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.availability;
35
36 import info.magnolia.objectfactory.ComponentProvider;
37 import info.magnolia.ui.api.availability.AvailabilityDefinition;
38 import info.magnolia.ui.api.availability.AvailabilityRuleDefinition;
39 import info.magnolia.ui.availability.rule.AccessGrantedRuleDefinition;
40 import info.magnolia.ui.availability.rule.MultipleItemsRuleDefinition;
41
42 import java.util.List;
43 import java.util.stream.Stream;
44
45 import javax.inject.Inject;
46
47 /**
48 * Implements {@link info.magnolia.ui.api.availability.AvailabilityChecker}.
49 */
50 public class DefaultAvailabilityChecker<T> implements AvailabilityChecker<T> {
51
52 private final ComponentProvider componentProvider;
53
54 @Inject
55 public DefaultAvailabilityChecker(ComponentProvider componentProvider) {
56 this.componentProvider = componentProvider;
57 }
58
59 @Override
60 public boolean isAvailable(AvailabilityDefinition availabilityDefinition, List<T> items) {
61 // verify that all the rules pass
62 boolean rulesPass = Stream.concat(getDefaultRulesDefinitions(), availabilityDefinition.getRules().stream())
63 .filter(ruleDefinition -> ruleDefinition.getImplementationClass() != null)
64 .allMatch(ruleDefinition -> isAvailable(availabilityDefinition, ruleDefinition, items));
65
66 // if the item set it empty and the rules are 'ok with that'
67 // check whether availability is generally configured to work with root
68 if (rulesPass && items.isEmpty()) {
69 return availabilityDefinition.isRoot();
70 }
71
72 return rulesPass;
73 }
74
75 protected Stream<AvailabilityRuleDefinition> getDefaultRulesDefinitions() {
76 return Stream.of(new AccessGrantedRuleDefinition(), new MultipleItemsRuleDefinition());
77 }
78
79 private boolean isAvailable(AvailabilityDefinition availabilityDefinition, AvailabilityRuleDefinition ruleDefinition, List<T> items) {
80 return componentProvider.newInstance(ruleDefinition.getImplementationClass(), availabilityDefinition, ruleDefinition).isAvailable(items);
81 }
82 }