]> git.mxchange.org Git - core.git/blobdiff - framework/main/classes/stacker/file/class_BaseFileStack.php
Continued:
[core.git] / framework / main / classes / stacker / file / class_BaseFileStack.php
index 8bf35ac9aab88d04dcf03d01b8cddd5c1fb65701..5513c77759fad82ed0eeacafd84c6871692976e2 100644 (file)
@@ -1,28 +1,31 @@
 <?php
 // Own namespace
-namespace Org\Mxchange\CoreFramework\Stacker\Filesystem;
+namespace Org\Mxchange\CoreFramework\Stack\File;
 
 // Import framework stuff
-use Org\Mxchange\CoreFramework\Factory\Filesystem\Stack\FileStackIndexFactory;
+use Org\Mxchange\CoreFramework\Factory\Stack\File\FileStackIndexFactory;
 use Org\Mxchange\CoreFramework\Factory\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\Stacker\BaseStacker;
+use Org\Mxchange\CoreFramework\Stack\BaseStacker;
+use Org\Mxchange\CoreFramework\Stack\File\InvalidMagicException;
+use Org\Mxchange\CoreFramework\Stack\File\StackableFile;
+use Org\Mxchange\CoreFramework\Traits\Index\IndexableTrait;
+use Org\Mxchange\CoreFramework\Traits\Iterator\IteratorTrait;
+use Org\Mxchange\CoreFramework\Utils\String\StringUtils;
 
 // Import SPL stuff
+use \InvalidArgumentException;
 use \SplFileInfo;
+use \UnexpectedValueException;
 
 /**
  * A general file-based stack class
  *
  * @author             Roland Haeder <webmaster@ship-simu.org>
  * @version            0.0.0
-<<<<<<< HEAD:framework/main/classes/stacker/file/class_BaseFileStack.php
- * @copyright  Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2017 Core Developer Team
-=======
- * @copyright  Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2016 Core Developer Team
->>>>>>> Some updates::inc/main/classes/stacker/file/class_BaseFileStack.php
+ * @copyright  Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2020 Core Developer Team
  * @license            GNU GPL 3.0 or any newer version
  * @link               http://www.ship-simu.org
  *
@@ -39,26 +42,12 @@ use \SplFileInfo;
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
-abstract class BaseFileStack extends BaseStacker {
-       /**
-        * Magic for this stack
-        */
-       const STACK_MAGIC = 'STACKv0.1';
-
-       /**
-        * Name of array index for gap position
-        */
-       const ARRAY_INDEX_GAP_POSITION = 'gap';
+abstract class BaseFileStack extends BaseStacker implements StackableFile {
+       // Load traits
+       use IteratorTrait;
 
-       /**
-        * Name of array index for hash
-        */
-       const ARRAY_INDEX_HASH = 'hash';
-
-       /**
-        * Name of array index for length of raw data
-        */
-       const ARRAY_INDEX_DATA_LENGTH = 'length';
+       // Exception codes
+       const EXCEPTION_BAD_MAGIC = 0xe100;
 
        /**
         * Protected constructor
@@ -66,7 +55,7 @@ abstract class BaseFileStack extends BaseStacker {
         * @param       $className      Name of the class
         * @return      void
         */
-       protected function __construct ($className) {
+       protected function __construct (string $className) {
                // Call parent constructor
                parent::__construct($className);
        }
@@ -76,25 +65,37 @@ abstract class BaseFileStack extends BaseStacker {
         *
         * @return      void
         * @todo        To hard assertions here, better rewrite them to exceptions
+        * @throws      UnexpectedValueException        If header is not proper length
+        * @throws      InvalidMagicException   If a bad magic was found
         */
        public function readFileHeader () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
                // First rewind to beginning as the header sits at the beginning ...
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
                $this->getIteratorInstance()->rewind();
 
