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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.datasource.enumeration;
35  
36  import info.magnolia.i18nsystem.SimpleTranslator;
37  import info.magnolia.ui.field.SelectFieldSupport;
38  
39  import javax.inject.Inject;
40  
41  import com.vaadin.data.Converter;
42  import com.vaadin.data.provider.DataProvider;
43  import com.vaadin.ui.IconGenerator;
44  import com.vaadin.ui.ItemCaptionGenerator;
45  
46  /**
47   * Support for select fields backed by enumeration types.
48   *
49   * @param <T>
50   *     enum type
51   */
52  public class EnumSelectFieldSupport<T extends Enum<T>> implements SelectFieldSupport<T> {
53  
54      private final EnumDatasourceDefinition datasourceDefinition;
55      private final SimpleTranslator i18n;
56  
57      @Inject
58      protected EnumSelectFieldSupport(EnumDatasourceDefinition datasourceDefinition, SimpleTranslator i18n) {
59          this.datasourceDefinition = datasourceDefinition;
60          this.i18n = i18n;
61      }
62  
63      @Override
64      public DataProvider<T, ?> getDataProvider() {
65          return new EnumDataProvider(datasourceDefinition);
66      }
67  
68      @Override
69      public ItemCaptionGenerator<T> getItemCaptionGenerator() {
70          return this::translateFromFQN;
71      }
72  
73      private String translateFromFQN(T t) {
74          final String i18nKey = String.format("%s.%s", t.getClass().getName(), t.name())
75                  .replace("$", ".")
76                  .toLowerCase();
77          final String translatedText = i18n.translate(i18nKey);
78          return i18nKey.equals(translatedText) ? t.name() : translatedText;
79      }
80  
81      @Override
82      public IconGenerator<T> getIconGenerator() {
83          return enumEntry -> null;
84      }
85  
86      @Override
87      public Converter<T, String> defaultConverter() {
88          throw new UnsupportedOperationException("Linking to enums is not supported");
89      }
90  }