standardize the use of unix eol; use svn properties to enforce native eol

2 files changed, 829 insertions, 829 deletions

diff --git a/framework/Exceptions/TErrorHandler.php b/framework/Exceptions/TErrorHandler.php
index 7940fcae..f105cd1a 100644
--- a/framework/Exceptions/TErrorHandler.php
+++ b/framework/Exceptions/TErrorHandler.php
@@ -1,413 +1,413 @@
-<?php

-/**

- * TErrorHandler class file

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @link http://www.pradosoft.com/

- * @copyright Copyright &copy; 2005-2012 PradoSoft

- * @license http://www.pradosoft.com/license/

- * @version $Id$

- * @package System.Exceptions

- */

-

-/**

- * TErrorHandler class

- *

- * TErrorHandler handles all PHP user errors and exceptions generated during

- * servicing user requests. It displays these errors using different templates

- * and if possible, using languages preferred by the client user.

- * Note, PHP parsing errors cannot be caught and handled by TErrorHandler.

- *

- * The templates used to format the error output are stored under System.Exceptions.

- * You may choose to use your own templates, should you not like the templates

- * provided by Prado. Simply set {@link setErrorTemplatePath ErrorTemplatePath}

- * to the path (in namespace format) storing your own templates.

- *

- * There are two sets of templates, one for errors to be displayed to client users

- * (called external errors), one for errors to be displayed to system developers

- * (called internal errors). The template file name for the former is

- * <b>error[StatusCode][-LanguageCode].html</b>, and for the latter it is

- * <b>exception[-LanguageCode].html</b>, where StatusCode refers to response status

- * code (e.g. 404, 500) specified when {@link THttpException} is thrown,

- * and LanguageCode is the client user preferred language code (e.g. en, zh, de).

- * The templates <b>error.html</b> and <b>exception.html</b> are default ones

- * that are used if no other appropriate templates are available.

- * Note, these templates are not Prado control templates. They are simply

- * html files with keywords (e.g. %%ErrorMessage%%, %%Version%%)

- * to be replaced with the corresponding information.

- *

- * By default, TErrorHandler is registered with {@link TApplication} as the

- * error handler module. It can be accessed via {@link TApplication::getErrorHandler()}.

- * You seldom need to deal with the error handler directly. It is mainly used

- * by the application object to handle errors.

- *

- * TErrorHandler may be configured in application configuration file as follows

- * <module id="error" class="TErrorHandler" ErrorTemplatePath="System.Exceptions" />

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TErrorHandler extends TModule

-{

-	/**

-	 * error template file basename

-	 */

-	const ERROR_FILE_NAME='error';

-	/**

-	 * exception template file basename

-	 */

-	const EXCEPTION_FILE_NAME='exception';

-	/**

-	 * number of lines before and after the error line to be displayed in case of an exception

-	 */

-	const SOURCE_LINES=12;

-

-	/**

-	 * @var string error template directory

-	 */

-	private $_templatePath=null;

-

-	/**

-	 * Initializes the module.

-	 * This method is required by IModule and is invoked by application.

-	 * @param TXmlElement module configuration

-	 */

-	public function init($config)

-	{

-		$this->getApplication()->setErrorHandler($this);

-	}

-

-	/**

-	 * @return string the directory containing error template files.

-	 */

-	public function getErrorTemplatePath()

-	{

-		if($this->_templatePath===null)

-			$this->_templatePath=Prado::getFrameworkPath().'/Exceptions/templates';

-		return $this->_templatePath;

-	}

-

-	/**

-	 * Sets the path storing all error and exception template files.

-	 * The path must be in namespace format, such as System.Exceptions (which is the default).

-	 * @param string template path in namespace format

-	 * @throws TConfigurationException if the template path is invalid

-	 */

-	public function setErrorTemplatePath($value)

-	{

-		if(($templatePath=Prado::getPathOfNamespace($value))!==null && is_dir($templatePath))

-			$this->_templatePath=$templatePath;

-		else

-			throw new TConfigurationException('errorhandler_errortemplatepath_invalid',$value);

-	}

-

-	/**

-	 * Handles PHP user errors and exceptions.

-	 * This is the event handler responding to the <b>Error</b> event

-	 * raised in {@link TApplication}.

-	 * The method mainly uses appropriate template to display the error/exception.

-	 * It terminates the application immediately after the error is displayed.

-	 * @param mixed sender of the event

-	 * @param mixed event parameter (if the event is raised by TApplication, it refers to the exception instance)

-	 */

-	public function handleError($sender,$param)

-	{

-		static $handling=false;

-		// We need to restore error and exception handlers,

-		// because within error and exception handlers, new errors and exceptions

-		// cannot be handled properly by PHP

-		restore_error_handler();

-		restore_exception_handler();

-		// ensure that we do not enter infinite loop of error handling

-		if($handling)

-			$this->handleRecursiveError($param);

-		else

-		{

-			$handling=true;

-			if(($response=$this->getResponse())!==null)

-				$response->clear();

-			if(!headers_sent())

-				header('Content-Type: text/html; charset=UTF-8');

-			if($param instanceof THttpException)

-				$this->handleExternalError($param->getStatusCode(),$param);

-			else if($this->getApplication()->getMode()===TApplicationMode::Debug)

-				$this->displayException($param);

-			else

-				$this->handleExternalError(500,$param);

-		}

-	}

-

-

-	/**

-	 * @param string $value

-	 * @param Exception|null$exception

-	 * @return string

-	 * @since 3.1.6

-	 */

-	protected static function hideSecurityRelated($value, $exception=null)

-	{

-		$aRpl = array();

-		if($exception !== null && $exception instanceof Exception)

-		{

-			$aTrace = $exception->getTrace();

-			foreach($aTrace as $item)

-			{

-				if(isset($item['file']))

-					$aRpl[dirname($item['file']) . DIRECTORY_SEPARATOR] = '<hidden>' . DIRECTORY_SEPARATOR;

-			}

-		}

-		$aRpl[$_SERVER['DOCUMENT_ROOT']] = '${DocumentRoot}';

-		$aRpl[str_replace('/', DIRECTORY_SEPARATOR, $_SERVER['DOCUMENT_ROOT'])] = '${DocumentRoot}';

-		$aRpl[PRADO_DIR . DIRECTORY_SEPARATOR] = '${PradoFramework}' . DIRECTORY_SEPARATOR;

-		if(isset($aRpl[DIRECTORY_SEPARATOR])) unset($aRpl[DIRECTORY_SEPARATOR]);

-		$aRpl = array_reverse($aRpl, true);

-

-		return str_replace(array_keys($aRpl), $aRpl, $value);

-	}

-

-	/**

-	 * Displays error to the client user.