                // Then read it (see constructor for calculation)
                $data = $this->getIteratorInstance()->read($this->getIteratorInstance()->getHeaderSize());
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Read %d bytes (%d wanted).', __METHOD__, __LINE__, strlen($data), $this->getIteratorInstance()->getHeaderSize()));
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: Read %d bytes (%d wanted).', strlen($data), $this->getIteratorInstance()->getHeaderSize()));
 
                // Have all requested bytes been read?
-               assert(strlen($data) == $this->getIteratorInstance()->getHeaderSize());
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
+               if (strlen($data) != $this->getIteratorInstance()->getHeaderSize()) {
+                       // Bad data length
+                       throw new UnexpectedValueException(sprintf('data(%d)=%s does not match iteratorInstance->headerSize=%d',
+                               strlen($data),
+                               $data,
+                               $this->getIteratorInstance()->getHeaderSize()
+                       ));
+               }
 
                // Last character must be the separator
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] data(-1)=%s', __METHOD__, __LINE__, dechex(ord(substr($data, -1, 1)))));
-               assert(substr($data, -1, 1) == chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES));
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: data(-1)=%s', dechex(ord(substr($data, -1, 1)))));
+               if (substr($data, -1, 1) !== chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES)) {
+                       // Not valid separator
+                       throw new UnexpectedValueException(sprintf('data=%s does not have separator=%s at the end.',
+                               $data,
+                               BaseBinaryFile::SEPARATOR_HEADER_ENTRIES
+                       ));
+               }
 
                // Okay, then remove it
                $data = substr($data, 0, -1);
@@ -111,29 +112,45 @@ abstract class BaseFileStack extends BaseStacker {
                 */
                $header = explode(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA), $data);
 
-               // Set header here
-               $this->getIteratorInstance()->setHeader($header);
-
                // Check if the array has only 3 elements
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] header(%d)=%s', __METHOD__, __LINE__, count($header), print_r($header, true)));
-               assert(count($header) == 3);
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
-
-               // Check magic
-               assert($header[0] == self::STACK_MAGIC);
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: header(%d)=%s', count($header), print_r($header, true)));
+               if (count($header) != 3) {
+                       // Header array count is not expected
+                       throw new UnexpectedValueException(sprintf('data=%s has %d elements, expected 3',
+                               $data,
+                               count($header)
+                       ));
+               } elseif ($header[0] != StackableFile::STACK_MAGIC) {
+                       // Bad magic
+                       throw new InvalidMagicException($data, self::EXCEPTION_BAD_MAGIC);
+               }
 
                // Check length of count and seek position
-               assert(strlen($header[1]) == BaseBinaryFile::LENGTH_COUNT);
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
-               assert(strlen($header[2]) == BaseBinaryFile::LENGTH_POSITION);
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] Passed assert().', __METHOD__, __LINE__));
+               if (strlen($header[1]) != BaseBinaryFile::LENGTH_COUNT) {
+                       // Count length not valid
+                       throw new UnexpectedValueException(sprintf('header[1](%d)=%s is not expected %d length',
+                               strlen($header[1]),
+                               $header[1],
+                               BaseBinaryFile::LENGTH_COUNT
+                       ));
+               } elseif (strlen($header[1]) != BaseBinaryFile::LENGTH_POSITION) {
+                       // Position length not valid
+                       throw new UnexpectedValueException(sprintf('header[2](%d)=%s is not expected %d length',
+                               strlen($header[1]),
+                               $header[1],
+                               BaseBinaryFile::LENGTH_POSITION
+                       ));
+               }
 
                // Decode count and seek position
                $header[1] = hex2bin($header[1]);
                $header[2] = hex2bin($header[2]);
 
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
+               // Set header here
+               $this->getIteratorInstance()->setHeader($header);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: EXIT!', __METHOD__, __LINE__));
        }
 
