/*******************************************************************************
* Copyright (c) 2001-2005 Sasa Markovic and Ciaran Treanor.
* Copyright (c) 2011 The OpenNMS Group, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*******************************************************************************/
package org.jrobin.data;
/**
* <p>Interface to be used for custom datasources.
* If you wish to use a custom datasource in a graph, you should create a class implementing this interface
* that represents that datasource, and then pass this class on to the RrdGraphDef.</p>
*/
public abstract class Plottable {
/**
* Retrieves datapoint value based on a given timestamp.
* Use this method if you only have one series of data in this class.
*
* @param timestamp Timestamp in seconds for the datapoint.
* @return Double value of the datapoint.
*/
public double getValue(long timestamp) {
return Double.NaN;
}
}