127 lines
2.8 KiB
PHP
127 lines
2.8 KiB
PHP
<?php
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/**
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* This file is part of the Symfony CMF package.
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*
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* (c) 2011-2014 Symfony CMF
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Cmf\Component\Routing;
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/**
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* Provides a route collection which avoids having all routes in memory.
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*
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* Internally, this does load multiple routes over time using a
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* PagedRouteProviderInterface $route_provider.
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*/
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class PagedRouteCollection implements \Iterator, \Countable
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{
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/**
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* @var PagedRouteProviderInterface
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*/
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protected $provider;
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/**
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* Stores the amount of routes which are loaded in parallel and kept in
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* memory.
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*
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* @var int
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*/
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protected $routesBatchSize;
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/**
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* Contains the current item the iterator points to.
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*
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* @var int
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*/
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protected $current = -1;
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/**
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* Stores the current loaded routes.
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*
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* @var \Symfony\Component\Routing\Route[]
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*/
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protected $currentRoutes;
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public function __construct(PagedRouteProviderInterface $pagedRouteProvider, $routesBatchSize = 50)
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{
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$this->provider = $pagedRouteProvider;
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$this->routesBatchSize = $routesBatchSize;
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}
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/**
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* Loads the next routes into the elements array.
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*
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* @param int $offset The offset used in the db query.
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*/
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protected function loadNextElements($offset)
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{
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// If the last batch was smaller than the batch size, this means there
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// are no more routes available.
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if (isset($this->currentRoutes) && count($this->currentRoutes) < $this->routesBatchSize) {
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$this->currentRoutes = array();
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} else {
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$this->currentRoutes = $this->provider->getRoutesPaged($offset, $this->routesBatchSize);
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function current()
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{
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return current($this->currentRoutes);
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}
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/**
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* {@inheritdoc}
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*/
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public function next()
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{
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$result = next($this->currentRoutes);
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if (false === $result) {
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$this->loadNextElements($this->current + 1);
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}
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$this->current++;
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}
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/**
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* {@inheritdoc}
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*/
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public function key()
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{
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return key($this->currentRoutes);
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}
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/**
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* {@inheritdoc}
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*/
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public function valid()
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{
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return key($this->currentRoutes);
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}
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/**
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* {@inheritdoc}
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*/
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public function rewind()
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{
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$this->current = 0;
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$this->currentRoutes = NULL;
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$this->loadNextElements($this->current);
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}
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/**
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* Gets the number of Routes in this collection.
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*
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* @return int The number of routes
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*/
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public function count()
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{
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return $this->provider->getRoutesCount();
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}
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}
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