| /* |
| * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.ui.table; |
| |
| import java.util.*; |
| |
| import javax.swing.table.TableModel; |
| import javax.swing.event.TableModelEvent; |
| |
| /** |
| * A comparator which compares rows in a table model |
| */ |
| public abstract class TableModelComparator implements Comparator { |
| |
| private boolean ascending; |
| protected TableModel model; |
| |
| private int[] columns; |
| |
| public TableModelComparator(TableModel model) { |
| this.model = model; |
| |
| // XXX - Should actually listen for column changes and resize |
| columns = new int[model.getColumnCount()]; |
| columns[0] = -1; |
| } |
| |
| /** |
| * Add the column to the sort criteria |
| */ |
| public void addColumn(int column) { |
| // Shift columns in the array |
| int[] tempArray = new int[model.getColumnCount()]; |
| System.arraycopy(columns, 1, tempArray, 0, columns.length - 1); |
| |
| columns = tempArray; |
| columns[0] = column; |
| } |
| |
| /** |
| * Get the last column that was sorted |
| */ |
| public int getColumn() { |
| return columns[0]; |
| } |
| |
| public void setAscending(boolean ascending) { |
| this.ascending = ascending; |
| } |
| |
| public boolean isAscending() { |
| return ascending; |
| } |
| |
| /** |
| * Implementation of the comparator method. A comparison is |
| * made for rows. |
| */ |
| public int compare(Object row1, Object row2) { |
| for (int i = 0; i < columns.length; i++) { |
| |
| Object o1 = getValueForColumn(row1, columns[i]); |
| Object o2 = getValueForColumn(row2, columns[i]); |
| |
| // If both values are null, return 0. |
| if (o1 == null && o2 == null) { |
| return 0; |
| } else if (o1 == null) { // Define null less than everything. |
| return -1; |
| } else if (o2 == null) { |
| return 1; |
| } |
| |
| int result = 0; |
| |
| if (o1 instanceof Comparable) { |
| Comparable c1 = (Comparable)o1; |
| Comparable c2 = (Comparable)o2; |
| |
| result = c1.compareTo(c2); |
| } |
| |
| // XXX Should have some sort of provision for determininte |
| // if there is another way of comparing the objects. |
| // Perhaps we should add the requirement that all table |
| // values be Compabable. |
| |
| if (result != 0) { |
| return ascending ? result : -result; |
| } |
| } |
| return 0; |
| } |
| |
| /** |
| * Returns the value for the comparing object for the |
| * column. |
| * |
| * @param obj Row object that was passed into Comparator. |
| * @param column the column to retrieve |
| */ |
| public abstract Object getValueForColumn(Object obj, int column); |
| |
| } |