FileCollection files

                Iterator<File> iterator() {
                    files.iterator()
                }

                TaskDependency getBuildDependencies() {
                    files.getBuildDependencies()
                }
            }

            task foo {
                outputs.file "foo.txt"
                doFirst {}
            }

            task bar {

                    classpathElements.getBuildDependencies().add(projectDependency.getBuildDependencies());
                } else {

        mainSourceSet.java.destinationDirectory.set(new File(project.buildDir, 'classes/java/main'))
        mainSourceSet.output.resourcesDir == new File(project.buildDir, 'resources/main')
        mainSourceSet.getOutput().getBuildDependencies().getDependencies(null)*.name as Set == [ JvmConstants.CLASSES_TASK_NAME, JvmConstants.COMPILE_JAVA_TASK_NAME ] as Set

        return signatureSpec;
    }

    @Internal
    Buildable getSource() {
        return source;
    }

    @Internal
    @Override
    public TaskDependency getBuildDependencies() {
        return super.getBuildDependencies();
    }

    @Override
    public boolean shouldBePublished() {
        return true;
    }

    /**
     * Generates the signature file.
     *

                    base.getName(),
                    "asc",
                    base.getExtension() + ".asc"
                );
            }

            @Override
            public TaskDependency getBuildDependencies() {
                return new DefaultTaskDependency();
            }
        }
    }

    }

    // This is final - override {@link TaskDependencyContainer#visitDependencies} to provide the dependencies instead.
    @Override
    public final TaskDependency getBuildDependencies() {
        assertCanCarryBuildDependencies();
        DefaultTaskDependency result = taskDependencyFactory.visitingDependencies(context -> context.add(AbstractFileCollection.this));