/ConfigurationPhpUnitVars.php

<?php



/**

 * Configuration to get the config from xml files

 *

 * @author Fabrizio Branca

 */

class Menta_ConfigurationPhpUnitVars implements Menta_Interface_Configuration {



	/**

	 * @var Menta_ConfigurationPhpUnitVars

	 */

	protected static $instance;



	/**

	 * @var array

	 */

	protected static $configurationFiles = array();



	/**

	 * @static

	 * @throws InvalidArgumentException

	 * @param $configurationFile

	 * @return void

	 */

	public static function addConfigurationFile($configurationFile) {

		if (!is_file($configurationFile)) {

			throw new InvalidArgumentException("Could not find file '$configurationFile'");

		}

		self::$configurationFiles[] = $configurationFile;

	}



	/**

	 * Get singleton instance

	 *

	 * @return Menta_ConfigurationPhpUnitVars

	 */

	public static function getInstance() {

		if (is_null(self::$instance)) {

			self::$instance = new Menta_ConfigurationPhpUnitVars();

		}

		return self::$instance;

	}



	/**

	 * Get configuration value

	 *

	 * @throws Exception if key is not found

	 * @param string $key

	 * @return string

	 */

	public function getValue($key) {

		if (empty($GLOBALS[__CLASS__.'_defaultsLoaded'])) {

			$this->loadDefaults();

		}

		if (!$this->issetKey($key)) {

			throw new Exception(sprintf('Could not find configuration key "%s"', $key));

		}



		// json decoding if possible

		$jsonDecoded = json_decode($GLOBALS[$key], true);

		if (!is_null($jsonDecoded)) {

			$GLOBALS[$key] = $jsonDecoded;

		}

		return $GLOBALS[$key];

	}



	/**

	 * Check if key is set

	 *

	 * @param string $key

	 * @return boolean

	 */

	public function issetKey($key) {

		if (empty($GLOBALS[__CLASS__.'_defaultsLoaded'])) {

			$this->loadDefaults();

		}

		return isset($GLOBALS[$key]);

	}



	/**

	 * Read values from file and stores them into $GLOBALS without overriding existing values

	 *

	 * @return void

	 */

	protected function loadDefaults() {

		foreach (self::$configurationFiles as $xmlfile) {

			if (file_exists($xmlfile)) {

				$xml = simplexml_load_file($xmlfile);

				foreach ($xml->xpath('//phpunit/php/var') as $node) { /* @var $node SimpleXMLElement */

					$key = (string)$node['name'];

					if (!isset($GLOBALS[$key])) { // only set the default value if no other value is set

						$GLOBALS[$key] = (string)$node['value'];

					}

				}

			}

		}

		// storing information to globals instead of static properties. So if globals will

		// be restored this information also gets lost and will trigger reloading of the defaults

		$GLOBALS[__CLASS__.'_defaultsLoaded'] = true;

	}



}