InAndOutDirectoryOperationRequest

The Artifact identifying the artifact to transform. The Artifact's Artifact.kind must be Artifact.DIRECTORY

The artifact type must be Artifact.Single and Artifact.Transformable.

Let's take a Task transforming an input org.gradle.api.file.Directory into an output:

    abstract class MyTask: DefaultTask() {
         @get:InputFiles abstract val inputDir: DirectoryProperty
         @get:OutputDirectory abstract val outputDir: DirectoryProperty

         @TaskAction fun taskAction() {
             ... read inputFile and write outputFile ...
         }
    }

An ArtifactType defined as follows :

    sealed class ArtifactType<T: FileSystemLocation>(val kind: ArtifactKind) {
         object SINGLE_DIR_ARTIFACT:
                 ArtifactType<Directory>(DIRECTORY), Single, Transformable
    }

You can register a transform to the collection of org.gradle.api.file.RegularFile.

    val taskProvider= projects.tasks.register(MyTask::class.java, "transformTask")
    artifacts.use(taskProvider)
     .wiredWithDirectories(
         MyTask::inputFile,
         MyTask::outputFile)
     .toTransform(ArtifactType.SINGLE_DIR_ARTIFACT)

ArtifactTransformationRequest that will allow processing of individual artifacts located in the input directory.

The artifact type must be Artifact.Single, Artifact.Transformable, and Artifact.ContainsMany.

For example, let's take a Task to transform a list of org.gradle.api.file.RegularFile as inputs into a single output:

    abstract class MyTask: DefaultTask() {
         @get:InputFiles abstract val inputFolder: DirectoryProperty
         @get:OutputFile abstract val outputFolder: DirectoryProperty
         @Internal abstract Property<ArtifactTransformationRequest<MyTask>> getTransformationRequest()

         @TaskAction fun taskAction() {
            transformationRequest.get().submit(
                 ... submit a work item for each input file ...
            )
         }
    }

You then register the task as follows:

    val taskProvider= projects.tasks.register(MyTask::class.java, "combineTask")
    val transformationRequest = artifacts.use(taskProvider)
      .wiredWith(
         MyTask::inputFolder,
         MyTask::outputFolder)
      .toTransformMany(ArtifactType.APK)
    taskProvider.configure { task ->
         task.getTransformationRequest().set(transformationRequest)
    }