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 ConversationIdSet()30 public ConversationIdSet() { 31 super(); 32 } 33 ConversationIdSet(final Collection<String> asList)34 public ConversationIdSet(final Collection<String> asList) { 35 super(asList); 36 } 37 first()38 public String first() { 39 if (size() > 0) { 40 return iterator().next(); 41 } else { 42 return null; 43 } 44 } 45 createSet(final String conversationIdSetString)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 getDelimitedString()55 public String getDelimitedString() { 56 return OsUtil.joinFromSetWithDelimiter(this, JOIN_DELIMITER); 57 } 58 join(final String conversationIdSet1, final String conversationIdSet2)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