        /**
@@ -142,24 +159,23 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      void
         */
        public function flushFileHeader () {
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] CALLED!', __METHOD__, __LINE__));
-
                // Put all informations together
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
                $header = sprintf('%s%s%s%s%s%s',
                        // Magic
-                       self::STACK_MAGIC,
+                       StackableFile::STACK_MAGIC,
 
                        // Separator magic<->count
                        chr(BaseBinaryFile::SEPARATOR_HEADER_DATA),
 
                        // Total entries (will be zero) and pad it to 20 chars
-                       str_pad($this->dec2hex($this->getIteratorInstance()->getCounter()), BaseBinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
+                       str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getCounter()), BaseBinaryFile::LENGTH_COUNT, '0', STR_PAD_LEFT),
 
                        // Separator count<->seek position
                        chr(BaseBinaryFile::SEPARATOR_HEADER_DATA),
 
                        // Position (will be zero)
-                       str_pad($this->dec2hex($this->getIteratorInstance()->getSeekPosition(), 2), BaseBinaryFile::LENGTH_POSITION, '0', STR_PAD_LEFT),
+                       str_pad(StringUtils::dec2hex($this->getIteratorInstance()->getSeekPosition(), 2), BaseBinaryFile::LENGTH_POSITION, '0', STR_PAD_LEFT),
 
                        // Separator position<->entries
                        chr(BaseBinaryFile::SEPARATOR_HEADER_ENTRIES)
@@ -168,7 +184,8 @@ abstract class BaseFileStack extends BaseStacker {
                // Write it to disk (header is always at seek position 0)
                $this->getIteratorInstance()->writeData(0, $header, false);
 
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] EXIT!', __METHOD__, __LINE__));
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: EXIT!');
        }
 
        /**
@@ -177,24 +194,29 @@ abstract class BaseFileStack extends BaseStacker {
         * @param       $fileInfoInstance       An instance of a SplFileInfo class
         * @param       $type           Type of this stack (e.g. url_source for URL sources)
         * @return      void
+        * @throws      InvalidArgumentException        If a parameter is invalid
         * @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.
         */
-       protected function initFileStack (SplFileInfo $fileInfoInstance, $type) {
+       protected function initFileStack (SplFileInfo $fileInfoInstance, string $type) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: fileInfoInstance[%s]=%s,type=%s - CALLED!', get_class($fileInfoInstance), $fileInfoInstance, $type));
+               if (empty($type)) {
+                       // Invalid parameter
+                       throw new InvalidArgumentException('Parameter "type" is empty');
+               }
+
                // Get a stack file instance
-               $fileInstance = ObjectFactory::createObjectByConfiguredName('stack_file_class', array($fileInfoInstance, $this));
+               $stackInstance = ObjectFactory::createObjectByConfiguredName('stack_file_class', array($fileInfoInstance, $this));
 
                // Get iterator instance
-               $iteratorInstance = ObjectFactory::createObjectByConfiguredName('file_iterator_class', array($fileInstance));
-
-               // Is the instance implementing the right interface?
-               assert($iteratorInstance instanceof SeekableWritableFileIterator);
+               $iteratorInstance = ObjectFactory::createObjectByConfiguredName('file_iterator_class', array($stackInstance));
 
                // Set iterator here
                $this->setIteratorInstance($iteratorInstance);
 
                // Calculate header size
                $this->getIteratorInstance()->setHeaderSize(
-                       strlen(self::STACK_MAGIC) +
+                       strlen(StackableFile::STACK_MAGIC) +
                        strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA)) +
                        BaseBinaryFile::LENGTH_COUNT +
                        strlen(chr(BaseBinaryFile::SEPARATOR_HEADER_DATA)) +
@@ -212,7 +234,7 @@ abstract class BaseFileStack extends BaseStacker {
 
                        // And pre-allocate a bit
                        $this->getIteratorInstance()->preAllocateFile('file_stack');
-               } // END - if
+               }
 
