From: Roland Häder <roland@mxchange.org>
Date: Thu, 7 Jan 2021 20:18:27 +0000 (+0100)
Subject: Continued:
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=deb07dbc679f4cc7fe0e84eeb352f87f21ccf0aa;p=core.git

Continued:
- removed SeekableWritableFileIterator as this had no real function but only
  handled over the method calls to the inner class
- for now on let's get the $binaryFileInstance directly from it

Signed-off-by: Roland Häder <roland@mxchange.org>
---

diff --git a/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php b/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php
index ac37fd24..d2adfe87 100644
--- a/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php
+++ b/framework/main/classes/file_directories/binary/class_BaseBinaryFile.php
@@ -919,11 +919,11 @@ abstract class BaseBinaryFile extends BaseAbstractFile implements BinaryFile {
 
 		// Left part is the actual block, right one the back-buffer data, if found
 		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: dataArray()=%d', count($dataArray)));
-		//* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: dataArray=%s', print_r($dataArray, true)));
+		/* PRINTR-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: dataArray=%s', print_r($dataArray, true)));
 		$this->setCurrentBlock($dataArray[0]);
 
 		// Is back buffere data found?
-		if (!empty(trim($dataArray[1], chr(0)))) {
+		if (isset($dataArray[1]) && !empty(trim($dataArray[1], chr(0)))) {
 			// Set back buffer
 			//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-BINARY-FILE: Setting this->backBuffer=%s ...', $dataArray[1]));
 			$this->setBackBuffer($dataArray[1]);
diff --git a/framework/main/classes/index/class_BaseIndex.php b/framework/main/classes/index/class_BaseIndex.php
index 7ee704ce..e0e68beb 100644
--- a/framework/main/classes/index/class_BaseIndex.php
+++ b/framework/main/classes/index/class_BaseIndex.php
@@ -7,7 +7,6 @@ use Org\Mxchange\CoreFramework\EntryPoint\ApplicationEntryPoint;
 use Org\Mxchange\CoreFramework\Factory\Object\ObjectFactory;
 use Org\Mxchange\CoreFramework\Filesystem\File\BaseBinaryFile;
 use Org\Mxchange\CoreFramework\Generic\UnsupportedOperationException;
-use Org\Mxchange\CoreFramework\Iterator\Filesystem\SeekableWritableFileIterator;
 use Org\Mxchange\CoreFramework\Object\BaseFrameworkSystem;
 use Org\Mxchange\CoreFramework\Utils\String\StringUtils;
 use Org\Mxchange\CoreFramework\Traits\Iterator\IteratorTrait;
diff --git a/framework/main/classes/index/file/class_BaseFileIndex.php b/framework/main/classes/index/file/class_BaseFileIndex.php
index e25f37b2..d8f697a3 100644
--- a/framework/main/classes/index/file/class_BaseFileIndex.php
+++ b/framework/main/classes/index/file/class_BaseFileIndex.php
@@ -65,17 +65,21 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
 		$this->getIteratorInstance()->rewind();
 
+		// Get header size
+		$headerSize = $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize();
+
 		// Then read it (see constructor for calculation)
-		$data = $this->getIteratorInstance()->read($this->getIteratorInstance()->getHeaderSize());
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: headerSize=%d', $headerSize));
+		$data = $this->getIteratorInstance()->getBinaryFileInstance()->read($headerSize);
 
 		// Have all requested bytes been read?
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Read %d bytes (%d wanted).', strlen($data), $this->getIteratorInstance()->getHeaderSize()));
-		if (strlen($data) != $this->getIteratorInstance()->getHeaderSize()) {
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Read %d bytes (%d wanted).', strlen($data), $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()));
+		if (strlen($data) != $this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()) {
 			// Invalid header length
 			throw new UnexpectedValueException(sprintf('data(%d)=%s is not expected length %d',
 				strlen($data),
 				$data,
-				$this->getIteratorInstance()->getHeaderSize()
+				$this->getIteratorInstance()->getBinaryFileInstance()->getHeaderSize()
 			));
 		} elseif (empty(trim($data, chr(0)))) {
 			// Empty file header
@@ -94,7 +98,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 
 		// And update seek position
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->updateSeekPosition() ...');
-		$this->getIteratorInstance()->updateSeekPosition();
+		$this->getIteratorInstance()->getBinaryFileInstance()->updateSeekPosition();
 
 		/*
 		 * Now split it:
@@ -122,7 +126,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		$header[1] = hex2bin($header[1]);
 
 		// Set it here
-		$this->getIteratorInstance()->setHeader($header);
+		$this->getIteratorInstance()->getBinaryFileInstance()->setHeader($header);
 
