1 /*
2 * This file is part of *** M y C o R e ***
3 * See http://www.mycore.de/ for details.
4 *
5 * MyCoRe is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * MyCoRe 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
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with MyCoRe. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 package org.mycore.datamodel.objectinfo;
20
21 import org.mycore.common.config.MCRConfiguration2;
22 import org.mycore.datamodel.common.MCRObjectIDDate;
23 import org.mycore.datamodel.metadata.MCRObjectID;
24
25 import java.util.List;
26
27 /**
28 * Allows to query objects using {@link MCRObjectQuery}.
29 */
30 public interface MCRObjectQueryResolver {
31
32 /**
33 * Gets all object info which match the restrictions of the query
34 * @param objectQuery the query
35 * @return the ids of the objects
36 */
37 List<MCRObjectID> getIds(MCRObjectQuery objectQuery);
38
39 /**
40 * Gets all the object info which match the restrictions of the query
41 * @param objectQuery the query
42 * @return the ids and dates of the object info
43 */
44 List<MCRObjectIDDate> getIdDates(MCRObjectQuery objectQuery);
45
46 /**
47 * Gets all the object info which match the restrictions of the query
48 * @param objectQuery the query
49 * @return the info
50 */
51 List<MCRObjectInfo> getInfos(MCRObjectQuery objectQuery);
52
53 /**
54 * Gets the count of object info which match the restrictions of query ignoring limit and offset
55 * @param objectQuery the query
56 * @return the count of the object info
57 */
58 int count(MCRObjectQuery objectQuery);
59
60 static MCRObjectQueryResolver getInstance() {
61 return InstanceHolder.RESOLVER;
62 }
63
64 class InstanceHolder {
65 private static final String QUERY_RESOLVER_CLASS_PROPERTY = "MCR.Object.QueryResolver.Class";
66
67 private static final MCRObjectQueryResolver RESOLVER
68 = MCRConfiguration2.<MCRObjectQueryResolver>getSingleInstanceOf(QUERY_RESOLVER_CLASS_PROPERTY)
69 .orElseThrow(() -> MCRConfiguration2.createConfigurationException(QUERY_RESOLVER_CLASS_PROPERTY));
70 }
71 }