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/*
* Copyright (C) 2008 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.app.ActivityManagerNative;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.os.UEventObserver;
import android.util.Log;
import java.io.FileReader;
import java.io.FileNotFoundException;
/**
* <p>DockObserver monitors for a docking station.
*/
class DockObserver extends UEventObserver {
private static final String TAG = DockObserver.class.getSimpleName();
private static final boolean LOG = false;
private static final String DOCK_UEVENT_MATCH = "DEVPATH=/devices/virtual/switch/dock";
private static final String DOCK_STATE_PATH = "/sys/class/switch/dock/state";
private int mDockState;
private boolean mPendingIntent;
private final Context mContext;
public DockObserver(Context context) {
mContext = context;
startObserving(DOCK_UEVENT_MATCH);
init(); // set initial status
}
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Dock UEVENT: " + event.toString());
}
try {
update(Integer.parseInt(event.get("SWITCH_STATE")));
} catch (NumberFormatException e) {
Log.e(TAG, "Could not parse switch state from event " + event);
}
}
private synchronized final void init() {
char[] buffer = new char[1024];
int newState = mDockState;
try {
FileReader file = new FileReader(DOCK_STATE_PATH);
int len = file.read(buffer, 0, 1024);
newState = Integer.valueOf((new String(buffer, 0, len)).trim());
} catch (FileNotFoundException e) {
Log.w(TAG, "This kernel does not have dock station support");
} catch (Exception e) {
Log.e(TAG, "" , e);
}
update(newState);
}
private synchronized final void update(int newState) {
if (newState != mDockState) {
mDockState = newState;
mPendingIntent = true;
mHandler.sendEmptyMessage(0);
}
}
private synchronized final void sendIntent() {
// Pack up the values and broadcast them to everyone
Intent intent = new Intent(Intent.ACTION_DOCK_EVENT);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.putExtra(Intent.EXTRA_DOCK_STATE, mDockState);
// TODO: Should we require a permission?
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Broadcasting dock state " + mDockState);
}
ActivityManagerNative.broadcastStickyIntent(intent, null);
}
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (mPendingIntent) {
sendIntent();
mPendingIntent = false;
}
}
};
}
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