-
Notifications
You must be signed in to change notification settings - Fork 14
/
ConverterResolver.java
60 lines (54 loc) · 2.6 KB
/
ConverterResolver.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
/**
* Copyright (C) 2019 Czech Technical University in Prague
* <p>
* 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.
* <p>
* 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.jopa.model.metamodel;
import cz.cvut.kbss.jopa.oom.converter.ConverterWrapper;
import cz.cvut.kbss.jopa.oom.converter.EnumConverter;
import cz.cvut.kbss.jopa.oom.converter.ToLexicalFormConverter;
import java.lang.reflect.Field;
import java.util.Optional;
/**
* Determines potential converters which may be used on a field.
* <p>
* Currently, only built-in converters for data and annotation property attributes are supported, but in the future,
* custom converters should be also supported.
*/
class ConverterResolver {
private final Converters converters;
ConverterResolver(Converters converters) {
this.converters = converters;
}
/**
* Determines converter which should be used for transformation of values to and from the specified field.
* <p>
* Besides custom converters, the system supports a number of built-in converters, which ensure that e.g. widening
* conversion or mapping to Java 8 Date/Time API is supported.
*
* @param field The field for which converter should be determined
* @param config Mapping configuration extracted during metamodel building
* @return Possible converter instance to be used for transformation of values of the specified field. Returns empty
* {@code Optional} if no suitable converter is found (or needed)
*/
public Optional<ConverterWrapper<?, ?>> resolveConverter(Field field, PropertyAttributes config) {
if (config.getPersistentAttributeType() == Attribute.PersistentAttributeType.OBJECT) {
return Optional.empty();
}
final Class<?> attValueType = config.getType().getJavaType();
if (attValueType.isEnum()) {
return Optional.of(new EnumConverter(attValueType));
}
if (config.isLexicalForm()) {
return Optional.of(new ToLexicalFormConverter());
}
return converters.getConverter(attValueType);
}
}