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/*
* Copyright (C) 2010 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.bluetooth;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Message;
import android.util.Log;
import com.android.internal.util.HierarchicalState;
import com.android.internal.util.HierarchicalStateMachine;
/**
* This state machine is used to serialize the connections
* to a particular profile. Currently, we only allow one device
* to be connected to a particular profile.
* States:
* {@link StableState} : No pending commands. Send the
* command to the appropriate remote device specific state machine.
*
* {@link PendingCommandState} : A profile connection / disconnection
* command is being executed. This will result in a profile state
* change. Defer all commands.
* @hide
*/
public class BluetoothProfileState extends HierarchicalStateMachine {
private static final boolean DBG = true; // STOPSHIP - change to false.
private static final String TAG = "BluetoothProfileState";
public static int HFP = 0;
public static int A2DP = 1;
private static int TRANSITION_TO_STABLE = 100;
private int mProfile;
private BluetoothDevice mPendingDevice;
private PendingCommandState mPendingCommandState = new PendingCommandState();
private StableState mStableState = new StableState();
private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(BluetoothHeadset.ACTION_STATE_CHANGED)) {
int newState = intent.getIntExtra(BluetoothHeadset.EXTRA_STATE, 0);
if (mProfile == HFP && (newState == BluetoothHeadset.STATE_CONNECTED ||
newState == BluetoothHeadset.STATE_DISCONNECTED)) {
sendMessage(TRANSITION_TO_STABLE);
}
} else if (action.equals(BluetoothA2dp.ACTION_SINK_STATE_CHANGED)) {
int newState = intent.getIntExtra(BluetoothA2dp.EXTRA_SINK_STATE, 0);
if (mProfile == A2DP && (newState == BluetoothA2dp.STATE_CONNECTED ||
newState == BluetoothA2dp.STATE_DISCONNECTED)) {
sendMessage(TRANSITION_TO_STABLE);
}
}
}
};
public BluetoothProfileState(Context context, int profile) {
super("BluetoothProfileState:" + profile);
mProfile = profile;
addState(mStableState);
addState(mPendingCommandState);
setInitialState(mStableState);
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothA2dp.ACTION_SINK_STATE_CHANGED);
filter.addAction(BluetoothHeadset.ACTION_STATE_CHANGED);
context.registerReceiver(mBroadcastReceiver, filter);
}
private class StableState extends HierarchicalState {
@Override
protected void enter() {
log("Entering Stable State");
mPendingDevice = null;
}
@Override
protected boolean processMessage(Message msg) {
if (msg.what != TRANSITION_TO_STABLE) {
transitionTo(mPendingCommandState);
}
return true;
}
}
private class PendingCommandState extends HierarchicalState {
@Override
protected void enter() {
log("Entering PendingCommandState State");
dispatchMessage(getCurrentMessage());
}
@Override
protected boolean processMessage(Message msg) {
if (msg.what == TRANSITION_TO_STABLE) {
transitionTo(mStableState);
} else {
dispatchMessage(msg);
}
return true;
}
private void dispatchMessage(Message msg) {
BluetoothDeviceProfileState deviceProfileMgr =
(BluetoothDeviceProfileState)msg.obj;
int cmd = msg.arg1;
if (mPendingDevice == null || mPendingDevice.equals(deviceProfileMgr.getDevice())) {
mPendingDevice = deviceProfileMgr.getDevice();
deviceProfileMgr.sendMessage(cmd);
} else {
Message deferMsg = new Message();
deferMsg.arg1 = cmd;
deferMsg.obj = deviceProfileMgr;
deferMessage(deferMsg);
}
}
}
private void log(String message) {
if (DBG) {
Log.i(TAG, "Message:" + message);
}
}
}
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