}

    protected TestFile file(String... path) {
        temporaryFolder.file(path)
    }

    protected def collectFingerprints(FingerprintingStrategy strategy) {
        Map<File, String> fingerprints = [:]
        strategy.collectFingerprints(roots).each { path, normalizedFingerprint ->
            String normalizedPath

     */
    Map<String, FileSystemLocationFingerprint> collectFingerprints(FileSystemSnapshot roots);

    /**
     * Used by the {@link FileCollectionFingerprint} to hash a map of fingerprints generated by {@link #collectFingerprints(FileSystemSnapshot)}
     */
    FingerprintHashingStrategy getHashingStrategy();

    String getIdentifier();

                }
                return false;
            }
        }

        Map<String, FileSystemLocationFingerprint> previousFingerprint = collectFingerprints(previous);
        Map<String, FileSystemLocationFingerprint> currentFingerprint = collectFingerprints(current);

        return NormalizedPathChangeDetector.INSTANCE.visitChangesSince(
            previousFingerprint,
            currentFingerprint,

    def "root broken symlink is ignored for #strategyName"() {
        given:
        def root = file('root')
        root.createLink(file('non-existing'))

        when:
        def fingerprints = strategy.collectFingerprints(snapshot(root))

        then:
        fingerprints.isEmpty()

        where:
        strategy << allFingerprintingStrategies
        strategyName = getStrategyName(strategy)
    }

    }

    private IgnoredPathFingerprintingStrategy() {
        this(FileSystemLocationSnapshotHasher.DEFAULT);
    }

    @Override
    public Map<String, FileSystemLocationFingerprint> collectFingerprints(FileSystemSnapshot roots) {
        ImmutableMap.Builder<String, FileSystemLocationFingerprint> builder = ImmutableMap.builder();
        roots.accept(new MissingRootAndDuplicateIgnoringFileSystemSnapshotVisitor() {

        this(directorySensitivity, FileSystemLocationSnapshotHasher.DEFAULT);
    }

    @Override
    public Map<String, FileSystemLocationFingerprint> collectFingerprints(FileSystemSnapshot roots) {
        ImmutableMap.Builder<String, FileSystemLocationFingerprint> builder = ImmutableMap.builder();
        roots.accept(new MissingRootAndDuplicateIgnoringFileSystemSnapshotVisitor() {

        this(stringInterner, directorySensitivity, FileSystemLocationSnapshotHasher.DEFAULT);
    }

    @Override
    public Map<String, FileSystemLocationFingerprint> collectFingerprints(FileSystemSnapshot roots) {
        ImmutableMap.Builder<String, FileSystemLocationFingerprint> builder = ImmutableMap.builder();
        HashSet<String> processedEntries = new HashSet<>();

        this(directorySensitivity, FileSystemLocationSnapshotHasher.DEFAULT);
    }

    @Override
    public Map<String, FileSystemLocationFingerprint> collectFingerprints(FileSystemSnapshot roots) {
        ImmutableMap.Builder<String, FileSystemLocationFingerprint> builder = ImmutableMap.builder();
        roots.accept(new MissingRootAndDuplicateIgnoringFileSystemSnapshotVisitor() {

            && equalRootHashes(candidate.getRootHashes(), rootHashes)
        ) {
            fingerprints = candidate.getFingerprints();
        } else {
            fingerprints = strategy.collectFingerprints(roots);
        }
        if (fingerprints.isEmpty()) {
            return strategy.getEmptyFingerprint();
        }
        return new DefaultCurrentFileCollectionFingerprint(fingerprints, roots, rootHashes, strategy);

        return new MetaInfAwareClasspathResourceHasher(delegate, manifestAttributeResourceEntryFilter);
    }

    @Override
    public Map<String, FileSystemLocationFingerprint> collectFingerprints(FileSystemSnapshot roots) {
        ImmutableMap.Builder<String, FileSystemLocationFingerprint> builder = ImmutableMap.builder();
        HashSet<String> processedEntries = new HashSet<>();