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