<?php

namespace Vn\Lib;

/**
 * Base class for rest methods.
 */
abstract class Method {
	protected $app;
	protected $conn = NULL;

	/**
	 * Initializes the method.
	 *
	 * @param app Lib\App The application
	 */
	function __construct($app) {
		$this->app = $app;
	}

	/**
	 * Executes the method. Shoud be defined by child classes.
	 *
	 * @param {Db\Conn} $db The main database connection
	 * @return mixed The result of the method
	 */
	abstract function run($db);
	
	/**
	 * Returns the system database connection.
	 *
	 * return {Db\Conn} The database connection
	 */
	function getSysConn() {
		return $this->app->getSysConn();
	}

	/**
	 * Check if a set of keys are defined and not empty inside the passed
	 * associative array.
	 *
	 * @param {string} $map The map to check
	 * @param {array} $params The list of keys to check
	 * @return {boolean} %TRUE if all key are defined, %FALSE otherwise
	 */
	function checkParams($map, $params) {
		if (!isset($map))
			return FALSE;

		foreach ($params as $param)
		if (!isset($map[$param])) {
			return FALSE;
			break;
		}
		
		return TRUE;
	}
}