                // Load the file header
                $this->readFileHeader();
@@ -228,6 +250,9 @@ abstract class BaseFileStack extends BaseStacker {
 
                // And set it here
                $this->setIndexInstance($indexInstance);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: EXIT!');
        }
 
        /**
@@ -237,20 +262,22 @@ abstract class BaseFileStack extends BaseStacker {
         * @param       $value                  Value to add to this stacker
         * @return      void
         * @throws      FullStackerException    If the stack is full
-        */
-       protected function addValue ($stackerName, $value) {
-               // Do some tests
-               if ($this->isStackFull($stackerName)) {
+        * @throws      InvalidArgumentException        If a parameter is not valid
+        * @throws      InvalidArgumentException        Not all variable types are wanted here
+        */
+       protected function addValue (string $stackerName, $value) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s,value[%s]=%s - CALLED!', $stackerName, gettype($value), print_r($value, true)));
+               if (empty($stackerName)) {
+                       // No empty stack name
+                       throw new InvalidArgumentException('Parameter "stackerName" is empty');
+               } elseif ($this->isStackFull($stackerName)) {
                        // Stacker is full
                        throw new FullStackerException(array($this, $stackerName, $value), self::EXCEPTION_STACKER_IS_FULL);
-               } // END - if
-
-               // Debug message
-               //* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName . ',value[' . gettype($value) . ']=' . print_r($value, true));
-
-               // No objects/resources are allowed as their serialization takes to long
-               assert(!is_object($value));
-               assert(!is_resource($value));
+               } elseif (is_resource($value) || is_object($value)) {
+                       // Not wanted type
+                       throw new InvalidArgumentException(sprintf('value[]=%s is not supported', gettype($value)));
+               }
 
                /*
                 * Now add the value to the file stack which returns gap position, a
@@ -260,6 +287,9 @@ abstract class BaseFileStack extends BaseStacker {
 
                // Add the hash and gap position to the index
                $this->getIndexInstance()->addHashToIndex($stackerName, $data);
+
+               // Trace message
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: EXIT!');
        }
 
        /**
@@ -267,20 +297,26 @@ abstract class BaseFileStack extends BaseStacker {
         *
         * @param       $stackerName    Name of the stack
         * @return      $value                  Value of last added value
-        * @throws      EmptyStackerException   If the stack is empty
-        */
-       protected function getLastValue ($stackerName) {
-               // Is the stack not yet initialized or full?
-               if ($this->isStackEmpty($stackerName)) {
+        * @throws      InvalidArgumentException        If a parameter is not valid
+        * @throws      BadMethodCallException  If the stack is empty
+        */
+       protected function getLastValue (string $stackerName) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+               if (empty($stackerName)) {
+                       // No empty stack name
+                       throw new InvalidArgumentException('Parameter "stackerName" is empty');
+               } elseif ($this->isStackEmpty($stackerName)) {
                        // Throw an exception
-                       throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-               } // END - if
+                       throw new BadMethodCallException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
+               }
 
                // Now get the last value
                /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
                $value = NULL;
 
                // Return it
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: value[]=%s - EXIT!', gettype($value)));
                return $value;
        }
 
@@ -289,20 +325,26 @@ abstract class BaseFileStack extends BaseStacker {
         *
         * @param       $stackerName    Name of the stack
         * @return      $value                  Value of last added value
-        * @throws      EmptyStackerException   If the stack is empty
-        */
-       protected function getFirstValue ($stackerName) {
-               // Is the stack not yet initialized or full?
-               if ($this->isStackEmpty($stackerName)) {
+        * @throws      InvalidArgumentException        If a parameter is not valid
+        * @throws      BadMethodCallException  If the stack is empty
+        */
+       protected function getFirstValue (string $stackerName) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+               if (empty($stackerName)) {
+                       // No empty stack name
+                       throw new InvalidArgumentException('Parameter "stackerName" is empty');
+               } elseif ($this->isStackEmpty($stackerName)) {
                        // Throw an exception
-                       throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-               } // END - if
+                       throw new BadMethodCallException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
+               }
 
