/*
XOWA: the XOWA Offline Wiki Application
Copyright (C) 2012 gnosygnu@gmail.com

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program 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 program.  If not, see <http://www.gnu.org/licenses/>.
*/
package gplx.dbs; import gplx.*;
import gplx.dbs.engines.mems.*;
public class Db_conn_pool {
	private final HashAdp dbm_hash = HashAdp_.new_(); private final HashAdp engine_hash = HashAdp_.new_();
	Db_conn_pool() {this.Init();}
	public Db_conn Get_or_new__sqlite(Io_url url) {return Get_or_new(Db_url_.sqlite_(url));}
	public Db_conn Get_or_new(Db_url url) {
		Db_conn rv = (Db_conn)dbm_hash.Fetch(url.Xto_api());
		if (rv == null) {
			Db_engine prime = (Db_engine)engine_hash.Fetch(url.Tid()); if (prime == null) throw Err_.new_("db engine prototype not found; tid={0}", url.Tid());
			Db_engine clone = prime.New_clone(url);
			rv = new Db_conn(clone);
			dbm_hash.Add(url.Xto_api(), rv);
		}
		return rv;
	}
	public void Set_mem(String db, Db_meta_tbl... tbls) {
		Db_url url = Db_url__mem.new_(db);
		Db_engine__mem engine = new Db_engine__mem(url, tbls);
		Db_conn dbm = new Db_conn(engine);
		dbm_hash.AddReplace(url.Xto_api(), dbm);
	}
	private void Init() {
		this.Engines__add(Db_engine_null._, TdbEngine._, Mysql_engine._, Postgres_engine._, Sqlite_engine._, Db_engine__mem._);
	}
	public void Engines__add(Db_engine... ary) {
		for (Db_engine itm : ary)
			engine_hash.Add(itm.Tid(), itm);
	}
        public static final Db_conn_pool I = new Db_conn_pool();
}