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1 | /* |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | ||
18 | package org.apache.arrow.vector.complex; | |
19 | ||
20 | import org.apache.arrow.util.Preconditions; | |
21 | import org.apache.arrow.vector.UInt4Vector; | |
22 | ||
23 | /** | |
24 | * A helper class that is used to track and populate empty values in repeated value vectors. | |
25 | */ | |
26 | public class EmptyValuePopulator { | |
27 | private final UInt4Vector offsets; | |
28 | ||
29 | public EmptyValuePopulator(UInt4Vector offsets) { | |
30 | this.offsets = Preconditions.checkNotNull(offsets, "offsets cannot be null"); | |
31 | } | |
32 | ||
33 | /** | |
34 | * Marks all values since the last set as empty. The last set value is obtained from underlying offsets vector. | |
35 | * | |
36 | * @param lastIndex the last index (inclusive) in the offsets vector until which empty population takes place | |
37 | * @throws java.lang.IndexOutOfBoundsException if lastIndex is negative or greater than offsets capacity. | |
38 | */ | |
39 | public void populate(int lastIndex) { | |
40 | if (lastIndex < 0) { | |
41 | throw new IndexOutOfBoundsException("index cannot be negative"); | |
42 | } | |
43 | final int lastSet = Math.max(offsets.getValueCount() - 1, 0); | |
44 | final int previousEnd = offsets.get(lastSet); //0 ? 0 : accessor.get(lastSet); | |
45 | for (int i = lastSet; i < lastIndex; i++) { | |
46 | offsets.setSafe(i + 1, previousEnd); | |
47 | } | |
48 | offsets.setValueCount(lastIndex + 1); | |
49 | } | |
50 | ||
51 | } |