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.templating.elements.attribute;
35
36 import info.magnolia.templating.elements.TemplatingElement;
37
38 import java.util.ArrayList;
39 import java.util.List;
40 import java.util.Objects;
41 import java.util.Optional;
42 import java.util.stream.Collectors;
43
44 /**
45 * {@link ElementAttribute} which joins output of multiple {@link info.magnolia.templating.elements.attribute.ElementAttribute}s into one attribute.
46 */
47 public class Joining implements ElementAttribute<TemplatingElement> {
48
49 private List<ElementAttribute> attributes = new ArrayList<>();
50
51 @Override
52 public Optional<String> getValue(TemplatingElement element) {
53 String joined = attributes == null || attributes.isEmpty() ? null : attributes.stream()
54 .map(attribute -> (String) attribute.getValue(element).orElse(null))
55 .filter(Objects::nonNull)
56 .collect(Collectors.joining(","));
57 return Optional.ofNullable(joined);
58 }
59
60 public List<ElementAttribute> getAttributes() {
61 return attributes;
62 }
63
64 public void setAttributes(List<ElementAttribute> attributes) {
65 this.attributes = attributes;
66 }
67 }