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Filename : UrlGeneratorInterface.php
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<?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\Generator;

use Symfony\Component\Routing\Exception\InvalidParameterException;
use Symfony\Component\Routing\Exception\MissingMandatoryParametersException;
use Symfony\Component\Routing\Exception\RouteNotFoundException;
use Symfony\Component\Routing\RequestContextAwareInterface;

/**
 * UrlGeneratorInterface is the interface that all URL generator classes must implement.
 *
 * The constants in this interface define the different types of resource references that
 * are declared in RFC 3986: http://tools.ietf.org/html/rfc3986
 * We are using the term "URL" instead of "URI" as this is more common in web applications
 * and we do not need to distinguish them as the difference is mostly semantical and
 * less technical. Generating URIs, i.e. representation-independent resource identifiers,
 * is also possible.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Tobias Schultze <http://tobion.de>
 */
interface UrlGeneratorInterface extends RequestContextAwareInterface
{
    /**
     * Generates an absolute URL, e.g. "http://example.com/dir/file".
     */
    const ABSOLUTE_URL = 0;

    /**
     * Generates an absolute path, e.g. "/dir/file".
     */
    const ABSOLUTE_PATH = 1;

    /**
     * Generates a relative path based on the current request path, e.g. "../parent-file".
     *
     * @see UrlGenerator::getRelativePath()
     */
    const RELATIVE_PATH = 2;

    /**
     * Generates a network path, e.g. "//example.com/dir/file".
     * Such reference reuses the current scheme but specifies the host.
     */
    const NETWORK_PATH = 3;

    /**
     * Generates a URL or path for a specific route based on the given parameters.
     *
     * Parameters that reference placeholders in the route pattern will substitute them in the
     * path or host. Extra params are added as query string to the URL.
     *
     * When the passed reference type cannot be generated for the route because it requires a different
     * host or scheme than the current one, the method will return a more comprehensive reference
     * that includes the required params. For example, when you call this method with $referenceType = ABSOLUTE_PATH
     * but the route requires the https scheme whereas the current scheme is http, it will instead return an
     * ABSOLUTE_URL with the https scheme and the current host. This makes sure the generated URL matches
     * the route in any case.
     *
     * If there is no route with the given name, the generator must throw the RouteNotFoundException.
     *
     * The special parameter _fragment will be used as the document fragment suffixed to the final URL.
     *
     * @param string $name          The name of the route
     * @param mixed  $parameters    An array of parameters
     * @param int    $referenceType The type of reference to be generated (one of the constants)
     *
     * @return string The generated URL
     *
     * @throws RouteNotFoundException              If the named route doesn't exist
     * @throws MissingMandatoryParametersException When some parameters are missing that are mandatory for the route
     * @throws InvalidParameterException           When a parameter value for a placeholder is not correct because
     *                                             it does not match the requirement
     */
    public function generate($name, $parameters = array(), $referenceType = self::ABSOLUTE_PATH);
}