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.config.source.yaml;
35
36 import info.magnolia.config.source.yaml.construct.WrapMetadata.Metadata;
37
38 import java.util.HashMap;
39 import java.util.Map;
40 import java.util.Map.Entry;
41 import java.util.function.Consumer;
42 import java.util.function.Predicate;
43
44 /**
45 * Provides functionality to process parsed YAML files.
46 */
47 class MetadataProcessor {
48
49 private final Consumer<Metadata> metadataConsumer;
50
51 MetadataProcessor(Consumer<Metadata> metadataConsumer) {
52 this.metadataConsumer = metadataConsumer;
53 }
54
55 /**
56 * Processing the given {@code #map} by finding {@link Metadata} entries and simply delegating them to {@link #metadataConsumer}.
57 * Afterward, it subtract {@link Metadata} from given {@code #map} and returns that filtered map.
58 */
59 Map<String, Object> process(Map<String, Object> map) {
60 metadataConsumer.accept(Metadata.of(filterMap(map, isMetadataEntry())));
61
62 return filterMap(map, isMetadataEntry().negate());
63 }
64
65 private static Predicate<Entry> isMetadataEntry() {
66 return entry -> entry.getValue() instanceof Metadata;
67 }
68
69 private Map<String, Object> filterMap(Map<String, Object> source, Predicate<Map.Entry> filter) {
70 return source.entrySet().stream()
71 .filter(filter)
72 .collect(HashMap::new, (map, entry) -> map.put(entry.getKey(), entry.getValue()), Map::putAll);
73 }
74 }