*
* @author Roland Haeder <webmaster@ship-simu.org>
* @version 0.0.0
- * @copyright Copyright(c) 2007, 2008 Roland Haeder, this is free software
+ * @copyright Copyright (c) 2007, 2008 Roland Haeder, this is free software
* @license GNU GPL 3.0 or any newer version
* @link http://www.ship-simu.org
*
class LocalFileDatabase extends BaseDatabaseFrontend implements DatabaseFrontendInterface {
// Constants for MySQL backward-compatiblity (PLEASE FIX THEM!)
- const DB_CODE_TABLE_MISSING = 0x010;
- const DB_CODE_TABLE_UNWRITEABLE = 0x011;
+ const DB_CODE_TABLE_MISSING = 0x100;
+ const DB_CODE_TABLE_UNWRITEABLE = 0x101;
+ const DB_CODE_DATA_FILE_CORRUPT = 0x102;
/**
* Save path for "file database"
*/
private $lastException = null;
+ /**
+ * Table information array
+ */
+ private $tableInfo = array();
+
/**
* The protected constructor. Do never instance from outside! You need to
* set a local file path. The class will then validate it.
// Call parent constructor
parent::__construct(__CLASS__);
- // Set description
- $this->setObjectDescription("Class for local file databases");
-
- // Create unique ID
- $this->generateUniqueId();
-
// Clean up a little
+ $this->removeNumberFormaters();
$this->removeSystemArray();
}
return $this->lastException;
}
- /**
- * Saves a given object to the local file system by serializing and
- * transparently compressing it
- *
- * @param $object The object we shall save to the local file system
- * @return void
- */
- public final function saveObject (FrameworkInterface $object) {
- // Get a string containing the serialized object. We cannot exchange
- // $this and $object here because $object does not need to worry
- // about it's limitations... ;-)
- $serialized = $this->serializeObject($object);
-
- // Get a path name plus file name and append the extension
- $fqfn = $this->getSavePath() . $object->getPathFileNameFromObject() . "." . $this->getFileExtension();
-
- // Save the file to disc we don't care here if the path is there,
- // this must be done in later methods.
- $this->getFileIoInstance()->saveFile($fqfn, array($this->getCompressorChannel()->getCompressorExtension(), $serialized));
- }
-
- /**
- * Get a serialized string from the given object
- *
- * @param $object The object we want to serialize and transparently
- * compress
- * @return $serialized A string containing the serialzed/compressed object
- * @see ObjectLimits An object holding limition information
- * @see SerializationContainer A special container class for e.g.
- * attributes from limited objects
- */
- private function serializeObject (FrameworkInterface $object) {
- // If there is no limiter instance we serialize the whole object
- // otherwise only in the limiter object (ObjectLimits) specified
- // attributes summarized in a special container class
- if ($this->getLimitInstance() === null) {
- // Serialize the whole object. This tribble call is the reason
- // why we need a fall-back implementation in CompressorChannel
- // of the methods compressStream() and decompressStream().
- $serialized = $this->getCompressorChannel()->getCompressor()->compressStream(serialize($object));
- } else {
- // Serialize only given attributes in a special container
- $container = SerializationContainer::createSerializationContainer($this->getLimitInstance(), $object);
-
- // Serialize the container
- $serialized = $this->getCompressorChannel()->getCompressor()->compressStream(serialize($container));
- }
-
- // Return the serialized object string
- return $serialized;
- }
-
/**
* Analyses if a unique ID has already been used or not by search in the
* local database folder.
* @throws NoArrayCreatedException If explode() fails to create an array
* @throws InvalidArrayCountException If the array contains less or
* more than two elements
+ * @deprecated
*/
public function isUniqueIdUsed ($uniqueID, $inConstructor = false) {
// Currently not used... ;-)
if ($inConstructor) {
return false;
} else {
- throw new NoArrayCreatedException(array($this, "pathFile"), self::EXCEPTION_ARRAY_EXPECTED);
+ throw new NoArrayCreatedException(array($this, 'pathFile'), self::EXCEPTION_ARRAY_EXPECTED);
}
} elseif (count($pathFile) != 2) {
// Invalid ID returned!