 		// Trace message
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: EXIT!');
@@ -144,7 +148,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 			chr(BaseBinaryFile::SEPARATOR_HEADER_DATA),
 
 			// Total entries
-			str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getCounter()), BaseBinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
+			str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getBinaryFileInstance()->getCounter()), BaseBinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
 
 			// Separator header<->entries
 			chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES)
@@ -152,20 +156,20 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 
 		// Write it to disk (header is always at seek position 0)
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Calling this->iteratorInstance->writeAtPosition(0, header=%s) ...', $header));
-		$this->getIteratorInstance()->writeAtPosition(0, $header);
+		$this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition(0, $header);
 
 		// Trace message
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: EXIT!');
 	}
 
 	/**
-	 * Initializes this index
+	 * Initializes this file-based index
 	 *
 	 * @param	$fileInfoInstance	An instance of a SplFileInfo class
 	 * @return	void
 	 * @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.
 	 */
-	protected function initIndex (SplFileInfo $fileInfoInstance) {
+	protected function initFileIndex (SplFileInfo $fileInfoInstance) {
 		// Get a file i/o pointer instance for index file
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: fileInfoInstance[%s]=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance));
 		$fileInstance = ObjectFactory::createObjectByConfiguredName('index_file_class', array($fileInfoInstance, $this));
@@ -186,24 +190,24 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 
 		// Set it
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Setting headerSize=%d ...', $headerSize));
-		$this->getIteratorInstance()->setHeaderSize($headerSize);
+		$this->getIteratorInstance()->getBinaryFileInstance()->setHeaderSize($headerSize);
 
 		// Init counters and gaps array
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->initCountersGapsArray() ...');
-		$this->getIteratorInstance()->initCountersGapsArray();
+		$this->getIteratorInstance()->getBinaryFileInstance()->initCountersGapsArray();
 
 		// Default is not created
 		$created = false;
 
 		// Is the file's header initialized?
-		if (!$this->getIteratorInstance()->isFileHeaderInitialized()) {
+		if (!$this->getIteratorInstance()->getBinaryFileInstance()->isFileHeaderInitialized()) {
 			// First pre-allocate a bit
 			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->preAllocateFile(index) ...');
-			$this->getIteratorInstance()->preAllocateFile('index');
+			$this->getIteratorInstance()->getBinaryFileInstance()->preAllocateFile('index');
 
 			// Then write file header
 			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->createFileHeader() ...');
-			$this->getIteratorInstance()->createFileHeader();
+			$this->getIteratorInstance()->getBinaryFileInstance()->createFileHeader();
 
 			// Mark as freshly created
 			$created = true;
@@ -218,7 +222,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 		if (!$created) {
 			// Analyze file structure
 			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Calling this->iteratorInstance->analyzeFileStructure() ...');
-			$this->getIteratorInstance()->analyzeFileStructure();
+			$this->getIteratorInstance()->getBinaryFileInstance()->analyzeFileStructure();
 		}
 
 		// Trace message
@@ -256,7 +260,12 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 	 */
 	public function getFileSize () {
 		// Call iterator's method
-		return $this->getIteratorInstance()->getFileSize();
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
+		$fileSize = $this->getIteratorInstance()->getBinaryFileInstance()->getFileSize();
+
+		// Return it
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: fileSize=%d - EXIT!', $fileSize));
+		return $fileSize;
 	}
 
 	/**
@@ -276,8 +285,8 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 			throw new InvalidArgumentException(sprintf('length=%d is not valid', $length));
 		}
 
-		// Partial stub!
-		$this->partialStub('length=' . $length);
+		// Debug message
+		/* DEBUG-DIE: */ ApplicationEntryPoint::exitApplication(sprintf('[%s:%d]: length=%d,this=%s', __METHOD__, __LINE__, $length, print_r($this, true)));
 	}
 
 	/**
@@ -302,7 +311,7 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 
 		// Call iterated object's method
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: Calling this->iteratorInstance->writeAtPosition(%d, %s) ...', $seekPosition, $dataStream));
-		$status = $this->getIteratorInstance()->writeAtPosition($seekPosition, $dataStream);
+		$status = $this->getIteratorInstance()->getBinaryFileInstance()->writeAtPosition($seekPosition, $dataStream);
 
