1 /* 2 * Copyright 2021 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 @file:JvmName("UUIDUtil") 17 @file:RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX) // used in generated code 18 19 package androidx.room.util 20 21 import androidx.annotation.RestrictTo 22 import java.nio.ByteBuffer 23 import java.util.UUID 24 25 /** UUID / byte[] two-way conversion utility for Room */ 26 27 /** 28 * Converts a 16-bytes array BLOB into a UUID pojo 29 * 30 * @param bytes byte array stored in database as BLOB 31 * @return a UUID object created based on the provided byte array 32 */ convertByteToUUIDnull33fun convertByteToUUID(bytes: ByteArray): UUID { 34 val buffer = ByteBuffer.wrap(bytes) 35 val firstLong = buffer.long 36 val secondLong = buffer.long 37 return UUID(firstLong, secondLong) 38 } 39 40 /** 41 * Converts a UUID pojo into a 16-bytes array to store into database as BLOB 42 * 43 * @param uuid the UUID pojo 44 * @return a byte array to store into database 45 */ convertUUIDToBytenull46fun convertUUIDToByte(uuid: UUID): ByteArray { 47 val bytes = ByteArray(16) 48 val buffer = ByteBuffer.wrap(bytes) 49 buffer.putLong(uuid.mostSignificantBits) 50 buffer.putLong(uuid.leastSignificantBits) 51 return buffer.array() 52 } 53