| /* |
| * 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.os.Parcel; |
| import android.os.Parcelable; |
| |
| import java.util.Arrays; |
| |
| /** |
| * A class representing a UWB address |
| * |
| * @hide |
| */ |
| 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]; |
| } |
| }; |
| } |