 		// Return status
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-INDEX: status[%s]=%d - EXIT!', gettype($status), $status));
@@ -316,10 +325,10 @@ abstract class BaseFileIndex extends BaseIndex implements FileIndexer {
 	 */
 	public function isIndexLoaded () {
 		// Is the file gaps-only?
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-INDEX: CALLED!');
-		if ($this->getIteratorInstance()->isFileGapsOnly()) {
+		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: CALLED!');
+		if ($this->getIteratorInstance()->getBinaryFileInstance()->isFileGapsOnly()) {
 			// Then skip below code as this implies the file has been fully analyzed and "loaded"
-			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-INDEX: Underlaying file is gaps-only: Returning TRUE ... - EXIT!');
+			/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-INDEX: Underlaying file is gaps-only: Returning TRUE ... - EXIT!');
 			return TRUE;
 		}
 
diff --git a/framework/main/classes/index/file/stack/class_FileStackIndex.php b/framework/main/classes/index/file/stack/class_FileStackIndex.php
index 21d1e6a9..e74177ab 100644
--- a/framework/main/classes/index/file/stack/class_FileStackIndex.php
+++ b/framework/main/classes/index/file/stack/class_FileStackIndex.php
@@ -59,7 +59,7 @@ class FileStackIndex extends BaseFileIndex implements IndexableStack, Registerab
 		$indexInstance = new FileStackIndex();
 
 		// Initialize index
-		$indexInstance->initIndex($fileInfoInstance);
+		$indexInstance->initFileIndex($fileInfoInstance);
 
 		// Return the prepared instance
 		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-STACK-INDEX: indexInstance=%s - EXIT!', $indexInstance->__toString()));
diff --git a/framework/main/classes/iterator/file/class_FileIterator.php b/framework/main/classes/iterator/file/class_FileIterator.php
index f3352326..e820af7c 100644
--- a/framework/main/classes/iterator/file/class_FileIterator.php
+++ b/framework/main/classes/iterator/file/class_FileIterator.php
@@ -5,13 +5,13 @@ namespace Org\Mxchange\CoreFramework\Iterator\File;
 // Import framework stuff
 use Org\Mxchange\CoreFramework\Filesystem\File\BinaryFile;
 use Org\Mxchange\CoreFramework\Iterator\BaseIterator;
-use Org\Mxchange\CoreFramework\Iterator\Filesystem\SeekableWritableFileIterator;
 use Org\Mxchange\CoreFramework\Traits\File\BinaryFileTrait;
 
 // Import SPL stuff
 use \BadMethodCallException;
 use \InvalidArgumentException;
 use \OutOfBoundsException;
+use \SeekableIterator;
 
 /**
  * A file iterator
@@ -35,7 +35,7 @@ use \OutOfBoundsException;
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-class FileIterator extends BaseIterator implements SeekableWritableFileIterator {
+class FileIterator extends BaseIterator implements SeekableIterator {
 	// Load traits
 	use BinaryFileTrait;
 
@@ -160,11 +160,10 @@ class FileIterator extends BaseIterator implements SeekableWritableFileIterator
 	 * Seeks to given position
 	 *
 	 * @param	$seekPosition	Seek position in file
-	 * @param	$whence			Added to offset (default: only use offset to seek to)
-	 * @return	$status			Status of this operation
+	 * @return	void
 	 * @throws	OutOfBoundsException	If the position is not seekable
 	 */
-	public function seek (int $seekPosition, int $whence = SEEK_SET) {
+	public function seek (int $seekPosition) {
 		// Validate parameter
 		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: seekPosition=%d,whence=%d - CALLED!', $seekPosition, $whence));
 		if ($seekPosition < 0) {
@@ -173,398 +172,10 @@ class FileIterator extends BaseIterator implements SeekableWritableFileIterator
 		}
 
