1 /**
2 * This file Copyright (c) 2019 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.ui.framework.datasource.impl;
35
36 import info.magnolia.ui.contentapp.DataFilter;
37
38 import java.util.Arrays;
39 import java.util.stream.Stream;
40
41 import javax.inject.Inject;
42
43 import com.vaadin.data.provider.AbstractDataProvider;
44 import com.vaadin.data.provider.DataProvider;
45 import com.vaadin.data.provider.Query;
46
47 /**
48 * Enum-based {@link DataProvider} implementation.
49 */
50 public final class EnumDataProvider<T extends Enum<T>> extends AbstractDataProvider<T, DataFilter> {
51
52 private final EnumDatasourceDefinition<T> definition;
53
54 @Inject
55 public EnumDataProvider(EnumDatasourceDefinition<T> definition) {
56 this.definition = definition;
57 }
58
59 @Override
60 public boolean isInMemory() {
61 return true;
62 }
63
64 @Override
65 public int size(Query<T, DataFilter> query) {
66 return (int) fetch(query).count();
67 }
68
69 @Override
70 public Stream<T> fetch(Query<T, DataFilter> query) {
71 return Arrays.stream(definition.getEntityType().getEnumConstants());
72 }
73 }