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 }