 		// Call file instance
-		$status = $this->getBinaryFileInstance()->seek($seekPosition, $whence);
-
-		// Return status
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: status=%d - EXIT!', intval($status)));
-		return $status;
-	}
-
-	/**
-	 * Size of file stack
-	 *
-	 * @return	$size	Size (in bytes) of file
-	 */
-	public function size () {
-		// Call the file object
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$size = $this->getBinaryFileInstance()->size();
-
-		// Return size
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: size=%d - EXIT!', $size));
-		return $size;
-	}
-
-	/**
-	 * Reads given amount of bytes from file.
-	 *
-	 * @param	$bytes	Amount of bytes to read
-	 * @return	$data	Data read from file
-	 * @throws	OutOfBoundsException	If the position is not seekable
-	 */
-	public function read (int $bytes = 0) {
-		// Validate parameter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: bytes=%d - CALLED!', $bytes));
-		if ($bytes < 0) {
-			// Throw exception
-			throw new OutOfBoundsException(sprintf('bytes=%d is not valid', $bytes));
-		}
-
-		// Call file instance
-		$data = $this->getBinaryFileInstance()->read($bytes);
-
-		// Return data
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: data[]=%s - EXIT!', gettype($data)));
-		return $data;
-	}
-
-	/**
-	 * Analyzes entries in index file. This will count all found (and valid)
-	 * entries, mark invalid as damaged and count gaps ("fragmentation"). If
-	 * only gaps are found, the file is considered as "virgin" (no entries).
-	 *
-	 * @return	void
-	 */
-	public function analyzeFileStructure () {
-		// Just call the file instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$this->getBinaryFileInstance()->analyzeFileStructure();
-
-		// Trace message
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
-	}
-
-	/**
-	 * Checks whether the file header is initialized
-	 *
-	 * @return	$isInitialized	Whether the file header is initialized
-	 */
-	public function isFileHeaderInitialized () {
-		// Just call the file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$isInitialized = $this->getBinaryFileInstance()->isFileHeaderInitialized();
-
-		// Return flag
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: isInitialized=%d - EXIT!', intval($isInitialized)));
-		return $isInitialized;
-	}
-
-	/**
-	 * Creates the assigned file
-	 *
-	 * @return	void
-	 */
-	public function createFileHeader () {
-		// Just call the file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$this->getBinaryFileInstance()->createFileHeader();
-
-		// Trace message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
-	}
-
-	/**
-	 * Pre-allocates file (if enabled) with some space for later faster write access.
-	 *
-	 * @param	$type	Type of the file
-	 * @return	void
-	 * @throws	InvalidArgumentException	If a parameter is not valid
-	 */
-	public function preAllocateFile (string $type) {
-		// Validate parameter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: type=%s - CALLED!', $type));
-		if (empty($type)) {
-			// Throw IAE
-			throw new InvalidArgumentException('Parameter "type" is empty');
-		}
-
-		// Just call the file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: Calling this->binaryFileInstance->preAllocateFile(%s) ...', $type));
-		$this->getBinaryFileInstance()->preAllocateFile($type);
-
-		// Trace message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
-	}
-
-	/**
-	 * Initializes counter for valid entries, arrays for damaged entries and
-	 * an array for gap seek positions. If you call this method on your own,
-	 * please re-analyze the file structure. So you are better to call
-	 * analyzeFileStructure() instead of this method.
-	 *
-	 * @return	void
-	 */
-	public function initCountersGapsArray () {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$this->getBinaryFileInstance()->initCountersGapsArray();
-
-		// Trace message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
-	}
-
-	/**
-	 * Getter for header size
-	 *
-	 * @return	$totalEntries	Size of file header
-	 */
-	public final function getHeaderSize () {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$size = $this->getBinaryFileInstance()->getHeaderSize();
-
-		// Return size
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: size=%d - EXIT!', $size));
-		return $size;
-	}
-
-	/**
-	 * Setter for header size
-	 *
-	 * @param	$headerSize		Size of file header
-	 * @return	void
-	 */
-	public final function setHeaderSize (int $headerSize) {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: headerSize=%d - CALLED!', $headerSize));
-		$this->getBinaryFileInstance()->setHeaderSize($headerSize);
-
-		// Trace message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
-	}
-
-	/**
-	 * Getter for header array
-	 *
-	 * @return	$header		Header array
-	 */
-	public final function getHeader () {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$header = $this->getBinaryFileInstance()->getHeader();
-
-		// Return it
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: header()=%d - EXIT!', count($header)));
-		return $header;
-	}
-
-	/**
-	 * Setter for header
-	 *
-	 * @param	$header		Array for a file header
-	 * @return	void
-	 */
-	public final function setHeader (array $header) {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: header()=%d - CALLED!', count($header)));
-		$this->getBinaryFileInstance()->setHeader($header);
-
-		// Trace message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
-	}
-
-	/**
-	 * Updates seekPosition attribute from file to avoid to much access on file.
-	 *
-	 * @return	void
-	 */
-	public function updateSeekPosition () {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$this->getBinaryFileInstance()->updateSeekPosition();
-
-		// Trace message
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
-	}
-
-	/**
-	 * Getter for total entries
-	 *
-	 * @return	$totalEntries	Total entries in this file
-	 */
-	public final function getCounter () {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$counter = $this->getBinaryFileInstance()->getCounter();
-
-		// Return counter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: counter=%d - EXIT!', $counter));
-		return $counter;
-	}
-
-	/**
-	 * "Getter" for file size
-	 *
-	 * @return	$fileSize	Size of currently loaded file
-	 */
-	public function getFileSize () {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$size = $this->getBinaryFileInstance()->getFileSize();
-
-		// Return size
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: size=%d - EXIT!', $size));
-		return $size;
-	}
-
-	/**
-	 * Writes data at given position
-	 *
-	 * @param	$seekPosition	Seek position
-	 * @param	$data			Data to be written
-	 * @param	$flushHeader	Whether to flush the header (default: flush)
-	 * @return	void
-	 * @throws	OutOfBoundsException	If the position is not seekable
-	 * @throws	InvalidArgumentException	If a parameter is not valid
-	 */
-	public function writeData (int $seekPosition, string $data, bool $flushHeader = true) {
-		// Validate parameter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: seekPosition=%d,data(%d)=%s,flushHeader=%d - CALLED!', $seekPosition, strlen($data), $data, intval($flushHeader)));
-		if ($seekPosition < 0) {
-			// Throw exception
-			throw new OutOfBoundsException(sprintf('seekPosition=%d is not valid', $seekPosition));
-		} elseif (empty($data)) {
-			// Throw IAE
-			throw new InvalidArgumentException('Parameter "data" is empty');
-		}
-
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: Calling this->binaryFileInstance->writeData(%d,data()=%d,%d) ...', $seekPosition, strlen($data), intval($flushHeader)));
-		$this->getBinaryFileInstance()->writeData($seekPosition, $data, $flushHeader);
+		$this->getBinaryFileInstance()->seek($seekPosition);
 
