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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.devicestate;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.Parcel;
import android.os.Parcelable;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Arrays;
import java.util.Objects;
import java.util.concurrent.Executor;
/**
* Information about the state of the device.
*
* @hide
*/
public final class DeviceStateInfo implements Parcelable {
/** Bit that indicates the {@link #supportedStates} field has changed. */
public static final int CHANGED_SUPPORTED_STATES = 1 << 0;
/** Bit that indicates the {@link #baseState} field has changed. */
public static final int CHANGED_BASE_STATE = 1 << 1;
/** Bit that indicates the {@link #currentState} field has changed. */
public static final int CHANGED_CURRENT_STATE = 1 << 2;
@IntDef(prefix = {"CHANGED_"}, flag = true, value = {
CHANGED_SUPPORTED_STATES,
CHANGED_BASE_STATE,
CHANGED_CURRENT_STATE,
})
@Retention(RetentionPolicy.SOURCE)
public @interface ChangeFlags {}
/**
* The list of states supported by the device.
*/
@NonNull
public final int[] supportedStates;
/**
* The base (non-override) state of the device. The base state is the state of the device
* ignoring any override requests made through a call to {@link DeviceStateManager#requestState(
* DeviceStateRequest, Executor, DeviceStateRequest.Callback)}.
*/
public final int baseState;
/**
* The state of the device.
*/
public final int currentState;
/**
* Creates a new instance of {@link DeviceStateInfo}.
* <p>
* NOTE: Unlike {@link #DeviceStateInfo(DeviceStateInfo)}, this constructor does not copy the
* supplied parameters.
*/
public DeviceStateInfo(@NonNull int[] supportedStates, int baseState, int state) {
this.supportedStates = supportedStates;
this.baseState = baseState;
this.currentState = state;
}
/**
* Creates a new instance of {@link DeviceStateInfo} copying the fields of {@code info} into
* the fields of the returned instance.
*/
public DeviceStateInfo(@NonNull DeviceStateInfo info) {
this(Arrays.copyOf(info.supportedStates, info.supportedStates.length),
info.baseState, info.currentState);
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) return true;
if (other == null || getClass() != other.getClass()) return false;
DeviceStateInfo that = (DeviceStateInfo) other;
return baseState == that.baseState
&& currentState == that.currentState
&& Arrays.equals(supportedStates, that.supportedStates);
}
@Override
public int hashCode() {
int result = Objects.hash(baseState, currentState);
result = 31 * result + Arrays.hashCode(supportedStates);
return result;
}
/** Returns a bitmask of the differences between this instance and {@code other}. */
@ChangeFlags
public int diff(@NonNull DeviceStateInfo other) {
int diff = 0;
if (!Arrays.equals(supportedStates, other.supportedStates)) {
diff |= CHANGED_SUPPORTED_STATES;
}
if (baseState != other.baseState) {
diff |= CHANGED_BASE_STATE;
}
if (currentState != other.currentState) {
diff |= CHANGED_CURRENT_STATE;
}
return diff;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(supportedStates.length);
for (int i = 0; i < supportedStates.length; i++) {
dest.writeInt(supportedStates[i]);
}
dest.writeInt(baseState);
dest.writeInt(currentState);
}
@Override
public int describeContents() {
return 0;
}
public static final @NonNull Creator<DeviceStateInfo> CREATOR = new Creator<DeviceStateInfo>() {
@Override
public DeviceStateInfo createFromParcel(Parcel source) {
final int numberOfSupportedStates = source.readInt();
final int[] supportedStates = new int[numberOfSupportedStates];
for (int i = 0; i < numberOfSupportedStates; i++) {
supportedStates[i] = source.readInt();
}
final int baseState = source.readInt();
final int currentState = source.readInt();
return new DeviceStateInfo(supportedStates, baseState, currentState);
}
@Override
public DeviceStateInfo[] newArray(int size) {
return new DeviceStateInfo[size];
}
};
}
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