public Builder add(Slice slice) {
assert comparator.compare(slice.start(), slice.end()) <= 0;
if (slices.size() > 0
&& comparator.compare(slices.get(slices.size() - 1).end(), slice.start()) > 0)
needsNormalizing = true;
slices.add(slice);
return this;
}
public boolean selects(Clustering clustering) {
for (int i = 0; i < slices.length; i++) {
Slice slice = slices[i];
if (comparator.compare(clustering, slice.start()) < 0) return false;
if (comparator.compare(clustering, slice.end()) <= 0) return true;
}
return false;
}
/**
* Given an array of slices (potentially overlapping and in any order) and return an equivalent
* array of non-overlapping slices in clustering order.
*
* @param slices an array of slices. This may be modified by this method.
* @return the smallest possible array of non-overlapping slices in clustering order. If the
* original slices are already non-overlapping and in comparator order, this may or may not
* return the provided slices directly.
*/
private List<Slice> normalize(List<Slice> slices) {
if (slices.size() <= 1) return slices;
Collections.sort(
slices,
new Comparator<Slice>() {
@Override
public int compare(Slice s1, Slice s2) {
int c = comparator.compare(s1.start(), s2.start());
if (c != 0) return c;
return comparator.compare(s1.end(), s2.end());
}
});
List<Slice> slicesCopy = new ArrayList<>(slices.size());
Slice last = slices.get(0);
for (int i = 1; i < slices.size(); i++) {
Slice s2 = slices.get(i);
boolean includesStart = last.includes(comparator, s2.start());
boolean includesFinish = last.includes(comparator, s2.end());
if (includesStart && includesFinish) continue;
if (!includesStart && !includesFinish) {
slicesCopy.add(last);
last = s2;
continue;
}
if (includesStart) {
last = Slice.make(last.start(), s2.end());
continue;
}
assert !includesFinish;
}
slicesCopy.add(last);
return slicesCopy;
}
public static ComponentOfSlice fromSlice(int component, Slice slice) {
Slice.Bound start = slice.start();
Slice.Bound end = slice.end();
if (component >= start.size() && component >= end.size()) return null;
boolean startInclusive = true, endInclusive = true;
ByteBuffer startValue = null, endValue = null;
if (component < start.size()) {
startInclusive = start.isInclusive();
startValue = start.get(component);
}
if (component < end.size()) {
endInclusive = end.isInclusive();
endValue = end.get(component);
}
return new ComponentOfSlice(startInclusive, startValue, endInclusive, endValue);
}
/**
* Creates a {@code Slices} object that contains a single slice.
*
* @param comparator the comparator for the table {@code slice} is a slice of.
* @param slice the single slice that the return object should contains.
* @return the newly created {@code Slices} object.
*/
public static Slices with(ClusteringComparator comparator, Slice slice) {
if (slice.start() == Slice.Bound.BOTTOM && slice.end() == Slice.Bound.TOP) return Slices.ALL;
assert comparator.compare(slice.start(), slice.end()) <= 0;
return new ArrayBackedSlices(comparator, new Slice[] {slice});
}