 		// Trace message
 		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: EXIT!');
 	}
 
-	/**
-	 * Writes at given position by seeking to it.
-	 *
-	 * @param	$seekPosition	Seek position in file
-	 * @param	$dataStream		Data to be written
-	 * @return	mixed			Number of writes bytes or false on error
-	 * @throws	OutOfBoundsException	If the position is not seekable
-	 * @throws	InvalidArgumentException	If a parameter is not valid
-	 */
-	public function writeAtPosition (int $seekPosition, string $dataStream) {
-		// Validate parameter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: seekPosition=%d,dataStream(%d)=%s - CALLED!', $seekPosition, strlen($dataStream), $dataStream));
-		if ($seekPosition < 0) {
-			// Invalid seek position
-			throw new OutOfBoundsException(sprintf('seekPosition=%d is not valid.', $seekPosition));
-		} elseif (empty($dataStream)) {
-			// Empty dataStream
-			throw new InvalidArgumentException('Parameter "dataStream" is empty');
-		}
-
-		// Call iterated object's method
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: Calling this->binaryFileInstance->writeAtPosition(%d, %s) ...', $seekPosition, $dataStream));
-		$status = $this->getBinaryFileInstance()->writeAtPosition($seekPosition, $dataStream);
-
-		// Return status
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: status[%s]=%d - EXIT!', gettype($status), $status));
-		return $status;
-	}
-
-	/**
-	 * Getter for seek position
-	 *
-	 * @return	$seekPosition	Current seek position (stored here in object)
-	 */
-	public function getSeekPosition () {
-		// Call file instance
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$seekPosition = $this->getBinaryFileInstance()->getSeekPosition();
-
-		// Return position
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: seekPosition[%s]=%d - EXIT!', gettype($seekPosition), $seekPosition));
-		return $seekPosition;
-	}
-
-	/**
-	 * Writes given value to the file and returns a hash and gap position for it
-	 *
-	 * @param	$stackName	Group identifier
-	 * @param	$value		Value to be added to the stack
-	 * @return	$data		Hash and gap position
-	 * @throws	InvalidArgumentException	If a parameter is not valid
-	 */
-	public function writeValueToFile (string $stackName, $value) {
-		// Validate parameter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: stackName=%s,value[]=%s - CALLED!', $stackName, gettype($value)));
-		if (empty($stackName)) {
-			// Throw IAE
-			throw new InvalidArgumentException('Parameter "stackName" is empty');
-		} elseif (is_resource($value) || is_object($value)) {
-			// Resources and objects are nothing for file-based indexes (mostly)
-			throw new InvalidArgumentException(sprintf('value[]=%s is not supported by file-based indexes', gettype($value)));
-		}
-
-		// Call file instance
-		$data = $this->getBinaryFileInstance()->writeValueToFile($stackName, $value);
-
-		// Return data
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: data[]=%s - EXIT!', gettype($data)));
-		return $data;
-	}
-
-	/**
-	 * Writes given raw data to the file and returns a gap position and length
-	 *
-	 * @param	$stackName	Group identifier
-	 * @param	$hash		Hash from encoded value
-	 * @param	$encoded	Encoded value to be written to the file
-	 * @return	$data		Gap position and length of the raw data
-	 */
-	public function writeDataToFreeGap (string $stackName, string $hash, string $encoded) {
-		// Validate parameter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: stackName=%s,hash=%s,encoded(%d)=%s - CALLED!', $stackName, $hash, strlen($encoded), $encoded));
-
-		// Call file instance
-		$data = $this->getBinaryFileInstance()->writeDataToFreeGap($stackName, $hash, $encoded);
-
-		// Return data
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: data[]=%s - EXIT!', gettype($data)));
-		return $data;
-	}
-
-	/**
-	 * Searches for next suitable gap the given length of data can fit in
-	 * including padding bytes.
-	 *
-	 * @param	$length			Length of raw data
-	 * @return	$seekPosition	Found next gap's seek position
-	 * @throws	InvalidArgumentException	If a parameter is invalid
-	 */
-	public function searchNextGap (int $length) {
-		// Validate parameter
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: length=%d - CALLED!', $length));
-		if ($length <= 0) {
-			// Throw IAE
-			throw new InvalidArgumentException(sprintf('length=%d is not valid', $length));
-		}
-
-		// Call file instance
-		$seekPosition = $this->getBinaryFileInstance()->searchNextGap($length);
-
-		// Return position
-		//* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: seekPosition[%s]=%d - EXIT!', gettype($seekPosition), $seekPosition));
-		return $seekPosition;
-	}
-
-	/**
-	 * Checks whether the abstracted file only contains gaps by counting all
-	 * gaps' bytes together and compare it to total length.
-	 *
-	 * @return	$isGapsOnly		Whether the abstracted file only contains gaps
-	 */
-	public function isFileGapsOnly () {
-		// Call file instance
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('FILE-ITERATOR: CALLED!');
-		$isGapsOnly = $this->getBinaryFileInstance()->isFileGapsOnly();
-
-		// Return position
-		/* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('FILE-ITERATOR: isGapsOnly=%d - EXIT!', $isGapsOnly));
-		return $isGapsOnly;
-	}
-
 }
diff --git a/framework/main/classes/resolver/command/class_BaseCommandResolver.php b/framework/main/classes/resolver/command/class_BaseCommandResolver.php
index dc6ba713..c18046bf 100644
--- a/framework/main/classes/resolver/command/class_BaseCommandResolver.php
+++ b/framework/main/classes/resolver/command/class_BaseCommandResolver.php
@@ -81,7 +81,7 @@ abstract class BaseCommandResolver extends BaseResolver {
 	 * @throws	InvalidCommandException		Thrown if even the default
 	 *										command class is missing (bad!)
 	 */
-	protected function loadCommand ($commandName) {
+	protected function loadCommand (string $commandName) {
 		// Init command instance
 		$commandInstance = NULL;
 
