1 /*
2 * $Source$
3 * $Revision$
4 *
5 * Copyright (C) 2007 Tim Pizey
6 *
7 * Part of Melati (http://melati.org), a framework for the rapid
8 * development of clean, maintainable web applications.
9 *
10 * Melati is free software; Permission is granted to copy, distribute
11 * and/or modify this software under the terms either:
12 *
13 * a) the GNU General Public License as published by the Free Software
14 * Foundation; either version 2 of the License, or (at your option)
15 * any later version,
16 *
17 * or
18 *
19 * b) any version of the Melati Software License, as published
20 * at http://melati.org
21 *
22 * You should have received a copy of the GNU General Public License and
23 * the Melati Software License along with this program;
24 * if not, write to the Free Software Foundation, Inc.,
25 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
26 * GNU General Public License and visit http://melati.org to obtain the
27 * Melati Software License.
28 *
29 * Feel free to contact the Developers of Melati (http://melati.org),
30 * if you would like to work out a different arrangement than the options
31 * outlined here. It is our intention to allow Melati to be used by as
32 * wide an audience as possible.
33 *
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
38 *
39 * Contact details for copyright holder:
40 *
41 * Tim Pizey <timp At paneris.org>
42 * http://paneris.org/~timp
43 */
44 package org.melati.poem;
45
46 import java.util.Comparator;
47 import java.util.Enumeration;
48 import java.util.NoSuchElementException;
49 import java.util.SortedMap;
50
51 /**
52 * @author timp
53 * @since 8 Jun 2007
54 *
55 */
56 public class TableSortedMap<P extends Persistent> extends TableMap<P>
57 implements SortedMap<Integer, P> {
58
59 /**
60 * Constructor for setter injection.
61 */
62 public TableSortedMap() {
63 }
64
65 /**
66 * Constructor for constructor injection.
67 * @param t
68 */
69 public TableSortedMap(Table<P> t) {
70 super(t);
71 }
72
73 /**
74 * We use native ordering.
75 */
76 @Override
77 public Comparator<Integer> comparator() {
78 return null;
79 }
80
81 @Override
82 public Integer firstKey() {
83 if(table.cachedCount((String)null).count() == 0)
84 throw new NoSuchElementException();
85 try {
86 table.getObject(0);
87 return new Integer(0);
88 } catch (NoSuchRowPoemException e) {
89 Persistent p = table.firstSelection(null);
90 return p.troid();
91 }
92 }
93
94 /**
95 * {@inheritDoc}
96 *
97 * NOTE first attempt using table.getMostRecentTroid() does not take
98 * account of deletion as mostRecentTroid is never decremented
99 * @see java.util.SortedMap#lastKey()
100 */
101 @Override
102 public Integer lastKey() {
103 if(table.cachedCount((String)null).count() == 0)
104 throw new NoSuchElementException();
105 Enumeration<P> them = table.selection(null, table.getDatabase().getDbms().getQuotedName("id") + " DESC", false);
106 return them.nextElement().troid();
107 }
108
109 @Override
110 public SortedMap<Integer, P> subMap(Integer fromKey, Integer toKey) {
111 throw new UnsupportedOperationException();
112 }
113
114 @Override
115 public SortedMap<Integer, P> headMap(Integer toKey) {
116 throw new UnsupportedOperationException();
117 }
118
119 @Override
120 public SortedMap<Integer, P> tailMap(Integer arg0) {
121 throw new UnsupportedOperationException();
122 }
123
124 }