Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 1 | /* |
Brian O'Connor | a09fe5b | 2017-08-03 21:12:30 -0700 | [diff] [blame] | 2 | * Copyright 2015-present Open Networking Foundation |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 15 | */ |
| 16 | |
Simon Hunt | 3ee7f74 | 2015-05-05 10:18:20 -0700 | [diff] [blame] | 17 | package org.onosproject.ui.table.cell; |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 18 | |
Simon Hunt | 3d1b065 | 2015-05-05 17:27:24 -0700 | [diff] [blame] | 19 | import org.onosproject.ui.table.CellComparator; |
| 20 | |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 21 | /** |
Simon Hunt | 27bf079 | 2015-05-07 10:50:29 -0700 | [diff] [blame] | 22 | * A default cell comparator. |
| 23 | * <p> |
| 24 | * Verifies that the objects being compared are the same class. |
| 25 | * Looks to see if the objects being compared implement comparable and, if so, |
| 26 | * delegates to that; otherwise, implements a lexicographical compare function |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 27 | * (i.e. string sorting). Uses the objects' toString() method and then |
| 28 | * compares the resulting strings. Note that null values are acceptable and |
| 29 | * are considered "smaller" than any non-null value. |
| 30 | */ |
Simon Hunt | 66f7543 | 2015-05-06 14:07:03 -0700 | [diff] [blame] | 31 | public final class DefaultCellComparator extends AbstractCellComparator { |
| 32 | |
| 33 | // non-instantiable |
| 34 | private DefaultCellComparator() { } |
Simon Hunt | 3d1b065 | 2015-05-05 17:27:24 -0700 | [diff] [blame] | 35 | |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 36 | @Override |
Simon Hunt | 27bf079 | 2015-05-07 10:50:29 -0700 | [diff] [blame] | 37 | @SuppressWarnings("unchecked") |
Simon Hunt | 3ee7f74 | 2015-05-05 10:18:20 -0700 | [diff] [blame] | 38 | protected int nonNullCompare(Object o1, Object o2) { |
Simon Hunt | 27bf079 | 2015-05-07 10:50:29 -0700 | [diff] [blame] | 39 | if (o1 instanceof Comparable) { |
| 40 | // if o2 is not the same class as o1, then compareTo will |
| 41 | // throw ClassCastException for us |
| 42 | return ((Comparable) o1).compareTo(o2); |
| 43 | } |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 44 | return o1.toString().compareTo(o2.toString()); |
| 45 | } |
Simon Hunt | 3d1b065 | 2015-05-05 17:27:24 -0700 | [diff] [blame] | 46 | |
| 47 | /** |
| 48 | * An instance of this class. |
| 49 | */ |
| 50 | public static final CellComparator INSTANCE = new DefaultCellComparator(); |
Simon Hunt | 933b1a8 | 2015-05-04 19:07:24 -0700 | [diff] [blame] | 51 | } |