1 /* 2 * Copyright (C) 2017 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 17 @file:Suppress("AddVarianceModifier") 18 19 package android.arch.persistence.room.processor.cache 20 21 import android.arch.persistence.room.processor.FieldProcessor 22 import android.arch.persistence.room.vo.EmbeddedField 23 import android.arch.persistence.room.vo.Entity 24 import android.arch.persistence.room.vo.Pojo 25 import android.arch.persistence.room.vo.Warning 26 import java.util.LinkedHashSet 27 import javax.lang.model.element.Element 28 import javax.lang.model.type.TypeMirror 29 30 /** 31 * A cache key can be used to avoid re-processing elements. 32 * <p> 33 * Each context has a cache variable that uses the same backing storage as the Root Context but 34 * adds current adapters and warning suppression list to the key. 35 */ 36 class Cache(val parent: Cache?, val converters: LinkedHashSet<TypeMirror>, 37 val suppressedWarnings: Set<Warning>) { 38 val entities: Bucket<EntityKey, Entity> = Bucket(parent?.entities) 39 val pojos: Bucket<PojoKey, Pojo> = Bucket(parent?.pojos) 40 41 inner class Bucket<K, T>(source: Bucket<K, T>?) { 42 private val entries: MutableMap<FullKey<K>, T> = source?.entries ?: mutableMapOf() 43 fun get(key : K, calculate: () -> T): T { 44 val fullKey = FullKey(converters, suppressedWarnings, key) 45 return entries.getOrPut(fullKey, { 46 calculate() 47 }) 48 } 49 } 50 51 /** 52 * Key for Entity cache 53 */ 54 data class EntityKey(val element: Element) 55 56 /** 57 * Key for Pojo cache 58 */ 59 data class PojoKey(val element: Element, val scope : FieldProcessor.BindingScope, 60 val parent : EmbeddedField?) 61 62 /** 63 * Internal key representation with adapters & warnings included. 64 * <p> 65 * Converters are kept in a linked set since the order is important for the TypeAdapterStore. 66 */ 67 private data class FullKey<T>(val converters: LinkedHashSet<TypeMirror>, 68 val suppressedWarnings: Set<Warning>, 69 val key: T) 70 } 71
