| /* |
| * 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 org.apache.datasketches.memory.Memory; |
| |
| /** |
| * Iterates within a given Memory extracting integer pairs. |
| * |
| * @author Lee Rhodes |
| */ |
| public class IntMemoryPairIterator extends PairIterator { |
| private final Memory mem; |
| private final long offsetBytes; |
| private final int arrLen; |
| private final int slotMask; |
| private int index; |
| private int pair; |
| |
| //Used by DirectAuxHashMap, DirectCouponList |
| IntMemoryPairIterator( |
| final Memory mem, final long offsetBytes, final int arrayLength, final int lgConfigK) { |
| this.mem = mem; |
| this.offsetBytes = offsetBytes; |
| this.arrLen = arrayLength; |
| slotMask = (1 << lgConfigK) - 1; |
| index = -1; |
| } |
| |
| IntMemoryPairIterator(final byte[] byteArr, final long offsetBytes, final int lengthPairs, |
| final int lgConfigK) { |
| this(Memory.wrap(byteArr), offsetBytes, lengthPairs, lgConfigK); |
| } |
| |
| @Override |
| public int getIndex() { |
| return index; |
| } |
| |
| @Override |
| public int getKey() { |
| return HllUtil.getPairLow26(pair); |
| } |
| |
| @Override |
| public int getPair() { |
| return pair; |
| } |
| |
| @Override |
| public int getSlot() { |
| return getKey() & slotMask; |
| } |
| |
| @Override |
| public int getValue() { |
| return HllUtil.getPairValue(pair); |
| } |
| |
| @Override |
| public boolean nextAll() { |
| if (++index < arrLen) { |
| pair = pair(); |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public boolean nextValid() { |
| while (++index < arrLen) { |
| final int pair = pair(); |
| if (pair != EMPTY) { |
| this.pair = pair; |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| int pair() { |
| return mem.getInt(offsetBytes + (index << 2)); |
| } |
| |
| } |