RxPreparedQueryResultBinderProvider.kt
/*
* Copyright 2018 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.prepared.binderprovider
import androidx.room.ext.L
import androidx.room.ext.RoomRxJava2TypeNames
import androidx.room.ext.RxJava2TypeNames
import androidx.room.ext.T
import androidx.room.ext.typeName
import androidx.room.parser.ParsedQuery
import androidx.room.processor.Context
import androidx.room.processor.ProcessorErrors
import androidx.room.solver.prepared.binder.CallablePreparedQueryResultBinder.Companion.createPreparedBinder
import androidx.room.solver.prepared.binder.PreparedQueryResultBinder
import com.squareup.javapoet.ClassName
import javax.lang.model.type.DeclaredType
import javax.lang.model.type.TypeMirror
sealed class RxPreparedQueryResultBinderProvider(
val context: Context,
val rxType: RxType
) : PreparedQueryResultBinderProvider {
private val hasRxJava2Artifact by lazy {
context.processingEnv.elementUtils
.getTypeElement(RoomRxJava2TypeNames.RX_ROOM.toString()) != null
}
override fun matches(declared: DeclaredType): Boolean =
declared.typeArguments.size == 1 && matchesRxType(declared)
private fun matchesRxType(declared: DeclaredType): Boolean {
val erasure = context.processingEnv.typeUtils.erasure(declared)
return erasure.typeName() == rxType.className
}
override fun provide(declared: DeclaredType, query: ParsedQuery): PreparedQueryResultBinder {
if (!hasRxJava2Artifact) {
context.logger.e(ProcessorErrors.MISSING_ROOM_RXJAVA2_ARTIFACT)
}
val typeArg = extractTypeArg(declared)
return createPreparedBinder(
returnType = typeArg,
adapter = context.typeAdapterStore.findPreparedQueryResultAdapter(typeArg, query)
) { callableImpl, _ ->
addStatement("return $T.fromCallable($L)", rxType.className, callableImpl)
}
}
abstract fun extractTypeArg(declared: DeclaredType): TypeMirror
enum class RxType(val className: ClassName) {
SINGLE(RxJava2TypeNames.SINGLE),
MAYBE(RxJava2TypeNames.MAYBE),
COMPLETABLE(RxJava2TypeNames.COMPLETABLE)
}
}
class RxSinglePreparedQueryResultBinderProvider(context: Context) :
RxPreparedQueryResultBinderProvider(context, RxType.SINGLE) {
override fun extractTypeArg(declared: DeclaredType): TypeMirror = declared.typeArguments.first()
}
class RxMaybePreparedQueryResultBinderProvider(context: Context) :
RxPreparedQueryResultBinderProvider(context, RxType.MAYBE) {
override fun extractTypeArg(declared: DeclaredType): TypeMirror = declared.typeArguments.first()
}
class RxCompletablePreparedQueryResultBinderProvider(context: Context) :
RxPreparedQueryResultBinderProvider(context, RxType.COMPLETABLE) {
private val completableType: TypeMirror? by lazy {
context.processingEnv.elementUtils
.getTypeElement(RxJava2TypeNames.COMPLETABLE.toString())?.asType()
}
override fun matches(declared: DeclaredType): Boolean {
if (completableType == null) {
return false
}
val erasure = context.processingEnv.typeUtils.erasure(declared)
return context.processingEnv.typeUtils.isAssignable(completableType, erasure)
}
override fun extractTypeArg(declared: DeclaredType) = context.COMMON_TYPES.VOID
}