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1 /*
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2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.ui.table;
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26
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27 import java.util.*;
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28
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29 import javax.swing.table.TableModel;
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30 import javax.swing.event.TableModelEvent;
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31
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32 /**
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33 * A comparator which compares rows in a table model
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34 */
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35 public abstract class TableModelComparator implements Comparator {
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36
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37 private boolean ascending;
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38 protected TableModel model;
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39
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40 private int[] columns;
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41
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42 public TableModelComparator(TableModel model) {
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43 this.model = model;
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44
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45 // XXX - Should actually listen for column changes and resize
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46 columns = new int[model.getColumnCount()];
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47 columns[0] = -1;
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48 }
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49
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50 /**
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51 * Add the column to the sort criteria
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52 */
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53 public void addColumn(int column) {
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54 // Shift columns in the array
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55 int[] tempArray = new int[model.getColumnCount()];
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56 System.arraycopy(columns, 1, tempArray, 0, columns.length - 1);
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57
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58 columns = tempArray;
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59 columns[0] = column;
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60 }
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61
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62 /**
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63 * Get the last column that was sorted
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64 */
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65 public int getColumn() {
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66 return columns[0];
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67 }
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68
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69 public void setAscending(boolean ascending) {
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70 this.ascending = ascending;
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71 }
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72
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73 public boolean isAscending() {
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74 return ascending;
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75 }
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76
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77 /**
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78 * Implementation of the comparator method. A comparison is
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79 * made for rows.
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80 */
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81 public int compare(Object row1, Object row2) {
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82 for (int i = 0; i < columns.length; i++) {
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83
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84 Object o1 = getValueForColumn(row1, columns[i]);
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85 Object o2 = getValueForColumn(row2, columns[i]);
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86
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87 // If both values are null, return 0.
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88 if (o1 == null && o2 == null) {
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89 return 0;
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90 } else if (o1 == null) { // Define null less than everything.
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91 return -1;
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92 } else if (o2 == null) {
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93 return 1;
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94 }
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95
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96 int result = 0;
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97
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98 if (o1 instanceof Comparable) {
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99 Comparable c1 = (Comparable)o1;
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100 Comparable c2 = (Comparable)o2;
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101
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102 result = c1.compareTo(c2);
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103 }
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104
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105 // XXX Should have some sort of provision for determininte
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106 // if there is another way of comparing the objects.
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107 // Perhaps we should add the requirement that all table
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108 // values be Compabable.
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109
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110 if (result != 0) {
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111 return ascending ? result : -result;
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112 }
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113 }
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114 return 0;
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115 }
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116
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117 /**
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118 * Returns the value for the comparing object for the
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119 * column.
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120 *
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121 * @param obj Row object that was passed into Comparator.
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122 * @param column the column to retrieve
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123 */
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124 public abstract Object getValueForColumn(Object obj, int column);
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125
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126 }
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