/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.location;
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import android.content.Context;
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import android.location.GnssNavigationMessage;
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import android.location.IGnssNavigationMessageListener;
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import android.os.Handler;
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import android.os.RemoteException;
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import android.util.Log;
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import com.android.internal.annotations.VisibleForTesting;
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/**
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* An base implementation for GPS navigation messages provider.
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* It abstracts out the responsibility of handling listeners, while still allowing technology
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* specific implementations to be built.
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*
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* @hide
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*/
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public abstract class GnssNavigationMessageProvider
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extends RemoteListenerHelper<IGnssNavigationMessageListener> {
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private static final String TAG = "GnssNavigationMessageProvider";
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private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
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private final GnssNavigationMessageProviderNative mNative;
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private boolean mCollectionStarted;
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protected GnssNavigationMessageProvider(Context context, Handler handler) {
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this(context, handler, new GnssNavigationMessageProviderNative());
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}
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@VisibleForTesting
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GnssNavigationMessageProvider(Context context, Handler handler,
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GnssNavigationMessageProviderNative aNative) {
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super(context, handler, TAG);
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mNative = aNative;
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}
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void resumeIfStarted() {
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if (DEBUG) {
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Log.d(TAG, "resumeIfStarted");
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}
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if (mCollectionStarted) {
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mNative.startNavigationMessageCollection();
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}
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}
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@Override
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protected boolean isAvailableInPlatform() {
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return mNative.isNavigationMessageSupported();
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}
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@Override
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protected int registerWithService() {
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boolean result = mNative.startNavigationMessageCollection();
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if (result) {
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mCollectionStarted = true;
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return RemoteListenerHelper.RESULT_SUCCESS;
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} else {
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return RemoteListenerHelper.RESULT_INTERNAL_ERROR;
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}
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}
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@Override
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protected void unregisterFromService() {
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boolean stopped = mNative.stopNavigationMessageCollection();
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if (stopped) {
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mCollectionStarted = false;
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}
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}
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public void onNavigationMessageAvailable(final GnssNavigationMessage event) {
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foreach((IGnssNavigationMessageListener listener, CallerIdentity callerIdentity) -> {
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listener.onGnssNavigationMessageReceived(event);
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}
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);
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}
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/** Handle GNSS capabilities update from the GNSS HAL implementation */
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public void onCapabilitiesUpdated(boolean isGnssNavigationMessageSupported) {
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setSupported(isGnssNavigationMessageSupported);
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updateResult();
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}
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public void onGpsEnabledChanged() {
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tryUpdateRegistrationWithService();
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updateResult();
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}
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@Override
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protected ListenerOperation<IGnssNavigationMessageListener> getHandlerOperation(int result) {
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int status;
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switch (result) {
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case RESULT_SUCCESS:
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status = GnssNavigationMessage.Callback.STATUS_READY;
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break;
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case RESULT_NOT_AVAILABLE:
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case RESULT_NOT_SUPPORTED:
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case RESULT_INTERNAL_ERROR:
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status = GnssNavigationMessage.Callback.STATUS_NOT_SUPPORTED;
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break;
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case RESULT_GPS_LOCATION_DISABLED:
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status = GnssNavigationMessage.Callback.STATUS_LOCATION_DISABLED;
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break;
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case RESULT_UNKNOWN:
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return null;
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default:
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Log.v(TAG, "Unhandled addListener result: " + result);
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return null;
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}
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return new StatusChangedOperation(status);
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}
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private static class StatusChangedOperation
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implements ListenerOperation<IGnssNavigationMessageListener> {
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private final int mStatus;
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public StatusChangedOperation(int status) {
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mStatus = status;
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}
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@Override
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public void execute(IGnssNavigationMessageListener listener,
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CallerIdentity callerIdentity) throws RemoteException {
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listener.onStatusChanged(mStatus);
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}
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}
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@VisibleForTesting
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static class GnssNavigationMessageProviderNative {
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public boolean isNavigationMessageSupported() {
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return native_is_navigation_message_supported();
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}
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public boolean startNavigationMessageCollection() {
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return native_start_navigation_message_collection();
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}
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public boolean stopNavigationMessageCollection() {
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return native_stop_navigation_message_collection();
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}
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}
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private static native boolean native_is_navigation_message_supported();
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private static native boolean native_start_navigation_message_collection();
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private static native boolean native_stop_navigation_message_collection();
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}
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