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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.Arrays;
/**
* A class representing a UWB address
*
* @hide
*/
@SystemApi
public final class UwbAddress implements Parcelable {
public static final int SHORT_ADDRESS_BYTE_LENGTH = 2;
public static final int EXTENDED_ADDRESS_BYTE_LENGTH = 8;
private final byte[] mAddressBytes;
private UwbAddress(byte[] address) {
mAddressBytes = address;
}
/**
* Create a {@link UwbAddress} from a byte array.
*
* <p>If the provided array is {@link #SHORT_ADDRESS_BYTE_LENGTH} bytes, a short address is
* created. If the provided array is {@link #EXTENDED_ADDRESS_BYTE_LENGTH} bytes, then an
* extended address is created.
*
* @param address a byte array to convert to a {@link UwbAddress}
* @return a {@link UwbAddress} created from the input byte array
* @throws IllegalArgumentException when the length is not one of
* {@link #SHORT_ADDRESS_BYTE_LENGTH} or {@link #EXTENDED_ADDRESS_BYTE_LENGTH} bytes
*/
@NonNull
public static UwbAddress fromBytes(@NonNull byte[] address) {
if (address.length != SHORT_ADDRESS_BYTE_LENGTH
&& address.length != EXTENDED_ADDRESS_BYTE_LENGTH) {
throw new IllegalArgumentException("Invalid UwbAddress length " + address.length);
}
return new UwbAddress(address);
}
/**
* Get the address as a byte array
*
* @return the byte representation of this {@link UwbAddress}
*/
@NonNull
public byte[] toBytes() {
return mAddressBytes;
}
/**
* The length of the address in bytes
* <p>Possible values are {@link #SHORT_ADDRESS_BYTE_LENGTH} and
* {@link #EXTENDED_ADDRESS_BYTE_LENGTH}.
*/
public int size() {
return mAddressBytes.length;
}
@NonNull
@Override
public String toString() {
StringBuilder builder = new StringBuilder("0x");
for (byte addressByte : mAddressBytes) {
builder.append(String.format("%02X", addressByte));
}
return builder.toString();
}
@Override
public boolean equals(@Nullable Object obj) {
if (obj instanceof UwbAddress) {
return Arrays.equals(mAddressBytes, ((UwbAddress) obj).toBytes());
}
return false;
}
@Override
public int hashCode() {
return Arrays.hashCode(mAddressBytes);
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(@NonNull Parcel dest, int flags) {
dest.writeInt(mAddressBytes.length);
dest.writeByteArray(mAddressBytes);
}
public static final @android.annotation.NonNull Creator<UwbAddress> CREATOR =
new Creator<UwbAddress>() {
@Override
public UwbAddress createFromParcel(Parcel in) {
byte[] address = new byte[in.readInt()];
in.readByteArray(address);
return UwbAddress.fromBytes(address);
}
@Override
public UwbAddress[] newArray(int size) {
return new UwbAddress[size];
}
};
}
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