| /* |
| * 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); |
| } |
| } |
| } |