--- /dev/null
+<?php
+/**
+ * The middlware debug output system. A *real* or concrete output class shall
+ * become registered with this middleware because the back-fall class will
+ * become deprecated soon.
+ *
+ * @author Roland Haeder <webmaster@mxchange.org>
+ * @version 0.3.0
+ * @copyright Copyright(c) 2007, 2008 Roland Haeder, this is free software
+ * @license GNU GPL 3.0 or any newer version
+ * @link http://www.mxchange.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/>.
+ */
+class DebugMiddleware extends BaseMiddleware {
+ /**
+ * The concrete output instance
+ */
+ private $outputHandler = null;
+
+ /**
+ * An instance of this class
+ */
+ private static $thisInstance = null;
+
+ /**
+ * Private constructor
+ *
+ * @return void
+ */
+ private final function __construct () {
+ // Call parent constructor
+ parent::constructor(__CLASS__);
+
+ // Set description
+ $this->setPartDescr("Debug-Ausgabe-Handler");
+
+ // Create an unique ID
+ $this->createUniqueID();
+
+ // Set own instance
+ self::$thisInstance = $this;
+ }
+
+ /**
+ * Create a new debug output system.
+ * If no output is given this class is currently being used for back-fall.
+ * This fall-back mechanism will become deprecated very soon.
+ *
+ * @param $debuggerClass The class name which we shall use for
+ * registering the *real* debug output
+ * @return $debugInstance An instance of this middleware class
+ */
+ public final static function createDebugMiddleware ($debuggerClass) {
+ // Create an instance if this middleware
+ $debugInstance = new DebugMiddleware();
+
+ // Is there a valid output handler provided?
+ if ((!is_null($debuggerClass)) && (is_object($debuggerClass)) && (method_exists($debuggerClass, 'outputStream'))) {
+ // Use the given output system
+ $debugInstance->setOutputHandler($debuggerClass);
+ } elseif ((!is_null($debuggerClass)) && (is_string($debuggerClass)) && (class_exists($debuggerClass))) {
+ // A name for a debug output class has been provided so we try to get it
+ $eval = sprintf("\$debuggerClass = %s::create%s();",
+ $debuggerClass,
+ $debuggerClass
+ );
+
+ // Run the constructed name
+ @eval($eval);
+
+ // Was this successfull?
+ if ((is_object($debuggerClass)) && (method_exists($debuggerClass, "outputStream"))) {
+ // Set this as output class
+ $debugInstance->setOutputHandler($debuggerClass);
+ } else {
+ // No object or method is missing use fall-back
+ throw new MissingMethodException(array($debuggerClass, 'outputStream'), self::EXCEPTION_MISSING_METHOD);
+ }
+ }
+
+ // Return instance
+ return $debugInstance;
+ }
+
+ /**
+ * Getter for an instance of this class
+ *
+ * @return $thisInstance An instance of this class
+ */
+ public final static function getInstance() {
+ return self::$thisInstance;
+ }
+
+ /**
+ * Setter for output handler
+ *
+ * @return void
+ */
+ public final function setOutputHandler ($outputHandler) {
+ $this->outputHandler = $outputHandler;
+ }
+
+ /**
+ * This method shall send debug output which can be HTML code for the
+ * browser or debug lines for a log file, etc. to the registered debug
+ * output handler.
+ *
+ * @return void
+ */
+ public final function output ($outStream) {
+ // Check if the output handler is valid
+ if (is_null($this->outputHandler)) {
+ // Debug output handler was not set
+ throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
+ } elseif (!is_object($this->outputHandler)) {
+ // The debug output handler is not an object
+ throw new NoObjectException($this->ouputHandler, self::EXCEPTION_IS_NO_OBJECT);
+ } elseif (!method_exists($this->outputHandler, 'outputStream')) {
+ // The required method outputStream() is missing
+ throw new MissingMethodException(array($this->outputHandler, 'outputStream'), self::EXCEPTION_MISSING_METHOD);
+ }
+
+ // Is the output stream set
+ if (empty($outStream)) {
+ // Initialization phase
+ return;
+ }
+
+ // Use the output handler
+ $this->outputHandler->outputStream($outStream);
+ }
+}
+
+// [EOF]
+?>