diff --git a/framework/main/classes/resolver/controller/class_BaseControllerResolver.php b/framework/main/classes/resolver/controller/class_BaseControllerResolver.php
index b2f4e7c0..2d3669aa 100644
--- a/framework/main/classes/resolver/controller/class_BaseControllerResolver.php
+++ b/framework/main/classes/resolver/controller/class_BaseControllerResolver.php
@@ -116,13 +116,13 @@ abstract class BaseControllerResolver extends BaseResolver {
 			// No news at main controller or non-news controller
 			$this->setClassName($className);
 		}
-		//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('AFTER: controller=' . $this->getClassName());
 
 		// Is this class loaded?
+		//* DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('AFTER: controller=' . $this->getClassName());
 		if (!class_exists($this->getClassName())) {
 			// Throw an exception here
 			throw new InvalidControllerException(array($this, $controllerName), self::EXCEPTION_INVALID_CONTROLLER);
-		} // END - if
+		}
 
 		// Try to read a config entry for our resolver including controller name... ;-)
 		$resolverConfigEntry = sprintf('%s_cmd_%s_resolver_class', strtolower($this->getClassPrefix()), strtolower($controllerName));
@@ -159,7 +159,7 @@ abstract class BaseControllerResolver extends BaseResolver {
 	 * @throws	InvalidArgumentException		Thrown if given controller is not set
 	 * @throws	DefaultControllerException	Thrown if default controller was not found
 	 */
-	protected function isControllerValid ($namespace, $controllerName) {
+	protected function isControllerValid (string $namespace, string $controllerName) {
 		// Is a action set?
 		if (empty($namespace)) {
 			// Then thrown an exception here
@@ -174,16 +174,19 @@ abstract class BaseControllerResolver extends BaseResolver {
 
 		// Create class name
 		$className = sprintf(
-			'%s\%sController',
+			'%s\%s%sController',
 			$namespace,
-			$this->getCapitalizedClassPrefix() . StringUtils::convertToClassName($controllerName)
+			$this->getCapitalizedClassPrefix(),
+			StringUtils::convertToClassName($controllerName)
 		);
+
 		// Application's default news controller
 		$appDefaultControllerName = sprintf(
 			'%s\%sDefaultNewsController',
 			$namespace,
 			$this->getCapitalizedClassPrefix()
 		);
+
 		// Framework's default news controller
 		$defaultControllerName = sprintf(
 			'Org\Mxchange\CoreFramework\Controller\News\%sDefaultNewsController',
diff --git a/framework/main/classes/resolver/controller/console/class_ConsoleControllerResolver.php b/framework/main/classes/resolver/controller/console/class_ConsoleControllerResolver.php
index d88c45d6..dc2ee291 100644
--- a/framework/main/classes/resolver/controller/console/class_ConsoleControllerResolver.php
+++ b/framework/main/classes/resolver/controller/console/class_ConsoleControllerResolver.php
@@ -56,7 +56,7 @@ class ConsoleControllerResolver extends BaseControllerResolver implements Contro
 	 * @throws	InvalidArgumentException		Thrown if default controller is not set
 	 * @throws	InvalidControllerException	Thrown if default controller is invalid
 	 */
-	public static final function createConsoleControllerResolver ($namespace, $controllerName) {
+	public static final function createConsoleControllerResolver (string $namespace, string $controllerName) {
 		// Create the new instance
 		$resolverInstance = new ConsoleControllerResolver();
 
