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/*
* Copyright 2020 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.uwb;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.SystemApi;
import android.os.Parcel;
import android.os.Parcelable;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
/**
* This class contains the UWB ranging data
*
* @hide
*/
@SystemApi
public final class RangingReport implements Parcelable {
private final List<RangingMeasurement> mRangingMeasurements;
private RangingReport(@NonNull List<RangingMeasurement> rangingMeasurements) {
mRangingMeasurements = rangingMeasurements;
}
/**
* Get a {@link List} of {@link RangingMeasurement} objects in the last measurement interval
* <p>The underlying UWB adapter may choose to do multiple measurements in each ranging
* interval.
*
* <p>The entries in the {@link List} are ordered in ascending order based on
* {@link RangingMeasurement#getElapsedRealtimeNanos()}
*
* @return a {@link List} of {@link RangingMeasurement} objects
*/
@NonNull
public List<RangingMeasurement> getMeasurements() {
return mRangingMeasurements;
}
/**
* @hide
*/
@Override
public boolean equals(@Nullable Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof RangingReport) {
RangingReport other = (RangingReport) obj;
return mRangingMeasurements.equals(other.getMeasurements());
}
return false;
}
/**
* @hide
*/
@Override
public int hashCode() {
return Objects.hash(mRangingMeasurements);
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(@NonNull Parcel dest, int flags) {
dest.writeTypedList(mRangingMeasurements);
}
public static final @android.annotation.NonNull Creator<RangingReport> CREATOR =
new Creator<RangingReport>() {
@Override
public RangingReport createFromParcel(Parcel in) {
Builder builder = new Builder();
builder.addMeasurements(in.createTypedArrayList(RangingMeasurement.CREATOR));
return builder.build();
}
@Override
public RangingReport[] newArray(int size) {
return new RangingReport[size];
}
};
/**
* Builder for {@link RangingReport} object
*/
public static final class Builder {
List<RangingMeasurement> mMeasurements = new ArrayList<>();
/**
* Add a single {@link RangingMeasurement}
*
* @param rangingMeasurement a ranging measurement
*/
@NonNull
public Builder addMeasurement(@NonNull RangingMeasurement rangingMeasurement) {
mMeasurements.add(rangingMeasurement);
return this;
}
/**
* Add a {@link List} of {@link RangingMeasurement}s
*
* @param rangingMeasurements {@link List} of {@link RangingMeasurement}s to add
*/
@NonNull
public Builder addMeasurements(@NonNull List<RangingMeasurement> rangingMeasurements) {
mMeasurements.addAll(rangingMeasurements);
return this;
}
/**
* Build the {@link RangingReport} object
*
* @throws IllegalStateException if measurements are not in monotonically increasing order
*/
@NonNull
public RangingReport build() {
// Verify that all measurement timestamps are monotonically increasing
RangingMeasurement prevMeasurement = null;
for (int curIndex = 0; curIndex < mMeasurements.size(); curIndex++) {
RangingMeasurement curMeasurement = mMeasurements.get(curIndex);
if (prevMeasurement != null
&& (prevMeasurement.getElapsedRealtimeNanos()
> curMeasurement.getElapsedRealtimeNanos())) {
throw new IllegalStateException(
"Timestamp (" + curMeasurement.getElapsedRealtimeNanos()
+ ") at index " + curIndex + " is less than previous timestamp ("
+ prevMeasurement.getElapsedRealtimeNanos() + ")");
}
prevMeasurement = curMeasurement;
}
return new RangingReport(mMeasurements);
}
}
}
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