if ($inConstructor) {
return false;
} else {
- throw new InvalidArrayCountException(array($this, "pathFile", count($pathFile), 2), self::EXCEPTION_ARRAY_HAS_INVALID_COUNT);
+ throw new InvalidArrayCountException(array($this, 'pathFile', count($pathFile), 2), self::EXCEPTION_ARRAY_HAS_INVALID_COUNT);
}
}
// Initialize the search loop
$isValid = false;
- while ($dataFile = $dirInstance->readDirectoryExcept(array(".", "..", ".htaccess", ".svn"))) {
+ while ($dataFile = $dirInstance->readDirectoryExcept(array(".", "..", ".htaccess", ".svn", "info." . $this->getFileExtension()))) {
// Generate FQFN for testing
$fqfn = sprintf("%s/%s", $pathName, $dataFile);
$this->setLastFile($fqfn);
}
/**
- * Get cached (last fetched) data from the local file database
+ * Reads a local data file and returns it's contents in an array
*
- * @param $uniqueID The ID number for looking up the data
- * @return $object The restored object from the maybe compressed
- * serialized data
- * @throws MismatchingCompressorsException If the compressor from
- * the loaded file
- * mismatches with the
- * current used one.
- * @throws NullPointerException If the restored object
- * is null
- * @throws NoObjectException If the restored "object"
- * is not an object instance
- * @throws MissingMethodException If the required method
- * toString() is missing
+ * @param $fqfn The FQFN for the requested file
+ * @return $dataArray
*/
- public final function getObjectFromCachedData ($uniqueID) {
- // Get instance for file handler
- $inputHandler = $this->getFileIoInstance();
-
- // Get last file's name and contents
- $fqfn = $this->repairFQFN($this->getLastFile(), $uniqueID);
- $contents = $this->repairContents($this->getLastContents(), $fqfn);
-
- // Let's decompress it. First we need the instance
- $compressInstance = $this->getCompressorChannel();
-
- // Is the compressor's extension the same as the one from the data?
- if ($compressInstance->getCompressorExtension() != $contents['header'][0]) {
- /**
- * @todo For now we abort here but later we need to make this a little more dynamic.
- */
- throw new MismatchingCompressorsException(array($this, $contents['header'][0], $fqfn, $compressInstance->getCompressorExtension()), self::EXCEPTION_MISMATCHING_COMPRESSORS);
- }
+ private function getDataArrayFromFile ($fqfn) {
+ // Get a file pointer
+ $fileInstance = FrameworkFileInputPointer::createFrameworkFileInputPointer($fqfn);
- // Decompress the data now
- $serialized = $compressInstance->getCompressor()->decompressStream($contents['data']);
-
- // And unserialize it...
- $object = unserialize($serialized);
-
- // This must become a valid object, so let's check it...
- if (is_null($object)) {
- // Is null, throw exception
- throw new NullPointerException($object, self::EXCEPTION_IS_NULL_POINTER);
- } elseif (!is_object($object)) {
- // Is not an object, throw exception
- throw new NoObjectException($object, self::EXCEPTION_IS_NO_OBJECT);
- } elseif (!$object instanceof FrameworkInterface) {
- // A highly required method was not found... :-(
- throw new MissingMethodException(array($object, '__toString'), self::EXCEPTION_MISSING_METHOD);
- }
+ // Get the raw data and BASE64-decode it
+ $compressedData = base64_decode($fileInstance->readLinesFromFile());
+
+ // Close the file and throw the instance away
+ $fileInstance->closeFile();
+ unset($fileInstance);
+
+ // Decompress it
+ $serializedData = $this->getCompressorChannel()->getCompressor()->decompressStream($compressedData);
+
+ // Unserialize it
+ $dataArray = unserialize($serializedData);
- // And return the object
- return $object;
+ // Finally return it
+ return $dataArray;
}
/**
- * Private method for re-gathering (repairing) the FQFN
+ * Writes data array to local file
*
- * @param $fqfn The current FQFN we shall validate
- * @param $uniqueID The unique ID number
- * @return $fqfn The repaired FQFN when it is empty
- * @throws NoArrayCreatedException If explode() has not
- * created an array
- * @throws InvalidArrayCountException If the array count is not
- * as the expected
+ * @param $fqfn The FQFN of the local file
+ * @param $dataArray An array with all the data we shall write
+ * @return void
*/
- private function repairFQFN ($fqfn, $uniqueID) {
- // Cast both strings
- $fqfn = (string) $fqfn;
- $uniqueID = (string) $uniqueID;
-
- // Is there pre-cached data available?
