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<?php
namespace Laminas\EventManager;
/**
* FilterChain: intercepting filter manager
*/
class FilterChain implements Filter\FilterInterface
{
/** @var Filter\FilterIterator All filters */
protected $filters;
/**
* Constructor
*
* Initializes Filter\FilterIterator in which filters will be aggregated
*/
public function __construct()
{
$this->filters = new Filter\FilterIterator();
}
/**
* Apply the filters
*
* Begins iteration of the filters.
*
* @param mixed $context Object under observation
* @param mixed $argv Associative array of arguments
* @return mixed
*/
public function run($context, array $argv = [])
{
$chain = clone $this->getFilters();
if ($chain->isEmpty()) {
return;
}
$next = $chain->extract();
return $next($context, $argv, $chain);
}
/**
* Connect a filter to the chain
*
* @param callable $callback PHP Callback
* @param int $priority Priority in the queue at which to execute;
* defaults to 1 (higher numbers == higher priority)
* @return CallbackHandler (to allow later unsubscribe)
* @throws Exception\InvalidCallbackException
*/
public function attach(callable $callback, $priority = 1)
{
$this->filters->insert($callback, $priority);
return $callback;
}
/**
* Detach a filter from the chain
*
* @return bool Returns true if filter found and unsubscribed; returns false otherwise
*/
public function detach(callable $filter)
{
return $this->filters->remove($filter);
}
/**
* Retrieve all filters
*
* @return Filter\FilterIterator
*/
public function getFilters()
{
return $this->filters;
}
/**
* Clear all filters
*
* @return void
*/
public function clearFilters()
{
$this->filters = new Filter\FilterIterator();
}
/**
* Return current responses
*
* Only available while the chain is still being iterated. Returns the
* current ResponseCollection.
*
* @return null|ResponseCollection
*/
public function getResponses()
{
return null;
}
}