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.parser.ParsedQuery 20 import androidx.room.processor.Context 21 import androidx.room.processor.ProcessorErrors 22 import androidx.room.solver.query.result.QueryResultAdapter 23 import androidx.room.solver.query.result.QueryResultBinder 24 import javax.lang.model.type.DeclaredType 25 import javax.lang.model.type.TypeMirror 26 27 /** 28 * Binder provider class that has common functionality for observables. 29 */ 30 abstract class ObservableQueryResultBinderProvider(val context: Context) 31 : QueryResultBinderProvider { extractTypeArgnull32 protected abstract fun extractTypeArg(declared: DeclaredType): TypeMirror 33 protected abstract fun create(typeArg: TypeMirror, 34 resultAdapter: QueryResultAdapter?, 35 tableNames: Set<String>): QueryResultBinder 36 37 final override fun provide(declared: DeclaredType, query: ParsedQuery): QueryResultBinder { 38 val typeArg = extractTypeArg(declared) 39 val adapter = context.typeAdapterStore.findQueryResultAdapter(typeArg, query) 40 val tableNames = ((adapter?.accessedTableNames() ?: emptyList()) + 41 query.tables.map { it.name }).toSet() 42 if (tableNames.isEmpty()) { 43 context.logger.e(ProcessorErrors.OBSERVABLE_QUERY_NOTHING_TO_OBSERVE) 44 } 45 return create( 46 typeArg = typeArg, 47 resultAdapter = adapter, 48 tableNames = tableNames 49 ) 50 } 51 }