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.ext.RoomRxJava2TypeNames
20 import androidx.room.ext.RxJava2TypeNames
21 import androidx.room.processor.Context
22 import androidx.room.processor.ProcessorErrors
23 import androidx.room.solver.ObservableQueryResultBinderProvider
24 import androidx.room.solver.query.result.FlowableQueryResultBinder
25 import androidx.room.solver.query.result.QueryResultAdapter
26 import androidx.room.solver.query.result.QueryResultBinder
27 import javax.lang.model.type.DeclaredType
28 import javax.lang.model.type.TypeMirror
29 
30 class FlowableQueryResultBinderProvider(context: Context) :
31         ObservableQueryResultBinderProvider(context) {
<lambda>null32     private val flowableTypeMirror: TypeMirror? by lazy {
33         context.processingEnv.elementUtils
34                 .getTypeElement(RxJava2TypeNames.FLOWABLE.toString())?.asType()
35     }
36 
<lambda>null37     private val hasRxJava2Artifact by lazy {
38         context.processingEnv.elementUtils
39                 .getTypeElement(RoomRxJava2TypeNames.RX_ROOM.toString()) != null
40     }
41 
extractTypeArgnull42     override fun extractTypeArg(declared: DeclaredType): TypeMirror = declared.typeArguments.first()
43 
44     override fun create(typeArg: TypeMirror, resultAdapter: QueryResultAdapter?,
45                         tableNames: Set<String>): QueryResultBinder {
46         return FlowableQueryResultBinder(
47                 typeArg = typeArg,
48                 queryTableNames = tableNames,
49                 adapter = resultAdapter)
50     }
51 
matchesnull52     override fun matches(declared: DeclaredType): Boolean =
53             declared.typeArguments.size == 1 && isRxJava2Publisher(declared)
54 
55     private fun isRxJava2Publisher(declared: DeclaredType): Boolean {
56         if (flowableTypeMirror == null) {
57             return false
58         }
59         val erasure = context.processingEnv.typeUtils.erasure(declared)
60         val match = context.processingEnv.typeUtils.isAssignable(flowableTypeMirror, erasure)
61         if (match && !hasRxJava2Artifact) {
62             context.logger.e(ProcessorErrors.MISSING_ROOM_RXJAVA2_ARTIFACT)
63         }
64         return match
65     }
66 }