| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.os; |
| |
| import android.os.Handler; |
| import android.os.Message; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** @hide */ |
| public class Registrant |
| { |
| public |
| Registrant(Handler h, int what, Object obj) |
| { |
| refH = new WeakReference(h); |
| this.what = what; |
| userObj = obj; |
| } |
| |
| public void |
| clear() |
| { |
| refH = null; |
| userObj = null; |
| } |
| |
| public void |
| notifyRegistrant() |
| { |
| internalNotifyRegistrant (null, null); |
| } |
| |
| public void |
| notifyResult(Object result) |
| { |
| internalNotifyRegistrant (result, null); |
| } |
| |
| public void |
| notifyException(Throwable exception) |
| { |
| internalNotifyRegistrant (null, exception); |
| } |
| |
| /** |
| * This makes a copy of @param ar |
| */ |
| public void |
| notifyRegistrant(AsyncResult ar) |
| { |
| internalNotifyRegistrant (ar.result, ar.exception); |
| } |
| |
| /*package*/ void |
| internalNotifyRegistrant (Object result, Throwable exception) |
| { |
| Handler h = getHandler(); |
| |
| if (h == null) { |
| clear(); |
| } else { |
| Message msg = Message.obtain(); |
| |
| msg.what = what; |
| |
| msg.obj = new AsyncResult(userObj, result, exception); |
| |
| h.sendMessage(msg); |
| } |
| } |
| |
| /** |
| * NOTE: May return null if weak reference has been collected |
| */ |
| |
| public Message |
| messageForRegistrant() |
| { |
| Handler h = getHandler(); |
| |
| if (h == null) { |
| clear(); |
| |
| return null; |
| } else { |
| Message msg = h.obtainMessage(); |
| |
| msg.what = what; |
| msg.obj = userObj; |
| |
| return msg; |
| } |
| } |
| |
| public Handler |
| getHandler() |
| { |
| if (refH == null) |
| return null; |
| |
| return (Handler) refH.get(); |
| } |
| |
| WeakReference refH; |
| int what; |
| Object userObj; |
| } |
| |