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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.adapter.jdbc.consumer; | |
19 | ||
20 | import java.sql.ResultSet; | |
21 | import java.sql.SQLException; | |
22 | ||
23 | import org.apache.arrow.vector.IntVector; | |
24 | ||
25 | /** | |
26 | * Consumer which consume int type values from {@link ResultSet}. | |
27 | * Write the data to {@link org.apache.arrow.vector.IntVector}. | |
28 | */ | |
29 | public class IntConsumer { | |
30 | ||
31 | /** | |
32 | * Creates a consumer for {@link IntVector}. | |
33 | */ | |
34 | public static JdbcConsumer<IntVector> createConsumer(IntVector vector, int index, boolean nullable) { | |
35 | if (nullable) { | |
36 | return new NullableIntConsumer(vector, index); | |
37 | } else { | |
38 | return new NonNullableIntConsumer(vector, index); | |
39 | } | |
40 | } | |
41 | ||
42 | /** | |
43 | * Nullable consumer for int. | |
44 | */ | |
45 | static class NullableIntConsumer extends BaseConsumer<IntVector> { | |
46 | ||
47 | /** | |
48 | * Instantiate a IntConsumer. | |
49 | */ | |
50 | public NullableIntConsumer(IntVector vector, int index) { | |
51 | super(vector, index); | |
52 | } | |
53 | ||
54 | @Override | |
55 | public void consume(ResultSet resultSet) throws SQLException { | |
56 | int value = resultSet.getInt(columnIndexInResultSet); | |
57 | if (!resultSet.wasNull()) { | |
58 | // for fixed width vectors, we have allocated enough memory proactively, | |
59 | // so there is no need to call the setSafe method here. | |
60 | vector.set(currentIndex, value); | |
61 | } | |
62 | currentIndex++; | |
63 | } | |
64 | } | |
65 | ||
66 | /** | |
67 | * Non-nullable consumer for int. | |
68 | */ | |
69 | static class NonNullableIntConsumer extends BaseConsumer<IntVector> { | |
70 | ||
71 | /** | |
72 | * Instantiate a IntConsumer. | |
73 | */ | |
74 | public NonNullableIntConsumer(IntVector vector, int index) { | |
75 | super(vector, index); | |
76 | } | |
77 | ||
78 | @Override | |
79 | public void consume(ResultSet resultSet) throws SQLException { | |
80 | int value = resultSet.getInt(columnIndexInResultSet); | |
81 | // for fixed width vectors, we have allocated enough memory proactively, | |
82 | // so there is no need to call the setSafe method here. | |
83 | vector.set(currentIndex, value); | |
84 | currentIndex++; | |
85 | } | |
86 | } | |
87 | } |