1/*
2 * Copyright (C) 2015 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 */
16
17package com.android.messaging.util;
18
19import android.support.v4.util.LongSparseArray;
20
21/**
22 * A space saving set for long values using v4 compat LongSparseArray
23 */
24public class LongSparseSet {
25    private static final Object THE_ONLY_VALID_VALUE = new Object();
26    private final LongSparseArray<Object> mSet = new LongSparseArray<Object>();
27
28    public LongSparseSet() {
29    }
30
31    /**
32     * @param key The element to check
33     * @return True if the element is in the set, false otherwise
34     */
35    public boolean contains(long key) {
36        if (mSet.get(key, null/*default*/) == THE_ONLY_VALID_VALUE) {
37            return true;
38        }
39        return false;
40    }
41
42    /**
43     * Add an element to the set
44     *
45     * @param key The element to add
46     */
47    public void add(long key) {
48        mSet.put(key, THE_ONLY_VALID_VALUE);
49    }
50
51    /**
52     * Remove an element from the set
53     *
54     * @param key The element to remove
55     */
56    public void remove(long key) {
57        mSet.delete(key);
58    }
59}
60