3 namespace Org\Mxchange\CoreFramework\Index\File;
5 // Import framework stuff
6 use Org\Mxchange\CoreFramework\EntryPoint\ApplicationEntryPoint;
7 use Org\Mxchange\CoreFramework\Factory\Object\ObjectFactory;
8 use Org\Mxchange\CoreFramework\Filesystem\File\BaseBinaryFile;
9 use Org\Mxchange\CoreFramework\Filesystem\File\BinaryFile;
10 use Org\Mxchange\CoreFramework\Index\BaseIndex;
11 use Org\Mxchange\CoreFramework\Index\Indexable;
12 use Org\Mxchange\CoreFramework\Utils\Arrays\ArrayUtils;
13 use Org\Mxchange\CoreFramework\Utils\Strings\StringUtils;
16 use \OutOfBoundsException;
18 use \UnexpectedValueException;
21 * A general file-based index class
23 * @author Roland Haeder <webmaster@ship-simu.org>
25 * @copyright Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2021 Core Developer Team
26 * @license GNU GPL 3.0 or any newer version
27 * @link http://www.ship-simu.org
29 * This program is free software: you can redistribute it and/or modify
30 * it under the terms of the GNU General Public License as published by
31 * the Free Software Foundation, either version 3 of the License, or
32 * (at your option) any later version.
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
39 * You should have received a copy of the GNU General Public License
40 * along with this program. If not, see <http://www.gnu.org/licenses/>.
42 abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
44 * Minimum block length
46 private static $minimumBlockLength = 0;
49 * Protected constructor
51 * @param $className Name of class
54 protected function __construct (string $className) {
55 // Call parent constructor
56 parent::__construct($className);
60 * Reads the file header
63 * @throws UnexpectedValueException If header length or count of elements is invalid
65 public function readIndexHeader () {
66 // First rewind to beginning as the header sits at the beginning ...
67 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
68 $this->getIteratorInstance()->rewind();
71 $headerSize = $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize();
73 // Then read it (see constructor for calculation)
74 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: headerSize=%d', $headerSize));
75 $data = $this->getIteratorInstance()->getBinaryFileInstance()->read($headerSize);
77 // Have all requested bytes been read?
78 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Read %d bytes (%d wanted).', strlen($data), $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()));
79 if (strlen($data) != $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()) {
80 // Invalid header length
81 throw new UnexpectedValueException(sprintf('data(%d)=%s is not expected length %d',
84 $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()
86 } elseif (empty(trim($data, chr(0)))) {
88 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: File header is empty - EXIT!');
90 } elseif (substr($data, -1, 1) != chr(BinaryFile::SEPARATOR_HEADER_ENTRIES)) {
92 throw new UnexpectedValueException(sprintf('data=%s does not end with "%s"',
94 chr(BinaryFile::SEPARATOR_HEADER_ENTRIES)
98 // Okay, then remove it
99 $data = substr($data, 0, -1);
101 // And update seek position
102 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->updateSeekPosition() ...');
103 $this->getIteratorInstance()->getBinaryFileInstance()->updateSeekPosition();
111 $header = explode(chr(BinaryFile::SEPARATOR_HEADER_DATA), $data);
113 // Map numeric entries to associative (alpha-numeric) elements
114 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: HEADER_INDEX_ELEMENT_COUNT=%d,header()=%d', BinaryFile::HEADER_INDEX_ELEMENT_COUNT, count($header)));
115 //* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: header(%d)=%s', count($header), print_r($header, true)));
116 $header = ArrayUtils::mapNumericKeysToAssociative($header, [
117 BinaryFile::HEADER_NAME_MAGIC,
118 BinaryFile::HEADER_NAME_TOTAL_ENTRIES,
121 // Check if the array has only 2 elements
122 if (count($header) != BinaryFile::HEADER_INDEX_ELEMENT_COUNT) {
124 throw new UnexpectedValueException(sprintf('header()=%d is not expected value %d', count($header), BinaryFile::HEADER_INDEX_ELEMENT_COUNT));
125 } elseif ($header[BinaryFile::HEADER_NAME_MAGIC] !== Indexable::INDEX_MAGIC) {
126 // Magic must be in first element
127 throw new UnexpectedValueException(sprintf('header[%s]=%s is not the expected magic (%s)', BinaryFile::HEADER_NAME_MAGIC, $header[BinaryFile::HEADER_NAME_MAGIC], Indexable::INDEX_MAGIC));
128 } elseif (strlen($header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES]) != BinaryFile::LENGTH_COUNT) {
129 // Length of total entries not matching
130 throw new UnexpectedValueException(sprintf('header[%s](%d)=%s does not have expected length %d', BinaryFile::HEADER_NAME_TOTAL_ENTRIES, strlen($header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES]), $header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES], BinaryFile::LENGTH_COUNT));
134 $header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES] = hex2bin($header[BinaryFile::HEADER_NAME_TOTAL_ENTRIES]);
137 $this->getIteratorInstance()->getBinaryFileInstance()->setHeader($header);
140 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: EXIT!');
144 * Flushes the file header
148 public function flushFileHeader () {
149 // Put all informations together
150 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
151 $header = sprintf('%s%s%s%s',
153 Indexable::INDEX_MAGIC,
155 // Separator header data
156 chr(BinaryFile::SEPARATOR_HEADER_DATA),
159 str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getBinaryFileInstance()->getCounter()), BinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
161 // Separator header<->entries
162 chr(BinaryFile::SEPARATOR_HEADER_ENTRIES)
165 // Write it to disk (header is always at seek position 0)
166 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->writeAtPosition(0, header=%s) ...', $header));
167 $this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition(0, $header);
170 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: EXIT!');
174 * Initializes this file-based index
176 * @param $fileInfoInstance An instance of a SplFileInfo class
178 * @todo Currently the index file is not cached, please implement a memory-handling class and if enough RAM is found, cache the whole index file.
