| /* |
| * Copyright 2017 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 androidx.room.vo |
| |
| import org.apache.commons.codec.digest.DigestUtils |
| import java.util.Locale |
| |
| interface HasSchemaIdentity { |
| fun getIdKey(): String |
| } |
| |
| /** |
| * A class that can be converted into a unique identifier for an object |
| */ |
| class SchemaIdentityKey { |
| companion object { |
| private val SEPARATOR = "?:?" |
| private val ENGLISH_SORT = Comparator<String> { o1, o2 -> |
| o1.lowercase(Locale.ENGLISH).compareTo(o2.lowercase(Locale.ENGLISH)) |
| } |
| } |
| |
| private val sb = StringBuilder() |
| fun append(identity: HasSchemaIdentity) { |
| append(identity.getIdKey()) |
| } |
| |
| fun appendSorted(identities: List<HasSchemaIdentity>) { |
| identities.map { it.getIdKey() }.sortedWith(ENGLISH_SORT).forEach { |
| append(it) |
| } |
| } |
| |
| fun hash() = DigestUtils.md5Hex(sb.toString()) |
| fun append(identity: String) { |
| sb.append(identity).append(SEPARATOR) |
| } |
| } |