}

    public Set<Throwable> getFailures() {
        return failures;
    }

    @Override
    public FileCollectionStructureVisitor.VisitType prepareForVisit(FileCollectionInternal.Source source) {
        return visitor.prepareForVisit(source);
    }

    @Override
    public void visitFile(File file) {
        files.add(file);
    }

    @Override

                this.visitor = visitor;
            }

            @Override
            public FileCollectionStructureVisitor.VisitType prepareForVisit(FileCollectionInternal.Source source) {
                return visitor.prepareForVisit(source);
            }

            @Override
            public void visitArtifacts(ResolvedArtifactSet.Artifacts artifacts) {

        this.visitor = visitor;
    }

    @Override
    public FileCollectionStructureVisitor.VisitType prepareForVisit(FileCollectionInternal.Source source) {
        return visitor.prepareForVisit(source);
    }

    public void visitFile(File file) {
        visitor.visitFile(file);
    }

    @Override

        def listener = Mock(ResolvedArtifactSet.Visitor)
        def artifactVisitor = Mock(ArtifactVisitor)

        when:
        set.visit(listener)

        then:
        1 * listener.prepareForVisit(_) >> FileCollectionStructureVisitor.VisitType.NoContents
        1 * listener.visitArtifacts(_) >> { ResolvedArtifactSet.Artifacts artifacts -> artifacts.visit(artifactVisitor) }
        1 * artifactVisitor.endVisitCollection(_)

     *
     * <p>When the file collection contains some other source of files then {@link #prepareForVisit(FileCollectionInternal.Source)} is called for each source in order.
     */
    default boolean startVisit(FileCollectionInternal.Source source, FileCollectionInternal fileCollection) {
        return true;
    }

public interface ResolvedFileVisitor {
    /**
     * Called prior to scheduling resolution of a set of artifacts. Should be called in result order.
     */
    default FileCollectionStructureVisitor.VisitType prepareForVisit(FileCollectionInternal.Source source) {
        return FileCollectionStructureVisitor.VisitType.Visit;
    }

    /**
     * Visits an artifact file.
     *

 */
public interface ArtifactVisitor {
    /**
     * Called prior to scheduling resolution of a set of artifacts. Should be called in result order.
     */
    default FileCollectionStructureVisitor.VisitType prepareForVisit(FileCollectionInternal.Source source) {
        return FileCollectionStructureVisitor.VisitType.Visit;
    }

    /**

        if (failures == null) {
            failures = new ArrayList<>();
        }
        failures.add(failure);
    }

    @Override
    public FileCollectionStructureVisitor.VisitType prepareForVisit(FileCollectionInternal.Source source) {
        if (source instanceof LocalDependencyFiles) {
            return FileCollectionStructureVisitor.VisitType.NoContents;
        }

                        // Nothing to do
                    }

                    @Override
                    public void visit(ArtifactVisitor visitor) {
                        if (visitor.prepareForVisit(FileCollectionInternal.OTHER) == FileCollectionStructureVisitor.VisitType.Visit) {
                            visitor.visitArtifact(variantDisplayName, variantAttributes, capabilities, new ResolvableArtifact() {

                nestedVisitor.addElements(elements)
                false
            }

            else -> {
                true
            }
        }

    override fun prepareForVisit(source: FileCollectionInternal.Source): FileCollectionStructureVisitor.VisitType =
        if (source is TransformedArtifactSet) {
            // Should only be contained in a ResolutionBackedFileCollection