1 | /**
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2 | *#########################################################################
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3 | *
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4 | * A component of the Gatherer application, part of the Greenstone digital
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5 | * library suite from the New Zealand Digital Library Project at the
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6 | * University of Waikato, New Zealand.
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7 | *
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8 | * <BR><BR>
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9 | *
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10 | * Author: John Thompson, Greenstone Digital Library, University of Waikato
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11 | *
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12 | * <BR><BR>
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13 | *
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14 | * Copyright (C) 1999 New Zealand Digital Library Project
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15 | *
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16 | * <BR><BR>
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17 | *
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18 | * This program is free software; you can redistribute it and/or modify
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19 | * it under the terms of the GNU General Public License as published by
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20 | * the Free Software Foundation; either version 2 of the License, or
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21 | * (at your option) any later version.
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22 | *
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23 | * <BR><BR>
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24 | *
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25 | * This program is distributed in the hope that it will be useful,
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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28 | * GNU General Public License for more details.
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29 | *
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30 | * <BR><BR>
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31 | *
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32 | * You should have received a copy of the GNU General Public License
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33 | * along with this program; if not, write to the Free Software
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34 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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35 | *########################################################################
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36 | */
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37 | package org.greenstone.gatherer.cdm;
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38 |
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39 | /**************************************************************************************
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40 | * Title: Gatherer
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41 | * Description: The Gatherer: a tool for gathering and enriching a digital collection.
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42 | * Company: The University of Waikato
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43 | * Written: 20/05/02
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44 | * Revised: 03/10/02 - Commented
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45 | **************************************************************************************/
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46 | import javax.swing.ComboBoxModel;
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47 | import javax.swing.DefaultListModel;
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48 |
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49 | /** This class extends the functionality of the DefaultListModel to include simple methods for refreshing the contents of this model if one of its elements changes.
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50 | * @author John Thompson, Greenstone Digital Library, University of Waikato
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51 | * @version 2.3
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52 | */
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53 | public class DynamicListModel
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54 | extends DefaultListModel
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55 | implements ComboBoxModel {
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56 |
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57 | private boolean auto_order = false;
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58 |
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59 | private Object object = null;
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60 |
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61 | public void addElement(Object element) {
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62 | if(auto_order) {
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63 | // Insert the object in its alphabetically correct place.
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64 | int position = 0;
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65 | boolean found = false;
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66 | while(!found && position < size()) {
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67 | ///ystem.err.print("Compare " + element.toString() + " to " + get(position).toString() + ": ");
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68 | int order = element.toString().compareTo(get(position).toString());
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69 | if(order < 0) {
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70 | add(position, element);
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71 | found = true;
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72 | ///ystem.err.println("Greater than. Insert");
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73 | }
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74 | else if(order == 0) {
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75 | found = true;
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76 | ///ystem.err.println("Equal. End.");
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77 | }
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78 | else {
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79 | position++;
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80 | ///ystem.err.println("Less than. Carry on.");
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81 | }
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82 | }
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83 | if(!found) {
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84 | super.addElement(element);
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85 | ///ystem.err.println("Out of elements. Insert");
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86 | }
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87 | }
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88 | else {
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89 | super.addElement(element);
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90 | }
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91 | }
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92 |
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93 | /* private DynamicListModel shallowCopy() {
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94 | DynamicListModel copy = new DynamicListModel();
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95 | copy.setAutoOrder(auto_order);
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96 | for(int i = 0; i < size(); i++) {
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97 | copy.addElement(get(i));
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98 | }
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99 | return copy;
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100 | } */
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101 |
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102 | public Object getSelectedItem() {
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103 | ///ystem.err.println("Get item: " + object);
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104 | return object;
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105 | }
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106 | /** Notify all controls that are based on this list model that its contents have changed, and they should repaint themselves. */
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107 | public void refresh() {
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108 | fireContentsChanged(this, 0, size());
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109 | }
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110 |
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111 | public void setAutoOrder(boolean auto_order) {
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112 | this.auto_order = auto_order;
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113 | }
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114 |
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115 | public void setSelectedItem(Object object) {
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116 | ///ystem.err.println("Set item: " + object);
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117 | this.object = object;
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118 | }
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119 | }
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