Method: checkForNoArgConstructor(Class)

1: /**
2: * Copyright (C) 2016 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.model.metamodel;
16:
17: import cz.cvut.kbss.jopa.exception.MetamodelInitializationException;
18: import cz.cvut.kbss.jopa.model.EntityTypeImpl;
19: import cz.cvut.kbss.jopa.model.IRI;
20: import cz.cvut.kbss.jopa.model.annotations.OWLClass;
21:
22: public class EntityClassProcessor {
23:
24: public <T> EntityTypeImpl<T> processEntityType(Class<T> cls) {
25: final OWLClass c = cls.getAnnotation(OWLClass.class);
26:
27: if (c == null) {
28: throw new MetamodelInitializationException("The class " + cls + " is not an OWLPersistence entity!");
29: }
30:
31: checkForNoArgConstructor(cls);
32:
33: return new EntityTypeImpl<>(cls.getSimpleName(), cls, IRI.create(c.iri()));
34: }
35:
36: private <T> void checkForNoArgConstructor(Class<T> cls) {
37: try {
38: cls.getDeclaredConstructor();
39: } catch (NoSuchMethodException e) {
40: throw new MetamodelInitializationException("Class " + cls + " is missing required no-arg constructor.");
41: }
42: }
43: }