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/*
* Copyright (C) 2011 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 com.android.server;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Handler;
import android.os.UserHandle;
import com.google.common.collect.Lists;
import com.google.common.util.concurrent.AbstractFuture;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
/**
* {@link ContextWrapper} that can attach listeners for upcoming
* {@link Context#sendBroadcast(Intent)}.
*/
public class BroadcastInterceptingContext extends ContextWrapper {
private static final String TAG = "WatchingContext";
private final List<BroadcastInterceptor> mInterceptors = Lists.newArrayList();
public class BroadcastInterceptor extends AbstractFuture<Intent> {
private final BroadcastReceiver mReceiver;
private final IntentFilter mFilter;
public BroadcastInterceptor(BroadcastReceiver receiver, IntentFilter filter) {
mReceiver = receiver;
mFilter = filter;
}
public boolean dispatchBroadcast(Intent intent) {
if (mFilter.match(getContentResolver(), intent, false, TAG) > 0) {
if (mReceiver != null) {
final Context context = BroadcastInterceptingContext.this;
mReceiver.onReceive(context, intent);
return false;
} else {
set(intent);
return true;
}
} else {
return false;
}
}
@Override
public Intent get() throws InterruptedException, ExecutionException {
try {
return get(5, TimeUnit.SECONDS);
} catch (TimeoutException e) {
throw new RuntimeException(e);
}
}
}
public BroadcastInterceptingContext(Context base) {
super(base);
}
public Future<Intent> nextBroadcastIntent(String action) {
return nextBroadcastIntent(new IntentFilter(action));
}
public Future<Intent> nextBroadcastIntent(IntentFilter filter) {
final BroadcastInterceptor interceptor = new BroadcastInterceptor(null, filter);
synchronized (mInterceptors) {
mInterceptors.add(interceptor);
}
return interceptor;
}
@Override
public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter) {
synchronized (mInterceptors) {
mInterceptors.add(new BroadcastInterceptor(receiver, filter));
}
return null;
}
@Override
public Intent registerReceiver(BroadcastReceiver receiver, IntentFilter filter,
String broadcastPermission, Handler scheduler) {
return registerReceiver(receiver, filter);
}
@Override
public void unregisterReceiver(BroadcastReceiver receiver) {
synchronized (mInterceptors) {
final Iterator<BroadcastInterceptor> i = mInterceptors.iterator();
while (i.hasNext()) {
final BroadcastInterceptor interceptor = i.next();
if (receiver.equals(interceptor.mReceiver)) {
i.remove();
}
}
}
}
@Override
public void sendBroadcast(Intent intent) {
synchronized (mInterceptors) {
final Iterator<BroadcastInterceptor> i = mInterceptors.iterator();
while (i.hasNext()) {
final BroadcastInterceptor interceptor = i.next();
if (interceptor.dispatchBroadcast(intent)) {
i.remove();
}
}
}
}
@Override
public void sendBroadcast(Intent intent, String receiverPermission) {
sendBroadcast(intent);
}
@Override
public void sendBroadcast(Intent intent, String[] receiverPermissions) {
sendBroadcast(intent);
}
@Override
public void sendBroadcastAsUser(Intent intent, UserHandle user) {
sendBroadcast(intent);
}
@Override
public void sendBroadcastAsUser(Intent intent, UserHandle user,
String receiverPermission) {
sendBroadcast(intent);
}
@Override
public void sendStickyBroadcast(Intent intent) {
sendBroadcast(intent);
}
@Override
public void sendStickyBroadcastAsUser(Intent intent, UserHandle user) {
sendBroadcast(intent);
}
@Override
public void removeStickyBroadcast(Intent intent) {
// ignored
}
}
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