<?php

/*

 * This file is part of the Assetic package, an OpenSky project.

 *

 * (c) 2010-2011 OpenSky Project Inc

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Assetic;

use Assetic\Asset\AssetInterface;

/**

 * Manages assets.

 *

 * @author Kris Wallsmith <kris.wallsmith@gmail.com>

 */

class AssetManager

{

    private $assets = array();

    /**

     * Gets an asset by name.

     *

     * @param string $name The asset name

     *

     * @return AssetInterface The asset

     *

     * @throws InvalidArgumentException If there is no asset by that name

     */

    public function get($name)

    {

        if (!isset($this->assets[$name])) {

            throw new \InvalidArgumentException(sprintf('There is no "%s" asset.', $name));

        }

        return $this->assets[$name];

    }

    /**

     * Checks if the current asset manager has a certain asset.

     *

     * @param string $name an asset name

     *

     * @return Boolean True if the asset has been set, false if not

     */

    public function has($name)

    {

        return isset($this->assets[$name]);

    }

    /**

     * Registers an asset to the current asset manager.

     *

     * @param string         $name  The asset name

     * @param AssetInterface $asset The asset

     */

    public function set($name, AssetInterface $asset)

    {

        if (!ctype_alnum(str_replace('_', '', $name))) {

            throw new \InvalidArgumentException(sprintf('The name "%s" is invalid.', $name));

        }

        $this->assets[$name] = $asset;

    }

    /**

     * Returns an array of asset names.

     *

     * @return array An array of asset names

     */

    public function getNames()

    {

        return array_keys($this->assets);

    }

}