                // Now get the first value
                /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
                $value = NULL;
 
                // Return it
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: value[]=%s - EXIT!', gettype($value)));
                return $value;
        }
 
@@ -311,14 +353,19 @@ abstract class BaseFileStack extends BaseStacker {
         *
         * @param       $stackerName    Name of the stack
         * @return      $value                  Value "poped" from array
-        * @throws      EmptyStackerException   If the stack is empty
-        */
-       protected function popLast ($stackerName) {
-               // Is the stack not yet initialized or full?
-               if ($this->isStackEmpty($stackerName)) {
+        * @throws      InvalidArgumentException        If a parameter is not valid
+        * @throws      BadMethodCallException  If the stack is empty
+        */
+       protected function popLast (string $stackerName) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+               if (empty($stackerName)) {
+                       // No empty stack name
+                       throw new InvalidArgumentException('Parameter "stackerName" is empty');
+               } elseif ($this->isStackEmpty($stackerName)) {
                        // Throw an exception
-                       throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-               } // END - if
+                       throw new BadMethodCallException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
+               }
 
                // Now, remove the last entry, we don't care about the return value here, see elseif() block above
                /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
@@ -330,14 +377,19 @@ abstract class BaseFileStack extends BaseStacker {
         *
         * @param       $stackerName    Name of the stack
         * @return      $value                  Value "shifted" from array
-        * @throws      EmptyStackerException   If the named stacker is empty
-        */
-       protected function popFirst ($stackerName) {
-               // Is the stack not yet initialized or full?
-               if ($this->isStackEmpty($stackerName)) {
+        * @throws      InvalidArgumentException        If a parameter is not valid
+        * @throws      BadMethodCallException  If the named stacker is empty
+        */
+       protected function popFirst (string $stackerName) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+               if (empty($stackerName)) {
+                       // No empty stack name
+                       throw new InvalidArgumentException('Parameter "stackerName" is empty');
+               } elseif ($this->isStackEmpty($stackerName)) {
                        // Throw an exception
-                       throw new EmptyStackerException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
-               } // END - if
+                       throw new BadMethodCallException(array($this, $stackerName), self::EXCEPTION_STACKER_IS_EMPTY);
+               }
 
                // Now, remove the last entry, we don't care about the return value here, see elseif() block above
                /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
@@ -349,13 +401,22 @@ abstract class BaseFileStack extends BaseStacker {
         *
         * @param       $stackerName    Name of the stack
         * @return      $isFull                 Whether the stack is full
+        * @throws      InvalidArgumentException        If a parameter is not valid
         */
-       protected function isStackFull ($stackerName) {
-               // File-based stacks will only run full if the disk space is low.
+       protected function isStackFull (string $stackerName) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+               if (empty($stackerName)) {
+                       // No empty stack name
+                       throw new InvalidArgumentException('Parameter "stackerName" is empty');
+               }
+
                // @TODO Please implement this, returning false
+               /* NOISY-DEBUG: */ $this->partialStub('[' . __METHOD__ . ':' . __LINE__ . '] stackerName=' . $stackerName);
                $isFull = false;
 
                // Return result
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: isFull=%d - EXIT!', intval($isFull)));
                return $isFull;
        }
 
@@ -364,13 +425,22 @@ abstract class BaseFileStack extends BaseStacker {
         *
         * @param       $stackerName            Name of the stack
         * @return      $isEmpty                        Whether the stack is empty
-        * @throws      NoStackerException      If given stack is missing
+        * @throws      InvalidArgumentException        If a parameter is not valid
+        * @throws      BadMethodCallException  If given stack is missing
         */
-       public function isStackEmpty ($stackerName) {
+       public function isStackEmpty (string $stackerName) {
+               // Validate parameter
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+               if (empty($stackerName)) {
+                       // No empty stack name
+                       throw new InvalidArgumentException('Parameter "stackerName" is empty');
+               }
+
                // So, is the stack empty?
                $isEmpty = (($this->getStackCount($stackerName)) == 0);
 