-	 * THttpException and errors happened when the application is in <b>Debug</b>

-	 * mode will be displayed to the client user.

-	 * @param integer response status code

-	 * @param Exception exception instance

-	 */

-	protected function handleExternalError($statusCode,$exception)

-	{

-		if(!($exception instanceof THttpException))

-			error_log($exception->__toString());

-

-		$content=$this->getErrorTemplate($statusCode,$exception);

-

-		$serverAdmin=isset($_SERVER['SERVER_ADMIN'])?$_SERVER['SERVER_ADMIN']:'';

-

-		$isDebug = $this->getApplication()->getMode()===TApplicationMode::Debug;

-

-		$errorMessage = $exception->getMessage();

-		if($isDebug)

-			$version=$_SERVER['SERVER_SOFTWARE'].' <a href="http://www.pradosoft.com/">PRADO</a>/'.Prado::getVersion();

-		else

-		{

-			$version='';

-			$errorMessage = self::hideSecurityRelated($errorMessage, $exception);

-		}

-		$tokens=array(

-			'%%StatusCode%%' => "$statusCode",

-			'%%ErrorMessage%%' => htmlspecialchars($errorMessage),

-			'%%ServerAdmin%%' => $serverAdmin,

-			'%%Version%%' => $version,

-			'%%Time%%' => @strftime('%Y-%m-%d %H:%M',time())

-		);

-

-		$CGI=substr(php_sapi_name(), 0, 3) == 'cgi'; // FastCGI / IIS

-		if($isDebug)

-		{

-			if ($CGI)

-				header("Status: $statusCode ".$exception->getMessage(), true, TPropertyValue::ensureInteger($statusCode));

-			else

-				header("HTTP/1.0 $statusCode ".$exception->getMessage(), true, TPropertyValue::ensureInteger($statusCode));

-		} else {

-			if ($CGI)

-				header("Status: $statusCode", true, TPropertyValue::ensureInteger($statusCode));

-			else

-				header("HTTP/1.0 $statusCode", true, TPropertyValue::ensureInteger($statusCode));

-		}

-

-		echo strtr($content,$tokens);

-	}

-

-	/**

-	 * Handles error occurs during error handling (called recursive error).

-	 * THttpException and errors happened when the application is in <b>Debug</b>

-	 * mode will be displayed to the client user.

-	 * Error is displayed without using existing template to prevent further errors.

-	 * @param Exception exception instance

-	 */

-	protected function handleRecursiveError($exception)

-	{

-		if($this->getApplication()->getMode()===TApplicationMode::Debug)

-		{

-			echo "<html><head><title>Recursive Error</title></head>\n";

-			echo "<body><h1>Recursive Error</h1>\n";

-			echo "<pre>".$exception->__toString()."</pre>\n";

-			echo "</body></html>";

-		}

-		else

-		{

-			error_log("Error happened while processing an existing error:\n".$exception->__toString());

-			header('HTTP/1.0 500 Internal Error');

-		}

-	}

-

-	/**

-	 * Displays exception information.

-	 * Exceptions are displayed with rich context information, including

-	 * the call stack and the context source code.

-	 * This method is only invoked when application is in <b>Debug</b> mode.

-	 * @param Exception exception instance

-	 */

-	protected function displayException($exception)

-	{

-		if(php_sapi_name()==='cli')

-		{

-			echo $exception->getMessage()."\n";

-			echo $exception->getTraceAsString();

-			return;

-		}

-

-		if($exception instanceof TTemplateException)

-		{

-			$fileName=$exception->getTemplateFile();

-			$lines=empty($fileName)?explode("\n",$exception->getTemplateSource()):@file($fileName);

-			$source=$this->getSourceCode($lines,$exception->getLineNumber());

-			if($fileName==='')

-				$fileName='---embedded template---';

-			$errorLine=$exception->getLineNumber();

-		}

-		else

-		{

-			if(($trace=$this->getExactTrace($exception))!==null)

-			{

-				$fileName=$trace['file'];

-				$errorLine=$trace['line'];

-			}

-			else

-			{

-				$fileName=$exception->getFile();

-				$errorLine=$exception->getLine();

-			}

-			$source=$this->getSourceCode(@file($fileName),$errorLine);

-		}

-

-		if($this->getApplication()->getMode()===TApplicationMode::Debug)

-			$version=$_SERVER['SERVER_SOFTWARE'].' <a href="http://www.pradosoft.com/">PRADO</a>/'.Prado::getVersion();

-		else

-			$version='';

-

-		$tokens=array(

-			'%%ErrorType%%' => get_class($exception),

-			'%%ErrorMessage%%' => $this->addLink(htmlspecialchars($exception->getMessage())),

-			'%%SourceFile%%' => htmlspecialchars($fileName).' ('.$errorLine.')',

-			'%%SourceCode%%' => $source,

-			'%%StackTrace%%' => htmlspecialchars($exception->getTraceAsString()),

-			'%%Version%%' => $version,

-			'%%Time%%' => @strftime('%Y-%m-%d %H:%M',time())

-		);

-

-		$content=$this->getExceptionTemplate($exception);

-

-		echo strtr($content,$tokens);

-	}

-

-	/**

-	 * Retrieves the template used for displaying internal exceptions.

-	 * Internal exceptions will be displayed with source code causing the exception.

-	 * This occurs when the application is in debug mode.

-	 * @param Exception the exception to be displayed

-	 * @return string the template content

-	 */

-	protected function getExceptionTemplate($exception)

-	{

-		$lang=Prado::getPreferredLanguage();

-		$exceptionFile=Prado::getFrameworkPath().'/Exceptions/templates/'.self::EXCEPTION_FILE_NAME.'-'.$lang.'.html';

-		if(!is_file($exceptionFile))

-			$exceptionFile=Prado::getFrameworkPath().'/Exceptions/templates/'.self::EXCEPTION_FILE_NAME.'.html';

-		if(($content=@file_get_contents($exceptionFile))===false)

-			die("Unable to open exception template file '$exceptionFile'.");

-		return $content;

-	}

-

-	/**

-	 * Retrieves the template used for displaying external exceptions.

-	 * External exceptions are those displayed to end-users. They do not contain

-	 * error source code. Therefore, you might want to override this method

-	 * to provide your own error template for displaying certain external exceptions.

