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1 | // Licensed to the Apache Software Foundation (ASF) under one or more |
2 | // contributor license agreements. See the NOTICE file distributed with | |
3 | // this work for additional information regarding copyright ownership. | |
4 | // The ASF licenses this file to You under the Apache License, Version 2.0 | |
5 | // (the "License"); you may not use this file except in compliance with | |
6 | // the License. You may obtain a copy of the License at | |
7 | // | |
8 | // http://www.apache.org/licenses/LICENSE-2.0 | |
9 | // | |
10 | // Unless required by applicable law or agreed to in writing, software | |
11 | // distributed under the License is distributed on an "AS IS" BASIS, | |
12 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | // See the License for the specific language governing permissions and | |
14 | // limitations under the License. | |
15 | ||
16 | using System; | |
17 | using System.IO; | |
18 | using Apache.Arrow.Types; | |
19 | ||
20 | namespace Apache.Arrow | |
21 | { | |
22 | public class DictionaryArray : Array | |
23 | { | |
24 | public IArrowArray Dictionary { get; } | |
25 | public IArrowArray Indices { get; } | |
26 | public ArrowBuffer IndicesBuffer => Data.Buffers[1]; | |
27 | ||
28 | public DictionaryArray(ArrayData data) : base(data) | |
29 | { | |
30 | data.EnsureBufferCount(2); | |
31 | data.EnsureDataType(ArrowTypeId.Dictionary); | |
32 | ||
33 | if (data.Dictionary == null) | |
34 | { | |
35 | throw new ArgumentException($"{nameof(data.Dictionary)} must not be null"); | |
36 | } | |
37 | ||
38 | var dicType = (DictionaryType)data.DataType; | |
39 | data.Dictionary.EnsureDataType(dicType.ValueType.TypeId); | |
40 | ||
41 | var indicesData = new ArrayData(dicType.IndexType, data.Length, data.NullCount, data.Offset, data.Buffers, data.Children); | |
42 | ||
43 | Indices = ArrowArrayFactory.BuildArray(indicesData); | |
44 | Dictionary = ArrowArrayFactory.BuildArray(data.Dictionary); | |
45 | } | |
46 | ||
47 | public DictionaryArray(DictionaryType dataType, IArrowArray indicesArray, IArrowArray dictionary) : | |
48 | base(new ArrayData(dataType, indicesArray.Length, indicesArray.Data.NullCount, indicesArray.Data.Offset, indicesArray.Data.Buffers, indicesArray.Data.Children, dictionary.Data)) | |
49 | { | |
50 | Data.EnsureBufferCount(2); | |
51 | ||
52 | indicesArray.Data.EnsureDataType(dataType.IndexType.TypeId); | |
53 | dictionary.Data.EnsureDataType(dataType.ValueType.TypeId); | |
54 | ||
55 | Indices = indicesArray; | |
56 | Dictionary = dictionary; | |
57 | } | |
58 | ||
59 | public override void Accept(IArrowArrayVisitor visitor) => Accept(this, visitor); | |
60 | } | |
61 | } |