<commit_before><?php
/**
 * ownCloud
 *
 * @author <NAME>
 * @author <NAME>
 * @copyright 2012 <NAME> <EMAIL>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
/*
 *
 * The following SQL statement is just a help for developers and will not be
 * executed!
 *
 * CREATE TABLE  `appconfig` (
 * `appid` VARCHAR( 255 ) NOT NULL ,
 * `configkey` VARCHAR( 255 ) NOT NULL ,
 * `configvalue` VARCHAR( 255 ) NOT NULL
 * )
 *
 */

/**
 * This class provides an easy way for apps to store config values in the
 * database.
 */
class OC_Appconfig {

	private static $cache = array();

	/**
	 * @brief Get all apps using the config
	 * @return array with app ids
	 *
	 * This function returns a list of all apps that have at least one
	 * entry in the appconfig table.
	 */
	public static function getApps() {
		// No magic in here!
		$query = OC_DB::prepare('SELECT DISTINCT `appid` FROM `*PREFIX*appconfig`');
		$result = $query->execute();

		$apps = array();
		while ($row = $result->fetchRow()) {
			$apps[] = $row["appid"];
		}

		return $apps;
	}

	/**
	 * @brief Get the available keys for an app
	 * @param string $app the app we are looking for
	 * @return array with key names
	 *
	 * This function gets all keys of an app. Please note that the values are
	 * not returned.
	 */
	public static function getKeys($app) {
		// No magic in here as well
		$query = OC_DB::prepare('SELECT `configkey` FROM `*PREFIX*appconfig` WHERE `appid` = ?');
		$result = $query->execute(array($app));

		$keys = array();
		while ($row = $result->fetchRow()) {
			$keys[] = $row["configkey"];
		}

		return $keys;
	}

	private static function getAppValues($app) {
		if (!isset(self::$cache[$app])) {
			self::$cache[$app] = array();
		}
		$query = OC_DB::prepare('SELECT `configvalue`, `configkey` FROM `*PREFIX*appconfig`'
			. ' WHERE `appid` = ?');
		$result = $query->execute(array($app));
		while ($row = $result->fetchRow()) {
			self::$cache[$app][$row['configkey']] = $row['configvalue'];
		}
		return self::$cache[$app];
	}

	/**
	 * @brief Gets the config value
	 * @param string $app app
	 * @param string $key key
	 * @param string $default = null, default value if the key does not exist
	 * @return string the value or $default
	 *
	 * This function gets a value from the appconfig table. If the key does
	 * not exist the default value will be returned
	 */
	public static function getValue($app, $key, $default = null) {
		if (!isset(self::$cache[$app])) {
			self::$cache[$app] = array();
		}
		if (isset(self::$cache[$app][$key])) {
			return self::$cache[$app][$key];
		}
		$values = self::getAppValues($app);
		if (isset($values[$key])) {
			return $values[$key];
		} else {
			self::$cache[$app][$key] = $default;
			return $default;<commit_msg>dont re-read the config values for an app when a non existing key is fetched<commit_after><?php
/**
 * ownCloud
 *
 * @author <NAME>
 * @author <NAME>
 * @copyright 2012 <NAME> <EMAIL>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
/*
 *
 * The following SQL statement is just a help for developers and will not be
 * executed!
 *
 * CREATE TABLE  `appconfig` (
 * `appid` VARCHAR( 255 ) NOT NULL ,
 * `configkey` VARCHAR( 255 ) NOT NULL ,
 * `configvalue` VARCHAR( 255 ) NOT NULL
 * )
 *
 */

/**
 * This class provides an easy way for apps to store config values in the
 * database.
 */
class OC_Appconfig {

	private static $cache = array();

	private static $appsLoaded = array();

	/**
	 * @brief Get all apps using the config
	 * @return array with app ids
	 *
	 * This function returns a list of all apps that have at least one
	 * entry in the appconfig table.
	 */
	public static function getApps() {
		// No magic in here!
		$query = OC_DB::prepare('SELECT DISTINCT `appid` FROM `*PREFIX*appconfig`');
		$result = $query->execute();

		$apps = array();
		while ($row = $result->fetchRow()) {
			$apps[] = $row["appid"];
		}

		return $apps;
	}

	/**
	 * @brief Get the available keys for an app
	 * @param string $app the app we are looking for
	 * @return array with key names
	 *
	 * This function gets all keys of an app. Please note that the values are
	 * not returned.
	 */
	public static function getKeys($app) {
		// No magic in here as well
		$query = OC_DB::prepare('SELECT `configkey` FROM `*PREFIX*appconfig` WHERE `appid` = ?');
		$result = $query->execute(array($app));

		$keys = array();
		while ($row = $result->fetchRow()) {
			$keys[] = $row["configkey"];
		}

		return $keys;
	}

	private static function getAppValues($app) {
		if (!isset(self::$cache[$app])) {
			self::$cache[$app] = array();
		}
		if (array_search($app, self::$appsLoaded) === false) {
			$query = OC_DB::prepare('SELECT `configvalue`, `configkey` FROM `*PREFIX*appconfig`'
				. ' WHERE `appid` = ?');
			$result = $query->execute(array($app));
			while ($row = $result->fetchRow()) {
				self::$cache[$app][$row['configkey']] = $row['configvalue'];
			}
			self::$appsLoaded[] = $app;
		}
		return self::$cache[$app];
	}

	/**
	 * @brief Gets the config value
	 * @param string $app app
	 * @param string $key key
	 * @param string $default = null, default value if the key does not exist
	 * @return string the value or $default
	 *
	 * This function gets a value from the appconfig table. If the key does
	 * not exist the default value will be returned
	 */
	public static function getValue($app, $key, $default = null) {
		if (!isset(self::$cache[$app])) {
			self::$cache[$app] = array();
		}
		if (isset(self::$cache[$app][$key])) {
			return self::$cache[$app][$key];
		}
		$values = self::getAppValues($app);
		if (isset($values[$key])) {
			return $values[$key];
		} else {
			self::$cache[$app][$key] = $default;
			return $default;
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