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
18 
19 import androidx.room.compiler.processing.XType
20 import androidx.room.parser.ParsedQuery
21 import androidx.room.processor.Context
22 import androidx.room.processor.ProcessorErrors
23 import androidx.room.solver.query.result.QueryResultAdapter
24 import androidx.room.solver.query.result.QueryResultBinder
25 
26 /** Binder provider class that has common functionality for observables. */
27 abstract class ObservableQueryResultBinderProvider(val context: Context) :
28     QueryResultBinderProvider {
extractTypeArgnull29     protected abstract fun extractTypeArg(declared: XType): XType
30 
31     protected abstract fun create(
32         typeArg: XType,
33         resultAdapter: QueryResultAdapter?,
34         tableNames: Set<String>
35     ): QueryResultBinder
36 
37     final override fun provide(
38         declared: XType,
39         query: ParsedQuery,
40         extras: TypeAdapterExtras
41     ): QueryResultBinder {
42         extras.putData(OriginalTypeArg::class, OriginalTypeArg(declared))
43         val typeArg = extractTypeArg(declared)
44         val adapter = context.typeAdapterStore.findQueryResultAdapter(typeArg, query, extras)
45         val tableNames =
46             ((adapter?.accessedTableNames() ?: emptyList()) + query.tables.map { it.name }).toSet()
47         if (tableNames.isEmpty()) {
48             context.logger.e(ProcessorErrors.OBSERVABLE_QUERY_NOTHING_TO_OBSERVE)
49         }
50         return create(typeArg = typeArg, resultAdapter = adapter, tableNames = tableNames)
51     }
52 
53     data class OriginalTypeArg(val original: XType)
54 }
55