1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | <?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 read(){ echo 'XmlParamHandler Read.' ; } function write(){ echo 'XmlParamHandler Write.' ; } } class TextParamHandler extends ParamHandler{ function read(){ echo 'TextParamHandler Read.' ; } function write(){ echo 'TextParamHandler Write.' ; } } //抽象方法不能直接实例化,直接调用抽象方法内的静态方法来实例化子类 //这样也行 尼玛...... $test = ParamHandler::getInstance( "./params.xml" ); $test ->addParam( "key1" , "value1" ); $test ->addParam( "key2" , "value2" ); $test ->addParam( "key3" , "value3" ); $test ->write(); ?> |