How to use

copy

method

in

org.apache.lucene.util.ByteBlockPool

/**
 * Appends a copy of the given {@link BytesRef} to this {@link BytesRefList}.
 * @param bytes the bytes to append
 * @return the ordinal of the appended bytes
 */
public int append(BytesRef bytes) {
 if (lastElement >= offsets.length) {
  int oldLen = offsets.length;
  offsets = ArrayUtil.grow(offsets, offsets.length + 1);
  bytesUsed.addAndGet((offsets.length - oldLen)
    * RamUsageEstimator.NUM_BYTES_INT);
 }
 pool.copy(bytes);
 offsets[lastElement++] = currentOffset;
 currentOffset += bytes.length;
 return lastElement;
}