@Override
            boolean acceptChildren(Supplier<String> relativePathSupplier) {
                String relativePathFromLocation = relativePathSupplier.get();
                return matcher.elementWithRelativePathMatches(filter, new File(location, relativePathFromLocation), relativePathFromLocation);
            }
        });
    }

    /**
     * Records that a node accesses the given locations.
     */

            this.spec = spec;
        }

        @Override
        public boolean contains(VfsRelativePath childPath) {
            return matcher.elementWithRelativePathMatches(spec, new File(childPath.getAbsolutePath()), childPath.getAsString());
        }
    }

public class SingleFileTreeElementMatcher {

    private final Stat stat;

    public SingleFileTreeElementMatcher(Stat stat) {
        this.stat = stat;
    }

    public boolean elementWithRelativePathMatches(Spec<FileTreeElement> filter, File element, String relativePathString) {
        // A better solution for output files would be to record the type of the output file and then using this type here instead of looking at the disk.