- if (empty($fqfn)) {
- // Split the unique ID up in path and file name
- $pathFile = explode("@", $uniqueID);
-
- // Are there two elements? Index 0 is the path, 1 the file name + global extension
- if (!is_array($pathFile)) {
- // No array found
- throw new NoArrayCreatedException(array($this, "pathFile"), self::EXCEPTION_ARRAY_EXPECTED);
- } elseif (count($pathFile) != 2) {
- // Invalid ID returned!
- throw new InvalidArrayCountException(array($this, "pathFile", count($pathFile), 2), self::EXCEPTION_ARRAY_HAS_INVALID_COUNT);
- }
+ private function writeDataArrayToFqfn ($fqfn, array $dataArray) {
+ // Get a file pointer instance
+ $fileInstance = FrameworkFileOutputPointer::createFrameworkFileOutputPointer($fqfn, 'w');
- // Create full path name
- $pathName = $this->getSavePath() . $pathFile[0];
+ // Serialize and compress it
+ $compressedData = $this->getCompressorChannel()->getCompressor()->compressStream(serialize($dataArray));
- // Nothing cached, so let's create a FQFN first
- $fqfn = sprintf("%s/%s.%s", $pathName, $pathFile[1], $this->getFileExtension());
- $this->setLastFile($fqfn);
- }
+ // Write this data BASE64 encoded to the file
+ $fileInstance->writeToFile(base64_encode($compressedData));
- // Return repaired FQFN
- return $fqfn;
+ // Close the file pointer
+ $fileInstance->closeFile();
}
/**
- * Private method for re-gathering the contents of a given file
+ * Getter for table information file contents or an empty if the info file was not created
*
- * @param $contents The (maybe) already cached contents as an array
- * @param $fqfn The current FQFN we shall validate
- * @return $contents The repaired contents from the given file
+ * @param $dataSetInstance An instance of a database set class
+ * @return $infoArray An array with all table informations
*/
- private function repairContents ($contents, $fqfn) {
- // Is there some content and header (2 indexes) in?
- if ((!is_array($contents)) || (count($contents) != 2) || (!isset($contents['header'])) || (!isset($contents['data']))) {
- // No content found so load the file again
- $contents = $inputHandler->loadFileContents($fqfn);
-
- // And remember all data for later usage
- $this->setLastContents($contents);
+ private function getContentsFromTableInfoFile (StoreableCriteria $dataSetInstance) {
+ // Default content is no data
+ $infoArray = array();
+
+ // Create FQFN for getting the table information file
+ $fqfn = $this->getSavePath() . $dataSetInstance->getTableName() . '/info.' . $this->getFileExtension();
+
+ // Get the file contents
+ try {
+ $infoArray = $this->getDataArrayFromFile($fqfn);
+ } catch (FileNotFoundException $e) {
+ // Not found, so ignore it here
}
- // Return the repaired contents
- return $contents;
+ // ... and return it
+ return $infoArray;
}
/**
- * Makes sure that the database connection is alive
+ * Creates the table info file from given dataset instance
*
+ * @param $dataSetInstance An instance of a database set class
* @return void
*/
- public function connectToDatabase () {
- // @TODO Do some checks on the database directory and files here
+ private function createTableInfoFile (StoreableCriteria $dataSetInstance) {
+ // Create FQFN for creating the table information file
+ $fqfn = $this->getSavePath() . $dataSetInstance->getTableName() . '/info.' . $this->getFileExtension();
+
+ // Get the data out from dataset in a local array
+ $this->tableInfo[$dataSetInstance->getTableName()] = array(
+ 'primary' => $dataSetInstance->getPrimaryKey(),
+ 'created' => time(),
+ 'last_updated' => time()
+ );
+
+ // Write the data to the file
+ $this->writeDataArrayToFqfn($fqfn, $this->tableInfo[$dataSetInstance->getTableName()]);
}
/**
- * Loads data saved with saveObject from the database and re-creates a
- * full object from it.
- * If limitObject() was called before a new object ObjectContainer with
- * all requested attributes will be returned instead.
