/*
**************************************************************************
* Copyright (C) 2004, International Business Machines Corporation and *
* others. All Rights Reserved. *
**************************************************************************
*
*/
package com.ibm.icu.dev.test.timescale;
import com.ibm.icu.dev.test.TestFmwk;
import com.ibm.icu.util.UniversalTimeScale;
import com.ibm.icu.math.BigDecimal;
import java.util.Random;
/**
* This class tests the UniversalTimeScale class by
* generating ramdon values in range and making sure
* that they round-trip correctly.
*/
public class TimeScaleMonkeyTest extends TestFmwk
{
/**
* The default constructor.
*/
public TimeScaleMonkeyTest()
{
}
private static final int LOOP_COUNT = 1000;
private static final BigDecimal longMax = new BigDecimal(Long.MAX_VALUE);
private Random ran = null;
private long ranInt;
private long ranMin;
private long ranMax;
private void initRandom(long min, long max)
{
BigDecimal interval = new BigDecimal(max).subtract(new BigDecimal(min));
ranMin = min;
ranMax = max;
ranInt = 0;
if (ran == null) {
ran = createRandom();
}
if (interval.compareTo(longMax) < 0) {
ranInt = interval.longValue();
}
}
private final long randomInRange()
{
long value;
if (ranInt != 0) {
value = ran.nextLong() % ranInt;
if (value < 0) {
value = -value;
}
value += ranMin;
} else {
do {
value = ran.nextLong();
} while (value < ranMin || value > ranMax);
}
return value;
}
public void TestRoundTrip()
{
for (int scale = 0; scale < UniversalTimeScale.MAX_SCALE; scale += 1) {
long fromMin = UniversalTimeScale.getTimeScaleValue(scale, UniversalTimeScale.FROM_MIN_VALUE);
long fromMax = UniversalTimeScale.getTimeScaleValue(scale, UniversalTimeScale.FROM_MAX_VALUE);
int i = 0;
initRandom(fromMin, fromMax);
while (i < LOOP_COUNT) {
long value = randomInRange();
long rt = UniversalTimeScale.toLong(UniversalTimeScale.from(value, scale), scale);
if (rt != value) {
errln("Round-trip error: time scale = " + scale + ", value = " + value + ", round-trip = " + rt);
}
i += 1;
}
}
}
public static void main(String[] args)
{
new TimeScaleMonkeyTest().run(args);
}
}