<?php

namespace Assetic\Factory\Resource;

/**
 * A resource is something formulae can be loaded from.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
interface ResourceInterface
{
	/**
	 * Checks if a timestamp represents the latest resource.
	 *
	 * @param integer $timestamp A UNIX timestamp
	 *
	 * @return Boolean True if the timestamp is up to date
	 */
	public function isFresh($timestamp);


	/**
	 * Returns the content of the resource.
	 *
	 * @return string The content
	 */
	public function getContent();


	/**
	 * Returns a unique string for the current resource.
	 *
	 * @return string A unique string to identity the current resource
	 */
	public function __toString();
}
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