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package edu.ucsb.cs.nws.nwsprotocol;
import java.io.*;
import java.net.*;
/**
* The NwsForecastAPI implements the FORECAST_API calls. It defines the data
* structures too (measurement and forecast and the like).
*/
public class NwsForecastAPI {
/** A single forecast generated from a list of Measurements. */
public static class Forecast {
/** The forecast of the next value in the series. */
public double forecast;
/** An estimation of the accuracy of the forecast. */
public double error;
/** The index of the method that
* produced the forecast */
public int methodUsed;
/** Produces a Forecast with the specified field values. */
public Forecast(double forecast,
double error,
int methodUsed) {
this.forecast = forecast;
this.error = error;
this.methodUsed = methodUsed;
}
/** Produces a Forecast initialized by reading <i>stream</i>. */
public Forecast(DataInputStream stream) throws Exception {
forecast = stream.readDouble();
error = stream.readDouble();
methodUsed = stream.readInt();
}
/** Returns the fields of the Forecast converted to a
* byte array. */
public byte[] toBytes() {
byte[][] allBytes = {NwsMessage.toBytes(forecast),
NwsMessage.toBytes(error),
NwsMessage.toBytes(methodUsed)};
return NwsMessage.concatenateBytes(allBytes);
}
}
/** A set of forecast information produced from a single measurement. */
public static class ForecastCollection {
public static final int FORECAST_TYPE_COUNT = 2;
public static final int MAE_FORECAST = 0;
public static final int MSE_FORECAST = 1;
/** The measurement from which the forecasts were produced. */
public Measurement measurement;
/** A pair of forecasts based on the methods which
* produce the lowest mean absolute error and mean square
* error. */
public Forecast[] forecasts;
/** Produces a ForecastCollection with the specified
* field values. */
public ForecastCollection(Measurement measurement,
Forecast[] forecasts) {
this.measurement = measurement;
this.forecasts = forecasts;
}
/** Produces a ForecastCollection initialized by reading
* <i>stream</i>. */
public ForecastCollection(DataInputStream stream) throws Exception {
measurement = new Measurement(stream);
forecasts = new Forecast[FORECAST_TYPE_COUNT];
for(int i = 0; i < FORECAST_TYPE_COUNT; i++)
forecasts[i] = new Forecast(stream);
}
/** Returns the fields of the ForecastCollection
* converted to a byte array. */
public byte[] toBytes() {
byte[][] allBytes = {measurement.toBytes(),
forecasts[MAE_FORECAST].toBytes(),
forecasts[MSE_FORECAST].toBytes()};
return NwsMessage.concatenateBytes(allBytes);
}
}
/** A single measurement of resource availability. */
public static class Measurement {
/** The time (seconds since midnight 1/1/1970) the
* measurement was taken. */
public double timeStamp;
/** The observed availability at that time. */
public double measurement;
/** Produces a Measurement with the specified field values. */
public Measurement( double timeStamp,
double measurement) {
this.timeStamp = timeStamp;
this.measurement = measurement;
}
/** Produces a Measurement initialized by reading
* <i>stream</i>. */
public Measurement(DataInputStream stream) throws Exception {
timeStamp = stream.readDouble();
measurement = stream.readDouble();
}
/** Returns the fields of the Measurement converted to a
* byte array. */
public byte[] toBytes() {
byte[][] allBytes = {NwsMessage.toBytes(timeStamp),
NwsMessage.toBytes(measurement)};
return NwsMessage.concatenateBytes(allBytes);
}
}
}
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