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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.impl; | |
19 | ||
20 | ||
21 | import org.apache.arrow.vector.complex.AbstractContainerVector; | |
22 | import org.apache.arrow.vector.complex.reader.FieldReader; | |
23 | import org.apache.arrow.vector.complex.writer.BaseWriter.ListWriter; | |
24 | import org.apache.arrow.vector.complex.writer.BaseWriter.StructWriter; | |
25 | import org.apache.arrow.vector.types.Types.MinorType; | |
26 | ||
27 | /** | |
28 | * An implementation of {@link AbstractFieldReader} for lists vectors. | |
29 | */ | |
30 | @SuppressWarnings("unused") | |
31 | public class SingleListReaderImpl extends AbstractFieldReader { | |
32 | ||
33 | private final String name; | |
34 | private final AbstractContainerVector container; | |
35 | private FieldReader reader; | |
36 | ||
37 | /** | |
38 | * Constructs a new instance. | |
39 | * | |
40 | * @param name The name of field to read in container. | |
41 | * @param container The container holding a list. | |
42 | */ | |
43 | public SingleListReaderImpl(String name, AbstractContainerVector container) { | |
44 | super(); | |
45 | this.name = name; | |
46 | this.container = container; | |
47 | } | |
48 | ||
49 | @Override | |
50 | public void setPosition(int index) { | |
51 | super.setPosition(index); | |
52 | if (reader != null) { | |
53 | reader.setPosition(index); | |
54 | } | |
55 | } | |
56 | ||
57 | @Override | |
58 | public Object readObject() { | |
59 | return reader.readObject(); | |
60 | } | |
61 | ||
62 | @Override | |
63 | public FieldReader reader() { | |
64 | if (reader == null) { | |
65 | reader = container.getChild(name).getReader(); | |
66 | setPosition(idx()); | |
67 | } | |
68 | return reader; | |
69 | } | |
70 | ||
71 | @Override | |
72 | public MinorType getMinorType() { | |
73 | return MinorType.LIST; | |
74 | } | |
75 | ||
76 | @Override | |
77 | public boolean isSet() { | |
78 | return false; | |
79 | } | |
80 | ||
81 | @Override | |
82 | public void copyAsValue(ListWriter writer) { | |
83 | throw new UnsupportedOperationException("Generic list copying not yet supported. Please resolve to typed list."); | |
84 | } | |
85 | ||
86 | @Override | |
87 | public void copyAsField(String name, StructWriter writer) { | |
88 | throw new UnsupportedOperationException("Generic list copying not yet supported. Please resolve to typed list."); | |
89 | } | |
90 | ||
91 | } |