--- /dev/null
+<?php
+
+// Database selector class
+class DatabaseConnection extends BaseMiddleware implements DatabaseConnector, LimitableObject {
+ // Array for connection data
+ private $connectData = array();
+
+ // The real database layer
+ private $dbLayer = null;
+
+ // An instance of this class
+ private static $thisInstance = null;
+
+ // Private constructor
+ private final function __construct() {
+ // Call parent constructor
+ parent::constructor(__CLASS__);
+
+ // Set description
+ $this->setPartDescr("Datenbank-Mittelschicht");
+
+ // Create an unique ID
+ $this->createUniqueID();
+
+ // Clean up a little
+ $this->removeSystemArray();
+ }
+
+ // Create new database connection layer
+ public final static function createDatabaseConnection (DebugMiddleware $debugInstance, DatabaseFrontendInterface $dbLayer) {
+ // Get instance
+ $dbInstance = new DatabaseConnection();
+
+ // Set debug output handler
+ $dbInstance->setDebugInstance($debugInstance);
+
+ // Set database layer
+ $dbInstance->setDatabaseLayer($dbLayer);
+
+ // Set db instance
+ self::$thisInstance = $dbInstance;
+
+ // Return instance
+ return $dbInstance;
+ }
+
+ // Get an instance of this class
+ public final static function getInstance () {
+ return self::$thisInstance;
+ }
+
+ // Public setter for database connection
+ public final function setConnectionData ($login, $pass, $dbase, $host) {
+ // Transfer connection data
+ $this->connectData['login'] = (string) $login;
+ $this->connectData['pass'] = (string) $pass;
+ $this->connectData['dbase'] = (string) $dbase;
+ $this->connectData['host'] = (string) $host;
+ }
+
+ /**
+ * Save a whole object or parts of it to the database or local file
+ *
+ * @param $object The object we shall save
+ * @return void
+ * @throws NullPointerException If $limitInstance is null
+ * @throws NoObjectException If $limitInstance is not an object
+ * @throws MissingMethodException If the required method
+ * saveObject() was not found
+ */
+ public final function saveObject ($object) {
+ // Some sanity checks
+ if (is_null($this->dbLayer)) {
+ // Is null
+ throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
+ } elseif (!is_object($this->dbLayer)) {
+ // Is not an object
+ throw new NoObjectException($this->dbLayer, self::EXCEPTION_IS_NO_OBJECT);
+ } elseif (!method_exists($this->dbLayer, 'saveObject')) {
+ // Does not have the required instance
+ throw new MissingMethodException(array($this->dbLayer, 'saveObject'), self::EXCEPTION_MISSING_METHOD);
+ }
+
+ // For now just pipe it through to the database layer
+ $this->dbLayer->saveObject($object);
+ }
+
+ /**
+ * Set a limitation for the saving process. This shall be done before
+ * saveObject() is called else saveObject() shall save the whole object.
+ *
+ * @param $limitInstance An instance of ObjectLimits which contains
+ * elements we shall exclusivly include in
+ * saving process
+ * @return void
+ * @throws NullPointerException If $limitInstance is null
+ * @throws NoObjectException If $limitInstance is not an object
+ * @throws MissingMethodException If the required method
+ * limitObject() was not found
+ */
+ public final function limitObject (ObjectLimits $limitInstance) {
+ // Get real database connection
+ $this->dbLayer = $this->getDatabaseInstance();
+
+ // Some sanity checks
+ if (is_null($this->dbLayer)) {
+ // Is null
+ throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
+ } elseif (!is_object($this->dbLayer)) {
+ // Is not an object
+ throw new NoObjectException($object, self::EXCEPTION_IS_NO_OBJECT);
+ } elseif (!method_exists($this->dbLayer, 'limitObject')) {
+ // Does not have the required instance
+ throw new MissingMethodException(array($this->dbLayer, 'limitObject'), self::EXCEPTION_MISSING_METHOD);
+ }
+
+ // For now we pipe this through to the real database instance
+ $this->dbLayer->limitObject($limitInstance);
+ }
+
+ /**
+ * Analyses if a unique ID has already been used or not. This method does
+ * only pass the given ID through to the "real" database layer.
+ *
+ * @param $uniqueID A unique ID number which shall be checked
+ * before it will be used
+ * @param $inConstructor If called from a constructor or from
+ * somewhere else
+ * @return $isUnused true = The unique ID was not found in the database,
+ * false = It is already in use by an other object
+ * @throws NullPointerException If $this->dbLayer is null
+ * @throws NoObjectException If $this->dbLayer is not an object
+ * @throws MissingMethodException If the required method
+ * isUniqueIdUsed() was not found
+ */
+ public final function isUniqueIdUsed ($uniqueID, $inConstructor = false) {
+ // Some sanity checks
+ if (is_null($this->dbLayer)) {
+ // Is null
+ throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
+ } elseif (!is_object($this->dbLayer)) {
+ // Is not an object
+ throw new NoObjectException($object, self::EXCEPTION_IS_NO_OBJECT);
+ } elseif (!method_exists($this->dbLayer, 'isUniqueIdUsed')) {
+ // Does not have the required instance
+ throw new MissingMethodException(array($this->dbLayer, 'isUniqueIdUsed'), self::EXCEPTION_MISSING_METHOD);
+ }
+
+ // Pass the returning result through
+ return $this->dbLayer->isUniqueIdUsed($uniqueID, $inConstructor);
+ }
+
+ /**
+ * Gets cached data from the database layer and if not found fetch it from
+ * the database again. This method does not return the header stuff because
+ * The underlaying database class will return only the requested content.
+ *
+ * @param $idNumber The ID number which we need for looking up
+ * the requested data
+ * @return $cachedArray The maybe cached data from the database
+ * @throws NullPointerException If $this->dbLayer is null
+ * @throws NoObjectException If $this->dbLayer is not an object
+ * @throws MissingMethodException If the required method
+ * isUniqueIdUsed() was not found
+ */
+ public final function getObjectFromCachedData ($idNumber) {
+ // Some sanity checks
+ if (is_null($this->dbLayer)) {
+ // Is null
+ throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
+ } elseif (!is_object($this->dbLayer)) {
+ // Is not an object
+ throw new NoObjectException($object, self::EXCEPTION_IS_NO_OBJECT);
+ } elseif (!method_exists($this->dbLayer, 'getObjectFromCachedData')) {
+ // Does not have the required instance
+ throw new MissingMethodException(array($this->dbLayer, 'getObjectFromCachedData'), self::EXCEPTION_MISSING_METHOD);
+ }
+
+ // Pass the returning result through
+ return $this->dbLayer->getObjectFromCachedData($idNumber);
+ }
+
+ /**
+ * Setter for the real database layer
+ * @param $dbLayer An instance of the real database layer
+ * @return void
+ */
+ public final function setDatabaseLayer (DatabaseFrontendInterface $dbLayer) {
+ $this->dbLayer = $dbLayer;
+ }
+}
+
+// [EOF]
+?>
projects / shipsimu.git / blobdiff