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/*
* Copyright (C) 2007 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.internal.telephony.gsm.stk;
import com.android.internal.telephony.gsm.SIMFileHandler;
import com.android.internal.telephony.gsm.SimUtils;
import android.os.Handler;
import android.os.HandlerState;
import android.os.HandlerStateMachine;
import android.os.Message;
/**
* Class used for queuing raw ril messages, decoding them into CommanParams
* objects and sending the result back to the STK Service.
*/
class RilMessageDecoder extends HandlerStateMachine {
// constants
private static final int START = 1;
private static final int CMD_PARAMS_READY = 2;
// members
private static RilMessageDecoder sInstance = null;
private CommandParamsFactory mCmdParamsFactory = null;
private RilMessage mCurrentRilMessage = null;
private Handler mCaller = null;
// States
private StateStart mStateStart = new StateStart();
private StateCmdParamsReady mStateCmdParamsReady = new StateCmdParamsReady();
/**
* Get the singleton instance, constructing if necessary.
*
* @param caller
* @param fh
* @return RilMesssageDecoder
*/
public static synchronized RilMessageDecoder getInstance(Handler caller, SIMFileHandler fh) {
if (sInstance == null) {
sInstance = new RilMessageDecoder(caller, fh);
}
return sInstance;
}
/**
* Start decoding the message parameters,
* when complete MSG_ID_RIL_MSG_DECODED will be returned to caller.
*
* @param rilMsg
*/
public void sendStartDecodingMessageParams(RilMessage rilMsg) {
Message msg = obtainMessage(START);
msg.obj = rilMsg;
sendMessage(msg);
}
/**
* The command parameters have been decoded.
*
* @param resCode
* @param cmdParams
*/
public void sendMessageParamsDecoded(ResultCode resCode, CommandParams cmdParams) {
Message msg = obtainMessage(RilMessageDecoder.CMD_PARAMS_READY);
msg.arg1 = resCode.value();
msg.obj = cmdParams;
sendMessage(msg);
}
private void sendCmdForExecution(RilMessage rilMsg) {
Message msg = mCaller.obtainMessage(StkService.MSG_ID_RIL_MSG_DECODED,
new RilMessage(rilMsg));
msg.sendToTarget();
}
private RilMessageDecoder(Handler caller, SIMFileHandler fh) {
super("RilMessageDecoder");
setDbg(false);
setInitialState(mStateStart);
mCaller = caller;
mCmdParamsFactory = CommandParamsFactory.getInstance(this, fh);
}
private class StateStart extends HandlerState {
@Override public void processMessage(Message msg) {
if (msg.what == START) {
if (decodeMessageParams((RilMessage)msg.obj)) {
transitionTo(mStateCmdParamsReady);
}
} else {
StkLog.d(this, "StateStart unexpected expecting START=" +
START + " got " + msg.what);
}
}
}
private class StateCmdParamsReady extends HandlerState {
@Override public void processMessage(Message msg) {
if (msg.what == CMD_PARAMS_READY) {
mCurrentRilMessage.mResCode = ResultCode.fromInt(msg.arg1);
mCurrentRilMessage.mData = msg.obj;
sendCmdForExecution(mCurrentRilMessage);
transitionTo(mStateStart);
} else {
StkLog.d(this, "StateCmdParamsReady expecting CMD_PARAMS_READY="
+ CMD_PARAMS_READY + " got " + msg.what);
deferMessage(msg);
}
}
}
private boolean decodeMessageParams(RilMessage rilMsg) {
boolean decodingStarted;
mCurrentRilMessage = rilMsg;
switch(rilMsg.mId) {
case StkService.MSG_ID_SESSION_END:
case StkService.MSG_ID_CALL_SETUP:
mCurrentRilMessage.mResCode = ResultCode.OK;
sendCmdForExecution(mCurrentRilMessage);
decodingStarted = false;
break;
case StkService.MSG_ID_PROACTIVE_COMMAND:
case StkService.MSG_ID_EVENT_NOTIFY:
case StkService.MSG_ID_REFRESH:
byte[] rawData = null;
try {
rawData = SimUtils.hexStringToBytes((String) rilMsg.mData);
} catch (Exception e) {
// zombie messages are dropped
StkLog.d(this, "decodeMessageParams dropping zombie messages");
decodingStarted = false;
break;
}
try {
// Start asynch parsing of the command parameters.
mCmdParamsFactory.make(BerTlv.decode(rawData));
decodingStarted = true;
} catch (ResultException e) {
// send to Service for proper RIL communication.
mCurrentRilMessage.mResCode = e.result();
sendCmdForExecution(mCurrentRilMessage);
decodingStarted = false;
}
break;
default:
decodingStarted = false;
break;
}
return decodingStarted;
}
}
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