diff --git a/framework/main/classes/resolver/controller/html/class_HtmlControllerResolver.php b/framework/main/classes/resolver/controller/html/class_HtmlControllerResolver.php
index b1237daf..4d164176 100644
--- a/framework/main/classes/resolver/controller/html/class_HtmlControllerResolver.php
+++ b/framework/main/classes/resolver/controller/html/class_HtmlControllerResolver.php
@@ -56,7 +56,7 @@ class HtmlControllerResolver extends BaseControllerResolver implements Controlle
 	 * @throws	InvalidArgumentException		Thrown if default controller is not set
 	 * @throws	InvalidControllerException	Thrown if default controller is invalid
 	 */
-	public static final function createHtmlControllerResolver ($namespace, $controllerName) {
+	public static final function createHtmlControllerResolver (string $namespace, string $controllerName) {
 		// Create the new instance
 		$resolverInstance = new HtmlControllerResolver();
 
diff --git a/framework/main/classes/resolver/controller/image/class_ImageControllerResolver.php b/framework/main/classes/resolver/controller/image/class_ImageControllerResolver.php
index 6201a284..9fead583 100644
--- a/framework/main/classes/resolver/controller/image/class_ImageControllerResolver.php
+++ b/framework/main/classes/resolver/controller/image/class_ImageControllerResolver.php
@@ -56,7 +56,7 @@ class ImageControllerResolver extends BaseControllerResolver implements Controll
 	 * @throws	InvalidArgumentException		Thrown if default controller is not set
 	 * @throws	InvalidControllerException	Thrown if default controller is invalid
 	 */
-	public static final function createImageControllerResolver ($namespace, $controllerName) {
+	public static final function createImageControllerResolver (string $namespace, string $controllerName) {
 		// Create the new instance
 		$resolverInstance = new ImageControllerResolver();
 
