import org.gradle.api.file.DirectoryProperty;
import org.gradle.api.file.FileCollection;
import org.gradle.api.tasks.CacheableTask;
import org.gradle.api.tasks.IgnoreEmptyDirectories;
import org.gradle.api.tasks.InputFiles;
import org.gradle.api.tasks.Internal;
import org.gradle.api.tasks.OutputDirectory;
import org.gradle.api.tasks.PathSensitive;
import org.gradle.api.tasks.PathSensitivity;
import org.gradle.api.tasks.SkipWhenEmpty;

// tag::all[]
// tag::task[]
abstract class GreetingFileTask extends DefaultTask {

    @InputFiles
    abstract RegularFileProperty getSource()

    @OutputFile
    abstract RegularFileProperty getDestination()

    @TaskAction
    def greet() {
        def file = getDestination().get().asFile
        if (source.get().asFile.exists()) {
            file.write("Hello ${source.get().asFile.text}!")
        } else {

        // Documentation
        failureDescriptionContains(documentationRegistry.getDocumentationRecommendationFor("information", "validation_problems", "unsupported_value_type"))

        where:
        annotation    | _
        "@Input"      | _
        "@InputFile"  | _
        "@InputFiles" | _
    }

    def "can use #type as task input"() {

                    generatedBy tasks.idl
                }
                c.lib sources.idlOutput
            }
        }
    }
}


class DummyIdlCompiler extends DefaultTask {
    @InputFiles FileCollection idlFiles
    @OutputDirectory File headerDir
    @OutputDirectory File sourceDir

    @TaskAction
    void processIdlFiles() {
        idlFiles.each { File idlFile ->

import org.gradle.api.tasks.*;

public abstract class Instrument extends DefaultTask {

    @SkipWhenEmpty
    @IgnoreEmptyDirectories
    @PathSensitive(PathSensitivity.RELATIVE)
    @InputFiles
    public abstract ConfigurableFileCollection getClassFiles();

    @OutputDirectory
    public abstract DirectoryProperty getDestinationDir();

    @Inject
    protected abstract FileSystemOperations getFs();

                @Optional
                @InputFile
                File inputFile

                @OutputFile
                File outputFile

                @TaskAction
                void doAction() {
                    if (inputFile != null) {
                        outputFile.text = inputFile.text
                    }
                }
            }

import org.gradle.process.JavaForkOptions;
import org.gradle.workers.*;

import javax.inject.Inject;
import java.io.File;
import java.util.Set;

abstract public class CreateMD5 extends SourceTask {

    @InputFiles
    abstract public ConfigurableFileCollection getCodecClasspath(); // <1>

    @OutputDirectory
    abstract public DirectoryProperty getDestinationDirectory();

    @Inject

import org.gradle.process.JavaForkOptions;
import org.gradle.workers.*;

import javax.inject.Inject;
import java.io.File;
import java.util.Set;

abstract public class CreateMD5 extends SourceTask {

    @InputFiles
    abstract public ConfigurableFileCollection getCodecClasspath(); // <1>

    @OutputDirectory
    abstract public DirectoryProperty getDestinationDirectory();

    @Inject

            import org.gradle.api.file.*
            import org.gradle.api.tasks.*

            class TaskWithTwoFileCollectionInputs extends DefaultTask {
                @InputFiles FileCollection inputs1
                @InputFiles FileCollection inputs2

                @OutputDirectory File output = project.buildDir

                @TaskAction void action() {}
            }
        """

import org.gradle.process.JavaForkOptions;
import org.gradle.workers.*;

import javax.inject.Inject;
import java.io.File;
import java.util.Set;

abstract public class CreateMD5 extends SourceTask {

    @InputFiles
    abstract public ConfigurableFileCollection getCodecClasspath(); // <1>

    @OutputDirectory
    abstract public DirectoryProperty getDestinationDirectory();

    @Inject