TransportCancellationGenerator.kt
/*
* Copyright 2022 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.privacysandbox.tools.core.generator
import com.squareup.kotlinpoet.ClassName
import com.squareup.kotlinpoet.FileSpec
import com.squareup.kotlinpoet.FunSpec
import com.squareup.kotlinpoet.KModifier
import com.squareup.kotlinpoet.LambdaTypeName
import com.squareup.kotlinpoet.PropertySpec
import com.squareup.kotlinpoet.TypeSpec
import com.squareup.kotlinpoet.asTypeName
class TransportCancellationGenerator(private val basePackageName: String) {
companion object {
const val className = "TransportCancellationCallback"
}
private val atomicBooleanClass = ClassName("java.util.concurrent.atomic", "AtomicBoolean")
fun generate(): FileSpec {
val packageName = basePackageName
val cancellationSignalStubName =
ClassName(packageName, AidlGenerator.cancellationSignalName, "Stub")
val classSpec = TypeSpec.classBuilder(className).build {
superclass(cancellationSignalStubName)
addModifiers(KModifier.INTERNAL)
primaryConstructor(
listOf(
PropertySpec.builder(
"onCancel",
LambdaTypeName.get(returnType = Unit::class.asTypeName()),
).addModifiers(KModifier.PRIVATE).build()
), KModifier.INTERNAL
)
addProperty(
PropertySpec.builder(
"hasCancelled", atomicBooleanClass, KModifier.PRIVATE
).initializer("%T(false)", atomicBooleanClass).build()
)
addFunction(FunSpec.builder("cancel").build {
addModifiers(KModifier.PUBLIC, KModifier.OVERRIDE)
addCode {
addControlFlow("if (hasCancelled.compareAndSet(false, true))") {
addStatement("onCancel()")
}
}
})
}
return FileSpec.builder(packageName, className).addType(classSpec).build()
}
}