1 files changed, 73 insertions, 9 deletions
diff --git a/libs/Zend/Exception.php b/libs/Zend/Exception.php
index 3cb5704b3f..bbfb792e93 100644
--- a/libs/Zend/Exception.php
+++ b/libs/Zend/Exception.php
@@ -14,18 +14,82 @@
  *
  * @category   Zend
  * @package    Zend
- * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
- * @version    $Id: Exception.php 16541 2009-07-07 06:59:03Z bkarwin $
  */
 
-
 /**
- * @category   Zend
- * @package    Zend
- * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
- * @license    http://framework.zend.com/license/new-bsd     New BSD License
- */
+* @category   Zend
+* @package    Zend
+* @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+* @license    http://framework.zend.com/license/new-bsd     New BSD License
+*/
 class Zend_Exception extends Exception
-{}
+{
+    /**
+     * @var null|Exception
+     */
+    private $_previous = null;
+
+    /**
+     * Construct the exception
+     *
+     * @param  string $msg
+     * @param  int $code
+     * @param  Exception $previous
+     * @return void
+     */
+    public function __construct($msg = '', $code = 0, Exception $previous = null)
+    {
+        if (version_compare(PHP_VERSION, '5.3.0', '<')) {
+            parent::__construct($msg, (int) $code);
+            $this->_previous = $previous;
+        } else {
+            parent::__construct($msg, (int) $code, $previous);
+        }
+    }
+
+    /**
+     * Overloading
+     *
+     * For PHP < 5.3.0, provides access to the getPrevious() method.
+     * 
+     * @param  string $method 
+     * @param  array $args 
+     * @return mixed
+     */
+    public function __call($method, array $args)
+    {
+        if ('getprevious' == strtolower($method)) {
+            return $this->_getPrevious();
+        }
+        return null;
+    }
+
+    /**
+     * String representation of the exception
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        if (version_compare(PHP_VERSION, '5.3.0', '<')) {
+            if (null !== ($e = $this->getPrevious())) {
+                return $e->__toString() 
+                       . "\n\nNext " 
+                       . parent::__toString();
+            }
+        }
+        return parent::__toString();
+    }
 
+    /**
+     * Returns previous Exception
+     *
+     * @return Exception|null
+     */
+    protected function _getPrevious()
+    {
+        return $this->_previous;
+    }
+}