/*
* @(#)$Id: DBAccessorFactory.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.util.jdbc.helper;
import xbird.config.Settings;
import xbird.util.jdbc.DBAccessor;
import xbird.util.jdbc.impl.DerbyAccessor;
import xbird.util.jdbc.impl.PGAccessor;
/**
* Database accessor factory.
* <DIV lang="en"></DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI <yuin405+xbird@gmail.com>
*/
public final class DBAccessorFactory {
// ---------------------------------------------------------
// Constants
private static final String KIND_POSTGRES = "postgres";
private static final String KIND_DERBY = "derby";
private static final String DB_KIND = Settings.get("xbird.db.kind").toLowerCase();
// ---------------------------------------------------------
// Shared variables
private static DBAccessor dbAccessor = null;
private DBAccessorFactory() {}
/**
* Creates Database accessor.
*/
public static DBAccessor create() {
if(dbAccessor != null)
return dbAccessor;
final DBAccessor dba;
if(KIND_POSTGRES.equals(DB_KIND)) {
dba = new PGAccessor();
} else if(KIND_DERBY.equals(DB_KIND)) {
dba = new DerbyAccessor();
} else {
throw new UnsupportedOperationException("Unsupported DB kind: " + DB_KIND);
}
dbAccessor = dba; // set reference.
return dba;
}
}