import java.util.*;

public class Configuration {
	public int interval;

	public int duration;

	public int departure;

	public void load(Properties props) throws ConfigurationException {
		String valueString;
		int value;

		valueString = props.getProperty("interval");
		if (valueString == null) {
			throw new ConfigurationException("monitor interval");
		}
		value = Integer.parseInt(valueString);
		if (value <= 0) {
			throw new ConfigurationException("monitor interval > 0");
		}
		interval = value;

		valueString = props.getProperty("duration");
		if (valueString == null) {
			throw new ConfigurationException("duration");
		}
		value = Integer.parseInt(valueString);
		if (value <= 0) {
			throw new ConfigurationException("duration > 0");
		}
		if ((value % interval) != 0) {
			throw new ConfigurationException("duration % interval");
		}
		duration = value;

		valueString = props.getProperty("departure");
		if (valueString == null) {
			throw new ConfigurationException("departure offset");
		}
		value = Integer.parseInt(valueString);
		if (value <= 0) {
			throw new ConfigurationException("departure > 0");
		}
		if ((value % interval) != 0) {
			throw new ConfigurationException("departure % interval");
		}
		departure = value;
	}
}

//duzo sie powtaza
//co jesci trzeba wczytac cos nowego
//pojedyncze wywolanie jesli chcey kolejne prpoerty
// podzielic na metody