                // Return result
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: isEmpty=%d - EXIT!', intval($isEmpty)));
                return $isEmpty;
        }
 
@@ -382,7 +452,7 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      void
         * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
         */
-       public function initStack ($stackerName, $forceReInit = false) {
+       public function initStack (string $stackerName, bool $forceReInit = false) {
                throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
        }
 
@@ -392,7 +462,7 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      void
         * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
         */
-       public function initStacks (array $stacks, $forceReInit = false) {
+       public function initStacks (array $stacks, bool $forceReInit = false) {
                throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
        }
 
@@ -403,7 +473,7 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      $isInitialized  Whether the stack is initialized
         * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
         */
-       public function isStackInitialized ($stackerName) {
+       public function isStackInitialized (string $stackerName) {
                throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
        }
 
@@ -423,9 +493,14 @@ abstract class BaseFileStack extends BaseStacker {
         * @param       $stackerName    Name of the stack
         * @return      $count                  Size of stack (array count)
         */
-       public function getStackCount ($stackerName) {
+       public function getStackCount (string $stackerName) {
                // Now, simply return the found count value, this must be up-to-date then!
-               return $this->getIteratorInstance()->getCounter();
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: stackerName=%s - CALLED!', $stackerName));
+               $count = $this->getIteratorInstance()->getCounter();
+
+               // Return count
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: count=%d - EXIT!', $count));
+               return $count;
        }
 
        /**
@@ -435,6 +510,7 @@ abstract class BaseFileStack extends BaseStacker {
         */
        public function calculateMinimumBlockLength () {
                // Calulcate it
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
                $length =
                        // Length of entry group
                        BaseBinaryFile::LENGTH_GROUP + strlen(chr(BaseBinaryFile::SEPARATOR_GROUP_HASH)) +
@@ -444,6 +520,7 @@ abstract class BaseFileStack extends BaseStacker {
                        strlen(chr(BaseBinaryFile::SEPARATOR_ENTRIES));
 
                // Return it
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: length=%d - EXIT!', $length));
                return $length;
        }
 
@@ -477,7 +554,7 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      void
         * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
         */
-       public final function setHeaderSize ($headerSize) {
+       public final function setHeaderSize (int $headerSize) {
                throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
        }
 
@@ -531,8 +608,8 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      void
         * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
         */
-       public function writeData ($seekPosition, $data, $flushHeader = true) {
-               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] seekPosition=%s,data[]=%s,flushHeader=%d', __METHOD__, __LINE__, $seekPosition, gettype($data), intval($flushHeader)));
+       public function writeData (int $seekPosition, string $data, bool $flushHeader = true) {
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: seekPosition=%s,data[]=%s,flushHeader=%d', $seekPosition, gettype($data), intval($flushHeader)));
                throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
        }
 
@@ -544,8 +621,8 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      $data           Hash and gap position
         * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
         */
-       public function writeValueToFile ($groupId, $value) {
-               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,value[%s]=%s', __METHOD__, __LINE__, $groupId, gettype($value), print_r($value, true)));
+       public function writeValueToFile (string $groupId, $value) {
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,value[%s]=%s', $groupId, gettype($value), print_r($value, true)));
                throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
        }
 
@@ -557,8 +634,9 @@ abstract class BaseFileStack extends BaseStacker {
         * @return      $seekPosition   Found next gap's seek position
         * @throws      UnsupportedOperationException   This method is not (and maybe never will be) supported
         */
-       public function searchNextGap ($length) {
-               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] length=%s', __METHOD__, __LINE__, $length));
+       public function searchNextGap (int $length) {
+               // Not supported here
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: length=%d - CALLED!', $length));
                throw new UnsupportedOperationException(array($this, __FUNCTION__, $this->getIteratorInstance()->getPointerInstance()), self::EXCEPTION_UNSPPORTED_OPERATION);
        }
 
