| /* |
| * Copyright 2015 Open Networking Laboratory |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package org.onosproject.ui.table.cell; |
| |
| import org.onosproject.ui.table.CellComparator; |
| |
| /** |
| * A default cell comparator. |
| * <p> |
| * Verifies that the objects being compared are the same class. |
| * Looks to see if the objects being compared implement comparable and, if so, |
| * delegates to that; otherwise, implements a lexicographical compare function |
| * (i.e. string sorting). Uses the objects' toString() method and then |
| * compares the resulting strings. Note that null values are acceptable and |
| * are considered "smaller" than any non-null value. |
| */ |
| public final class DefaultCellComparator extends AbstractCellComparator { |
| |
| // non-instantiable |
| private DefaultCellComparator() { } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| protected int nonNullCompare(Object o1, Object o2) { |
| if (o1 instanceof Comparable) { |
| // if o2 is not the same class as o1, then compareTo will |
| // throw ClassCastException for us |
| return ((Comparable) o1).compareTo(o2); |
| } |
| return o1.toString().compareTo(o2.toString()); |
| } |
| |
| /** |
| * An instance of this class. |
| */ |
| public static final CellComparator INSTANCE = new DefaultCellComparator(); |
| } |