<?php

namespace ByJG\AnyDataset\Db;

use ByJG\Util\Uri;

class Factory
{
	/**
	 * @param $connectionString
	 * @param $schemesAlternative
	 * @return \ByJG\AnyDataset\Db\DbDriverInterface
	 */
	public static function getDbRelationalInstance($connectionString, $schemesAlternative = null)
	{
		return self::getDbInstance(new Uri($connectionString), $schemesAlternative);
	}


	/**
	 * @param $connectionUri Uri
	 * @param $schemesAlternative
	 * @return mixed
	 */
	public static function getDbInstance($connectionUri, $schemesAlternative = null)
	{
		$scheme = $connectionUri->getScheme();

		$prefix = '\\ByJG\\AnyDataset\\Db\\';
		$validSchemes =  array_merge(
		    [
		        "oci8" => $prefix . "DbOci8Driver",
		        "dblib" => $prefix . "PdoDblib",
		        "sqlsrv" => $prefix . "PdoSqlsrv",
		        "mysql" => $prefix . "PdoMysql",
		        "pgsql" => $prefix . "PdoPgsql",
		        "oci" => $prefix . "PdoOci",
		        "odbc" => $prefix . "PdoOdbc",
		        "sqlite" => $prefix . "PdoSqlite",
		        "pdo" => $prefix . "PdoPdo"
		    ],
		    (array)$schemesAlternative
		);

		if (!isset($validSchemes[$scheme])) {
		    throw new \InvalidArgumentException("The '$scheme' scheme does not exist. Check the scheme name or use the Generic PDO scheme");
		}

		$class = $validSchemes[$scheme];

		$instance = new $class($connectionUri);

		if (!($instance instanceof DbDriverInterface)) {
		    throw new \InvalidArgumentException(
		        "The class '$class' is not a instance of DbDriverInterface"
		    );
		}

		return $instance;
	}


	/**
	 * Get a IDbFunctions class to execute Database specific operations.
	 *
	 * @param \ByJG\Util\Uri $connectionUri
	 * @return \ByJG\AnyDataset\Db\DbFunctionsInterface
	 */
	public static function getDbFunctions(Uri $connectionUri)
	{
		$dbFunc = "\\ByJG\\AnyDataset\\Db\\Helpers\\Db"
		    . ucfirst($connectionUri->getScheme())
		    . "Functions";
		return new $dbFunc();
	}
}
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