-	 * The following tokens in the template will be replaced with corresponding content:

-	 * %%StatusCode%% : the status code of the exception

-	 * %%ErrorMessage%% : the error message (HTML encoded).

-	 * %%ServerAdmin%% : the server admin information (retrieved from Web server configuration)

-	 * %%Version%% : the version information of the Web server.

-	 * %%Time%% : the time the exception occurs at

-	 *

-	 * @param integer status code (such as 404, 500, etc.)

-	 * @param Exception the exception to be displayed

-	 * @return string the template content

-	 */

-	protected function getErrorTemplate($statusCode,$exception)

-	{

-		$base=$this->getErrorTemplatePath().DIRECTORY_SEPARATOR.self::ERROR_FILE_NAME;

-		$lang=Prado::getPreferredLanguage();

-		if(is_file("$base$statusCode-$lang.html"))

-			$errorFile="$base$statusCode-$lang.html";

-		else if(is_file("$base$statusCode.html"))

-			$errorFile="$base$statusCode.html";

-		else if(is_file("$base-$lang.html"))

-			$errorFile="$base-$lang.html";

-		else

-			$errorFile="$base.html";

-		if(($content=@file_get_contents($errorFile))===false)

-			die("Unable to open error template file '$errorFile'.");

-		return $content;

-	}

-

-	private function getExactTrace($exception)

-	{

-		$trace=$exception->getTrace();

-		$result=null;

-		// if PHP exception, we want to show the 2nd stack level context

-		// because the 1st stack level is of little use (it's in error handler)

-		if($exception instanceof TPhpErrorException)

-			$result=isset($trace[0]['file'])?$trace[0]:$trace[1];

-		else if($exception instanceof TInvalidOperationException)

-		{

-			// in case of getter or setter error, find out the exact file and row

-			if(($result=$this->getPropertyAccessTrace($trace,'__get'))===null)

-				$result=$this->getPropertyAccessTrace($trace,'__set');

-		}

-		if($result!==null && strpos($result['file'],': eval()\'d code')!==false)

-			return null;

-

-		return $result;

-	}

-

-	private function getPropertyAccessTrace($trace,$pattern)

-	{

-		$result=null;

-		foreach($trace as $t)

-		{

-			if(isset($t['function']) && $t['function']===$pattern)

-				$result=$t;

-			else

-				break;

-		}

-		return $result;

-	}

-

-	private function getSourceCode($lines,$errorLine)

-	{

-		$beginLine=$errorLine-self::SOURCE_LINES>=0?$errorLine-self::SOURCE_LINES:0;

-		$endLine=$errorLine+self::SOURCE_LINES<=count($lines)?$errorLine+self::SOURCE_LINES:count($lines);

-

-		$source='';

-		for($i=$beginLine;$i<$endLine;++$i)

-		{

-			if($i===$errorLine-1)

-			{

-				$line=htmlspecialchars(sprintf("%04d: %s",$i+1,str_replace("\t",'    ',$lines[$i])));

-				$source.="<div class=\"error\">".$line."</div>";

-			}

-			else

-				$source.=htmlspecialchars(sprintf("%04d: %s",$i+1,str_replace("\t",'    ',$lines[$i])));

-		}

-		return $source;

-	}

-

-	private function addLink($message)

-	{

-		$baseUrl='http://www.pradosoft.com/docs/classdoc';

-		return preg_replace('/\b(T[A-Z]\w+)\b/',"<a href=\"$baseUrl/\${1}\" target=\"_blank\">\${1}</a>",$message);

