352                 $isFull = false;
353
354                 // Return result
355                 return $isFull;
356         }
357
358         /**
359          * Checks whether the given stack is empty
360          *
361          * @param       $stackerName            Name of the stack
362          * @return      $isEmpty                        Whether the stack is empty
363          * @throws      NoStackerException      If given stack is missing
364          */
365         public function isStackEmpty ($stackerName) {
366                 // So, is the stack empty?
367                 $isEmpty = (($this->getStackCount($stackerName)) == 0);
368
369                 // Return result
370                 return $isEmpty;
371         }
372
373         /**
374          * Initializes given stacker
375          *
376          * @param       $stackerName    Name of the stack
377          * @param       $forceReInit    Force re-initialization
378          * @return      void
379          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
380          */
381         public function initStack ($stackerName, $forceReInit = false) {
382                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
383         }
384
385         /**
386          * Initializes all stacks
387          *
388          * @return      void
389          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
390          */
391         public function initStacks (array $stacks, $forceReInit = false) {
392                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
393         }
394
395         /**
396          * Checks whether the given stack is initialized (set in array $stackers)
397          *
398          * @param       $stackerName    Name of the stack
399          * @return      $isInitialized  Whether the stack is initialized
400          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
401          */
402         public function isStackInitialized ($stackerName) {
403                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
404         }
405
406         /**
407          * Determines whether the EOF has been reached
408          *
409          * @return      $isEndOfFileReached             Whether the EOF has been reached
410          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
411          */
412         public function isEndOfFileReached () {
413                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
414         }
415
416         /**
417          * Getter for size of given stack (array count)
418          *
419          * @param       $stackerName    Name of the stack
420          * @return      $count                  Size of stack (array count)
421          */
422         public function getStackCount ($stackerName) {
423                 // Now, simply return the found count value, this must be up-to-date then!
424                 return $this->getIteratorInstance()->getCounter();
425         }
426
427         /**
428          * Calculates minimum length for one entry/block
429          *
430          * @return      $length         Minimum length for one entry/block
431          */
432         public function calculateMinimumBlockLength () {
433                 // Calulcate it
434                 $length =
435                         // Length of entry group
436                         BaseBinaryFile::LENGTH_GROUP + strlen(chr(BaseBinaryFile::SEPARATOR_GROUP_HASH)) +
437                         // Hash + value
438                         self::getHashLength() + strlen(chr(BaseBinaryFile::SEPARATOR_HASH_VALUE)) + 1 +
439                         // Final separator
440                         strlen(chr(BaseBinaryFile::SEPARATOR_ENTRIES));
441
442                 // Return it
443                 return $length;
444         }
445
446         /**
447          * Initializes counter for valid entries, arrays for damaged entries and
448          * an array for gap seek positions. If you call this method on your own,
449          * please re-analyze the file structure. So you are better to call
450          * analyzeFile() instead of this method.
451          *
452          * @return      void
453          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
454          */
455         public function initCountersGapsArray () {
456                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
457         }
458
459         /**
460          * Getter for header size
461          *
462          * @return      $totalEntries   Size of file header
463          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
464          */
465         public final function getHeaderSize () {
466                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
467         }
468
469         /**
470          * Setter for header size
471          *
472          * @param       $headerSize             Size of file header
473          * @return      void
474          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
475          */
476         public final function setHeaderSize ($headerSize) {
477                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
478         }
479
480         /**
481          * Getter for header array
482          *
483          * @return      $totalEntries   Size of file header
484          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
485          */
486         public final function getHeader () {
487                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
488         }
489
490         /**
491          * Setter for header
492          *
493          * @param       $header         Array for a file header
494          * @return      void
495          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
496          */
497         public final function setHeader (array $header) {
498                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
499         }
500
501         /**
502          * Updates seekPosition attribute from file to avoid to much access on file.
503          *
504          * @return      void
505          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
506          */
507         public function updateSeekPosition () {
508                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
509         }
510
511         /**
512          * Getter for total entries
513          *
514          * @return      $totalEntries   Total entries in this file
515          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
516          */
517         public final function getCounter () {
518                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
519         }
520
521         /**
522          * Writes data at given position
523          *
524          * @param       $seekPosition   Seek position
525          * @param       $data                   Data to be written
526          * @param       $flushHeader    Whether to flush the header (default: flush)
527          * @return      void
528          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
529          */
530         public function writeData ($seekPosition, $data, $flushHeader = true) {
531                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] seekPosition=%s,data[]=%s,flushHeader=%d', __METHOD__, __LINE__, $seekPosition, gettype($data), intval($flushHeader)));
532                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
533         }
534
535         /**
536          * Writes given value to the file and returns a hash and gap position for it
537          *
538          * @param       $groupId        Group identifier
539          * @param       $value          Value to be added to the stack
540          * @return      $data           Hash and gap position
541          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
542          */
543         public function writeValueToFile ($groupId, $value) {
544                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,value[%s]=%s', __METHOD__, __LINE__, $groupId, gettype($value), print_r($value, true)));
545                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
546         }
547
548         /**
549          * Searches for next suitable gap the given length of data can fit in
550          * including padding bytes.
551          *
552          * @param       $length                 Length of raw data
553          * @return      $seekPosition   Found next gap's seek position
554          * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
555          */
556         public function searchNextGap ($length) {
557                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] length=%s', __METHOD__, __LINE__, $length));
558                 throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
559         }
560
561         /**
562          * "Getter" for file size
563          *
564          * @return      $fileSize       Size of currently loaded file
565          */
566         public function getFileSize () {
567                 // Call iterator's method
568                 return $this->getIteratorInstance()->getFileSize();
569         }
570
571         /**
572          * Writes given raw data to the file and returns a gap position and length
573          *
574          * @param       $groupId        Group identifier
575          * @param       $hash           Hash from encoded value
576          * @param       $encoded        Encoded value to be written to the file
577          * @return      $data           Gap position and length of the raw data
578          */
579         public function writeDataToFreeGap ($groupId, $hash, $encoded) {
580                 // Debug message
581                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,encoded()=%d - CALLED!', __METHOD__, __LINE__, $groupId, $hash, strlen($encoded)));
582
583                 // Raw data been written to the file
584                 $rawData = sprintf('%s%s%s%s%s',
585                         $groupId,
586                         BaseBinaryFile::SEPARATOR_GROUP_HASH,
587                         hex2bin($hash),
588                         BaseBinaryFile::SEPARATOR_HASH_VALUE,
589                         $encoded
590                 );
591
592                 // Debug message
593                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,rawData()=%d', __METHOD__, __LINE__, $groupId, $hash, strlen($rawData)));
594
595                 // Search for next free gap
596                 $gapPosition = $this->getIteratorInstance()->searchNextGap(strlen($rawData));
597
598                 // Gap position cannot be smaller than header length + 1
599                 assert($gapPosition > $this->getIteratorInstance()->getHeaderSize());
600
601                 // Debug message
602                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,gapPosition=%s', __METHOD__, __LINE__, $groupId, $hash, $gapPosition));
603
604                 // Then write the data at that gap
605                 $this->getIteratorInstance()->writeData($gapPosition, $rawData);
606
607                 // Debug message
608                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,rawData()=%d - EXIT!', __METHOD__, __LINE__, $groupId, $hash, strlen($rawData)));
609
610                 // Return gap position, hash and length of raw data
611                 return array(
612                         self::ARRAY_INDEX_GAP_POSITION => $gapPosition,
613                         self::ARRAY_INDEX_HASH         => $hash,
614                         self::ARRAY_INDEX_DATA_LENGTH  => strlen($rawData)
615                 );
616         }
617
618 }