<?php

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);
	}
}
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