-	}

-}

-

+<?php
+/**
+ * TErrorHandler class file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
+ * @copyright Copyright &copy; 2005-2012 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Id$
+ * @package System.Exceptions
+ */
+
+/**
+ * TErrorHandler class
+ *
+ * TErrorHandler handles all PHP user errors and exceptions generated during
+ * servicing user requests. It displays these errors using different templates
+ * and if possible, using languages preferred by the client user.
+ * Note, PHP parsing errors cannot be caught and handled by TErrorHandler.
+ *
+ * The templates used to format the error output are stored under System.Exceptions.
+ * You may choose to use your own templates, should you not like the templates
+ * provided by Prado. Simply set {@link setErrorTemplatePath ErrorTemplatePath}
+ * to the path (in namespace format) storing your own templates.
+ *
+ * There are two sets of templates, one for errors to be displayed to client users
+ * (called external errors), one for errors to be displayed to system developers
+ * (called internal errors). The template file name for the former is
+ * <b>error[StatusCode][-LanguageCode].html</b>, and for the latter it is
+ * <b>exception[-LanguageCode].html</b>, where StatusCode refers to response status
+ * code (e.g. 404, 500) specified when {@link THttpException} is thrown,
+ * and LanguageCode is the client user preferred language code (e.g. en, zh, de).
+ * The templates <b>error.html</b> and <b>exception.html</b> are default ones
+ * that are used if no other appropriate templates are available.
+ * Note, these templates are not Prado control templates. They are simply
+ * html files with keywords (e.g. %%ErrorMessage%%, %%Version%%)
+ * to be replaced with the corresponding information.
+ *
+ * By default, TErrorHandler is registered with {@link TApplication} as the
+ * error handler module. It can be accessed via {@link TApplication::getErrorHandler()}.
+ * You seldom need to deal with the error handler directly. It is mainly used
+ * by the application object to handle errors.
+ *
+ * TErrorHandler may be configured in application configuration file as follows
+ * <module id="error" class="TErrorHandler" ErrorTemplatePath="System.Exceptions" />
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TErrorHandler extends TModule
+{
+	/**
+	 * error template file basename
+	 */
+	const ERROR_FILE_NAME='error';
+	/**
+	 * exception template file basename
+	 */
+	const EXCEPTION_FILE_NAME='exception';
+	/**
+	 * number of lines before and after the error line to be displayed in case of an exception
+	 */
+	const SOURCE_LINES=12;
+
+	/**
+	 * @var string error template directory
+	 */
+	private $_templatePath=null;
+
+	/**
+	 * Initializes the module.
+	 * This method is required by IModule and is invoked by application.
+	 * @param TXmlElement module configuration
+	 */
+	public function init($config)
+	{
+		$this->getApplication()->setErrorHandler($this);
+	}
+
+	/**
+	 * @return string the directory containing error template files.
+	 */
+	public function getErrorTemplatePath()
+	{
+		if($this->_templatePath===null)
+			$this->_templatePath=Prado::getFrameworkPath().'/Exceptions/templates';
+		return $this->_templatePath;
+	}
+
+	/**
+	 * Sets the path storing all error and exception template files.
+	 * The path must be in namespace format, such as System.Exceptions (which is the default).
+	 * @param string template path in namespace format
+	 * @throws TConfigurationException if the template path is invalid
+	 */
+	public function setErrorTemplatePath($value)
+	{
+		if(($templatePath=Prado::getPathOfNamespace($value))!==null && is_dir($templatePath))
+			$this->_templatePath=$templatePath;
+		else
+			throw new TConfigurationException('errorhandler_errortemplatepath_invalid',$value);
+	}
+
+	/**
+	 * Handles PHP user errors and exceptions.
+	 * This is the event handler responding to the <b>Error</b> event
+	 * raised in {@link TApplication}.
+	 * The method mainly uses appropriate template to display the error/exception.
+	 * It terminates the application immediately after the error is displayed.
+	 * @param mixed sender of the event
+	 * @param mixed event parameter (if the event is raised by TApplication, it refers to the exception instance)
+	 */
+	public function handleError($sender,$param)
+	{
+		static $handling=false;
+		// We need to restore error and exception handlers,
+		// because within error and exception handlers, new errors and exceptions
+		// cannot be handled properly by PHP
+		restore_error_handler();
+		restore_exception_handler();
+		// ensure that we do not enter infinite loop of error handling
+		if($handling)
+			$this->handleRecursiveError($param);
+		else
+		{
+			$handling=true;
+			if(($response=$this->getResponse())!==null)
+				$response->clear();
+			if(!headers_sent())
+				header('Content-Type: text/html; charset=UTF-8');
+			if($param instanceof THttpException)
+				$this->handleExternalError($param->getStatusCode(),$param);
+			else if($this->getApplication()->getMode()===TApplicationMode::Debug)
+				$this->displayException($param);
+			else
+				$this->handleExternalError(500,$param);
+		}
+	}
+
+
+	/**
+	 * @param string $value
+	 * @param Exception|null$exception
+	 * @return string
+	 * @since 3.1.6
+	 */
+	protected static function hideSecurityRelated($value, $exception=null)
+	{
+		$aRpl = array();
+		if($exception !== null && $exception instanceof Exception)
+		{
+			$aTrace = $exception->getTrace();
+			foreach($aTrace as $item)
+			{
+				if(isset($item['file']))
+					$aRpl[dirname($item['file']) . DIRECTORY_SEPARATOR] = '<hidden>' . DIRECTORY_SEPARATOR;
+			}
+		}
+		$aRpl[$_SERVER['DOCUMENT_ROOT']] = '${DocumentRoot}';
+		$aRpl[str_replace('/', DIRECTORY_SEPARATOR, $_SERVER['DOCUMENT_ROOT'])] = '${DocumentRoot}';
+		$aRpl[PRADO_DIR . DIRECTORY_SEPARATOR] = '${PradoFramework}' . DIRECTORY_SEPARATOR;
+		if(isset($aRpl[DIRECTORY_SEPARATOR])) unset($aRpl[DIRECTORY_SEPARATOR]);
+		$aRpl = array_reverse($aRpl, true);
+
+		return str_replace(array_keys($aRpl), $aRpl, $value);
+	}
+
+	/**
+	 * Displays error to the client user.
+	 * THttpException and errors happened when the application is in <b>Debug</b>
+	 * mode will be displayed to the client user.
+	 * @param integer response status code
+	 * @param Exception exception instance
+	 */
+	protected function handleExternalError($statusCode,$exception)
+	{
+		if(!($exception instanceof THttpException))
+			error_log($exception->__toString());
+
+		$content=$this->getErrorTemplate($statusCode,$exception);
+
+		$serverAdmin=isset($_SERVER['SERVER_ADMIN'])?$_SERVER['SERVER_ADMIN']:'';
+
+		$isDebug = $this->getApplication()->getMode()===TApplicationMode::Debug;
+
+		$errorMessage = $exception->getMessage();
+		if($isDebug)
+			$version=$_SERVER['SERVER_SOFTWARE'].' <a href="http://www.pradosoft.com/">PRADO</a>/'.Prado::getVersion();
+		else
+		{
+			$version='';
+			$errorMessage = self::hideSecurityRelated($errorMessage, $exception);
+		}
+		$tokens=array(
+			'%%StatusCode%%' => "$statusCode",
+			'%%ErrorMessage%%' => htmlspecialchars($errorMessage),
+			'%%ServerAdmin%%' => $serverAdmin,
+			'%%Version%%' => $version,
+			'%%Time%%' => @strftime('%Y-%m-%d %H:%M',time())
+		);
+
+		$CGI=substr(php_sapi_name(), 0, 3) == 'cgi'; // FastCGI / IIS
+		if($isDebug)
+		{
+			if ($CGI)
+				header("Status: $statusCode ".$exception->getMessage(), true, TPropertyValue::ensureInteger($statusCode));
