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856天前/** |
* The Command abstraction. |
* In this case the implementation must return a result, |
* sometimes it only has side effects. |
*/ |
interface Validator |
{ |
/** |
* The method could have any parameters. |
* @param mixed |
* @return boolean |
*/ |
public function isValid($value); |
} |
|
/** |
* ConcreteCommand. |
*/ |
class MoreThanZeroValidator implements Validator |
{ |
public function isValid($value) |
{ |
return $value > 0; |
} |
} |
|
/** |
* ConcreteCommand. |
*/ |
class EvenValidator implements Validator |
{ |
public function isValid($value) |
{ |
return $value % 2 == 0; |
} |
} |
|
/** |
* The Invoker. An implementation could store more than one |
* Validator if needed. |
*/ |
class ArrayProcessor |
{ |
protected $_rule; |
|
public function __construct (Validator $rule) |
{ |
$this->_rule = $rule; |
} |
|
public function process(array $numbers) |
{ |
foreach ($numbers as $n) { |
if ($this->_rule->IsValid($n)) { |
echo $n, "\n"; |
} |
} |
} |
} |
|
// Client code |
$processor = new ArrayProcessor(new EvenValidator()); |
$processor->process(array(1, 20, 18, 5, 0, 31, 42)); |