180 protected function initFileIndex (SplFileInfo $fileInfoInstance) {
181 // Get a file i/o pointer instance for index file
182 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: fileInfoInstance[%s]=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance));
183 $fileInstance = ObjectFactory::createObjectByConfiguredName('index_file_class', array($fileInfoInstance, $this));
185 // Get iterator instance
186 $iteratorInstance = ObjectFactory::createObjectByConfiguredName('file_iterator_class', [$fileInstance]);
189 $this->setIteratorInstance($iteratorInstance);
191 // Calculate header size
193 strlen(Indexable::INDEX_MAGIC) +
194 strlen(chr(BinaryFile::SEPARATOR_HEADER_DATA)) +
195 BinaryFile::LENGTH_COUNT +
196 strlen(chr(BinaryFile::SEPARATOR_HEADER_ENTRIES))
200 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Setting headerSize=%d ...', $headerSize));
201 $this->getIteratorInstance()->getBinaryFileInstance()->setHeaderSize($headerSize);
203 // Init counters and gaps array
204 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->initCountersGapsArray() ...');
205 $this->getIteratorInstance()->getBinaryFileInstance()->initCountersGapsArray();
207 // Default is not created
210 // Is the file's header initialized?
211 if (!$this->getIteratorInstance()->getBinaryFileInstance()->isFileHeaderInitialized()) {
212 // First pre-allocate a bit
213 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->preAllocateFile(index) ...');
214 $this->getIteratorInstance()->getBinaryFileInstance()->preAllocateFile('index');
216 // Then write file header
217 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->createFileHeader() ...');
218 $this->getIteratorInstance()->getBinaryFileInstance()->createFileHeader();
220 // Mark as freshly created
224 // Load the file header
225 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->readIndexHeader() ...');
226 $this->readIndexHeader();
229 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: created=%d', intval($created)));
231 // Analyze file structure
232 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->analyzeFileStructure() ...');
233 $this->getIteratorInstance()->getBinaryFileInstance()->analyzeFileStructure();
237 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: EXIT!');
241 * Calculates minimum length for one entry/block
243 * @return $length Minimum length for one entry/block
245 public function calculateMinimumBlockLength () {
247 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
248 if (self::$minimumBlockLength == 0) {
250 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calculating ...');
251 self::$minimumBlockLength = (
253 BinaryFile::LENGTH_TYPE + strlen(chr(BinaryFile::SEPARATOR_TYPE_POSITION)) +
255 BinaryFile::LENGTH_POSITION + strlen(chr(BinaryFile::SEPARATOR_ENTRIES))
260 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: self::minimumBlockLength=%d - EXIT!', self::$minimumBlockLength));
261 return self::$minimumBlockLength;
265 * "Getter" for file size
267 * @return $fileSize Size of currently loaded file
269 public function getFileSize () {
270 // Call iterator's method
271 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
272 $fileSize = $this->getIteratorInstance()->getBinaryFileInstance()->getFileSize();
275 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: fileSize=%d - EXIT!', $fileSize));
280 * Searches for next suitable gap the given length of data can fit in
281 * including padding bytes.
283 * @param $length Length of raw data
284 * @return $seekPosition Found next gap's seek position
285 * @throws InvalidArgumentException If the parameter is not valid
286 * @todo Unfinished work
288 public function searchNextGap (int $length) {
289 // Validate parameter
290 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: length=%d - CALLED!', $length));
293 throw new InvalidArgumentException(sprintf('length=%d is not valid', $length));
297 /* DEBUG-DIE: */ ApplicationEntryPoint::exitApplication(sprintf('[%s:%d]: length=%d,this=%s', __METHOD__, __LINE__, $length, print_r($this, true)));
301 * Writes at given position by seeking to it.
303 * @param $seekPosition Seek position in file
304 * @param $dataStream Data to be written
305 * @return mixed Number of writes bytes or false on error
306 * @throws OutOfBoundsException If the position is not seekable
307 * @throws InvalidArgumentException If a parameter is not valid
309 public function writeAtPosition (int $seekPosition, string $dataStream) {
310 // Validate parameter
311 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: seekPosition=%d,dataStream(%d)=%s - CALLED!', $seekPosition, strlen($dataStream), $dataStream));
312 if ($seekPosition < 0) {
313 // Invalid seek position
314 throw new OutOfBoundsException(sprintf('seekPosition=%d is not valid.', $seekPosition));
315 } elseif (empty($dataStream)) {
317 throw new InvalidArgumentException('Parameter "dataStream" is empty');
320 // Call iterated object's method
321 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Calling this->iteratorInstance->binaryFileInstance->writeAtPosition(%d, %s) ...', $seekPosition, $dataStream));
322 $status = $this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition($seekPosition, $dataStream);
325 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: status[%s]=%d - EXIT!', gettype($status), $status));
330 * Checks if this index has been fully and properly loaded.
332 * @return $isLoaded Whether this index has been loaded
334 public function isIndexLoaded () {
335 // Is the file gaps-only?
336 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
337 if ($this->getIteratorInstance()->getBinaryFileInstance()->isFileGapsOnly()) {
338 // Then skip below code as this implies the file has been fully analyzed and "loaded"
339 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Underlaying file is gaps-only: Returning TRUE ... - EXIT!');
344 /* DEBUG-DIE: */ ApplicationEntryPoint::exitApplication(sprintf('[%s:%d]: this=%s', __METHOD__, __LINE__, print_r($this, true)));