framework/main/classes/file_directories/binary/index/class_IndexFile.php

   1 <?php
   2 // Own namespace
   3 namespace Org\Mxchange\CoreFramework\Filesystem\Index;
   4
   5 // Import framework stuff
   6 use Org\Mxchange\CoreFramework\Bootstrap\FrameworkBootstrap;
   7 use Org\Mxchange\CoreFramework\Filesystem\File\BaseBinaryFile;
   8 use Org\Mxchange\CoreFramework\Filesystem\Index\IndexableFile;
   9 use Org\Mxchange\CoreFramework\Generic\UnsupportedOperationException;
  10 use Org\Mxchange\CoreFramework\Index\Indexable;
  11 use Org\Mxchange\CoreFramework\Utils\Crypto\CryptoUtils;
  12
  13 // Import SPL stuff
  14 use \BadMethodCallException;
  15 use \InvalidArgumentException;
  16 use \SplFileInfo;
  17
  18 /**
  19  * An index file class
  20  *
  21  * @author              Roland Haeder <webmaster@ship-simu.org>
  22  * @version             0.0.0
  23  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2021 Core Developer Team
  24  * @license             GNU GPL 3.0 or any newer version
  25  * @link                http://www.ship-simu.org
  26  *
  27  * This program is free software: you can redistribute it and/or modify
  28  * it under the terms of the GNU General Public License as published by
  29  * the Free Software Foundation, either version 3 of the License, or
  30  * (at your option) any later version.
  31  *
  32  * This program is distributed in the hope that it will be useful,
  33  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  34  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  35  * GNU General Public License for more details.
  36  *
  37  * You should have received a copy of the GNU General Public License
  38  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  39  */
  40 class IndexFile extends BaseBinaryFile implements IndexableFile {
  41         /**
  42          * Protected constructor
  43          *
  44          * @return      void
  45          */
  46         private function __construct () {
  47                 // Call parent constructor
  48                 parent::__construct(__CLASS__);
  49         }
  50
  51         /**
  52          * Creates an instance of this File class and prepares it for usage
  53          *
  54          * @param       $fileInfoInstance       An instance of a SplFileInfo class
  55          * @param       $indexInstance  An instance of a Indexable class
  56          * @return      $indexFileInstance      An instance of an IndexableFile class
  57          */
  58         public final static function createIndexFile (SplFileInfo $fileInfoInstance, Indexable $indexInstance) {
  59                 // Get a new instance
  60                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: fileInfoInstance[%s]=%s,indexInstance=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance, $indexInstance->__toString()));
  61                 $indexFileInstance = new IndexFile();
  62
  63                 // Set file instance here for callbacks
  64                 $indexFileInstance->setIndexInstance($indexInstance);
  65
  66                 // Expand file name with .idx
  67                 $indexInfoInstance = new SplFileInfo(sprintf('%s.idx', $fileInfoInstance->__toString()));
  68
  69                 // Init this abstract file
  70                 $indexFileInstance->initFile($indexInfoInstance);
  71
  72                 // Init counters and gaps array
  73                 $indexFileInstance->initCountersGapsArray();
  74
  75                 // Return the prepared instance
  76                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: indexFileInstance=%s - EXIT!', $indexFileInstance->__toString()));
  77                 return $indexFileInstance;
  78         }
  79
  80         /**
  81          * Flushes the file header
  82          *
  83          * @return      void
  84          * @throws      BadMethodCallException  If this->indexInstance is not properly set
  85          */
  86         public function flushFileHeader () {
  87                 // Validate call
  88                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: CALLED!');
  89                 if (!($this->getIndexInstance() instanceof Indexable)) {
  90                         // Index instance not set
  91                         throw new BadMethodCallException('this->indexInstance[] is not properly set.');
  92                 }
  93
  94                 // Call block instance
  95                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Calling this->indexInstance->flushFileHeader() ...');
  96                 $this->getIndexInstance()->flushFileHeader();
  97
  98                 // Trace message
  99                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: EXIT!');
 100         }
 101
 102         /**
 103          * Pre-allocates file (if enabled) with some space for later faster write access.
 104          *
 105          * @param       $type   Type of the file
 106          * @return      void
 107          * @throws      InvalidArgumentException        If a parameter is empty
 108          * @throws      BadMethodCallException  If this->indexInstance is not properly set
 109          */
 110         public function preAllocateFile (string $type) {
 111                 // Is it enabled?