+ * Updates the primary key information or creates the table info file if not found
*
- * @return Object The fully re-created object or instance to
- * ObjectContainer
- * @throws SavePathIsEmptyException If the given save path is an
- * empty string
- * @throws SavePathIsNoDirectoryException If the save path is no
- * path (e.g. a file)
- * @throws SavePathReadProtectedException If the save path is read-
- * protected
- * @throws SavePathWriteProtectedException If the save path is write-
- * protected
+ * @param $dataSetInstance An instance of a database set class
+ * @return void
*/
- public function loadObject () {
- // Already connected? Then abort here
- if ($this->alreadyConnected === true) return true;
-
- // Get the save path
- $savePath = $this->getSavePath();
-
- if (empty($savePath)) {
- // Empty string
- throw new SavePathIsEmptyException($dbInstance, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
- } elseif (!is_dir($savePath)) {
- // Is not a dir
- throw new SavePathIsNoDirectoryException($savePath, self::EXCEPTION_INVALID_PATH_NAME);
- } elseif (!is_readable($savePath)) {
- // Path not readable
- throw new SavePathReadProtectedException($savePath, self::EXCEPTION_READ_PROTECED_PATH);
- } elseif (!is_writeable($savePath)) {
- // Path not writeable
- throw new SavePathWriteProtectedException($savePath, self::EXCEPTION_WRITE_PROTECED_PATH);
+ private function updatePrimaryKey (StoreableCriteria $dataSetInstance) {
+ // Get the information array from lower method
+ $infoArray = $this->getContentsFromTableInfoFile($dataSetInstance);
+
+ // Is the primary key there?
+ if (!isset($this->tableInfo['primary'])) {
+ // Then create the info file
+ $this->createTableInfoFile($dataSetInstance);
+ } elseif (($this->getConfigInstance()->readConfig('db_update_primary_forced') === "Y") && ($dataSetInstance->getPrimaryKey() != $this->tableInfo['primary'])) {
+ // Set the array element
+ $this->tableInfo[$dataSetInstance->getTableName()]['primary'] = $dataSetInstance->getPrimaryKey();
+
+ // Update the entry
+ $this->updateTableInfoFile($dataSetInstance);
}
+ }
- // "Connection" established... ;-)
- $this->alreadyConnected = true;
+ /**
+ * Makes sure that the database connection is alive
+ *
+ * @return void
+ * @todo Do some checks on the database directory and files here
+ */
+ public function connectToDatabase () {
}
/**
);
// Initialize limit/skip
- $limitFound = 0; $skipFound = 0;
+ $limitFound = 0;
+ $skipFound = 0;
// Read the directory with some exceptions
- while (($dataFile = $directoryInstance->readDirectoryExcept(array(".", "..", ".htaccess", ".svn"))) && ($limitFound < $criteriaInstance->getLimit())) {
- // Open this file for reading
- $filePointer = FrameworkFileInputPointer::createFrameworkFileInputPointer($pathName . $dataFile);
-
- // Get the raw data and BASE64-decode it
- $compressedData = base64_decode($filePointer->readLinesFromFile());
+ while (($dataFile = $directoryInstance->readDirectoryExcept(array(".", "..", ".htaccess", ".svn", "info." . $this->getFileExtension()))) && ($limitFound < $criteriaInstance->getLimit())) {
+ // Does the extension match?
+ if (substr($dataFile, -(strlen($this->getFileExtension()))) !== $this->getFileExtension()) {
+ // Skip this file!
+ continue;
+ }
- // Close the file and throw the instance away
- $filePointer->closeFile();
- unset($filePointer);
-
- // Decompress it
- $serializedData = $this->getCompressorChannel()->getCompressor()->decompressStream($compressedData);
-
- // Unserialize it
- $dataArray = unserialize($serializedData);
+ // Read the file
+ $dataArray = $this->getDataArrayFromFile($pathName . $dataFile);
// Is this an array?
if (is_array($dataArray)) {
} // END - if
// Entry found!
