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      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 package com.android.messaging.util;
     17 
     18 import java.util.Arrays;
     19 import java.util.Collection;
     20 import 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  */
     26 public 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