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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.input;
import android.annotation.NonNull;
import android.app.ActivityThread;
import android.hardware.lights.Light;
import android.hardware.lights.LightState;
import android.hardware.lights.LightsManager;
import android.hardware.lights.LightsRequest;
import android.util.CloseGuard;
import com.android.internal.util.Preconditions;
import java.lang.ref.Reference;
import java.util.List;
/**
* LightsManager manages an input device's lights {@link android.hardware.input.Light}.
*/
class InputDeviceLightsManager extends LightsManager {
private static final String TAG = "InputDeviceLightsManager";
private static final boolean DEBUG = false;
private final InputManager mInputManager;
// The input device ID.
private final int mDeviceId;
// Package name
private final String mPackageName;
InputDeviceLightsManager(InputManager inputManager, int deviceId) {
super(ActivityThread.currentActivityThread().getSystemContext());
mInputManager = inputManager;
mDeviceId = deviceId;
mPackageName = ActivityThread.currentPackageName();
}
/**
* Returns the lights available on the device.
*
* @return A list of available lights
*/
@Override
public @NonNull List<Light> getLights() {
return mInputManager.getLights(mDeviceId);
}
/**
* Returns the state of a specified light.
*
* @hide
*/
@Override
public @NonNull LightState getLightState(@NonNull Light light) {
Preconditions.checkNotNull(light);
return mInputManager.getLightState(mDeviceId, light);
}
/**
* Creates a new LightsSession that can be used to control the device lights.
*/
@Override
public @NonNull LightsSession openSession() {
final LightsSession session = new InputDeviceLightsSession();
mInputManager.openLightSession(mDeviceId, mPackageName, session.getToken());
return session;
}
@Override
public @NonNull LightsSession openSession(int priority) {
throw new UnsupportedOperationException();
}
/**
* Encapsulates a session that can be used to control device lights and represents the lifetime
* of the requests.
*/
public final class InputDeviceLightsSession extends LightsManager.LightsSession
implements AutoCloseable {
private final CloseGuard mCloseGuard = new CloseGuard();
private boolean mClosed = false;
/**
* Instantiated by {@link LightsManager#openSession()}.
*/
private InputDeviceLightsSession() {
mCloseGuard.open("InputDeviceLightsSession.close");
}
/**
* Sends a request to modify the states of multiple lights.
*
* @param request the settings for lights that should change
*/
@Override
public void requestLights(@NonNull LightsRequest request) {
Preconditions.checkNotNull(request);
Preconditions.checkArgument(!mClosed);
mInputManager.requestLights(mDeviceId, request, getToken());
}
/**
* Closes the session, reverting all changes made through it.
*/
@Override
public void close() {
if (!mClosed) {
mInputManager.closeLightSession(mDeviceId, getToken());
mClosed = true;
mCloseGuard.close();
}
Reference.reachabilityFence(this);
}
/** @hide */
@Override
protected void finalize() throws Throwable {
try {
mCloseGuard.warnIfOpen();
close();
} finally {
super.finalize();
}
}
}
}
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