public FileType getType() {
        return FileType.Missing;
    }

    @Override
    public HashCode getHash() {
        return SIGNATURE;
    }

    @Override
    public boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other) {
        return isContentUpToDate(other);
    }

    @Override
    public boolean isContentUpToDate(FileSystemLocationSnapshot other) {

        return contentHash;
    }

    // Used by the Maven caching client. Do not remove
    public FileMetadata getMetadata() {
        return metadata;
    }

    @Override
    public boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other) {
        return isContentUpToDate(other) && metadata.equals(((RegularFileSnapshot) other).metadata);
    }

    @Override

     * </dl>
     */
    HashCode getHash();

    /**
     * Whether the content and the metadata (modification date) of the current snapshot is the same as for the given one.
     */
    boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other);

    /**
     * Whether the content of the current snapshot is the same as for the given one.
     */
    boolean isContentUpToDate(FileSystemLocationSnapshot other);

    public HashCode getHash() {
        return contentHash;
    }

    @Override
    public FileType getType() {
        return FileType.Directory;
    }

    @Override
    public boolean isContentAndMetadataUpToDate(FileSystemLocationSnapshot other) {
        return isContentUpToDate(other);
    }

    @Override
    public boolean isContentUpToDate(FileSystemLocationSnapshot other) {

        // Was it created during execution?
        if (beforeSnapshot == null) {
            return true;
        }
        // Was it updated during execution?
        if (!afterExecutionSnapshot.isContentAndMetadataUpToDate(beforeSnapshot)) {
            return true;
        }
        // Did we already consider it as an output after the previous execution?