2. 现在我们将注意力转向Application/Form/Factory类，并添加属性和设置器，允许我们附加Application/Filter/Filter和Application/Filter/Validator的实例。我们还需要定义$data，它将用于保留过滤和验证的数据。
复制 const DATA_NOT_FOUND = 'Data not found. Run setData()';
const FILTER_NOT_FOUND = 'Filter not found. Run setFilter()';
const VALIDATOR_NOT_FOUND = 'Validator not found. Run setValidator()';
protected $filter;
protected $validator;
protected $data;
public function setFilter(Filter $filter)
{
$this->filter = $filter;
}
public function setValidator(Validator $validator)
{
$this->validator = $validator;
}
public function setData($data)
{
$this->data = $data;
} 3. 接下来，我们定义了一个validate()方法，该方法调用嵌入式Application/Filter/Validator实例的process()方法。我们检查$data和$validator是否存在。如果不存在，就会抛出相应的异常，并指示需要先运行哪个方法。
复制 public function validate()
{
if (!$this->data)
throw new RuntimeException(self::DATA_NOT_FOUND);
if (!$this->validator)
throw new RuntimeException(self::VALIDATOR_NOT_FOUND); 4. 调用process()方法后，我们将验证结果消息与表单元素消息关联起来。需要注意的是，process()方法会返回一个布尔值，代表数据集的整体验证状态。当表单在验证失败后重新显示时，错误信息将出现在每个元素旁边。
复制 $valid = $this->validator->process($this->data);
foreach ($this->elements as $element) {
if (isset($this->validator->getResults()
[$element->getName()])) {
$element->setErrors($this->validator->getResults()
[$element->getName()]->messages);
}
}
return $valid;
} 5. 以类似的方式，我们定义了一个filter()方法，该方法调用嵌入式Application/Filter/Filter实例的process()方法。与步骤3中描述的validate()方法一样，我们需要检查$data和$filter是否存在。如果缺少任何一个，我们将抛出一个带有适当消息的RuntimeException。
复制 public function filter()
{
if (!$this->data)
throw new RuntimeException(self::DATA_NOT_FOUND);
if (!$this->filter)
throw new RuntimeException(self::FILTER_NOT_FOUND); 6. 然后我们运行process()方法，产生一个Result对象数组，其中$item属性代表过滤链的最终结果。然后我们对结果进行循环，如果对应的$element键匹配，则将值属性设置为过滤后的值。我们还添加过滤过程中产生的任何消息。当表单重新显示时，所有的值属性都会显示过滤后的结果。
复制 $this->filter->process($this->data);
foreach ($this->filter->getResults() as $key => $result) {
if (isset($this->elements[$key])) {
$this->elements[$key]
->setSingleAttribute('value', $result->item);
if (isset($result->messages)
&& count($result->messages)) {
foreach ($result->messages as $message) {
$this->elements[$key]->addSingleError($message);
}
}
}
}
}
复制 <?php
use Application\Form\Generic;
define('VALIDATE_SUCCESS', 'SUCCESS: form submitted ok!');
define('VALIDATE_FAILURE', 'ERROR: validation errors detected');
$wrappers = [
Generic::INPUT => ['type' => 'td', 'class' => 'content'],
Generic::LABEL => ['type' => 'th', 'class' => 'label'],
Generic::ERRORS => ['type' => 'td', 'class' => 'error']
];
$elements = [
'first_name' => [
'class' => 'Application\Form\Generic',
'type' => Generic::TYPE_TEXT,
'label' => 'First Name',
'wrappers' => $wrappers,
'attributes'=> ['maxLength'=>128,'required'=>'']
],
'last_name' => [
'class' => 'Application\Form\Generic',
'type' => Generic::TYPE_TEXT,
'label' => 'Last Name',
'wrappers' => $wrappers,
'attributes'=> ['maxLength'=>128,'required'=>'']
],
// etc.
];
// overall form config
$formConfig = [
'name' => 'prospectsForm',
'attributes' => [
'method'=>'post',
'action'=>'chap_06_tying_filters_to_form.php'
],
'row_wrapper' => ['type' => 'tr', 'class' => 'row'],
'form_wrapper' => [
'type'=>'table',
'class'=>'table',
'id'=>'prospectsTable',
'class'=>'display','cellspacing'=>'0'
],
'form_tag_inside_wrapper' => FALSE,
];
$assignments = [
'first_name' => [ ['key' => 'length',
'params' => ['min' => 1, 'max' => 128]],
['key' => 'alnum',
'params' => ['allowWhiteSpace' => TRUE]],
['key' => 'required','params' => []] ],
'last_name' => [ ['key' => 'length',
'params' => ['min' => 1, 'max' => 128]],
['key' => 'alnum',
'params' => ['allowWhiteSpace' => TRUE]],
['key' => 'required','params' => []] ],
'address' => [ ['key' => 'length',
'params' => ['max' => 256]] ],
'city' => [ ['key' => 'length',
'params' => ['min' => 1, 'max' => 64]] ],
'state_province'=> [ ['key' => 'length',
'params' => ['min' => 1, 'max' => 32]] ],
'postal_code' => [ ['key' => 'length',
'params' => ['min' => 1, 'max' => 16] ],
['key' => 'alnum',
'params' => ['allowWhiteSpace' => TRUE]],
['key' => 'required','params' => []] ],
'phone' => [ ['key' => 'phone', 'params' => []] ],
'country' => [ ['key' => 'in_array',
'params' => $countries ],
['key' => 'required','params' => []] ],
'email' => [ ['key' => 'email', 'params' => [] ],
['key' => 'length',
'params' => ['max' => 250] ],
['key' => 'required','params' => [] ] ],
'budget' => [ ['key' => 'float', 'params' => []] ]
];
复制 <?php
require __DIR__ . '/../Application/Autoload/Loader.php';
Application\Autoload\Loader::init(__DIR__ . '/..');
include __DIR__ . '/chap_06_post_data_config_messages.php';
include __DIR__ . '/chap_06_post_data_config_callbacks.php';
include __DIR__ . '/chap_06_tying_filters_to_form_definitions.php';
复制 use Application\Form\Factory;
use Application\Filter\ { Validator, Filter };
$form = Factory::generate($elements);
$form->setFilter(new Filter($callbacks['filters'], $assignments['filters']));
$form->setValidator(new Validator($callbacks['validators'], $assignments['validators']));
复制 $message = '';
if (isset($_POST['submit'])) {
$form->setData($_POST);
if ($form->validate()) {
$message = VALIDATE_SUCCESS;
} else {
$message = VALIDATE_FAILURE;
}
$form->filter();
}
?>
复制 <?= $form->render($form, $formConfig); ?> 
