The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 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 | |
| 17 | package android.os; |
| 18 | |
| 19 | import android.os.Handler; |
| 20 | import android.os.Message; |
| 21 | |
| 22 | import java.util.ArrayList; |
| 23 | import java.util.HashMap; |
| 24 | |
| 25 | /** @hide */ |
| 26 | public class RegistrantList |
| 27 | { |
| 28 | ArrayList registrants = new ArrayList(); // of Registrant |
| 29 | |
| 30 | public synchronized void |
| 31 | add(Handler h, int what, Object obj) |
| 32 | { |
| 33 | add(new Registrant(h, what, obj)); |
| 34 | } |
| 35 | |
| 36 | public synchronized void |
| 37 | addUnique(Handler h, int what, Object obj) |
| 38 | { |
| 39 | // if the handler is already in the registrant list, remove it |
| 40 | remove(h); |
| 41 | add(new Registrant(h, what, obj)); |
| 42 | } |
| 43 | |
| 44 | public synchronized void |
| 45 | add(Registrant r) |
| 46 | { |
| 47 | removeCleared(); |
| 48 | registrants.add(r); |
| 49 | } |
| 50 | |
| 51 | public synchronized void |
| 52 | removeCleared() |
| 53 | { |
| 54 | for (int i = registrants.size() - 1; i >= 0 ; i--) { |
| 55 | Registrant r = (Registrant) registrants.get(i); |
| 56 | |
| 57 | if (r.refH == null) { |
| 58 | registrants.remove(i); |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | public synchronized int |
| 64 | size() |
| 65 | { |
| 66 | return registrants.size(); |
| 67 | } |
| 68 | |
| 69 | public synchronized Object |
| 70 | get(int index) |
| 71 | { |
| 72 | return registrants.get(index); |
| 73 | } |
| 74 | |
| 75 | private synchronized void |
| 76 | internalNotifyRegistrants (Object result, Throwable exception) |
| 77 | { |
| 78 | for (int i = 0, s = registrants.size(); i < s ; i++) { |
| 79 | Registrant r = (Registrant) registrants.get(i); |
| 80 | r.internalNotifyRegistrant(result, exception); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | public /*synchronized*/ void |
| 85 | notifyRegistrants() |
| 86 | { |
| 87 | internalNotifyRegistrants(null, null); |
| 88 | } |
| 89 | |
| 90 | public /*synchronized*/ void |
| 91 | notifyException(Throwable exception) |
| 92 | { |
| 93 | internalNotifyRegistrants (null, exception); |
| 94 | } |
| 95 | |
| 96 | public /*synchronized*/ void |
| 97 | notifyResult(Object result) |
| 98 | { |
| 99 | internalNotifyRegistrants (result, null); |
| 100 | } |
| 101 | |
| 102 | |
| 103 | public /*synchronized*/ void |
| 104 | notifyRegistrants(AsyncResult ar) |
| 105 | { |
| 106 | internalNotifyRegistrants(ar.result, ar.exception); |
| 107 | } |
| 108 | |
| 109 | public synchronized void |
| 110 | remove(Handler h) |
| 111 | { |
| 112 | for (int i = 0, s = registrants.size() ; i < s ; i++) { |
| 113 | Registrant r = (Registrant) registrants.get(i); |
| 114 | Handler rh; |
| 115 | |
| 116 | rh = r.getHandler(); |
| 117 | |
| 118 | /* Clean up both the requested registrant and |
| 119 | * any now-collected registrants |
| 120 | */ |
| 121 | if (rh == null || rh == h) { |
| 122 | r.clear(); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | removeCleared(); |
| 127 | } |
| 128 | } |