Method: MapValueMerger()

1: /**
2: * Copyright (C) 2020 Czech Technical University in Prague
3: *
4: * This program is free software: you can redistribute it and/or modify it under
5: * the terms of the GNU General Public License as published by the Free Software
6: * Foundation, either version 3 of the License, or (at your option) any
7: * later version.
8: *
9: * This program is distributed in the hope that it will be useful, but WITHOUT
10: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11: * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
12: * details. You should have received a copy of the GNU General Public License
13: * along with this program. If not, see <http://www.gnu.org/licenses/>.
14: */
15: package cz.cvut.kbss.jopa.sessions.merge;
16:
17: import cz.cvut.kbss.jopa.model.descriptors.Descriptor;
18: import cz.cvut.kbss.jopa.model.metamodel.FieldSpecification;
19: import cz.cvut.kbss.jopa.utils.CollectionFactory;
20: import cz.cvut.kbss.jopa.utils.EntityPropertiesUtils;
21:
22: import java.util.Map;
23:
24: public class MapValueMerger implements ValueMerger {
25:
26:
27: @Override
28: public void mergeValue(FieldSpecification<?, ?> att, Object target, Object originalValue, Object mergedValue,
29: Descriptor attributeDescriptor) {
30: final Map<?, ?> mergedMap = (Map<?, ?>) mergedValue;
31: // This is a simplified version which will work only for the @Properties attributes
32: // Bus since JOPA does not currently support any other use of Maps, it should be ok
33:
34: if (mergedMap == null) {
35: EntityPropertiesUtils.setFieldValue(att.getJavaField(), target, null);
36: return;
37: }
38:
39: final Map<Object, Object> newMap = CollectionFactory.createDefaultMap();
40: newMap.putAll(mergedMap);
41: EntityPropertiesUtils.setFieldValue(att.getJavaField(), target, newMap);
42: }
43: }