- $resultData['rows'][] = $dataArray;
+ $resultData['rows'][] = $dataArray;
$limitFound++;
break;
} // END - if
} // END - foreach
- } // END - if
+ } else {
+ // Throw an exception here
+ throw new SqlException(array($this, sprintf("File '%s' contains invalid data.", $dataFile), self::DB_CODE_DATA_FILE_CORRUPT), self::EXCEPTION_SQL_QUERY);
+ }
} // END - while
// Close directory and throw the instance away
);
// Try to save the request away
+ try {
+ // Write the data away
+ $this->writeDataArrayToFqfn($fqfn, $dataSetInstance->getCriteriaArray());
+
+ // Update the primary key
+ $this->updatePrimaryKey($dataSetInstance);
+
+ // Reset last error message and exception
+ $this->resetLastError();
+ } catch (FrameworkException $e) {
+ // Catch all exceptions and store them in last error
+ $this->lastException = $e;
+ $this->lastError = $e->getMessage();
+
+ // Throw an SQL exception
+ throw new SqlException (array($this, sprintf("Cannot write data to table '%s'", $tableName), self::DB_CODE_TABLE_UNWRITEABLE), self::EXCEPTION_SQL_QUERY);
+ }
+ }
+
+ /**
+ * "Updates" a data set instance with a database layer
+ *
+ * @param $dataSetInstance A storeable data set
+ * @return void
+ * @throws SqlException If an SQL error occurs
+ */
+ public function queryUpdateDataSet (StoreableCriteria $dataSetInstance) {
+ // Create full path name
+ $pathName = $this->getSavePath() . $dataSetInstance->getTableName() . '/';
+
+ // Try all the requests
try {
// Get a file pointer instance
- $filePointer = FrameworkFileOutputPointer::createFrameworkFileOutputPointer($fqfn, 'w');
+ $directoryInstance = FrameworkDirectoryPointer::createFrameworkDirectoryPointer($pathName);
+
+ // Initialize limit/skip
+ $limitFound = 0;
+ $skipFound = 0;
// Get the criteria array from the dataset
$criteriaArray = $dataSetInstance->getCriteriaArray();
- // Serialize and compress it
- $compressedData = $this->getCompressorChannel()->getCompressor()->compressStream(serialize($criteriaArray));
+ // Get search criteria
+ $searchInstance = $dataSetInstance->getSearchInstance();
+
+ // Read the directory with some exceptions
+ while (($dataFile = $directoryInstance->readDirectoryExcept(array(".", "..", ".htaccess", ".svn", "info." . $this->getFileExtension()))) && ($limitFound < $searchInstance->getLimit())) {
+ // Does the extension match?
+ if (substr($dataFile, -(strlen($this->getFileExtension()))) !== $this->getFileExtension()) {
+ // Skip this file!
+ continue;
+ }
+
+ // Open this file for reading
+ $dataArray = $this->getDataArrayFromFile($pathName . $dataFile);
+
+ // Is this an array?
+ if (is_array($dataArray)) {
+ // Search in the criteria with FMFW (First Matches, First Wins)
+ foreach ($dataArray as $key=>$value) {
+ // Get criteria element
+ $criteria = $searchInstance->getCriteriaElemnent($key);
+
+ // Is the criteria met?
+ if ((!is_null($criteria)) && ($criteria == $value)) {
+
+ // Shall we skip this entry?
+ if ($searchInstance->getSkip() > 0) {
+ // We shall skip some entries
+ if ($skipFound < $searchInstance->getSkip()) {
+ // Skip this entry
+ $skipFound++;
+ break;
+ } // END - if
+ } // END - if
+
+ // Entry found, so update it
+ foreach ($criteriaArray as $criteriaKey=>$criteriaValue) {
+ $dataArray[$criteriaKey] = $criteriaValue;
+ } // END - foreach
+
+ // Write the data to a local file
+ $this->writeDataArrayToFqfn($pathName . $dataFile, $dataArray);
- // Write this data BASE64 encoded to the file
- $filePointer->writeToFile(base64_encode($compressedData));
+ // Count it
+ $limitFound++;
+ break;
+ } // END - if
+ } // END - foreach
+ } // END - if
+ } // END - while
// Close the file pointer
- $filePointer->closeFile();
+ $directoryInstance->closeDirectory();
+
+ // Update the primary key
+ $this->updatePrimaryKey($dataSetInstance);
// Reset last error message and exception
$this->resetLastError();
$this->lastError = $e->getMessage();
// Throw an SQL exception
- throw new SqlException (array($this, sprintf("Cannot write data to table '%s'", $tableName), self::DB_CODE_TABLE_UNWRITEABLE), self::EXCEPTION_SQL_QUERY);
+ throw new SqlException (array($this, sprintf("Cannot write data to table '%s'", $dataSetInstance->getTableName()), self::DB_CODE_TABLE_UNWRITEABLE), self::EXCEPTION_SQL_QUERY);
}
}
+
+ /**
+ * Getter for primary key of specified table or if not found null will be
+ * returned. This must be database-specific.
+ *
+ * @param $tableName Name of the table we need the primary key from
+ * @return $primaryKey Primary key column of the given table
+ */
+ public function getPrimaryKeyOfTable ($tableName) {
+ // Default key is null
+ $primaryKey = null;
+
+ // Does the table information exist?
+ if (isset($this->tableInfo[$tableName])) {
+ // Then return the primary key
+ $primaryKey = $this->tableInfo[$tableName]['primary'];
+ } // END - if
+
+ // Return the column
+ return $primaryKey;
+ }
}
// [EOF]
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