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 package androidx.room.solver.binderprovider
18 
19 import androidx.room.compiler.processing.XType
20 import androidx.room.parser.ParsedQuery
21 import androidx.room.processor.Context
22 import androidx.room.solver.ObservableQueryResultBinderProvider
23 import androidx.room.solver.QueryResultBinderProvider
24 import androidx.room.solver.RxType
25 import androidx.room.solver.TypeAdapterExtras
26 import androidx.room.solver.query.result.QueryResultBinder
27 import androidx.room.solver.query.result.RxLambdaQueryResultBinder
28 
29 class RxLambdaQueryResultBinderProvider
30 private constructor(val context: Context, private val rxType: RxType) : QueryResultBinderProvider {
providenull31     override fun provide(
32         declared: XType,
33         query: ParsedQuery,
34         extras: TypeAdapterExtras
35     ): QueryResultBinder {
36         // Add info that the type mirror is hardcoded into a Kotlin Nullable for Callable
37         extras.putData(
38             ObservableQueryResultBinderProvider.OriginalTypeArg::class,
39             ObservableQueryResultBinderProvider.OriginalTypeArg(declared)
40         )
41         val typeArg = extractTypeArg(declared)
42         val adapter = context.typeAdapterStore.findQueryResultAdapter(typeArg, query, extras)
43         return RxLambdaQueryResultBinder(rxType, typeArg, adapter)
44     }
45 
matchesnull46     override fun matches(declared: XType): Boolean =
47         declared.typeArguments.size == 1 && matchesRxType(declared)
48 
49     private fun matchesRxType(declared: XType): Boolean {
50         return declared.rawType.asTypeName() == rxType.className
51     }
52 
extractTypeArgnull53     private fun extractTypeArg(declared: XType): XType {
54         // Maybe is always expected to be built with a Callable containing a nullable type argument
55         return if (rxType.canBeNull || rxType.isSingle()) {
56             declared.typeArguments.first().makeNullable()
57         } else {
58             declared.typeArguments.first()
59         }
60     }
61 
62     companion object {
getAllnull63         fun getAll(context: Context) =
64             listOf(RxType.RX2_SINGLE, RxType.RX2_MAYBE, RxType.RX3_SINGLE, RxType.RX3_MAYBE).map {
65                 RxLambdaQueryResultBinderProvider(context, it)
66                     .requireArtifact(
67                         context = context,
68                         requiredType = it.version.rxMarkerClassName,
69                         missingArtifactErrorMsg = it.version.missingArtifactMessage
70                     )
71             }
72     }
73 }
74