public function addOutputFilter($cb)
{
list($f) = Util::reflectionCallable($cb);
$params = $f->getParameters();
if (count($params) !== 1) {
throw new Exception("Output filter must accepts exactly 1 parameter");
}
if (!in_array($cb, $this->outputFilters)) {
$this->outputFilters[] = $cb;
}
}
/**
* Set input and output filters
*
* Input filter is nothing but a callable, which accepts 4 parameters:
* http method, uri, handler callback and handler parameters. Returning
* anything other than NULL will keep handler from executing, and showing
* the result to user.
*
* Input filter is mean to filter the work flow, so it SHOULD NOT modify
* these parameters.
*
* Output filter is mean to filter data. It is a simple function accepts
* the result of handler, manipulate on it, then return it back. Anything
* returned from it will show to user, including NULL.
*/
public function setFilters(array $input = array(), array $output = array())
{
// validate input filters
foreach ($input as $i) {
list($f) = Util::reflectionCallable($i);
if (count($f->getParameters()) !== 4) {
throw new Exception('Input filter must accepts exactly 4 parameters');
}
}
// validate output filters
foreach ($output as $o) {
list($f) = Util::reflectionCallable($o);
if (count($f->getParameters()) !== 1) {
throw new Exception('Output filter must accepts exactly 1 parameter');
}
}
$this->currentFilters = array($input, $output);
return $this;
}
