AppStateESS/homestead

<?php

namespace Homestead;

use \phpws2\Database;

/**
 * Singleton Factory class for creating \PDO objects based on
 * PHPWS database configuration. Somewhat of a wrapper
 * class for our current situation.
 *
 * @author jbooker
 * @package homestead
 */
class PdoFactory {

    static $factory;

    private $pdo;

    /**
     * Returns a PdoFactory instance
     * @return PdoFactory $pdo A PdoInstance object
     */
    public static function getInstance()
    {
        if (!isset(self::$factory)) {
            self::$factory = new PdoFactory();
        }

        return self::$factory;
    }

    /**
     * Returns a \PDO object which is connected to the current database
     * @return $pdo A \PDO instance, connected to the current DB
     */
    public static function getPdoInstance()
    {
        $pdoFactory = self::getInstance();

        return $pdoFactory->getPdo();
    }


    private function __construct()
    {
        if (!defined('PHPWS_DSN')) {
            throw new \Exception('Database connection DSN is not set.');
        }
        $dsnArray = \phpws2\Database::parseDSN(PHPWS_DSN);

        $dsn = $this->createDsn($dsnArray['dbtype'], $dsnArray['dbhost'], $dsnArray['dbname']);

        $this->pdo = new \PDO($dsn, $dsnArray['dbuser'], $dsnArray['dbpass'], array(\PDO::ATTR_PERSISTENT => true));

        // Make sure \PDO will throw exceptions on error
        $this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
    }

    public function getPdo()
    {
        return $this->pdo;
    }

    private function createDsn($dbType, $host, $dbName)
    {
        return "$dbType:" . ($host != '' ? "host=$host" : '') . ";dbname=$dbName";
    }
}