/** List of files to concatenate */
    private FileTree files;

    /** line to add at the top of the target file */
    private String headerLine;

    private File target;

    private List<String> additionalLines = new ArrayList<>();

    public void setFiles(FileTree files) {
        this.files = files;
    }

    @InputFiles
    public FileTree getFiles() {
        return files;
    }

    private boolean skipHasRestTestCheck;
    private FileCollection config;
    private FileCollection additionalConfig;
    private Function<FileCollection, FileTree> configToFileTree = FileCollection::getAsFileTree;
    private Function<FileCollection, FileTree> additionalConfigToFileTree = FileCollection::getAsFileTree;

    private final PatternFilterable patternSet;
    private final ProjectLayout projectLayout;

    }

    @InputFiles
    @Optional
    public FileCollection getNoticeFiles() {
        FileTree tree = null;
        for (File dir : licensesDirs) {
            if (tree == null) {
                tree = getProject().fileTree(dir);
            } else {
                tree = tree.plus(getProject().fileTree(dir));
            }
        }

import org.gradle.api.DefaultTask;
import org.gradle.api.GradleException;
import org.gradle.api.InvalidUserDataException;
import org.gradle.api.file.FileCollection;
import org.gradle.api.file.FileTree;
import org.gradle.api.file.ProjectLayout;
import org.gradle.api.provider.ListProperty;
import org.gradle.api.provider.Property;
import org.gradle.api.provider.Provider;
import org.gradle.api.tasks.Input;

import org.elasticsearch.gradle.internal.precommit.ValidateYamlAgainstSchemaTask;
import org.gradle.api.Plugin;
import org.gradle.api.Project;
import org.gradle.api.file.Directory;
import org.gradle.api.file.FileTree;
import org.gradle.api.file.ProjectLayout;
import org.gradle.api.provider.Provider;
import org.gradle.api.tasks.TaskProvider;
import org.gradle.api.tasks.util.PatternSet;

import java.io.File;

import org.gradle.api.file.ArchiveOperations
import org.gradle.api.file.ConfigurableFileCollection
import org.gradle.api.file.DirectoryProperty
import org.gradle.api.file.FileSystemOperations
import org.gradle.api.file.FileTree
import org.gradle.api.file.FileVisitDetails
import org.gradle.api.file.RegularFileProperty
import org.gradle.api.logging.LogLevel
import org.gradle.api.model.ObjectFactory
import org.gradle.api.tasks.CacheableTask

        });

        extension.dslReference(dslRef -> {
            // DSL ref has custom javascript
            ConfigurableFileTree js = objects.fileTree();
            js.from(dslReference.getRoot());
            js.include("*.js");
            dslRef.getResources().from(js);

            dslRef.getResources().from(extension.getCssFiles());

        extension.getStagingRoot().convention(layout.getBuildDirectory().dir("working"));

        ConfigurableFileTree css = objects.fileTree();
        css.from(extension.getSourceRoot().dir("css"));
        css.include("*.css");
        extension.getCssFiles().from(css);

        extension.getRenderedDocumentation().from(stageDocs);