}

    @Override
    public ConfigurableFileTree builtBy(Object... tasks) {
        buildDependency.add(tasks);
        return this;
    }

    @Override
    public Set<Object> getBuiltBy() {
        return buildDependency.getMutableValues();
    }

    @Override
    public ConfigurableFileTree setBuiltBy(Iterable<?> tasks) {
        buildDependency.setValues(tasks);
        return this;

    /**
     * Returns the set of tasks which build the files of this collection.
     *
     * @return The set. Returns an empty set when there are no such tasks.
     */
    Set<Object> getBuiltBy();

    /**
     * Sets the tasks which build the files of this collection.
     *
     * @param tasks The tasks. These are evaluated as per {@link org.gradle.api.Task#dependsOn(Object...)}.
     * @return this

    /**
     * Returns the set of tasks which build the files of this collection.
     *
     * @return The set. Returns an empty set when there are no such tasks.
     */
    Set<Object> getBuiltBy();

    /**
     * Sets the tasks which build the files of this collection.
     *
     * @param tasks The tasks. These are evaluated as per {@link org.gradle.api.Task#dependsOn(Object...)}.
     * @return this