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name : Router.php
 <?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Routing;

use Symfony\Component\Config\Loader\LoaderInterface;
use Symfony\Component\Config\ConfigCache;
use Psr\Log\LoggerInterface;
use Symfony\Component\Routing\Generator\ConfigurableRequirementsInterface;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Symfony\Component\Routing\Generator\Dumper\GeneratorDumperInterface;
use Symfony\Component\Routing\Matcher\RequestMatcherInterface;
use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
use Symfony\Component\Routing\Matcher\Dumper\MatcherDumperInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * The Router class is an example of the integration of all pieces of the
 * routing system for easier use.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class Router implements RouterInterface, RequestMatcherInterface
{
    /**
     * @var UrlMatcherInterface|null
     */
    protected $matcher;

    /**
     * @var UrlGeneratorInterface|null
     */
    protected $generator;

    /**
     * @var RequestContext
     */
    protected $context;

    /**
     * @var LoaderInterface
     */
    protected $loader;

    /**
     * @var RouteCollection|null
     */
    protected $collection;

    /**
     * @var mixed
     */
    protected $resource;

    /**
     * @var array
     */
    protected $options = array();

    /**
     * @var LoggerInterface|null
     */
    protected $logger;

    /**
     * Constructor.
     *
     * @param LoaderInterface $loader   A LoaderInterface instance
     * @param mixed           $resource The main resource to load
     * @param array           $options  An array of options
     * @param RequestContext  $context  The context
     * @param LoggerInterface $logger   A logger instance
     */
    public function __construct(LoaderInterface $loader, $resource, array $options = array(), RequestContext $context = null, LoggerInterface $logger = null)
    {
        $this->loader = $loader;
        $this->resource = $resource;
        $this->logger = $logger;
        $this->context = $context ?: new RequestContext();
        $this->setOptions($options);
    }

    /**
     * Sets options.
     *
     * Available options:
     *
     *   * cache_dir:     The cache directory (or null to disable caching)
     *   * debug:         Whether to enable debugging or not (false by default)
     *   * resource_type: Type hint for the main resource (optional)
     *
     * @param array $options An array of options
     *
     * @throws \InvalidArgumentException When unsupported option is provided
     */
    public function setOptions(array $options)
    {
        $this->options = array(
            'cache_dir'              => null,
            'debug'                  => false,
            'generator_class'        => 'Symfony\\Component\\Routing\\Generator\\UrlGenerator',
            'generator_base_class'   => 'Symfony\\Component\\Routing\\Generator\\UrlGenerator',
            'generator_dumper_class' => 'Symfony\\Component\\Routing\\Generator\\Dumper\\PhpGeneratorDumper',
            'generator_cache_class'  => 'ProjectUrlGenerator',
            'matcher_class'          => 'Symfony\\Component\\Routing\\Matcher\\UrlMatcher',
            'matcher_base_class'     => 'Symfony\\Component\\Routing\\Matcher\\UrlMatcher',
            'matcher_dumper_class'   => 'Symfony\\Component\\Routing\\Matcher\\Dumper\\PhpMatcherDumper',
            'matcher_cache_class'    => 'ProjectUrlMatcher',
            'resource_type'          => null,
            'strict_requirements'    => true,
        );

        // check option names and live merge, if errors are encountered Exception will be thrown
        $invalid = array();
        foreach ($options as $key => $value) {
            if (array_key_exists($key, $this->options)) {
                $this->options[$key] = $value;
            } else {
                $invalid[] = $key;
            }
        }

        if ($invalid) {
            throw new \InvalidArgumentException(sprintf('The Router does not support the following options: "%s".', implode('", "', $invalid)));
        }
    }

    /**
     * Sets an option.
     *
     * @param string $key   The key
     * @param mixed  $value The value
     *
     * @throws \InvalidArgumentException
     */
    public function setOption($key, $value)
    {
        if (!array_key_exists($key, $this->options)) {
            throw new \InvalidArgumentException(sprintf('The Router does not support the "%s" option.', $key));
        }