diff --git a/framework/main/classes/stacker/file/class_BaseFileStack.php b/framework/main/classes/stacker/file/class_BaseFileStack.php
index 7e09a36d..3eaa1f1d 100644
--- a/framework/main/classes/stacker/file/class_BaseFileStack.php
+++ b/framework/main/classes/stacker/file/class_BaseFileStack.php
@@ -7,7 +7,6 @@ use Org\Mxchange\CoreFramework\Factory\Stack\File\FileStackIndexFactory;
 use Org\Mxchange\CoreFramework\Factory\Object\ObjectFactory;
 use Org\Mxchange\CoreFramework\Filesystem\File\BaseBinaryFile;
 use Org\Mxchange\CoreFramework\Generic\UnsupportedOperationException;
-use Org\Mxchange\CoreFramework\Iterator\Filesystem\SeekableWritableFileIterator;
 use Org\Mxchange\CoreFramework\Stack\BaseStacker;
 use Org\Mxchange\CoreFramework\Traits\Index\IndexableTrait;
 use Org\Mxchange\CoreFramework\Traits\Iterator\IteratorTrait;
diff --git a/framework/main/interfaces/iterator/file/class_SeekableWritableFileIterator.php b/framework/main/interfaces/iterator/file/class_SeekableWritableFileIterator.php
deleted file mode 100644
index 5c3b67cc..00000000
--- a/framework/main/interfaces/iterator/file/class_SeekableWritableFileIterator.php
+++ /dev/null
@@ -1,201 +0,0 @@
-<?php
-// Own namespace
-namespace Org\Mxchange\CoreFramework\Iterator\Filesystem;
-
-// Import SPL stuff
-use \SeekableIterator;
-
-/**
- * An interface for seekable iterators which also allow to write to the file
- * in different ways.
- *
- * @author		Roland Haeder <webmaster@ship-simu.org>
- * @version		0.0.0
- * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2021 Core Developer Team
- * @license		GNU GPL 3.0 or any newer version
- * @link		http://www.ship-simu.org
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-interface SeekableWritableFileIterator extends SeekableIterator {
-	/**
-	 * Size of file stack
-	 *
-	 * @return	$size	Size (in bytes) of file
-	 */
-	function size ();
-
-	/**
-	 * Reads given amount of bytes from file.
-	 *
-	 * @param	$bytes	Amount of bytes to read
-	 * @return	$data	Data read from file
-	 */
-	function read (int $bytes = 0);
-
-	/**
-	 * Analyzes entries in index file. This will count all found (and valid)
-	 * entries, mark invalid as damaged and count gaps ("fragmentation"). If
-	 * only gaps are found, the file is considered as "virgin" (no entries).
-	 *
-	 * @return	void
-	 */
-	function analyzeFileStructure ();
-
-	/**
-	 * Checks whether the file header is initialized
-	 *
-	 * @return	$isInitialized	Whether the file header is initialized
-	 */
-	function isFileHeaderInitialized ();
-
-	/**
-	 * Creates the assigned file
-	 *
-	 * @return	void
-	 */
-	function createFileHeader ();
-
-	/**
-	 * Pre-allocates file (if enabled) with some space for later faster write access.
-	 *
-	 * @param	$type	Type of the file
-	 * @return	void
-	 */
-	function preAllocateFile (string $type);
-
-	/**
-	 * Initializes counter for valid entries, arrays for damaged entries and
-	 * an array for gap seek positions. If you call this method on your own,
-	 * please re-analyze the file structure. So you are better to call
-	 * analyzeFileStructure() instead of this method.
-	 *
-	 * @return	void
-	 */
-	function initCountersGapsArray ();
-
-	/**
-	 * Getter for header size
-	 *
-	 * @return	$totalEntries	Size of file header
-	 */
-	function getHeaderSize ();
-
-	/**
-	 * Setter for header size
-	 *
-	 * @param	$headerSize		Size of file header
-	 * @return	void
-	 */
-	function setHeaderSize (int $headerSize);
-
-	/**
-	 * Getter for header array
-	 *
-	 * @return	$totalEntries	Size of file header
-	 */
-	function getHeader ();
-
-	/**
-	 * Setter for header
-	 *
-	 * @param	$header		Array for a file header
-	 * @return	void
-	 */
-	function setHeader (array $header);
-
-	/**
-	 * Updates seekPosition attribute from file to avoid to much access on file.
-	 *
-	 * @return	void
-	 */
-	function updateSeekPosition ();
-
-	/**
-	 * Getter for total entries
-	 *
-	 * @return	$totalEntries	Total entries in this file
-	 */
-	function getCounter ();
-
-	/**
-	 * "Getter" for file size
-	 *
-	 * @return	$fileSize	Size of currently loaded file
-	 */
-	function getFileSize ();
-
-	/**
-	 * Getter for seek position
-	 *
-	 * @return	$seekPosition	Current seek position (stored here in object)
-	 */
-	function getSeekPosition ();
-
-	/**
-	 * Searches for next suitable gap the given length of data can fit in
-	 * including padding bytes.
-	 *
-	 * @param	$length			Length of raw data
-	 * @return	$seekPosition	Found next gap's seek position
-	 */
-	function searchNextGap (int $length);
-
-	/**
-	 * Checks whether the abstracted file only contains gaps by counting all
-	 * gaps' bytes together and compare it to total length.
-	 *
-	 * @return	$isGapsOnly		Whether the abstracted file only contains gaps
-	 */
-	function isFileGapsOnly();
-
-	/**
-	 * Writes data at given position
-	 *
-	 * @param	$seekPosition	Seek position
-	 * @param	$data			Data to be written
-	 * @param	$flushHeader	Whether to flush the header (default: flush)
-	 * @return	void
-	 */
-	function writeData (int $seekPosition, string $data, bool $flushHeader = true);
-
-	/**
-	 * Writes at given position by seeking to it.
-	 *
-	 * @param	$seekPosition	Seek position in file
-	 * @param	$data			Data to be written
-	 * @return	mixed			Number of writes bytes or false on error
-	 */
-	function writeAtPosition (int $seedPosition, string $data);
-
-	/**
-	 * Writes given value to the file and returns a hash and gap position for it
-	 *
-	 * @param	$groupId	Group identifier
-	 * @param	$value		Value to be added to the stack
-	 * @return	$data		Hash and gap position
-	 */
-	function writeValueToFile (string $groupId, $value);
-
-	/**
-	 * Writes given raw data to the file and returns a gap position and length
-	 *
-	 * @param	$groupId	Group identifier
-	 * @param	$hash		Hash from encoded value
-	 * @param	$encoded	Encoded value to be written to the file
-	 * @return	$data		Gap position and length of the raw data
-	 */
-	function writeDataToFreeGap (string $groupId, string $hash, string $encoded);
-
-}