<?php
/**
 * This file is part of RSS-Bridge, a PHP project capable of generating RSS and
 * Atom feeds for websites that don't have one.
 *
 * For the full license information, please view the UNLICENSE file distributed
 * with this source code.
 *
 * @package	Core
 * @license	http://unlicense.org/ UNLICENSE
 * @link	https://github.com/rss-bridge/rss-bridge
 */

/**
 * Abstract class for factories.
 */
abstract class FactoryAbstract {

	/**
	 * Holds the working directory
	 *
	 * @var string
	 */
	private $workingDir = null;

	/**
	 * Set the working directory.
	 *
	 * @param string $dir The working directory.
	 * @return void
	 */
	public function setWorkingDir($dir) {
		$this->workingDir = null;

		if(!is_string($dir)) {
			throw new \InvalidArgumentException('Working directory must be a string!');
		}

		if(!file_exists($dir)) {
			throw new \Exception('Working directory does not exist!');
		}

		if(!is_dir($dir)) {
			throw new \InvalidArgumentException($dir . ' is not a directory!');
		}

		$this->workingDir = realpath($dir) . '/';
	}

	/**
	 * Get the working directory
	 *
	 * @return string The working directory.
	 */
	public function getWorkingDir() {
		if(is_null($this->workingDir)) {
			throw new \LogicException('Working directory is not set!');
		}

		return $this->workingDir;
	}

	/**
	 * Creates a new instance for the object specified by name.
	 *
	 * @param string $name The name of the object to create.
	 * @return object The object instance
	 */
	abstract public function create($name);
}