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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.util.ArrayList;
import java.util.HashMap;
/** @hide */
public class RegistrantList
{
ArrayList registrants = new ArrayList(); // of Registrant
public synchronized void
add(Handler h, int what, Object obj)
{
add(new Registrant(h, what, obj));
}
public synchronized void
addUnique(Handler h, int what, Object obj)
{
// if the handler is already in the registrant list, remove it
remove(h);
add(new Registrant(h, what, obj));
}
public synchronized void
add(Registrant r)
{
removeCleared();
registrants.add(r);
}
public synchronized void
removeCleared()
{
for (int i = registrants.size() - 1; i >= 0 ; i--) {
Registrant r = (Registrant) registrants.get(i);
if (r.refH == null) {
registrants.remove(i);
}
}
}
public synchronized int
size()
{
return registrants.size();
}
public synchronized Object
get(int index)
{
return registrants.get(index);
}
private synchronized void
internalNotifyRegistrants (Object result, Throwable exception)
{
for (int i = 0, s = registrants.size(); i < s ; i++) {
Registrant r = (Registrant) registrants.get(i);
r.internalNotifyRegistrant(result, exception);
}
}
public /*synchronized*/ void
notifyRegistrants()
{
internalNotifyRegistrants(null, null);
}
public /*synchronized*/ void
notifyException(Throwable exception)
{
internalNotifyRegistrants (null, exception);
}
public /*synchronized*/ void
notifyResult(Object result)
{
internalNotifyRegistrants (result, null);
}
public /*synchronized*/ void
notifyRegistrants(AsyncResult ar)
{
internalNotifyRegistrants(ar.result, ar.exception);
}
public synchronized void
remove(Handler h)
{
for (int i = 0, s = registrants.size() ; i < s ; i++) {
Registrant r = (Registrant) registrants.get(i);
Handler rh;
rh = r.getHandler();
/* Clean up both the requested registrant and
* any now-collected registrants
*/
if (rh == null || rh == h) {
r.clear();
}
}
removeCleared();
}
}
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