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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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
namespace Zend\View\Resolver;
use Countable;
use IteratorAggregate;
use Zend\Stdlib\PriorityQueue;
use Zend\View\Renderer\RendererInterface as Renderer;
use Zend\View\Resolver\ResolverInterface as Resolver;
class AggregateResolver implements Countable, IteratorAggregate, ResolverInterface
{
const FAILURE_NO_RESOLVERS = 'AggregateResolver_Failure_No_Resolvers';
const FAILURE_NOT_FOUND = 'AggregateResolver_Failure_Not_Found';
/**
* Last lookup failure
* @var false|string
*/
protected $lastLookupFailure = false;
/**
* @var Resolver
*/
protected $lastSuccessfulResolver;
/**
* @var PriorityQueue
*/
protected $queue;
/**
* Constructor
*
* Instantiate the internal priority queue
*
*/
public function __construct()
{
$this->queue = new PriorityQueue();
}
/**
* Return count of attached resolvers
*
* @return int
*/
public function count()
{
return $this->queue->count();
}
/**
* IteratorAggregate: return internal iterator
*
* @return PriorityQueue
*/
public function getIterator()
{
return $this->queue;
}
/**
* Attach a resolver
*
* @param Resolver $resolver
* @param int $priority
* @return AggregateResolver
*/
public function attach(Resolver $resolver, $priority = 1)
{
$this->queue->insert($resolver, $priority);
return $this;
}
/**
* Resolve a template/pattern name to a resource the renderer can consume
*
* @param string $name
* @param null|Renderer $renderer
* @return false|string
*/
public function resolve($name, Renderer $renderer = null)
{
$this->lastLookupFailure = false;
$this->lastSuccessfulResolver = null;
if (0 === count($this->queue)) {
$this->lastLookupFailure = static::FAILURE_NO_RESOLVERS;
return false;
}
foreach ($this->queue as $resolver) {
$resource = $resolver->resolve($name, $renderer);
if ($resource) {
// Resource found; return it
$this->lastSuccessfulResolver = $resolver;
return $resource;
}
}
$this->lastLookupFailure = static::FAILURE_NOT_FOUND;
return false;
}
/**
* Return the last successful resolver, if any
*
* @return Resolver
*/
public function getLastSuccessfulResolver()
{
return $this->lastSuccessfulResolver;
}
/**
* Get last lookup failure
*
* @return false|string
*/
public function getLastLookupFailure()
{
return $this->lastLookupFailure;
}
}
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