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/*
* Copyright (C) 2006 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;
import android.os.AsyncResult;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import com.android.internal.telephony.CommandException;
/**
* {@hide}
*/
public abstract class CallTracker extends Handler {
private static final boolean DBG_POLL = false;
//***** Constants
static final int POLL_DELAY_MSEC = 250;
protected int pendingOperations;
protected boolean needsPoll;
protected Message lastRelevantPoll;
public CommandsInterface cm;
//***** Events
protected static final int EVENT_POLL_CALLS_RESULT = 1;
protected static final int EVENT_CALL_STATE_CHANGE = 2;
protected static final int EVENT_REPOLL_AFTER_DELAY = 3;
protected static final int EVENT_OPERATION_COMPLETE = 4;
protected static final int EVENT_GET_LAST_CALL_FAIL_CAUSE = 5;
protected static final int EVENT_SWITCH_RESULT = 8;
protected static final int EVENT_RADIO_AVAILABLE = 9;
protected static final int EVENT_RADIO_NOT_AVAILABLE = 10;
protected static final int EVENT_CONFERENCE_RESULT = 11;
protected static final int EVENT_SEPARATE_RESULT = 12;
protected static final int EVENT_ECT_RESULT = 13;
protected void pollCallsWhenSafe() {
needsPoll = true;
if (checkNoOperationsPending()) {
lastRelevantPoll = obtainMessage(EVENT_POLL_CALLS_RESULT);
cm.getCurrentCalls(lastRelevantPoll);
}
}
protected void
pollCallsAfterDelay() {
Message msg = obtainMessage();
msg.what = EVENT_REPOLL_AFTER_DELAY;
sendMessageDelayed(msg, POLL_DELAY_MSEC);
}
protected boolean
isCommandExceptionRadioNotAvailable(Throwable e) {
return e != null && e instanceof CommandException
&& ((CommandException)e).getCommandError()
== CommandException.Error.RADIO_NOT_AVAILABLE;
}
protected abstract void handlePollCalls(AsyncResult ar);
protected void handleRadioAvailable() {
pollCallsWhenSafe();
}
/**
* Obtain a complete message that indicates that this operation
* does not require polling of getCurrentCalls(). However, if other
* operations that do need getCurrentCalls() are pending or are
* scheduled while this operation is pending, the invocation
* of getCurrentCalls() will be postponed until this
* operation is also complete.
*/
protected Message
obtainNoPollCompleteMessage(int what) {
pendingOperations++;
lastRelevantPoll = null;
return obtainMessage(what);
}
/**
* @return true if we're idle or there's a call to getCurrentCalls() pending
* but nothing else
*/
private boolean
checkNoOperationsPending() {
if (DBG_POLL) log("checkNoOperationsPending: pendingOperations=" +
pendingOperations);
return pendingOperations == 0;
}
//***** Overridden from Handler
public abstract void handleMessage (Message msg);
protected abstract void log(String msg);
}
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