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TimeVariance.java
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180 lines (143 loc) · 4.55 KB
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/*
* Copyright 1990-2008, Mark Little, University of Newcastle upon Tyne
* and others contributors as indicated
* by the @authors tag. All rights reserved.
* See the copyright.txt in the distribution for a
* full listing of individual contributors.
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License, v. 2.1.
* This program is distributed in the hope that it will be useful, but WITHOUT A
* 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,
* v.2.1 along with this distribution; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*
* (C) 1990-2008,
*/
package org.javasim.stats;
import java.io.*;
import org.javasim.SimulationProcess;
/**
* Obtain the average value given during the simulation time.
*/
public class TimeVariance extends Variance
{
public TimeVariance()
{
reset();
}
/**
* Zero the statistics.
*/
public void reset ()
{
first = true;
startTime = currentValue = 0.0;
stime = total = 0.0;
super.reset();
}
/**
* @param value Add to the instance, updating the statistics.
*/
public void setValue (double value) throws IllegalArgumentException
{
super.setValue(value);
if (!first)
{
total += area();
if (value == currentValue)
return;
}
else
{
first = false;
startTime = SimulationProcess.currentTime();
}
store(value);
}
/**
* @return the average value given up to the current simulation time.
*/
public double timeAverage ()
{
if (first || (SimulationProcess.currentTime() - startTime) == 0)
return 0.0;
return ((total + area()) / (SimulationProcess.currentTime() - startTime));
}
/**
* Save the state of the histogram to the file named 'fileName'.
*
* @param fileName the file to use.
* @return <code>true</code> if it succeeds, <code>false</code> otherwise.
*/
public boolean saveState (String fileName) throws IOException
{
FileOutputStream f = new FileOutputStream(fileName);
DataOutputStream oFile = new DataOutputStream(f);
boolean res = saveState(oFile);
f.close();
return res;
}
/**
* Save the state of the histogram to the stream 'oFile'.
*
* @param oFile the stream to use.
* @return <code>true</code> if it succeeds, <code>false</code> otherwise.
*/
public boolean saveState (DataOutputStream oFile) throws IOException
{
oFile.writeBoolean(first);
oFile.writeDouble(startTime);
oFile.writeDouble(currentValue);
oFile.writeDouble(stime);
oFile.writeDouble(total);
return super.saveState(oFile);
}
/**
* Restore the histogram state from the file 'fileName'.
*
* @param fileName the file to use.
* @return <code>true</code> if it succeeds, <code>false</code> otherwise.
*/
public boolean restoreState (String fileName) throws FileNotFoundException,
IOException
{
FileInputStream f = new FileInputStream(fileName);
DataInputStream iFile = new DataInputStream(f);
boolean res = restoreState(iFile);
f.close();
return res;
}
/**
* Restore the histogram state from the stream 'iFile'.
*
* @param iFile the stream to use.
* @return <code>true</code> if it succeeds, <code>false</code> otherwise.
*/
public boolean restoreState (DataInputStream iFile) throws IOException
{
first = iFile.readBoolean();
startTime = iFile.readDouble();
currentValue = iFile.readDouble();
stime = iFile.readDouble();
total = iFile.readDouble();
return super.restoreState(iFile);
}
private double area ()
{
return (currentValue * (SimulationProcess.currentTime() - stime));
}
private void store (double value)
{
currentValue = value;
stime = SimulationProcess.currentTime();
}
private boolean first;
private double startTime;
private double currentValue;
private double stime;
private double total;
}