| /* |
| * 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.druid.segment; |
| |
| import com.google.common.collect.Lists; |
| import it.unimi.dsi.fastutil.ints.IntIterator; |
| import it.unimi.dsi.fastutil.objects.Object2IntRBTreeMap; |
| import it.unimi.dsi.fastutil.objects.Object2IntSortedMap; |
| import org.apache.druid.java.util.common.guava.Comparators; |
| |
| import java.util.List; |
| |
| /** |
| * Creates a sorted dictionary given some existing dictionary, storing a mapping of both sorted id to unsorted id |
| * and unsorted id to sorted id |
| */ |
| public class SortedDimensionDictionary<T extends Comparable<T>> |
| { |
| private final List<T> sortedVals; |
| private final int[] idToIndex; |
| private final int[] indexToId; |
| |
| public SortedDimensionDictionary(List<T> idToValue, int length) |
| { |
| Object2IntSortedMap<T> sortedMap = new Object2IntRBTreeMap<>(Comparators.naturalNullsFirst()); |
| for (int id = 0; id < length; id++) { |
| T value = idToValue.get(id); |
| sortedMap.put(value, id); |
| } |
| this.sortedVals = Lists.newArrayList(sortedMap.keySet()); |
| this.idToIndex = new int[length]; |
| this.indexToId = new int[length]; |
| int index = 0; |
| for (IntIterator iterator = sortedMap.values().iterator(); iterator.hasNext(); ) { |
| int id = iterator.nextInt(); |
| idToIndex[id] = index; |
| indexToId[index] = id; |
| index++; |
| } |
| } |
| |
| public int getUnsortedIdFromSortedId(int index) |
| { |
| return indexToId[index]; |
| } |
| |
| public int getSortedIdFromUnsortedId(int id) |
| { |
| return idToIndex[id]; |
| } |
| |
| public T getValueFromSortedId(int index) |
| { |
| return sortedVals.get(index); |
| } |
| } |