SdkActivityLauncherWrapperGenerator.kt
/*
* Copyright 2023 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.model.Types
import com.squareup.kotlinpoet.ClassName
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
/**
* Used in server-side code generation to ensure that `SdkActivityLauncher`s are not repeatedly
* repackaged into binders.
*/
class SdkActivityLauncherWrapperGenerator(private val basePackageName: String) {
companion object {
const val className = "SdkActivityLauncherAndBinderWrapper"
}
fun generate(): FileSpec {
val classSpec = TypeSpec.classBuilder(className).build {
addSuperinterface(Types.sdkActivityLauncher.poetClassName(), CodeBlock.of("delegate"))
addModifiers(KModifier.PUBLIC)
primaryConstructor(
listOf(
PropertySpec.builder(
"delegate",
Types.sdkActivityLauncher.poetTypeName(),
).addModifiers(KModifier.PRIVATE).build(),
PropertySpec.builder(
"launcherInfo",
SpecNames.bundleClass,
).build(),
),
KModifier.PRIVATE,
)
addFunction(fromLauncherInfo())
addType(companionObject())
}
return FileSpec.builder(basePackageName, className).build {
addCommonSettings()
addType(classSpec)
}
}
private fun fromLauncherInfo() = FunSpec.constructorBuilder()
.addParameter("launcherInfo", SpecNames.bundleClass)
.callThisConstructor(
CodeBlock.of(
"%T.fromLauncherInfo(launcherInfo)",
ClassName(
"androidx.privacysandbox.ui.provider",
"SdkActivityLauncherFactory"
),
),
CodeBlock.of("launcherInfo"),
).build()
private fun companionObject() = TypeSpec.companionObjectBuilder().addFunction(
FunSpec.builder("getLauncherInfo").build {
addParameter("launcher", Types.sdkActivityLauncher.poetClassName())
returns(SpecNames.bundleClass)
addCode {
addControlFlow("if (launcher is %N)", className) {
addStatement("return launcher.launcherInfo")
}
addStatement(
"throw·IllegalStateException(%S)",
"Invalid SdkActivityLauncher instance cannot be bundled. " +
"SdkActivityLaunchers may only be created by apps."
)
}
}
).build()
}