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comparison agent/src/share/classes/sun/jvm/hotspot/ui/table/TableModelComparator.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2002 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.ui.table;
26
27 import java.util.*;
28
29 import javax.swing.table.TableModel;
30 import javax.swing.event.TableModelEvent;
31
32 /**
33 * A comparator which compares rows in a table model
34 */
35 public abstract class TableModelComparator implements Comparator {
36
37 private boolean ascending;
38 protected TableModel model;
39
40 private int[] columns;
41
42 public TableModelComparator(TableModel model) {
43 this.model = model;
44
45 // XXX - Should actually listen for column changes and resize
46 columns = new int[model.getColumnCount()];
47 columns[0] = -1;
48 }
49
50 /**
51 * Add the column to the sort criteria
52 */
53 public void addColumn(int column) {
54 // Shift columns in the array
55 int[] tempArray = new int[model.getColumnCount()];
56 System.arraycopy(columns, 1, tempArray, 0, columns.length - 1);
57
58 columns = tempArray;
59 columns[0] = column;
60 }
61
62 /**
63 * Get the last column that was sorted
64 */
65 public int getColumn() {
66 return columns[0];
67 }
68
69 public void setAscending(boolean ascending) {
70 this.ascending = ascending;
71 }
72
73 public boolean isAscending() {
74 return ascending;
75 }
76
77 /**
78 * Implementation of the comparator method. A comparison is
79 * made for rows.
80 */
81 public int compare(Object row1, Object row2) {
82 for (int i = 0; i < columns.length; i++) {
83
84 Object o1 = getValueForColumn(row1, columns[i]);
85 Object o2 = getValueForColumn(row2, columns[i]);
86
87 // If both values are null, return 0.
88 if (o1 == null && o2 == null) {
89 return 0;
90 } else if (o1 == null) { // Define null less than everything.
91 return -1;
92 } else if (o2 == null) {
93 return 1;
94 }
95
96 int result = 0;
97
98 if (o1 instanceof Comparable) {
99 Comparable c1 = (Comparable)o1;
100 Comparable c2 = (Comparable)o2;
101
102 result = c1.compareTo(c2);
103 }
104
105 // XXX Should have some sort of provision for determininte
106 // if there is another way of comparing the objects.
107 // Perhaps we should add the requirement that all table
108 // values be Compabable.
109
110 if (result != 0) {
111 return ascending ? result : -result;
112 }
113 }
114 return 0;
115 }
116
117 /**
118 * Returns the value for the comparing object for the
119 * column.
120 *
121 * @param obj Row object that was passed into Comparator.
122 * @param column the column to retrieve
123 */
124 public abstract Object getValueForColumn(Object obj, int column);
125
126 }