 112                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: type=%s - CALLED!', $type));
 113                 if (empty($type)) {
 114                         // Empty type
 115                         throw new InvalidArgumentException('Parameter "type" is empty');
 116                 } elseif (!($this->getIndexInstance() instanceof Indexable)) {
 117                         // Index instance not set
 118                         throw new BadMethodCallException('this->indexInstance[] is not properly set.');
 119                 }
 120
 121                 // Message to user
 122                 self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Pre-allocating file ...');
 123
 124                 // Calculate minimum block length
 125                 $minimumBlockLength = $this->getIndexInstance()->calculateMinimumBlockLength();
 126
 127                 // Call protected method
 128                 $this->preAllocateFileByTypeLength($type, $minimumBlockLength);
 129
 130                 // Trace message
 131                 //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: EXIT!');
 132         }
 133
 134         /**
 135          * Checks wether the current entry is valid (not at the end of the file).
 136          * This method will return true if an emptied (nulled) entry has been found.
 137          *
 138          * @return      $isValid        Whether the next entry is valid
 139          * @throws      UnexpectedValueException        If some value is not expected
 140          * @throws      BadMethodCallException  If this->indexInstance is not properly set
 141          */
 142         public function isValid () {
 143                 // Validate call
 144                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: CALLED!');
 145                 if (!($this->getIndexInstance() instanceof Indexable)) {
 146                         // Index instance not set
 147                         throw new BadMethodCallException('this->indexInstance[] is not properly set.');
 148                 }
 149
 150                 // Get length from index
 151                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: Calling this->indexInstance->calculateMinimumBlockLength() ...');
 152                 $length = $this->getIndexInstance()->calculateMinimumBlockLength();
 153
 154                 // Call protected method
 155                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: Calling this->isValidByLength(%d) ...', $length));
 156                 $isValid = $this->isValidByLength($length);
 157
 158                 // Return result
 159                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: isValid=%d - EXIT!', intval($isValid)));
 160                 return $isValid;
 161         }
 162
 163         /**
 164          * Writes given value to the file and returns a hash and gap position for it
 165          *
 166          * @param       $stackName      Group identifier
 167          * @param       $value          Value to be added to the stack
 168          * @return      $data           Hash and gap position
 169          * @throws      InvalidArgumentException        If a parameter is not valid
 170          * @throws      BadMethodCallException  If this->indexInstance is not properly set
 171          */
 172         public function writeValueToFile (string $stackName, $value) {
 173                 // Validate parameter
 174                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: stackName=%s,value[]=%s - CALLED!', $stackName, gettype($value)));
 175                 if (empty($stackName)) {
 176                         // Throw IAE
 177                         throw new InvalidArgumentException('Parameter "stackName" is empty');
 178                 } elseif (is_object($value) || is_resource($value)) {
 179                         // Not wanted here
 180                         throw new InvalidArgumentException(sprintf('value[]=%s is not stackable in files', gettype($value)));
 181                 } elseif (!($this->getIndexInstance() instanceof Indexable)) {
 182                         // Index instance not set
 183                         throw new BadMethodCallException('this->indexInstance[] is not properly set.');
 184                 }
 185
 186                 // Encode/convert the value into a "binary format"
 187                 $encoded = StringUtils::encodeData($value);
 188
 189                 // Get a strong hash for the "encoded" data
 190                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: encoded=%s', $encoded));
 191                 $hash = CryptoUtils::hash($encoded);
 192
 193                 // Then write it to the next free gap
 194                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: hash=%s', $hash));
 195                 $data = $this->getIndexInstance()->writeDataToFreeGap($stackName, $hash, $encoded);
 196
 197                 // Return info
 198                 /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('INDEX-FILE: data[]=%s - EXIT!', gettype($data)));
 199                 return $data;
 200         }
 201
 202         /**
 203          * Writes given raw data to the file and returns a gap position and length
 204          *
 205          * @param       $stackName      Group identifier
 206          * @param       $hash           Hash from encoded value
 207          * @param       $encoded        Encoded value to be written to the file
 208          * @return      $data           Gap position and length of the raw data
 209          * @throws      UnsupportedOperationException   If this method is called
 210          */
 211         public function writeDataToFreeGap (string $stackName, string $hash, string $encoded) {
 212                 self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('INDEX-FILE: stackName=' . $stackName . ',hash=' . $hash . ',encoded()=' . strlen($encoded));
 213                 throw new UnsupportedOperationException(array($this, __FUNCTION__), self::EXCEPTION_UNSPPORTED_OPERATION);
 214         }
 215
 216 }