+			else
+				header("HTTP/1.0 $statusCode ".$exception->getMessage(), true, TPropertyValue::ensureInteger($statusCode));
+		} else {
+			if ($CGI)
+				header("Status: $statusCode", true, TPropertyValue::ensureInteger($statusCode));
+			else
+				header("HTTP/1.0 $statusCode", true, TPropertyValue::ensureInteger($statusCode));
+		}
+
+		echo strtr($content,$tokens);
+	}
+
+	/**
+	 * Handles error occurs during error handling (called recursive error).
+	 * THttpException and errors happened when the application is in <b>Debug</b>
+	 * mode will be displayed to the client user.
+	 * Error is displayed without using existing template to prevent further errors.
+	 * @param Exception exception instance
+	 */
+	protected function handleRecursiveError($exception)
+	{
+		if($this->getApplication()->getMode()===TApplicationMode::Debug)
+		{
+			echo "<html><head><title>Recursive Error</title></head>\n";
+			echo "<body><h1>Recursive Error</h1>\n";
+			echo "<pre>".$exception->__toString()."</pre>\n";
+			echo "</body></html>";
+		}
+		else
+		{
+			error_log("Error happened while processing an existing error:\n".$exception->__toString());
+			header('HTTP/1.0 500 Internal Error');
+		}
+	}
+
+	/**
+	 * Displays exception information.
+	 * Exceptions are displayed with rich context information, including
+	 * the call stack and the context source code.
+	 * This method is only invoked when application is in <b>Debug</b> mode.
+	 * @param Exception exception instance
+	 */
+	protected function displayException($exception)
+	{
+		if(php_sapi_name()==='cli')
+		{
+			echo $exception->getMessage()."\n";
+			echo $exception->getTraceAsString();
+			return;
+		}
+
+		if($exception instanceof TTemplateException)
+		{
+			$fileName=$exception->getTemplateFile();
+			$lines=empty($fileName)?explode("\n",$exception->getTemplateSource()):@file($fileName);
+			$source=$this->getSourceCode($lines,$exception->getLineNumber());
+			if($fileName==='')
+				$fileName='---embedded template---';
+			$errorLine=$exception->getLineNumber();
+		}
+		else
+		{
+			if(($trace=$this->getExactTrace($exception))!==null)
+			{
+				$fileName=$trace['file'];
+				$errorLine=$trace['line'];
+			}
+			else
+			{
+				$fileName=$exception->getFile();
+				$errorLine=$exception->getLine();
+			}
+			$source=$this->getSourceCode(@file($fileName),$errorLine);
+		}
+
+		if($this->getApplication()->getMode()===TApplicationMode::Debug)
+			$version=$_SERVER['SERVER_SOFTWARE'].' <a href="http://www.pradosoft.com/">PRADO</a>/'.Prado::getVersion();
+		else
+			$version='';
+
+		$tokens=array(
+			'%%ErrorType%%' => get_class($exception),
+			'%%ErrorMessage%%' => $this->addLink(htmlspecialchars($exception->getMessage())),
+			'%%SourceFile%%' => htmlspecialchars($fileName).' ('.$errorLine.')',
+			'%%SourceCode%%' => $source,
+			'%%StackTrace%%' => htmlspecialchars($exception->getTraceAsString()),
+			'%%Version%%' => $version,
+			'%%Time%%' => @strftime('%Y-%m-%d %H:%M',time())
+		);
+
+		$content=$this->getExceptionTemplate($exception);
+
+		echo strtr($content,$tokens);
+	}
+
+	/**
+	 * Retrieves the template used for displaying internal exceptions.
+	 * Internal exceptions will be displayed with source code causing the exception.
+	 * This occurs when the application is in debug mode.
+	 * @param Exception the exception to be displayed
+	 * @return string the template content
+	 */
+	protected function getExceptionTemplate($exception)
+	{
+		$lang=Prado::getPreferredLanguage();
+		$exceptionFile=Prado::getFrameworkPath().'/Exceptions/templates/'.self::EXCEPTION_FILE_NAME.'-'.$lang.'.html';
+		if(!is_file($exceptionFile))
+			$exceptionFile=Prado::getFrameworkPath().'/Exceptions/templates/'.self::EXCEPTION_FILE_NAME.'.html';
+		if(($content=@file_get_contents($exceptionFile))===false)
+			die("Unable to open exception template file '$exceptionFile'.");
+		return $content;
+	}
+
+	/**
+	 * Retrieves the template used for displaying external exceptions.
+	 * External exceptions are those displayed to end-users. They do not contain
+	 * error source code. Therefore, you might want to override this method
+	 * to provide your own error template for displaying certain external exceptions.
+	 * The following tokens in the template will be replaced with corresponding content:
+	 * %%StatusCode%% : the status code of the exception
+	 * %%ErrorMessage%% : the error message (HTML encoded).
+	 * %%ServerAdmin%% : the server admin information (retrieved from Web server configuration)
+	 * %%Version%% : the version information of the Web server.
+	 * %%Time%% : the time the exception occurs at
+	 *
+	 * @param integer status code (such as 404, 500, etc.)
+	 * @param Exception the exception to be displayed
+	 * @return string the template content
+	 */
+	protected function getErrorTemplate($statusCode,$exception)
+	{
+		$base=$this->getErrorTemplatePath().DIRECTORY_SEPARATOR.self::ERROR_FILE_NAME;
+		$lang=Prado::getPreferredLanguage();
+		if(is_file("$base$statusCode-$lang.html"))
+			$errorFile="$base$statusCode-$lang.html";
+		else if(is_file("$base$statusCode.html"))
+			$errorFile="$base$statusCode.html";
+		else if(is_file("$base-$lang.html"))
+			$errorFile="$base-$lang.html";
+		else
+			$errorFile="$base.html";
+		if(($content=@file_get_contents($errorFile))===false)
+			die("Unable to open error template file '$errorFile'.");
+		return $content;
+	}
+
+	private function getExactTrace($exception)
+	{
+		$trace=$exception->getTrace();
+		$result=null;
+		// if PHP exception, we want to show the 2nd stack level context
+		// because the 1st stack level is of little use (it's in error handler)
+		if($exception instanceof TPhpErrorException)
+			$result=isset($trace[0]['file'])?$trace[0]:$trace[1];
+		else if($exception instanceof TInvalidOperationException)
+		{
+			// in case of getter or setter error, find out the exact file and row
+			if(($result=$this->getPropertyAccessTrace($trace,'__get'))===null)
+				$result=$this->getPropertyAccessTrace($trace,'__set');
+		}
+		if($result!==null && strpos($result['file'],': eval()\'d code')!==false)
+			return null;
+
+		return $result;
+	}
+
+	private function getPropertyAccessTrace($trace,$pattern)
+	{
+		$result=null;
+		foreach($trace as $t)
+		{
+			if(isset($t['function']) && $t['function']===$pattern)
+				$result=$t;
+			else
+				break;
+		}
+		return $result;
+	}
+
+	private function getSourceCode($lines,$errorLine)
+	{
+		$beginLine=$errorLine-self::SOURCE_LINES>=0?$errorLine-self::SOURCE_LINES:0;
+		$endLine=$errorLine+self::SOURCE_LINES<=count($lines)?$errorLine+self::SOURCE_LINES:count($lines);
+
+		$source='';
+		for($i=$beginLine;$i<$endLine;++$i)
+		{
+			if($i===$errorLine-1)
+			{
+				$line=htmlspecialchars(sprintf("%04d: %s",$i+1,str_replace("\t",'    ',$lines[$i])));
+				$source.="<div class=\"error\">".$line."</div>";
+			}
+			else
+				$source.=htmlspecialchars(sprintf("%04d: %s",$i+1,str_replace("\t",'    ',$lines[$i])));
+		}
+		return $source;
+	}
+
+	private function addLink($message)
+	{
+		$baseUrl='http://www.pradosoft.com/docs/classdoc';
+		return preg_replace('/\b(T[A-Z]\w+)\b/',"<a href=\"$baseUrl/\${1}\" target=\"_blank\">\${1}</a>",$message);
+	}
+}
+
diff --git a/framework/Exceptions/TException.php b/framework/Exceptions/TException.php
index 5e266e17..c9f9d530 100644
--- a/framework/Exceptions/TException.php
+++ b/framework/Exceptions/TException.php
@@ -1,424 +1,424 @@
-<?php

