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File: exception.class.php.in
<?php

	/**
	 * \defgroup Core
	 */

	/**
	 * \ingroup Core
	 *
	 * PHP Java-style definition of an Exception object.
	 */
	class Exception  
	{

		var $_exceptionString;
		var $_exceptionCode;

        /**
         * Creates a new Exception.
         *
         * @param exceptionString Descriptive message carried by the exception
         * @param exceptionCode Numerical error code assigned to this exception
         */
		function Exception( $exceptionString, $exceptionCode = 0 )
		{
			

			$this->_exceptionString = $exceptionString;
			$this->_exceptionCode   = $exceptionCode;
		}

		/**
		 * Throws the exception and stops the execution, dumping some
		 * interesting information.
		 */
		function throw()
		{
			// gather some information
			print( "<br/><b>Exception message</b>: ".$this->_exceptionString."<br/><b>Error code</b>: ".$this->_exceptionCode."<br/>" );
			$this->_printStackTrace();
		}

		function _printStackTrace()
		{
        	if( function_exists("debug_backtrace")) {
				$info = debug_backtrace();

				print( "-- Backtrace --<br/><i>" );
				foreach( $info as $trace ) {
					if( ($trace["function"] != "_internalerrorhandler") && ($trace["file"] != __FILE__ )) {
						print( $trace["file"] );
						print( "(".$trace["line"]."): " );
						if( isset( $trace["class"] )) {
    						if( $trace["class"] != "" )
    	   						print( $trace["class"]."." );
    	                }
						print( $trace["function"] );
						print( "<br/>" );
					}
				}
				print( "</i>" );
            }
            else {
            	print("<i>Stack trace is not available</i><br/>");
            }
		}
	}

	/**
	 * This error handler takes care of throwing exceptions whenever an error
	 * occurs.
	 */
	function _internalErrorHandler( $errorCode, $errorString )
	{
		$exc = new Exception( $errorString, $errorCode );

		//print(var_dump(debug_backtrace()));

		// we don't want the E_NOTICE errors to throw an exception...
		if( $errorCode != E_NOTICE )
			$exc->throw();
	}

    /**
     * Throws an exception
     */
	function throw( $exception )
	{
		$exception->throw();
	}

	function catch( $exception )
	{
		print( "Exception catched!" );
	}

	// this registers our own error handler
	$old_error_handler = set_error_handler( "_internalErrorHandler" );
	// and now we say what we would like to see
?>