1/*
2 * Copyright (C) 2014 The Android Open Source Project
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.
15 */
16package com.android.server.notification;
17
18import java.util.Comparator;
19
20/**
21 * Sorts notifications by their global sort key.
22 */
23public class GlobalSortKeyComparator implements Comparator<NotificationRecord> {
24    @Override
25    public int compare(NotificationRecord left, NotificationRecord right) {
26        if (left.getGlobalSortKey() == null) {
27            throw new IllegalStateException("Missing left global sort key: " + left);
28        }
29        if (right.getGlobalSortKey() == null) {
30            throw new IllegalStateException("Missing right global sort key: " + right);
31        }
32        return left.getGlobalSortKey().compareTo(right.getGlobalSortKey());
33    }
34}
35