ValueConverterFileGenerator.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 androidx.privacysandbox.tools.core.generator.GenerationTarget.SERVER
import androidx.privacysandbox.tools.core.generator.SpecNames.contextClass
import androidx.privacysandbox.tools.core.generator.SpecNames.contextPropertyName
import androidx.privacysandbox.tools.core.model.AnnotatedValue
import androidx.privacysandbox.tools.core.model.ValueProperty
import com.squareup.kotlinpoet.CodeBlock
import com.squareup.kotlinpoet.FileSpec
import com.squareup.kotlinpoet.FunSpec
import com.squareup.kotlinpoet.KModifier
import com.squareup.kotlinpoet.PropertySpec
import com.squareup.kotlinpoet.TypeSpec
import com.squareup.kotlinpoet.joinToCode
/**
* Generates a file that defines a converter for an SDK defined value and its AIDL parcelable
* counterpart.
*/
class ValueConverterFileGenerator(
private val binderConverter: BinderCodeConverter,
private val target: GenerationTarget,
) {
companion object {
const val toParcelableMethodName = "toParcelable"
const val fromParcelableMethodName = "fromParcelable"
}
fun generate(value: AnnotatedValue) =
FileSpec.builder(
value.converterNameSpec().packageName,
value.converterNameSpec().simpleName
).build {
addCommonSettings()
addType(generateConverter(value))
}
private fun generateConverter(value: AnnotatedValue): TypeSpec {
if (target == SERVER) {
return TypeSpec.classBuilder(value.converterNameSpec()).build {
primaryConstructor(
listOf(
PropertySpec.builder(contextPropertyName, contextClass)
.addModifiers(KModifier.PUBLIC).build()
)
)
addFunction(generateFromParcelable(value))
addFunction(generateToParcelable(value))
}
}
return TypeSpec.objectBuilder(value.converterNameSpec()).build() {
addFunction(generateFromParcelable(value))
addFunction(generateToParcelable(value))
}
}
private fun generateToParcelable(value: AnnotatedValue) =
FunSpec.builder(toParcelableMethodName).build {
addParameter("annotatedValue", value.type.poetTypeName())
returns(value.parcelableNameSpec())
addStatement("val parcelable = %T()", value.parcelableNameSpec())
value.properties.map(::generateToParcelablePropertyConversion).forEach(::addCode)
addStatement("return parcelable")
}
private fun generateToParcelablePropertyConversion(property: ValueProperty) =
CodeBlock.builder().build {
addStatement(
"parcelable.${property.name} = %L",
binderConverter.convertToBinderCode(
property.type,
"annotatedValue.${property.name}"
)
)
}
private fun generateFromParcelable(value: AnnotatedValue) =
FunSpec.builder(fromParcelableMethodName).build {
addParameter("parcelable", value.parcelableNameSpec())
returns(value.type.poetTypeName())
val parameters = value.properties.map(::generateFromParcelablePropertyConversion)
addStatement {
add("val annotatedValue = %T(\n", value.type.poetTypeName())
add(parameters.joinToCode(separator = ",\n"))
add(")")
}
addStatement("return annotatedValue")
}
private fun generateFromParcelablePropertyConversion(property: ValueProperty) =
CodeBlock.builder().build {
add(
"${property.name} = %L",
binderConverter.convertToModelCode(
property.type, "parcelable.${property.name}"
)
)
}
}