formatter.node("backing collection");
        formatter.startChildren();
        collection.describeContents(formatter);
        formatter.endChildren();
    }

    public AbstractFileCollection getCollection() {
        return collection;
    }

    @Override
    public FileTreeInternal matching(PatternFilterable patterns) {
        return new FilteredFileTree(this, taskDependencyFactory, patternSetFactory, () -> {

        if (newCollection == collection) {
            return this;
        }
        return newCollection.filter(filterSpec);
    }

    public FileCollectionInternal getCollection() {
        return collection;
    }

    public Spec<? super File> getFilterSpec() {
        return filterSpec;
    }

    @Override
    public String getDisplayName() {