        $this->options[$key] = $value;
    }

    /**
     * Gets an option value.
     *
     * @param string $key The key
     *
     * @return mixed The value
     *
     * @throws \InvalidArgumentException
     */
    public function getOption($key)
    {
        if (!array_key_exists($key, $this->options)) {
            throw new \InvalidArgumentException(sprintf('The Router does not support the "%s" option.', $key));
        }

        return $this->options[$key];
    }

    /**
     * {@inheritdoc}
     */
    public function getRouteCollection()
    {
        if (null === $this->collection) {
            $this->collection = $this->loader->load($this->resource, $this->options['resource_type']);
        }

        return $this->collection;
    }

    /**
     * {@inheritdoc}
     */
    public function setContext(RequestContext $context)
    {
        $this->context = $context;

        if (null !== $this->matcher) {
            $this->getMatcher()->setContext($context);
        }
        if (null !== $this->generator) {
            $this->getGenerator()->setContext($context);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function getContext()
    {
        return $this->context;
    }

    /**
     * {@inheritdoc}
     */
    public function generate($name, $parameters = array(), $referenceType = self::ABSOLUTE_PATH)
    {
        return $this->getGenerator()->generate($name, $parameters, $referenceType);
    }

    /**
     * {@inheritdoc}
     */
    public function match($pathinfo)
    {
        return $this->getMatcher()->match($pathinfo);
    }

    /**
     * {@inheritdoc}
     */
    public function matchRequest(Request $request)
    {
        $matcher = $this->getMatcher();
        if (!$matcher instanceof RequestMatcherInterface) {
            // fallback to the default UrlMatcherInterface
            return $matcher->match($request->getPathInfo());
        }

        return $matcher->matchRequest($request);
    }

    /**
     * Gets the UrlMatcher instance associated with this Router.
     *
     * @return UrlMatcherInterface A UrlMatcherInterface instance
     */
    public function getMatcher()
    {
        if (null !== $this->matcher) {
            return $this->matcher;
        }

        if (null === $this->options['cache_dir'] || null === $this->options['matcher_cache_class']) {
            return $this->matcher = new $this->options['matcher_class']($this->getRouteCollection(), $this->context);
        }

        $class = $this->options['matcher_cache_class'];
        $cache = new ConfigCache($this->options['cache_dir'].'/'.$class.'.php', $this->options['debug']);
        if (!$cache->isFresh()) {
            $dumper = $this->getMatcherDumperInstance();

            $options = array(
                'class'      => $class,
                'base_class' => $this->options['matcher_base_class'],
            );

            $cache->write($dumper->dump($options), $this->getRouteCollection()->getResources());
        }

        require_once $cache;

        return $this->matcher = new $class($this->context);
    }

    /**
     * Gets the UrlGenerator instance associated with this Router.
     *
     * @return UrlGeneratorInterface A UrlGeneratorInterface instance
     */
    public function getGenerator()
    {
        if (null !== $this->generator) {
            return $this->generator;
        }

        if (null === $this->options['cache_dir'] || null === $this->options['generator_cache_class']) {
            $this->generator = new $this->options['generator_class']($this->getRouteCollection(), $this->context, $this->logger);
        } else {
            $class = $this->options['generator_cache_class'];
            $cache = new ConfigCache($this->options['cache_dir'].'/'.$class.'.php', $this->options['debug']);
            if (!$cache->isFresh()) {
                $dumper = $this->getGeneratorDumperInstance();

                $options = array(
                    'class'      => $class,
                    'base_class' => $this->options['generator_base_class'],
                );

                $cache->write($dumper->dump($options), $this->getRouteCollection()->getResources());
            }

            require_once $cache;

            $this->generator = new $class($this->context, $this->logger);
        }

        if ($this->generator instanceof ConfigurableRequirementsInterface) {
            $this->generator->setStrictRequirements($this->options['strict_requirements']);
        }

        return $this->generator;
    }

    /**
     * @return GeneratorDumperInterface
     */
    protected function getGeneratorDumperInstance()
    {
        return new $this->options['generator_dumper_class']($this->getRouteCollection());
    }

    /**
     * @return MatcherDumperInterface
     */
    protected function getMatcherDumperInstance()
    {
        return new $this->options['matcher_dumper_class']($this->getRouteCollection());
    }
}
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