Method: mergeValue(Object, ChangeRecord, Descriptor)

1: /*
2: * JOPA
3: * Copyright (C) 2024 Czech Technical University in Prague
4: *
5: * This library is free software; you can redistribute it and/or
6: * modify it under the terms of the GNU Lesser General Public
7: * License as published by the Free Software Foundation; either
8: * version 3.0 of the License, or (at your option) any later version.
9: *
10: * This library is distributed in the hope that it will be useful,
11: * but WITHOUT ANY WARRANTY; without even the implied warranty of
12: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13: * Lesser General Public License for more details.
14: *
15: * You should have received a copy of the GNU Lesser General Public
16: * License along with this library.
17: */
18: package cz.cvut.kbss.jopa.sessions.merge;
19:
20: import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
21: import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
22: import cz.cvut.kbss.jopa.sessions.change.ChangeRecord;
23: import cz.cvut.kbss.jopa.utils.CollectionFactory;
24: import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
25:
26: import java.util.Map;
27:
28: public class MapValueMerger implements ValueMerger {
29:
30: @Override
31: public void mergeValue(Object target, ChangeRecord changeRecord, Descriptor attributeDescriptor) {
32: final FieldSpecification<?, ?> att = changeRecord.getAttribute();
33: final Map<?, ?> mergedMap = (Map<?, ?>) changeRecord.getNewValue();
34: // This is a simplified version which will work only for the @Properties attributes
35: // Bus since JOPA does not currently support any other use of Maps, it should be ok
36:
37:• if (mergedMap == null) {
38: EntityPropertiesUtils.setFieldValue(att.getJavaField(), target, null);
39: return;
40: }
41:
42: final Map<Object, Object> newMap = CollectionFactory.createDefaultMap();
43: newMap.putAll(mergedMap);
44: EntityPropertiesUtils.setFieldValue(att.getJavaField(), target, newMap);
45: }
46: }