<?php
/**
 * 错误和异常处理
 * @author 北京迅达科技-许仙 <QQ:1216560669 >
 * @time 2011-12-27 17:14
 * @version 1.0
 */
class Error extends Exception {	
	/**
	 * @const integer 系统错误标识
	 */
	const PHP_ERROR = 0;
	
	/**
	 * @const integer 用户错误标识
	 */
	const CODE_ERROR = -1;

	/**
	 * @const integer 用户消息标识
	 */
	const USER_MSG = -2;

	/**
	 * @const integer 数据库错误标识
	 */
	const DB_ERROR = -3;
	
    /**
     * 重定义构造器使 message 变为必须被指定的属性
     * 
     * @param string $message 错误消息
     * @param integer $code 错误类型 
     * @return void 
     */
    public function __construct($message, $code = 0) {
        parent::__construct($message, $code);
    }
        
    /**
     * 自定义字符串输出的样式
     * 
     * @return void 
     */
    public function __toString() {
        return __CLASS__;
    }

    /**
     * 获取错误信息
     * 
     * @return array 详细错误信息 
     */
    public function getError() {
        $trace = $this->getTrace();
        if (isset($trace[0]['file'])) $this->file = $trace[0]['file'];
    	if (isset($trace[0]['line'])) $this->line = $trace[0]['line'];
    	$types = array(
    		self::CODE_ERROR => '程序错误', 
    		self::PHP_ERROR => '系统错误', 
    		self::USER_MSG => '用户消息', 
    		self::DB_ERROR => '数据库错误',
    	);
    	$this->type = isset($types[$this->code]) ? $types[$this->code] : 'UNKNOW_ERROR';
		$tmpArr = array();
		$index  = 0;
		foreach ($trace as $value) {
			$tmpStr = '';
			if (isset($value['line'])) $tmpStr .= '[Line: ' . $value['line'] . ']';
			if (isset($value['file'])) $tmpStr .= $value['file'];
			$tmpStr .= '(';
			if (isset($value['class'])) $tmpStr .= $value['class'];
			if (isset($value['type'])) $tmpStr .= $value['type'];
			if (isset($value['function'])) $tmpStr .= $value['function'];
			if (isset($value['args'])) $tmpStr .= '(' . $this->getArgsInfo($value['args']) . ')';
			$tmpStr .= ')';
			$tmpArr[] =  $tmpStr;
			$index++;
		}	
		$error['code']      = $this->code;
        $error['message']   = $this->message;
        $error['type']      = $this->type;
        $error['file']      = $this->file;
        $error['line']      = $this->line;
        $error['trace']     = $tmpArr;
        $error['traceArr']  = $trace;
        return $error ;
    }
    
	/**
	 * 获取参数信息
	 * 
	 * @param string $args 参数
	 * @return string 参数信息 
	 */
	public function getArgsInfo($args) {
		$tmpArr = array();
		foreach ($args as $value) {
			if (is_object($value)) {
				$tmpArr[] = "Object(" . get_class($value) . ")";	
			} elseif (is_array($value)) {
				$tmpArr[] = 'Array';
			} else {
				$tmpArr[] = $value;	
			}
		}
		return implode(", ", $tmpArr);	
	}
}
