-
Notifications
You must be signed in to change notification settings - Fork 14
/
ResultSetSpliterator.java
81 lines (74 loc) · 2.99 KB
/
ResultSetSpliterator.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
/**
* Copyright (C) 2019 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.ontodriver.iteration;
import cz.cvut.kbss.ontodriver.ResultSet;
import cz.cvut.kbss.ontodriver.exception.OntoDriverException;
import cz.cvut.kbss.ontodriver.exception.OntoDriverRuntimeException;
import java.util.Objects;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.Consumer;
/**
* {@link Spliterator} implementation for a {@link ResultSet}.
* <p>
* Note that the methods wrap {@link OntoDriverException}s possibly thrown by the underlying result set in a {@link OntoDriverRuntimeException}
* in order to support the {@link Spliterator} API.
*/
public class ResultSetSpliterator extends Spliterators.AbstractSpliterator<ResultRow> {
private final ResultSet resultSet;
/**
* Creates a spliterator reporting unknown estimate size and the following characteristics:
* <ul>
* <li>{@link Spliterator#IMMUTABLE}</li>
* <li>{@link Spliterator#ORDERED}</li>
* <li>{@link Spliterator#NONNULL}</li>
* </ul>
*
* @param resultSet {@code ResultSet} on which the iteration will be performed
*/
public ResultSetSpliterator(ResultSet resultSet) {
super(Long.MAX_VALUE, Spliterator.IMMUTABLE | Spliterator.ORDERED | Spliterator.NONNULL);
this.resultSet = Objects.requireNonNull(resultSet);
}
@Override
public boolean tryAdvance(Consumer<? super ResultRow> action) {
Objects.requireNonNull(action);
try {
if (resultSet.hasNext()) {
resultSet.next();
action.accept(new DelegatingResultRow(resultSet));
return true;
} else {
return false;
}
} catch (OntoDriverException e) {
throw new OntoDriverRuntimeException(e);
}
}
@Override
public void forEachRemaining(Consumer<? super ResultRow> action) {
Objects.requireNonNull(action);
try {
// Row is just a view on the result set which does the actual iteration
final DelegatingResultRow row = new DelegatingResultRow(resultSet);
while (resultSet.hasNext()) {
resultSet.next();
action.accept(row);
}
} catch (OntoDriverException e) {
throw new OntoDriverRuntimeException(e);
}
}
}