| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package androidx.room.solver.binderprovider |
| |
| import androidx.room.ext.PagingTypeNames |
| import androidx.room.ext.findTypeMirror |
| import androidx.room.ext.typeName |
| import androidx.room.parser.ParsedQuery |
| import androidx.room.processor.Context |
| import androidx.room.processor.ProcessorErrors |
| import androidx.room.solver.QueryResultBinderProvider |
| import androidx.room.solver.query.result.ListQueryResultAdapter |
| import androidx.room.solver.query.result.PagingSourceQueryResultBinder |
| import androidx.room.solver.query.result.PositionalDataSourceQueryResultBinder |
| import androidx.room.solver.query.result.QueryResultBinder |
| import com.squareup.javapoet.TypeName |
| import isAssignableFrom |
| import javax.lang.model.type.DeclaredType |
| import javax.lang.model.type.TypeMirror |
| |
| class PagingSourceQueryResultBinderProvider(val context: Context) : QueryResultBinderProvider { |
| private val pagingSourceTypeMirror: TypeMirror? by lazy { |
| context.processingEnv.findTypeMirror(PagingTypeNames.PAGING_SOURCE) |
| } |
| |
| override fun provide(declared: DeclaredType, query: ParsedQuery): QueryResultBinder { |
| if (query.tables.isEmpty()) { |
| context.logger.e(ProcessorErrors.OBSERVABLE_QUERY_NOTHING_TO_OBSERVE) |
| } |
| val typeArg = declared.typeArguments.last() |
| val listAdapter = context.typeAdapterStore.findRowAdapter(typeArg, query)?.let { |
| ListQueryResultAdapter(it) |
| } |
| val tableNames = ((listAdapter?.accessedTableNames() ?: emptyList()) + |
| query.tables.map { it.name }).toSet() |
| return PagingSourceQueryResultBinder( |
| PositionalDataSourceQueryResultBinder(listAdapter, tableNames) |
| ) |
| } |
| |
| override fun matches(declared: DeclaredType): Boolean { |
| if (pagingSourceTypeMirror == null) { |
| return false |
| } |
| |
| if (declared.typeArguments.isEmpty()) { |
| return false |
| } |
| |
| val typeUtils = context.processingEnv.typeUtils |
| val erasure = typeUtils.erasure(declared) |
| if (!pagingSourceTypeMirror!!.isAssignableFrom(typeUtils, erasure)) { |
| return false |
| } |
| |
| if (declared.typeArguments.first().typeName() != TypeName.INT.box()) { |
| context.logger.e(ProcessorErrors.PAGING_SPECIFY_PAGING_SOURCE_TYPE) |
| } |
| |
| return true |
| } |
| } |