1 /**
2 * This file Copyright (c) 2020 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.pages.app;
35
36 import info.magnolia.ui.contentapp.browser.drop.DropConstraint;
37
38 import javax.jcr.Item;
39 import javax.jcr.RepositoryException;
40
41 import org.slf4j.Logger;
42 import org.slf4j.LoggerFactory;
43
44 import com.vaadin.shared.ui.grid.DropLocation;
45
46 /**
47 * This {@link DropConstraint} delegates back to a {@link PageContentClipboard} to
48 * decide whether a node can be moved to its intended target.
49 */
50 class PageContentClipboardConstraint implements DropConstraint<Item> {
51 private static final Logger LOG = LoggerFactory.getLogger(PageContentClipboardConstraint.class);
52
53 private static final int WORKSPACE_DEPTH = 1;
54
55 private final PageContentClipboard pageContentClipboard;
56
57 PageContentClipboardConstraint(PageContentClipboard pageContentClipboard) {
58 this.pageContentClipboard = pageContentClipboard;
59 }
60
61 @Override
62 public boolean isAllowedAt(Item source, Item target, DropLocation dropLocation) {
63 try {
64 switch (dropLocation) {
65 case ON_TOP:
66 return pageContentClipboard.canPasteInto(source, target);
67 case BELOW:
68 case ABOVE:
69 return (source.getDepth() == WORKSPACE_DEPTH && target.getDepth() == WORKSPACE_DEPTH)
70 || pageContentClipboard.canPasteInto(source, target.getParent());
71 }
72 } catch (RepositoryException e) {
73 LOG.error("Failed to evaluate drop constrain", e);
74 }
75 return false;
76 }
77 }