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.T
import androidx.room.ext.findTypeElement
import androidx.room.ext.findTypeMirror
import androidx.room.ext.typeName
import androidx.room.parser.ParsedQuery
import androidx.room.processor.Context
import androidx.room.solver.RxType
import androidx.room.solver.prepared.binder.CallablePreparedQueryResultBinder.Companion.createPreparedBinder
import androidx.room.solver.prepared.binder.PreparedQueryResultBinder
import erasure
import isAssignableFrom
import javax.lang.model.type.DeclaredType
import javax.lang.model.type.TypeMirror
open class RxPreparedQueryResultBinderProvider internal constructor(
val context: Context,
private val rxType: RxType
) : PreparedQueryResultBinderProvider {
private val hasRxJavaArtifact by lazy {
context.processingEnv.findTypeElement(rxType.version.rxRoomClassName) != null
}
override fun matches(declared: DeclaredType): Boolean =
declared.typeArguments.size == 1 && matchesRxType(declared)
private fun matchesRxType(declared: DeclaredType): Boolean {
val erasure = declared.erasure(context.processingEnv.typeUtils)
return erasure.typeName() == rxType.className
}
override fun provide(declared: DeclaredType, query: ParsedQuery): PreparedQueryResultBinder {
if (!hasRxJavaArtifact) {
context.logger.e(rxType.version.missingArtifactMessage)
}
val typeArg = extractTypeArg(declared)
return createPreparedBinder(
returnType = typeArg,
adapter = context.typeAdapterStore.findPreparedQueryResultAdapter(typeArg, query)
) { callableImpl, _ ->
addStatement("return $T.fromCallable($L)", rxType.className, callableImpl)
}
}
open fun extractTypeArg(declared: DeclaredType): TypeMirror = declared.typeArguments.first()
companion object {
fun getAll(context: Context) = listOf(
RxPreparedQueryResultBinderProvider(context, RxType.RX2_SINGLE),
RxPreparedQueryResultBinderProvider(context, RxType.RX2_MAYBE),
RxCompletablePreparedQueryResultBinderProvider(context, RxType.RX2_COMPLETABLE),
RxPreparedQueryResultBinderProvider(context, RxType.RX3_SINGLE),
RxPreparedQueryResultBinderProvider(context, RxType.RX3_MAYBE),
RxCompletablePreparedQueryResultBinderProvider(context, RxType.RX3_COMPLETABLE)
)
}
}
private class RxCompletablePreparedQueryResultBinderProvider(
context: Context,
rxType: RxType
) : RxPreparedQueryResultBinderProvider(context, rxType) {
private val completableType: TypeMirror? by lazy {
context.processingEnv.findTypeMirror(rxType.className)
}
override fun matches(declared: DeclaredType): Boolean {
if (completableType == null) {
return false
}
val typeUtils = context.processingEnv.typeUtils
val erasure = declared.erasure(typeUtils)
return erasure.isAssignableFrom(typeUtils, completableType!!)
}
override fun extractTypeArg(declared: DeclaredType) = context.COMMON_TYPES.VOID
}