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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.dictionary; | |
19 | ||
20 | import java.util.Objects; | |
21 | ||
22 | import org.apache.arrow.vector.FieldVector; | |
23 | import org.apache.arrow.vector.compare.VectorEqualsVisitor; | |
24 | import org.apache.arrow.vector.types.pojo.ArrowType; | |
25 | import org.apache.arrow.vector.types.pojo.DictionaryEncoding; | |
26 | ||
27 | /** | |
28 | * A dictionary (integer to Value mapping) that is used to facilitate | |
29 | * dictionary encoding compression. | |
30 | */ | |
31 | public class Dictionary { | |
32 | ||
33 | private final DictionaryEncoding encoding; | |
34 | private final FieldVector dictionary; | |
35 | ||
36 | public Dictionary(FieldVector dictionary, DictionaryEncoding encoding) { | |
37 | this.dictionary = dictionary; | |
38 | this.encoding = encoding; | |
39 | } | |
40 | ||
41 | public FieldVector getVector() { | |
42 | return dictionary; | |
43 | } | |
44 | ||
45 | public DictionaryEncoding getEncoding() { | |
46 | return encoding; | |
47 | } | |
48 | ||
49 | public ArrowType getVectorType() { | |
50 | return dictionary.getField().getType(); | |
51 | } | |
52 | ||
53 | @Override | |
54 | public String toString() { | |
55 | return "Dictionary " + encoding + " " + dictionary; | |
56 | } | |
57 | ||
58 | @Override | |
59 | public boolean equals(Object o) { | |
60 | if (this == o) { | |
61 | return true; | |
62 | } | |
63 | if (o == null || getClass() != o.getClass()) { | |
64 | return false; | |
65 | } | |
66 | Dictionary that = (Dictionary) o; | |
67 | return Objects.equals(encoding, that.encoding) && | |
68 | new VectorEqualsVisitor().vectorEquals(that.dictionary, dictionary); | |
69 | } | |
70 | ||
71 | @Override | |
72 | public int hashCode() { | |
73 | return Objects.hash(encoding, dictionary); | |
74 | } | |
75 | } |