buildSrc/src/main/kotlin/androidx/build/metalava/GenerateApiTask.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.build.metalava

import androidx.build.checkapi.ApiBaselinesLocation
import androidx.build.checkapi.ApiLocation
import androidx.build.java.JavaCompileInputs
import org.gradle.api.provider.Property
import org.gradle.api.tasks.Input
import org.gradle.api.tasks.InputFile
import org.gradle.api.tasks.Optional
import org.gradle.api.tasks.OutputFiles
import org.gradle.api.tasks.TaskAction
import org.gradle.workers.WorkerExecutor
import java.io.File
import javax.inject.Inject

/** Generate an API signature text file from a set of source files. */
abstract class GenerateApiTask @Inject constructor(
    workerExecutor: WorkerExecutor
) : MetalavaTask(workerExecutor) {
    /** Text file to which API signatures will be written. */
    @get:Input
    abstract val apiLocation: Property<ApiLocation>

    @get:Input
    abstract val baselines: Property<ApiBaselinesLocation>

    @get:Input
    var generateRestrictToLibraryGroupAPIs = true

    @Optional
    @InputFile
    fun getApiLintBaseline(): File? {
        val baseline = baselines.get().apiLintFile
        return if (baseline.exists()) baseline else null
    }

    @OutputFiles
    fun getTaskOutputs(): List<File>? {
        val prop = apiLocation.get()
        return listOfNotNull(
            prop.publicApiFile,
            prop.experimentalApiFile,
            prop.restrictedApiFile
        )
    }

    @TaskAction
    fun exec() {
        check(bootClasspath.isNotEmpty()) { "Android boot classpath not set." }
        check(sourcePaths.isNotEmpty()) { "Source paths not set." }

        val inputs = JavaCompileInputs.fromSourcesAndDeps(
            sourcePaths,
            dependencyClasspath,
            project
        )
        project.generateApi(
            inputs,
            apiLocation.get(),
            ApiLintMode.CheckBaseline(baselines.get().apiLintFile),
            generateRestrictToLibraryGroupAPIs,
            workerExecutor,
            manifestPath.orNull?.asFile?.absolutePath
        )
    }
}