ParamHandler.php

<?php

abstract class ParamHandler
{
    protected $source;
    
    protected $params = array();
    
    function __construct($source) {
        $this->source = $source;
    }
    
    function addParam($key,$val) {
        $this->params[$key] = $val;
    }
    
    function getAllParams() {
        return $this->params;
    }
    
    static function getInstance($filename) {
        if(preg_match("/\.xml$/i",$filename)) {
            return new XmlParamHandler($filename);
        }
        
        return new TextParamHandler($filename);
    }
    
    abstract function write();
    
    abstract function read();
}

class XmlParamHandler extends ParamHandler {
    function write(){
        
    }
    
    function read(){
        
    }
}

class TextParamHandler extends ParamHandler {
    function write() {
        
    }
    
    function read() {
        
    }
}
?>