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/*
* 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;
import java.util.HashMap;
/** @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;
}
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