<?php
class OB_FileWriter
{
	private $_filename;
	private $_fp = null;
	private $_errorHandlersRegistered = false;

	public function __construct($filename)
	{
		$this->setFilename($filename);
	}

	public function __destruct()
	{
		//Make sure no data is lost
		if($this->_fp)
			$this->end();
	}

	public function setFilename($filename)
	{
		$this->_filename = $filename;
	}

	public function getFilename()
	{
		return $this->_filename;
	}

	public function setHaltOnError($value)		
	{
		//If new state is same as old, don't do anything
		if($value === $this->_errorHandlersRegistered)
			return;


		if($value === true)
		{
			set_exception_handler(array($this,'exceptionHandler'));
			set_error_handler(array($this,'errorHandler'));	
			$this->_errorHandlersRegistered = true;
		}
		else
		{
			restore_error_handler();
			restore_exception_handler();
			$this->_errorHandlersRegistered = false;
		}
	}

	public function start()
	{
		$this->_fp = @fopen($this->_filename,'w');
		if(!$this->_fp)
			throw new Exception('Cannot open file '.$this->_filename.' for writing!');

		ob_start(array($this,'outputHandler'),1024);
	}

	public function end()
	{
		$this->_stopBuffering();
		$this->setHaltOnError(false);
	}

	private function _stopBuffering()
	{
		@ob_end_flush();
		if($this->_fp)
			fclose($this->_fp);

		$this->_fp = null;
	}

	public function outputHandler($buffer)
	{
		fwrite($this->_fp,$buffer);
	}

	public function exceptionHandler($exception)
	{
		$this->_stopBuffering();
		echo '<b>Fatal error: uncaught', $exception;
	}

	public function errorHandler($errno, $errstr, $errfile, $errline)
	{		
		$this->_stopBuffering();
		$errorNumber = E_USER_ERROR;
		switch($errno)
		{
		case E_ERROR:
			$errorNumber = E_USER_ERROR;
			break;
		case E_NOTICE:
			$errorNumber = E_USER_NOTICE;
			break;
		case E_WARNING:
			$errorNumber = E_USER_WARNING;
			break;
		}
		trigger_error("$errstr, File: $errfile line $errline",$errorNumber);
	}
}
?>