View Javadoc

1   /**
2    * This file Copyright (c) 2013 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.module.googlesitemap.app.subapp.sitemapdetail.util;
35  
36  import info.magnolia.module.googlesitemap.bean.SiteMapEntry;
37  
38  import java.util.ArrayList;
39  import java.util.Collection;
40  import java.util.List;
41  
42  import com.vaadin.data.Container;
43  import com.vaadin.data.util.BeanItemContainer;
44  
45  /**
46   * Container capable of keeping objects of type {@link SiteMapEntry} and resolving their hierarchy.
47   */
48  public class SiteMapEntryContainer extends BeanItemContainer<SiteMapEntry> implements Container.Hierarchical {
49  
50      private int maxLevel = Integer.MIN_VALUE;
51  
52      private int minLevel = Integer.MAX_VALUE;
53  
54      public SiteMapEntryContainer(List<SiteMapEntry> entries) {
55          super(SiteMapEntry.class);
56          addAll(entries);
57          calculateBoundLevels();
58      }
59  
60      @Override
61      public Collection<?> getChildren(Object itemId) {
62          SiteMapEntry entry = (SiteMapEntry)itemId;
63  
64          int level = entry.getLevel();
65          List<SiteMapEntry> children = new ArrayList<SiteMapEntry>();
66          int index = indexOfId(entry) + 1;
67          while (index < size()) {
68              SiteMapEntry childEntry = getIdByIndex(index);
69              if (childEntry.getLevel() != level + 1) {
70                  break;
71              }
72              children.add(childEntry);
73              ++index;
74          }
75          return children;
76      }
77  
78      @Override
79      public Object getParent(Object itemId) {
80          SiteMapEntry parent = null;
81          SiteMapEntry child = (SiteMapEntry)itemId;
82          int index = indexOfId(itemId);
83          while (index > 0 && parent == null) {
84              SiteMapEntry id = getIdByIndex(--index);
85              if (id.getLevel() < child.getLevel()) {
86                  parent = id;
87              }
88          }
89          return parent;
90      }
91  
92      @Override
93      public Collection<?> rootItemIds() {
94          List<SiteMapEntry> roots = new ArrayList<SiteMapEntry>();
95          for (SiteMapEntry entry : getItemIds()) {
96              if (entry.getLevel() == minLevel) {
97                  roots.add(entry);
98              }
99          }
100         return roots;
101     }
102 
103     @Override
104     public boolean areChildrenAllowed(Object itemId) {
105         return getChildren(itemId).size() > 0;
106     }
107 
108     @Override
109     public boolean isRoot(Object itemId) {
110         return ((SiteMapEntry)itemId).getLevel() == minLevel;
111     }
112 
113     @Override
114     public boolean hasChildren(Object itemId) {
115         return ((SiteMapEntry)itemId).getLevel() < maxLevel;
116     }
117 
118     @Override
119     public boolean setParent(Object itemId, Object newParentId) throws UnsupportedOperationException {
120         throw new UnsupportedOperationException();
121     }
122 
123     @Override
124     public boolean setChildrenAllowed(Object itemId, boolean areChildrenAllowed) throws UnsupportedOperationException {
125         throw new UnsupportedOperationException();
126     }
127 
128     private void calculateBoundLevels() {
129         Collection<SiteMapEntry> ids = getItemIds();
130         for (SiteMapEntry id : ids) {
131             int level = id.getLevel();
132             maxLevel = Math.max(maxLevel, level);
133             minLevel = Math.min(minLevel, level);
134         }
135     }
136 }