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 */
16package com.android.messaging.util;
17
18import java.util.Arrays;
19import java.util.Collection;
20import java.util.HashSet;
21
22/**
23 * Utility class to make it easy to store multiple conversation id strings in a single string
24 * with delimeters.
25 */
26public class ConversationIdSet extends HashSet<String> {
27    private static final String JOIN_DELIMITER = "|";
28    private static final String SPLIT_DELIMITER = "\\|";
29
30    public ConversationIdSet() {
31        super();
32    }
33
34    public ConversationIdSet(final Collection<String> asList) {
35        super(asList);
36    }
37
38    public String first() {
39        if (size() > 0) {
40            return iterator().next();
41        } else {
42            return null;
43        }
44    }
45
46    public static ConversationIdSet createSet(final String conversationIdSetString) {
47        ConversationIdSet set = null;
48        if (conversationIdSetString != null) {
49            set = new ConversationIdSet(Arrays.asList(conversationIdSetString.split(
50                    SPLIT_DELIMITER)));
51        }
52        return set;
53    }
54
55    public String getDelimitedString() {
56        return OsUtil.joinFromSetWithDelimiter(this, JOIN_DELIMITER);
57    }
58
59    public static String join(final String conversationIdSet1, final String conversationIdSet2) {
60        String joined = null;
61        if (conversationIdSet1 == null) {
62            joined = conversationIdSet2;
63        } else if (conversationIdSet2 != null) {
64            joined = conversationIdSet1 + JOIN_DELIMITER + conversationIdSet2;
65        }
66        return joined;
67    }
68
69}
70