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eFaps is a framework used to map objects with or without attached files to a relational database and optional file systems (only for attaches files). Configurable access control can be provided down to object and attribute level depending on implementation and use case. Depending on requirements, events (like triggers) allow to implement business logic and to separate business logic from user interface. The framework includes integrations (e.g. webdav, full text search) and a web application as 'simple' configurable user interface. Some best practises, example web application modules (e.g. team work module) support administrators and implementers using this framework.

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/*
 * Copyright 2003 - 2011 The eFaps Team
 *
 * 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.
 *
 * Revision:        $Rev: 6236 $
 * Last Changed:    $Date: 2011-02-24 23:40:46 -0500 (Thu, 24 Feb 2011) $
 * Last Changed By: $Author: [email protected] $
 */


package org.efaps.db.databases;

import java.sql.Connection;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Factory to create the DataBase istance.
 *
 * @author The eFaps Team
 * @version $Id: DataBaseFactory.java 6236 2011-02-25 04:40:46Z [email protected] $
 */
public abstract class DataBaseFactory
{

    /**
     * Logging instance used in this class.
     */
    private static final Logger LOG = LoggerFactory.getLogger(DataBaseFactory.class);


    /**
     * Hyrachical list of clazzNames that will be check in the given
     * sequence if the database is connected.
     */
    private static final List CLAZZNAMES = new ArrayList();

    static {
        DataBaseFactory.CLAZZNAMES.add("org.efaps.db.databases.PostgreSQLDatabase");
        DataBaseFactory.CLAZZNAMES.add("org.efaps.db.databases.DerbyDatabase");
        DataBaseFactory.CLAZZNAMES.add("org.efaps.db.databases.MySQLDatabase");
        DataBaseFactory.CLAZZNAMES.add("org.efaps.db.databases.OracleDatabase");
        DataBaseFactory.CLAZZNAMES.add("org.efaps.db.databases.OracleDatabaseWithAutoSequence");
    }

    /**
     * @param _connection Connection to be uesd
     * @return AbstractDatabase
     */
    public static AbstractDatabase getDatabase(final Connection _connection)
    {
        AbstractDatabase ret = null;
        for (final String clazzName : DataBaseFactory.CLAZZNAMES) {
            try {
                ret = (AbstractDatabase) Class.forName(clazzName).newInstance();
                if (ret.isConnected(_connection)) {
                    break;
                }
            } catch (final ClassNotFoundException e) {
                DataBaseFactory.LOG.error("Error on instanciating of {} {}", clazzName, e);
            } catch (final InstantiationException e) {
                DataBaseFactory.LOG.error("Error on instanciating of {} {}", clazzName, e);
            } catch (final IllegalAccessException e) {
                DataBaseFactory.LOG.error("Error on instanciating of {} {}", clazzName, e);
            } catch (final SQLException e) {
                DataBaseFactory.LOG.error("Catched Error from DataBase {}, trying next.", clazzName, e);
            }
        }
        return ret;
    }
}