-/**

- * Exception classes file

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @link http://www.pradosoft.com/

+<?php
+/**
+ * Exception classes file
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.pradosoft.com/
  * @copyright Copyright &copy; 2005-2012 PradoSoft
- * @license http://www.pradosoft.com/license/

- * @version $Id$

- * @package System.Exceptions

- */

-

-/**

- * TException class

- *

- * TException is the base class for all PRADO exceptions.

- *

- * TException provides the functionality of translating an error code

- * into a descriptive error message in a language that is preferred

- * by user browser. Additional parameters may be passed together with

- * the error code so that the translated message contains more detailed

- * information.

- *

- * By default, TException looks for a message file by calling

- * {@link getErrorMessageFile()} method, which uses the "message-xx.txt"

- * file located under "System.Exceptions" folder, where "xx" is the

- * code of the user preferred language. If such a file is not found,

- * "message.txt" will be used instead.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TException extends Exception

-{

-	private $_errorCode='';

+ * @license http://www.pradosoft.com/license/
+ * @version $Id$
+ * @package System.Exceptions
+ */
+
+/**
+ * TException class
+ *
+ * TException is the base class for all PRADO exceptions.
+ *
+ * TException provides the functionality of translating an error code
+ * into a descriptive error message in a language that is preferred
+ * by user browser. Additional parameters may be passed together with
+ * the error code so that the translated message contains more detailed
+ * information.
+ *
+ * By default, TException looks for a message file by calling
+ * {@link getErrorMessageFile()} method, which uses the "message-xx.txt"
+ * file located under "System.Exceptions" folder, where "xx" is the
+ * code of the user preferred language. If such a file is not found,
+ * "message.txt" will be used instead.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TException extends Exception
+{
+	private $_errorCode='';
 	static $_messageCache=array();
-

-	/**

-	 * Constructor.

-	 * @param string error message. This can be a string that is listed

-	 * in the message file. If so, the message in the preferred language

-	 * will be used as the error message. Any rest parameters will be used

-	 * to replace placeholders ({0}, {1}, {2}, etc.) in the message.

-	 */

-	public function __construct($errorMessage)

-	{

-		$this->_errorCode=$errorMessage;

-		$errorMessage=$this->translateErrorMessage($errorMessage);

-		$args=func_get_args();

-		array_shift($args);

-		$n=count($args);

-		$tokens=array();

-		for($i=0;$i<$n;++$i)

-			$tokens['{'.$i.'}']=TPropertyValue::ensureString($args[$i]);

-		parent::__construct(strtr($errorMessage,$tokens));

-	}

-

-	/**

-	 * Translates an error code into an error message.

-	 * @param string error code that is passed in the exception constructor.

-	 * @return string the translated error message

-	 */

-	protected function translateErrorMessage($key)

-	{

-		$msgFile=$this->getErrorMessageFile();

+
+	/**
+	 * Constructor.
+	 * @param string error message. This can be a string that is listed
+	 * in the message file. If so, the message in the preferred language
+	 * will be used as the error message. Any rest parameters will be used
+	 * to replace placeholders ({0}, {1}, {2}, etc.) in the message.
+	 */
+	public function __construct($errorMessage)
+	{
+		$this->_errorCode=$errorMessage;
+		$errorMessage=$this->translateErrorMessage($errorMessage);
+		$args=func_get_args();
+		array_shift($args);
+		$n=count($args);
+		$tokens=array();
+		for($i=0;$i<$n;++$i)
+			$tokens['{'.$i.'}']=TPropertyValue::ensureString($args[$i]);
+		parent::__construct(strtr($errorMessage,$tokens));
+	}
+
+	/**
+	 * Translates an error code into an error message.
+	 * @param string error code that is passed in the exception constructor.
+	 * @return string the translated error message
+	 */
+	protected function translateErrorMessage($key)
+	{
+		$msgFile=$this->getErrorMessageFile();
 
 		// Cache messages
 		if (!isset(self::$_messageCache[$msgFile])) 
 		{
-			if(($entries=@file($msgFile))!==false)

-			{

-				foreach($entries as $entry)

-				{

-					@list($code,$message)=explode('=',$entry,2);

+			if(($entries=@file($msgFile))!==false)
+			{
+				foreach($entries as $entry)
+				{
+					@list($code,$message)=explode('=',$entry,2);
 					self::$_messageCache[$msgFile][trim($code)]=trim($message);
-				}

-			}

+				}
+			}
 		}
-		return isset(self::$_messageCache[$msgFile][$key]) ? self::$_messageCache[$msgFile][$key] : $key;

-	}

-

-	/**

-	 * @return string path to the error message file

-	 */

-	protected function getErrorMessageFile()

-	{

-		$lang=Prado::getPreferredLanguage();

-		$msgFile=Prado::getFrameworkPath().'/Exceptions/messages/messages-'.$lang.'.txt';

-		if(!is_file($msgFile))

-			$msgFile=Prado::getFrameworkPath().'/Exceptions/messages/messages.txt';

-		return $msgFile;

-	}

-

-	/**

-	 * @return string error code

-	 */

-	public function getErrorCode()

-	{

-		return $this->_errorCode;

-	}

-

-	/**

-	 * @param string error code

-	 */

-	public function setErrorCode($code)

-	{

-		$this->_errorCode=$code;

-	}

-

-	/**

-	 * @return string error message

-	 */

-	public function getErrorMessage()

-	{

-		return $this->getMessage();

-	}

-

-	/**

-	 * @param string error message

-	 */

-	protected function setErrorMessage($message)

-	{

-		$this->message=$message;

-	}

-}

-

-/**

- * TSystemException class

- *

- * TSystemException is the base class for all framework-level exceptions.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TSystemException extends TException

-{

-}

-

-/**

- * TApplicationException class

- *

- * TApplicationException is the base class for all user application-level exceptions.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TApplicationException extends TException

