Java Code Examples for java.util.BitSet#previousClearBit()

The following examples show how to use java.util.BitSet#previousClearBit() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: TestTolerantUpdateProcessorRandomCloud.java From lucene-solr with Apache License 2.0

6 votes

/**
 * Given a BitSet, returns a random bit that is currently false, or -1 if all bits are true.
 * NOTE: this method is not fair.
 */
public static final int randomUnsetBit(Random r, BitSet bits, final int max) {
  // NOTE: don't forget, BitSet will grow automatically if not careful
  if (bits.cardinality() == max+1) {
    return -1;
  }
  final int candidate = TestUtil.nextInt(r, 0, max);
  if (bits.get(candidate)) {
    final int lo = bits.previousClearBit(candidate);
    final int hi = bits.nextClearBit(candidate);
    if (lo < 0 && max < hi) {
      fail("how the hell did we not short circut out? card="+bits.cardinality()+"/size="+bits.size());
    } else if (lo < 0) {
      return hi;
    } else if (max < hi) {
      return lo;
    } // else...
    return ((candidate - lo) < (hi - candidate)) ? lo : hi;
  }
  return candidate;
}

Example 2

Source File: ConcurrentOpenLongPairRangeSet.java From pulsar with Apache License 2.0

6 votes

@Override
public Range<T> rangeContaining(long key, long value) {
    BitSet rangeBitSet = rangeBitSetMap.get(key);
    if (rangeBitSet != null) {
        if (!rangeBitSet.get(getSafeEntry(value))) {
            // if position is not part of any range then return null
            return null;
        }
        int lowerValue = rangeBitSet.previousClearBit(getSafeEntry(value)) + 1;
        final T lower = consumer.apply(key, lowerValue);
        final T upper = consumer.apply(key,
                Math.max(rangeBitSet.nextClearBit(getSafeEntry(value)) - 1, lowerValue));
        return Range.closed(lower, upper);
    }
    return null;
}