/**
 * Copyright (c) 2002-2011 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j 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 org.neo4j.kernel.ha;

import java.util.concurrent.TimeUnit;

public abstract class TimeUtil
{
    private static final TimeUnit DEFAULT_TIME_UNIT = TimeUnit.SECONDS;
    
    public static long parseTimeMillis( String timeWithOrWithoutUnit )
    {
        int unitIndex = -1;
        for ( int i = 0; i < timeWithOrWithoutUnit.length(); i++ )
        {
            char ch = timeWithOrWithoutUnit.charAt( i );
            if ( !Character.isDigit( ch ) )
            {
                unitIndex = i;
                break;
            }
        }
        if ( unitIndex == -1 )
        {
            return DEFAULT_TIME_UNIT.toMillis( Integer.parseInt( timeWithOrWithoutUnit ) );
        }
        else
        {
            int amount = Integer.parseInt( timeWithOrWithoutUnit.substring( 0, unitIndex ) );
            String unit = timeWithOrWithoutUnit.substring( unitIndex ).toLowerCase();
            TimeUnit timeUnit = null;
            int multiplyFactor = 1;
            if ( unit.equals( "ms" ) )
            {
                timeUnit = TimeUnit.MILLISECONDS;
            }
            else if ( unit.equals( "s" ) )
            {
                timeUnit = TimeUnit.SECONDS;
            }
            else if ( unit.equals( "m" ) )
            {
                // This is only for having to rely on 1.6
                timeUnit = TimeUnit.SECONDS;
                multiplyFactor = 60;
            }
            else
            {
                throw new RuntimeException( "Unrecognized unit " + unit );
            }
            return timeUnit.toMillis( amount*multiplyFactor );
        }
    }
}