1 /**
2 * This file Copyright (c) 2018 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.contentapp;
35
36 import info.magnolia.ui.framework.ioc.Destructible;
37
38 import java.util.stream.Stream;
39
40 import com.vaadin.data.provider.DataProviderWrapper;
41 import com.vaadin.data.provider.HierarchicalDataProvider;
42 import com.vaadin.data.provider.HierarchicalQuery;
43
44 /**
45 * Abstract wrapper class of {@link HierarchicalDataProvider}. Similar to Vaadin's own
46 * {@link DataProviderWrapper data provider wrapper}, but for some
47 * reason framework does not provide its own variation for the hierarchical providers.
48 *
49 * @param <T>
50 * data type
51 * @param <F>
52 * filter type
53 */
54 public abstract class HierarchicalDataProviderWrapper<T, F> extends DataProviderWrapper<T, F, F> implements HierarchicalDataProvider<T, F>, Destructible {
55
56 private Runnable preFetchProcessor = () -> {};
57
58 protected HierarchicalDataProviderWrapper(HierarchicalDataProvider<T, F> dataProvider) {
59 super(dataProvider);
60 }
61
62 protected HierarchicalDataProvider<T, F> dataProvider() {
63 return (HierarchicalDataProvider<T, F>) dataProvider;
64 }
65
66 public void setPreFetchProcessor(Runnable preFetchProcessor) {
67 this.preFetchProcessor = preFetchProcessor;
68 }
69
70 @Override
71 public int getChildCount(HierarchicalQuery<T, F> query) {
72 return dataProvider().getChildCount(new HierarchicalQuery<>(
73 query.getOffset(),
74 query.getLimit(),
75 query.getSortOrders(),
76 query.getInMemorySorting(),
77 getFilter(query),
78 query.getParent()));
79 }
80
81 @Override
82 public Stream<T> fetchChildren(HierarchicalQuery<T, F> query) {
83 preFetchProcessor.run();
84 return dataProvider().fetchChildren(new HierarchicalQuery<>(
85 query.getOffset(),
86 query.getLimit(),
87 query.getSortOrders(),
88 query.getInMemorySorting(),
89 getFilter(query),
90 query.getParent()));
91 }
92
93 @Override
94 public boolean hasChildren(T item) {
95 return dataProvider().hasChildren(item);
96 }
97
98
99
100 @Override
101 public void destroy() {
102 if (dataProvider instanceof Destructible) {
103 ((Destructible) dataProvider).destroy();
104 }
105 }
106 }