/*
 *
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 *
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 *
 *
 *    In some countries OX, OX Open-Xchange, open xchange and OXtender
 *    as well as the corresponding Logos OX Open-Xchange and OX are registered
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 *    The use of the Logos is not covered by the GNU General Public License.
 *    Instead, you are allowed to use these Logos according to the terms and
 *    conditions of the Creative Commons License, Version 2.5, Attribution,
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 *
 *    Please make sure that third-party modules and libraries are used
 *    according to their respective licenses.
 *
 *    Any modifications to this package must retain all copyright notices
 *    of the original copyright holder(s) for the original code used.
 *
 *    After any such modifications, the original and derivative code shall remain
 *    under the copyright of the copyright holder(s) and/or original author(s)per
 *    the Attribution and Assignment Agreement that can be located at
 *    http://www.open-xchange.com/EN/developer/. The contributing author shall be
 *    given Attribution for the derivative code and a license granting use.
 *
 *     Copyright (C) 2004-2011 Open-Xchange, Inc.
 *     Mail: info@open-xchange.com
 *
 *
 *     This program is free software; you can redistribute it and/or modify it
 *     under the terms of the GNU General Public License, Version 2 as published
 *     by the Free Software Foundation.
 *
 *     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 General Public License
 *     for more details.
 *
 *     You should have received a copy of the GNU General Public License along
 *     with this program; if not, write to the Free Software Foundation, Inc., 59
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 *
 */

package com.openexchange.groupware.update.tasks;

import static com.openexchange.tools.sql.DBUtils.autocommit;
import static com.openexchange.tools.sql.DBUtils.rollback;
import static com.openexchange.tools.update.Tools.createIndex;
import static com.openexchange.tools.update.Tools.existsIndex;
import java.sql.Connection;
import java.sql.SQLException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.openexchange.databaseold.Database;
import com.openexchange.groupware.AbstractOXException;
import com.openexchange.groupware.update.Schema;
import com.openexchange.groupware.update.UpdateExceptionCodes;
import com.openexchange.groupware.update.UpdateTask;

/**
 * Update task for adding an index on prg_dates_members.
 * @author <a href="mailto:marcus@open-xchange.org">Marcus Klein</a>
 */
public class AddAppointmentParticipantsIndexTask implements UpdateTask {

    private static final Log LOG = LogFactory.getLog(AddAppointmentParticipantsIndexTask.class);

    public AddAppointmentParticipantsIndexTask() {
        super();
    }

    public int addedWithVersion() {
        return 34;
    }

    public int getPriority() {
        return UpdateTaskPriority.NORMAL.priority;
    }

    public void perform(Schema schema, int contextId) throws AbstractOXException {
        final Connection con = Database.getNoTimeout(contextId, true);
        try {
            con.setAutoCommit(false);
            correctAppointmentParticipantIndexes(con);
            con.commit();
        } catch (final SQLException e) {
            rollback(con);
            throw UpdateExceptionCodes.SQL_PROBLEM.create(e, e.getMessage());
        } finally {
            autocommit(con);
            Database.backNoTimeout(contextId, true, con);
        }
    }

    private void correctAppointmentParticipantIndexes(Connection con) {
        String[] columns = { "cid", "member_uid", "object_id" };
        for (String table : new String[] { "prg_dates_members", "del_dates_members" }) {
            try {
                String indexName = existsIndex(con, table, columns);
                if (null == indexName) {
                    LOG.info("Creating new index named member with columns (cid,member_uid,object_id) on table " + table + ".");
                    createIndex(con, table, "member", columns, true);
                } else {
                    LOG.info("New unique index named " + indexName + " with columns (cid,member_uid,object_id) already exists on table " + table + ".");
                }
            } catch (SQLException e) {
                LOG.error("Problem correcting indexes on table " + table + ".", e);
            }
        }
    }
}