-{

-}

-

-/**

- * TInvalidOperationException class

- *

- * TInvalidOperationException represents an exception caused by invalid operations.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TInvalidOperationException extends TSystemException

-{

-}

-

-/**

- * TInvalidDataTypeException class

- *

- * TInvalidDataTypeException represents an exception caused by invalid data type.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TInvalidDataTypeException extends TSystemException

-{

-}

-

-/**

- * TInvalidDataValueException class

- *

- * TInvalidDataValueException represents an exception caused by invalid data value.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TInvalidDataValueException extends TSystemException

-{

-}

-

-/**

- * TConfigurationException class

- *

- * TConfigurationException represents an exception caused by invalid configurations,

- * such as error in an application configuration file or control template file.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TConfigurationException extends TSystemException

-{

-}

-

-/**

- * TTemplateException class

- *

- * TTemplateException represents an exception caused by invalid template syntax.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.1

- */

-class TTemplateException extends TConfigurationException

-{

-	private $_template='';

-	private $_lineNumber=0;

-	private $_fileName='';

-

-	/**

-	 * @return string the template source code that causes the exception. This is empty if {@link getTemplateFile TemplateFile} is not empty.

-	 */

-	public function getTemplateSource()

-	{

-		return $this->_template;

-	}

-

-	/**

-	 * @param string the template source code that causes the exception

-	 */

-	public function setTemplateSource($value)

-	{

-		$this->_template=$value;

-	}

-

-	/**

-	 * @return string the template file that causes the exception. This could be empty if the template is an embedded template. In this case, use {@link getTemplateSource TemplateSource} to obtain the actual template content.

-	 */

-	public function getTemplateFile()

-	{

-		return $this->_fileName;

-	}

-

-	/**

-	 * @param string the template file that causes the exception

-	 */

-	public function setTemplateFile($value)

-	{

-		$this->_fileName=$value;

-	}

-

-	/**

-	 * @return integer the line number at which the template has error

-	 */

-	public function getLineNumber()

-	{

-		return $this->_lineNumber;

-	}

-

-	/**

-	 * @param integer the line number at which the template has error

-	 */

-	public function setLineNumber($value)

-	{

-		$this->_lineNumber=TPropertyValue::ensureInteger($value);

-	}

-}

-

-/**

- * TIOException class

- *

- * TIOException represents an exception related with improper IO operations.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TIOException extends TSystemException

-{

-}

-

-/**

- * TDbException class

- *

- * TDbException represents an exception related with DB operations.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TDbException extends TSystemException

-{

-}

-

-/**

- * TDbConnectionException class

- *

- * TDbConnectionException represents an exception caused by DB connection failure.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TDbConnectionException extends TDbException

-{

-}

-

-/**

- * TNotSupportedException class

- *

- * TNotSupportedException represents an exception caused by using an unsupported PRADO feature.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TNotSupportedException extends TSystemException

-{

-}

-

-/**

- * TPhpErrorException class

- *

- * TPhpErrorException represents an exception caused by a PHP error.

- * This exception is mainly thrown within a PHP error handler.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class TPhpErrorException extends TSystemException

-{

-	/**

-	 * Constructor.

-	 * @param integer error number

-	 * @param string error string

-	 * @param string error file

-	 * @param integer error line number

-	 */

-	public function __construct($errno,$errstr,$errfile,$errline)

-	{

-		static $errorTypes=array(

-			E_ERROR           => "Error",

-			E_WARNING         => "Warning",

-			E_PARSE           => "Parsing Error",

-			E_NOTICE          => "Notice",

-			E_CORE_ERROR      => "Core Error",

-			E_CORE_WARNING    => "Core Warning",

-			E_COMPILE_ERROR   => "Compile Error",

-			E_COMPILE_WARNING => "Compile Warning",

-			E_USER_ERROR      => "User Error",

-			E_USER_WARNING    => "User Warning",

-			E_USER_NOTICE     => "User Notice",

-			E_STRICT          => "Runtime Notice"

-		);

-		$errorType=isset($errorTypes[$errno])?$errorTypes[$errno]:'Unknown Error';

-		parent::__construct("[$errorType] $errstr (@line $errline in file $errfile).");

-	}

-}

-

-

-/**

- * THttpException class

- *

- * THttpException represents an exception that is caused by invalid operations

- * of end-users. The {@link getStatusCode StatusCode} gives the type of HTTP error.

- * It is used by {@link TErrorHandler} to provide different error output to users.

- *

- * @author Qiang Xue <qiang.xue@gmail.com>

- * @version $Id$

- * @package System.Exceptions

- * @since 3.0

- */

-class THttpException extends TSystemException

-{

-	private $_statusCode;

-

-	/**

-	 * Constructor.

-	 * @param integer HTTP status code, such as 404, 500, etc.

-	 * @param string error message. This can be a string that is listed

-	 * in the message file. If so, the message in the preferred language

-	 * will be used as the error message. Any rest parameters will be used

-	 * to replace placeholders ({0}, {1}, {2}, etc.) in the message.

-	 */

-	public function __construct($statusCode,$errorMessage)

-	{

-		$this->_statusCode=$statusCode;

-		$this->setErrorCode($errorMessage);

-		$errorMessage=$this->translateErrorMessage($errorMessage);

-		$args=func_get_args();

-		array_shift($args);

-		array_shift($args);

-		$n=count($args);

-		$tokens=array();

-		for($i=0;$i<$n;++$i)

-			$tokens['{'.$i.'}']=TPropertyValue::ensureString($args[$i]);

-		parent::__construct(strtr($errorMessage,$tokens));

-	}

-

-	/**

-	 * @return integer HTTP status code, such as 404, 500, etc.

