| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.datasketches.hll; |
| |
| import static org.apache.datasketches.hll.HllUtil.EMPTY; |
| import static org.apache.datasketches.hll.HllUtil.pair; |
| |
| /** |
| * Iterates over an on-heap HLL byte array producing pairs of index, value. |
| * |
| * @author Lee Rhodes |
| */ |
| abstract class HllPairIterator extends PairIterator { |
| final int lengthPairs; |
| int index; |
| int value; |
| |
| //Used by Direct<4,6,8>Array, Heap<4,6,8>Array |
| HllPairIterator(final int lengthPairs) { |
| this.lengthPairs = lengthPairs; |
| index = - 1; |
| } |
| |
| @Override |
| public String getHeader() { |
| return String.format("%10s%6s", "Slot", "Value"); |
| } |
| |
| @Override |
| public int getIndex() { |
| return index; |
| } |
| |
| @Override |
| public int getKey() { |
| return index; |
| } |
| |
| @Override |
| public int getPair() { |
| return pair(index, value); |
| } |
| |
| @Override |
| public int getSlot() { |
| return index; |
| } |
| |
| @Override |
| public String getString() { |
| final int slot = getSlot(); |
| final int value = getValue(); |
| return String.format("%10d%6d", slot, value); |
| } |
| |
| @Override |
| public int getValue() { |
| return value; |
| } |
| |
| @Override |
| public boolean nextAll() { |
| if (++index < lengthPairs) { |
| value = value(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean nextValid() { |
| while (++index < lengthPairs) { |
| value = value(); |
| if (value != EMPTY) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| abstract int value(); |
| |
| } |