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FilterChain.php
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FilterChain.php
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<?php
/**
* Zend Framework (http://framework.zend.com/)
*
* @link http://github.com/zendframework/zf2 for the canonical source repository
* @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @package Zend_Filter
*/
namespace Zend\Filter;
use Countable;
use Zend\Stdlib\PriorityQueue;
/**
* @category Zend
* @package Zend_Filter
*/
class FilterChain extends AbstractFilter implements Countable
{
/**
* Default priority at which filters are added
*/
const DEFAULT_PRIORITY = 1000;
/**
* @var FilterPluginManager
*/
protected $plugins;
/**
* Filter chain
*
* @var PriorityQueue
*/
protected $filters;
/**
* Initialize filter chain
*
*/
public function __construct($options = null)
{
$this->filters = new PriorityQueue();
if (null !== $options) {
$this->setOptions($options);
}
}
public function setOptions($options)
{
if (!is_array($options) && !$options instanceof \Traversable) {
throw new Exception\InvalidArgumentException(sprintf(
'Expected array or Traversable; received "%s"',
(is_object($options) ? get_class($options) : gettype($options))
));
}
foreach ($options as $key => $value) {
switch (strtolower($key)) {
case 'callbacks':
foreach ($value as $spec) {
$callback = isset($spec['callback']) ? $spec['callback'] : false;
$priority = isset($spec['priority']) ? $spec['priority'] : static::DEFAULT_PRIORITY;
if ($callback) {
$this->attach($callback, $priority);
}
}
break;
case 'filters':
foreach ($value as $spec) {
$name = isset($spec['name']) ? $spec['name'] : false;
$options = isset($spec['options']) ? $spec['options'] : array();
$priority = isset($spec['priority']) ? $spec['priority'] : static::DEFAULT_PRIORITY;
if ($name) {
$this->attachByName($name, $options, $priority);
}
}
break;
default:
// ignore other options
break;
}
}
return $this;
}
/**
* Return the count of attached filters
*
* @return int
*/
public function count()
{
return count($this->filters);
}
/**
* Get plugin manager instance
*
* @return FilterPluginManager
*/
public function getPluginManager()
{
if (!$this->plugins) {
$this->setPluginManager(new FilterPluginManager());
}
return $this->plugins;
}
/**
* Set plugin manager instance
*
* @param FilterPluginManager $plugins
* @return FilterChain
*/
public function setPluginManager(FilterPluginManager $plugins)
{
$this->plugins = $plugins;
return $this;
}
/**
* Retrieve a filter plugin by name
*
* @param mixed $name
* @param array $options
* @return FilterInterface
*/
public function plugin($name, array $options = array())
{
$plugins = $this->getPluginManager();
return $plugins->get($name, $options);
}
/**
* Attach a filter to the chain
*
* @param callable|FilterInterface $callback A Filter implementation or valid PHP callback
* @param int $priority Priority at which to enqueue filter; defaults to 1000 (higher executes earlier)
* @throws Exception\InvalidArgumentException
* @return FilterChain
*/
public function attach($callback, $priority = self::DEFAULT_PRIORITY)
{
if (!is_callable($callback)) {
if (!$callback instanceof FilterInterface) {
throw new Exception\InvalidArgumentException(sprintf(
'Expected a valid PHP callback; received "%s"',
(is_object($callback) ? get_class($callback) : gettype($callback))
));
}
$callback = array($callback, 'filter');
}
$this->filters->insert($callback, $priority);
return $this;
}
/**
* Attach a filter to the chain using a short name
*
* Retrieves the filter from the attached plugin broker, and then calls attach()
* with the retrieved instance.
*
* @param string $name
* @param mixed $options
* @param int $priority Priority at which to enqueue filter; defaults to 1000 (higher executes earlier)
* @return FilterChain
*/
public function attachByName($name, $options = array(), $priority = self::DEFAULT_PRIORITY)
{
if (!is_array($options)) {
$options = (array) $options;
} elseif (empty($options)) {
$options = null;
}
$filter = $this->getPluginManager()->get($name, $options);
return $this->attach($filter, $priority);
}
/**
* Merge the filter chain with the one given in parameter
*
* @param FilterChain $filterChain
* @return FilterChain
*/
public function merge(FilterChain $filterChain)
{
foreach ($filterChain->filters as $filter) {
$this->attach($filter);
}
return $this;
}
/**
* Get all the filters
*
* @return PriorityQueue
*/
public function getFilters()
{
return $this->filters;
}
/**
* Returns $value filtered through each filter in the chain
*
* Filters are run in the order in which they were added to the chain (FIFO)
*
* @param mixed $value
* @return mixed
*/
public function filter($value)
{
$chain = clone $this->filters;
$valueFiltered = $value;
foreach ($chain as $filter) {
$valueFiltered = call_user_func($filter, $valueFiltered);
}
return $valueFiltered;
}
/**
* Clone filters
*
* @return void
*/
public function __clone()
{
$this->filters = clone $this->filters;
}
}