/**
* @param start Start time
* @return Index sample with time stamp at-or-before start time, or -1.
*/
private int findSampleLessOrEqual(final Instant start) {
// Would like to use PlotSampleSearch, but that operates on array
// of PlotSample[]
int low = 0;
int high = samples.size() - 1;
int cmp = 0;
int mid = -1;
while (low <= high) {
mid = (low + high) / 2;
// Compare 'mid' sample to goal
final Instant time = samples.get(mid).getPosition();
final int compare = time.compareTo(start);
if (compare > 0) { // 'mid' too big, search lower half
cmp = 1;
high = mid - 1;
} else if (compare < 0) { // 'mid' too small, search upper half
cmp = -1;
low = mid + 1;
} else {
cmp = 0;
return mid; // found exact time
}
}
// Didn't find exact match.
if (cmp < 0) // 'mid' sample is smaller than x, so it's OK
return mid;
// cmp > 0, 'mid' sample is greater than x.
// If there is a sample before, use that
if (mid > 0) return mid - 1;
return -1;
}
/** Returns the maximum between the two specified {@link Timestamp}. */
public static Instant max(Instant t1, Instant t2) {
if (t1 == null || t2 == null) return null;
if (t1.compareTo(t2) >= 0) return t1;
else return t2;
}