@@ -569,7 +647,12 @@ abstract class BaseFileStack extends BaseStacker {
         */
        public function getFileSize () {
                // Call iterator's method
-               return $this->getIteratorInstance()->getFileSize();
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput('BASE-FILE-STACK: CALLED!');
+               $size = $this->getIteratorInstance()->getFileSize();
+
+               // Return size
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: size=%d - EXIT!', $size));
+               return $size;
        }
 
        /**
@@ -580,11 +663,9 @@ abstract class BaseFileStack extends BaseStacker {
         * @param       $encoded        Encoded value to be written to the file
         * @return      $data           Gap position and length of the raw data
         */
-       public function writeDataToFreeGap ($groupId, $hash, $encoded) {
-               // Debug message
-               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,encoded()=%d - CALLED!', __METHOD__, __LINE__, $groupId, $hash, strlen($encoded)));
-
+       public function writeDataToFreeGap (string $groupId, string $hash, string $encoded) {
                // Raw data been written to the file
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,encoded()=%d - CALLED!', $groupId, $hash, strlen($encoded)));
                $rawData = sprintf('%s%s%s%s%s',
                        $groupId,
                        BaseBinaryFile::SEPARATOR_GROUP_HASH,
@@ -593,30 +674,32 @@ abstract class BaseFileStack extends BaseStacker {
                        $encoded
                );
 
-               // Debug message
-               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,rawData()=%d', __METHOD__, __LINE__, $groupId, $hash, strlen($rawData)));
-
                // Search for next free gap
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,rawData()=%d', $groupId, $hash, strlen($rawData)));
                $gapPosition = $this->getIteratorInstance()->searchNextGap(strlen($rawData));
 
                // Gap position cannot be smaller than header length + 1
-               assert($gapPosition > $this->getIteratorInstance()->getHeaderSize());
-
-               // Debug message
-               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,gapPosition=%s', __METHOD__, __LINE__, $groupId, $hash, $gapPosition));
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: gapPosition=%d', $gapPosition));
+               if ($gapPosition <= $this->getIteratorInstance()->getHeaderSize()) {
+                       // Improper gap position
+                       throw new UnexpectedValueException(sprintf('gapPosition[%s]=%d is not larger than headerSize=%d',
+                               gettype($gapPosition),
+                               $gapPosition,
+                               $this->getIteratorInstance()->getHeaderSize()
+                       ));
+               }
 
                // Then write the data at that gap
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,gapPosition=%s', $groupId, $hash, $gapPosition));
                $this->getIteratorInstance()->writeData($gapPosition, $rawData);
 
-               // Debug message
-               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('[%s:%d:] groupId=%s,hash=%s,rawData()=%d - EXIT!', __METHOD__, __LINE__, $groupId, $hash, strlen($rawData)));
-
                // Return gap position, hash and length of raw data
-               return array(
-                       self::ARRAY_INDEX_GAP_POSITION => $gapPosition,
-                       self::ARRAY_INDEX_HASH         => $hash,
-                       self::ARRAY_INDEX_DATA_LENGTH  => strlen($rawData)
-               );
+               /* NOISY-DEBUG: */ self::createDebugInstance(__CLASS__, __LINE__)->debugOutput(sprintf('BASE-FILE-STACK: groupId=%s,hash=%s,rawData()=%d - EXIT!', $groupId, $hash, strlen($rawData)));
+               return [
+                       self::ARRAY_NAME_GAP_POSITION => $gapPosition,
+                       self::ARRAY_NAME_HASH         => $hash,
+                       self::ARRAY_NAME_DATA_LENGTH  => strlen($rawData),
+               ];
        }
 
 }