Possible abstract Application class for the Lousson Project

AbstractApplication.php

<?php

namespace Lousson\Application;

use Lousson\Config\AnyConfig;
use Lousson\Config\Builtin\BuiltinConfig;
use Lousson\Config\AnyConfigLoader;
use Lousson\Config\Builtin\BuiltinConfigLoader;

require 'PEAR/Config.php';

abstract class AbstractApplication implements AnyConfig {

    private static $instance;
    protected $config = null;
    protected static $ds = array();

    public function __construct(AnyConfig $config) {
        $this->config = $config;
    }

    public function addDatasource($name, Datasource $ds) {
        $this->ds[$name] = $ds;
    }

    abstract public function initDatasources();

    public static function getInstance(AnyConfigLoader $configLoader = null) {
        if ($this->instance == null) {

            if ($configLoader == null) {
                $configLoader = new BuiltinConfigLoader();
            }
            $config = $configLoader->loadConfig(self::getConfigFile());

            $clazz = __CLASS__;
            self::$instance = new $clazz($config);
        }

        return self::$instance;
    }

    private static function getConfigFile() {
        $base = "";
        return $base . $_SERVER['Stage'] ."php.inc";
    }

    public function getOption($name, $fallback = null) {
        $this->config->getOption($name, $fallback);
    }

    public function hasOption($name) {
        $this->config->hasOption($name);
    }

    public function getDataSource($name) {
        $this->ds[$name];
    }

    /**
     * returns the PEAR constant cfg_dir which can be configured
     * when pear gets installed or with: pear config-set cfg_dir [Path]
     *
     * @return String Path of the default config dir where all the config
     *          files of installed packages are lying.
     */
    public static function getDefaultConfigDir()
    {
        return PEAR_CONFIG_DEFAULT_CFG_DIR;
    }

    /**
     * returns the PEAR constant data_dir which can be configured
     * when pear gets installed or with: pear config-set data_dir [Path]
     *
     * @return String Path of the default data dir where all the local
     *          databases and static files of installed packages are lying.
     */
    public static function getDefaultDataDir()
    {
        return PEAR_CONFIG_DEFAULT_DATA_DIR;
    }
}