-	 */

-	public function getStatusCode()

-	{

-		return $this->_statusCode;

-	}

-}

-

+		return isset(self::$_messageCache[$msgFile][$key]) ? self::$_messageCache[$msgFile][$key] : $key;
+	}
+
+	/**
+	 * @return string path to the error message file
+	 */
+	protected function getErrorMessageFile()
+	{
+		$lang=Prado::getPreferredLanguage();
+		$msgFile=Prado::getFrameworkPath().'/Exceptions/messages/messages-'.$lang.'.txt';
+		if(!is_file($msgFile))
+			$msgFile=Prado::getFrameworkPath().'/Exceptions/messages/messages.txt';
+		return $msgFile;
+	}
+
+	/**
+	 * @return string error code
+	 */
+	public function getErrorCode()
+	{
+		return $this->_errorCode;
+	}
+
+	/**
+	 * @param string error code
+	 */
+	public function setErrorCode($code)
+	{
+		$this->_errorCode=$code;
+	}
+
+	/**
+	 * @return string error message
+	 */
+	public function getErrorMessage()
+	{
+		return $this->getMessage();
+	}
+
+	/**
+	 * @param string error message
+	 */
+	protected function setErrorMessage($message)
+	{
+		$this->message=$message;
+	}
+}
+
+/**
+ * TSystemException class
+ *
+ * TSystemException is the base class for all framework-level exceptions.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TSystemException extends TException
+{
+}
+
+/**
+ * TApplicationException class
+ *
+ * TApplicationException is the base class for all user application-level exceptions.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TApplicationException extends TException
+{
+}
+
+/**
+ * TInvalidOperationException class
+ *
+ * TInvalidOperationException represents an exception caused by invalid operations.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TInvalidOperationException extends TSystemException
+{
+}
+
+/**
+ * TInvalidDataTypeException class
+ *
+ * TInvalidDataTypeException represents an exception caused by invalid data type.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TInvalidDataTypeException extends TSystemException
+{
+}
+
+/**
+ * TInvalidDataValueException class
+ *
+ * TInvalidDataValueException represents an exception caused by invalid data value.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TInvalidDataValueException extends TSystemException
+{
+}
+
+/**
+ * TConfigurationException class
+ *
+ * TConfigurationException represents an exception caused by invalid configurations,
+ * such as error in an application configuration file or control template file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TConfigurationException extends TSystemException
+{
+}
+
+/**
+ * TTemplateException class
+ *
+ * TTemplateException represents an exception caused by invalid template syntax.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.1
+ */
+class TTemplateException extends TConfigurationException
+{
+	private $_template='';
+	private $_lineNumber=0;
+	private $_fileName='';
+
+	/**
+	 * @return string the template source code that causes the exception. This is empty if {@link getTemplateFile TemplateFile} is not empty.
+	 */
+	public function getTemplateSource()
+	{
+		return $this->_template;
+	}
+
+	/**
+	 * @param string the template source code that causes the exception
+	 */
+	public function setTemplateSource($value)
+	{
+		$this->_template=$value;
+	}
+
+	/**
+	 * @return string the template file that causes the exception. This could be empty if the template is an embedded template. In this case, use {@link getTemplateSource TemplateSource} to obtain the actual template content.
+	 */
+	public function getTemplateFile()
+	{
+		return $this->_fileName;
+	}
+
+	/**
+	 * @param string the template file that causes the exception
+	 */
+	public function setTemplateFile($value)
+	{
+		$this->_fileName=$value;
+	}
+
+	/**
+	 * @return integer the line number at which the template has error
+	 */
+	public function getLineNumber()
+	{
+		return $this->_lineNumber;
+	}
+
+	/**
+	 * @param integer the line number at which the template has error
+	 */
+	public function setLineNumber($value)
+	{
+		$this->_lineNumber=TPropertyValue::ensureInteger($value);
+	}
+}
+
+/**
+ * TIOException class
+ *
+ * TIOException represents an exception related with improper IO operations.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TIOException extends TSystemException
+{
+}
+
+/**
+ * TDbException class
+ *
+ * TDbException represents an exception related with DB operations.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TDbException extends TSystemException
+{
+}
+
+/**
+ * TDbConnectionException class
+ *
+ * TDbConnectionException represents an exception caused by DB connection failure.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TDbConnectionException extends TDbException
+{
+}
+
+/**
+ * TNotSupportedException class
+ *
+ * TNotSupportedException represents an exception caused by using an unsupported PRADO feature.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TNotSupportedException extends TSystemException
+{
+}
+
+/**
+ * TPhpErrorException class
+ *
+ * TPhpErrorException represents an exception caused by a PHP error.
+ * This exception is mainly thrown within a PHP error handler.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class TPhpErrorException extends TSystemException
+{
+	/**
+	 * Constructor.
+	 * @param integer error number
+	 * @param string error string
+	 * @param string error file
+	 * @param integer error line number
+	 */
+	public function __construct($errno,$errstr,$errfile,$errline)
+	{
+		static $errorTypes=array(
+			E_ERROR           => "Error",
+			E_WARNING         => "Warning",
+			E_PARSE           => "Parsing Error",
+			E_NOTICE          => "Notice",
+			E_CORE_ERROR      => "Core Error",
+			E_CORE_WARNING    => "Core Warning",
+			E_COMPILE_ERROR   => "Compile Error",
+			E_COMPILE_WARNING => "Compile Warning",
+			E_USER_ERROR      => "User Error",
+			E_USER_WARNING    => "User Warning",
+			E_USER_NOTICE     => "User Notice",
+			E_STRICT          => "Runtime Notice"
+		);
+		$errorType=isset($errorTypes[$errno])?$errorTypes[$errno]:'Unknown Error';
+		parent::__construct("[$errorType] $errstr (@line $errline in file $errfile).");
+	}
+}
+
+
+/**
+ * THttpException class
+ *
+ * THttpException represents an exception that is caused by invalid operations
+ * of end-users. The {@link getStatusCode StatusCode} gives the type of HTTP error.
+ * It is used by {@link TErrorHandler} to provide different error output to users.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id$
+ * @package System.Exceptions
+ * @since 3.0
+ */
+class THttpException extends TSystemException
+{
+	private $_statusCode;
+
+	/**
+	 * Constructor.
+	 * @param integer HTTP status code, such as 404, 500, etc.
+	 * @param string error message. This can be a string that is listed
+	 * in the message file. If so, the message in the preferred language
+	 * will be used as the error message. Any rest parameters will be used
+	 * to replace placeholders ({0}, {1}, {2}, etc.) in the message.
+	 */
+	public function __construct($statusCode,$errorMessage)
+	{
+		$this->_statusCode=$statusCode;
+		$this->setErrorCode($errorMessage);
+		$errorMessage=$this->translateErrorMessage($errorMessage);
+		$args=func_get_args();
+		array_shift($args);
+		array_shift($args);
+		$n=count($args);
+		$tokens=array();
+		for($i=0;$i<$n;++$i)
+			$tokens['{'.$i.'}']=TPropertyValue::ensureString($args[$i]);
+		parent::__construct(strtr($errorMessage,$tokens));
+	}
+
+	/**
+	 * @return integer HTTP status code, such as 404, 500, etc.
+	 */
+	public function getStatusCode()
+	{
+		return $this->_statusCode;
+	}
+}
+