InstantTransactionMethodBinder.kt
/*
* Copyright 2019 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.transaction.binder
import androidx.room.compiler.codegen.CodeLanguage
import androidx.room.compiler.codegen.XClassName
import androidx.room.compiler.codegen.XCodeBlock
import androidx.room.compiler.codegen.XMemberName.Companion.packageMember
import androidx.room.compiler.codegen.XPropertySpec
import androidx.room.compiler.codegen.box
import androidx.room.compiler.processing.XType
import androidx.room.compiler.processing.isKotlinUnit
import androidx.room.compiler.processing.isVoid
import androidx.room.ext.InvokeWithLambdaParameter
import androidx.room.ext.KotlinTypeNames
import androidx.room.ext.LambdaSpec
import androidx.room.ext.RoomTypeNames
import androidx.room.ext.SQLiteDriverTypeNames
import androidx.room.solver.CodeGenScope
import androidx.room.solver.transaction.result.TransactionMethodAdapter
/**
* Binder that knows how to write instant (blocking) transaction wrapper methods.
*/
class InstantTransactionMethodBinder(
private val returnType: XType,
adapter: TransactionMethodAdapter,
) : TransactionMethodBinder(adapter) {
override fun executeAndReturn(
parameterNames: List<String>,
daoName: XClassName,
daoImplName: XClassName,
dbProperty: XPropertySpec,
scope: CodeGenScope
) {
val returnPrefix = when (scope.language) {
CodeLanguage.JAVA ->
if (returnType.isVoid() || returnType.isKotlinUnit()) "" else "return "
CodeLanguage.KOTLIN -> "return "
}
val performBlock = InvokeWithLambdaParameter(
scope = scope,
functionName = RoomTypeNames.DB_UTIL.packageMember("performBlocking"),
argFormat = listOf("%N", "%L", "%L"),
args = listOf(dbProperty, /* isReadOnly = */ false, /* inTransaction = */ true),
lambdaSpec = object : LambdaSpec(
parameterTypeName = SQLiteDriverTypeNames.CONNECTION,
parameterName = when (scope.language) {
CodeLanguage.JAVA -> scope.getTmpVar("_connection")
CodeLanguage.KOTLIN -> "_"
},
returnTypeName = returnType.asTypeName().box(),
javaLambdaSyntaxAvailable = scope.javaLambdaSyntaxAvailable
) {
override fun XCodeBlock.Builder.body(scope: CodeGenScope) {
val adapterScope = scope.fork()
adapter.createDelegateToSuperCode(
parameterNames = parameterNames,
daoName = daoName,
daoImplName = daoImplName,
scope = adapterScope
)
when (scope.language) {
CodeLanguage.JAVA -> {
addStatement("$returnPrefix%L", adapterScope.generate())
if (returnPrefix.isEmpty()) {
addStatement("return %T.INSTANCE", KotlinTypeNames.UNIT)
}
}
CodeLanguage.KOTLIN -> {
addStatement("%L", adapterScope.generate())
}
}
}
}
)
scope.builder.add("$returnPrefix%L", performBlock)
}
}