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.chooser;
35
36 import info.magnolia.ui.ValueContext;
37 import info.magnolia.ui.api.ioc.UiContextScoped;
38 import info.magnolia.ui.filter.FilterContext;
39 import info.magnolia.ui.chooser.definition.SingleItemWorkbenchChooserDefinition;
40
41 import java.util.Collections;
42 import java.util.Iterator;
43 import java.util.function.Consumer;
44
45 import javax.inject.Inject;
46
47 import com.vaadin.ui.Component;
48
49 /**
50 * Workbench chooser ensuring only one items at a time can be selected.
51 *
52 * @param <T>
53 * type of items to be chosen
54 */
55 @UiContextScoped
56 public class SingleItemWorkbenchChooser<T> implements Chooser<T> {
57
58 private final WorkbenchChooser<T> workbenchChooser;
59
60 @Inject
61 public SingleItemWorkbenchChooser(SingleItemWorkbenchChooserDefinition<T> definition) {
62 bindContext(FilterContext.class);
63 bindContext(ValueContext.class);
64
65 workbenchChooser = create(definition.getWorkbenchChooser());
66 }
67
68 @Override
69 public Component asVaadinComponent() {
70 return workbenchChooser.asVaadinComponent();
71 }
72
73 @Override
74 public void onChange(Consumer<T> callback) {
75 workbenchChooser.onChange(items ->
76 callback.accept(items.iterator().hasNext() ? items.iterator().next() : null));
77 }
78
79 @Override
80 public T getChoice() {
81 final Iterator<T> iterator = workbenchChooser.getChoice().iterator();
82 return iterator.hasNext() ? iterator.next() : null;
83 }
84
85 @Override
86 public void setChoice(T choice) {
87 workbenchChooser.setChoice(choice == null ? Collections.emptySet() : Collections.singleton(choice));
88 }
89 }