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/*
* Copyright (C) 2021 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.hardware.lights;
import android.Manifest;
import android.annotation.NonNull;
import android.annotation.RequiresPermission;
import android.content.Context;
import android.hardware.lights.LightsManager.LightsSession;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.ServiceManager.ServiceNotFoundException;
import android.util.CloseGuard;
import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.util.Preconditions;
import java.lang.ref.Reference;
import java.util.List;
/**
* The LightsManager class allows control over device lights.
*
* @hide
*/
public final class SystemLightsManager extends LightsManager {
private static final String TAG = "LightsManager";
@NonNull private final ILightsManager mService;
/**
* Creates a SystemLightsManager.
*
* @hide
*/
public SystemLightsManager(@NonNull Context context) throws ServiceNotFoundException {
this(context, ILightsManager.Stub.asInterface(
ServiceManager.getServiceOrThrow(Context.LIGHTS_SERVICE)));
}
/**
* Creates a SystemLightsManager with a provided service implementation.
*
* @hide
*/
@VisibleForTesting
public SystemLightsManager(@NonNull Context context, @NonNull ILightsManager service) {
super(context);
mService = Preconditions.checkNotNull(service);
}
/**
* Returns the lights available on the device.
*
* @return A list of available lights
*/
@RequiresPermission(Manifest.permission.CONTROL_DEVICE_LIGHTS)
@Override
public @NonNull List<Light> getLights() {
try {
return mService.getLights();
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
/**
* Returns the state of a specified light.
*
* @hide
*/
@RequiresPermission(Manifest.permission.CONTROL_DEVICE_LIGHTS)
@Override
public @NonNull LightState getLightState(@NonNull Light light) {
Preconditions.checkNotNull(light);
try {
return mService.getLightState(light.getId());
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
/**
* Creates a new LightsSession that can be used to control the device lights.
*/
@RequiresPermission(Manifest.permission.CONTROL_DEVICE_LIGHTS)
@Override
public @NonNull LightsSession openSession() {
try {
final LightsSession session = new SystemLightsSession();
mService.openSession(session.getToken(), 0);
return session;
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
/**
*
* Creates a new {@link LightsSession}
*
* @param priority the larger this number, the higher the priority of this session when multiple
* light state requests arrive simultaneously.
*
* @hide
*/
@RequiresPermission(Manifest.permission.CONTROL_DEVICE_LIGHTS)
@Override
public @NonNull LightsSession openSession(int priority) {
try {
final LightsSession session = new SystemLightsSession();
mService.openSession(session.getToken(), priority);
return session;
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
/**
* Encapsulates a session that can be used to control device lights and represents the lifetime
* of the requests.
*/
public final class SystemLightsSession extends LightsManager.LightsSession
implements AutoCloseable {
private final CloseGuard mCloseGuard = new CloseGuard();
private boolean mClosed = false;
/**
* Instantiated by {@link LightsManager#openSession()}.
*/
@RequiresPermission(Manifest.permission.CONTROL_DEVICE_LIGHTS)
private SystemLightsSession() {
mCloseGuard.open("close");
}
/**
* Sends a request to modify the states of multiple lights.
*
* <p>This method only controls lights that aren't overridden by higher-priority sessions.
* Additionally, lights not controlled by this session can be controlled by lower-priority
* sessions.
*
* @param request the settings for lights that should change
*/
@RequiresPermission(Manifest.permission.CONTROL_DEVICE_LIGHTS)
@Override
public void requestLights(@NonNull LightsRequest request) {
Preconditions.checkNotNull(request);
if (!mClosed) {
try {
List<Integer> idList = request.getLights();
List<LightState> stateList = request.getLightStates();
int[] ids = new int[idList.size()];
for (int i = 0; i < idList.size(); i++) {
ids[i] = idList.get(i);
}
LightState[] states = new LightState[stateList.size()];
for (int i = 0; i < stateList.size(); i++) {
states[i] = stateList.get(i);
}
mService.setLightStates(getToken(), ids, states);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
}
/**
* Closes the session, reverting all changes made through it.
*/
@RequiresPermission(Manifest.permission.CONTROL_DEVICE_LIGHTS)
@Override
public void close() {
if (!mClosed) {
try {
mService.closeSession(getToken());
mClosed = true;
mCloseGuard.close();
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
}
Reference.reachabilityFence(this);
}
/** @hide */
@Override
protected void finalize() throws Throwable {
try {
mCloseGuard.warnIfOpen();
close();
} finally {
super.finalize();
}
}
}
}
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