Package org.incenp.obofoundry.sssom

Class MappingHasher

  • public class MappingHasher
extends Object
    Creates deterministic hash values from mappings.

    • Constructor Detail

      • MappingHasher

        public MappingHasher()
        Creates a new instance that will produce the standard hash defined by the SSSOM specification.

      • MappingHasher

        public MappingHasher​(HashType type)
        Creates a new instance that will produce the requested type of hash.
        Parameters:
        type - The type of hash to produce.

    • Method Detail

      • hash

        public String hash​(Mapping mapping)
        Hashes the given mapping.
        Parameters:
        mapping - The mapping to hash.
        Returns:
        The unique hash for the mapping.

      • fnv64

        public static byte[] fnv64​(byte[] input)
        Generates a FNV64 hash.

        This method implements the 64-bit variant of the FNV-1a hash function as defined in RFC 9923.

        Parameters:
        input - The data to hash.
        Returns:
        The resulting hash value, as an array of bytes in little endian order.

      • toZBase32

        public static String toZBase32​(byte[] digest)
        Encodes a buffer into its Z-Base32 string representation.

        This method implements the Z-Base32 encoding as defined in RFC 6189 ยง5.1.6 and human-oriented base32 encoding.

        Parameters:
        digest - The input buffer to encode.
        Returns:
        The Z-Base32-encoded string representation of the input buffer.

      • toHexadecimal

        public static String toHexadecimal​(byte[] digest)
        Encodes a buffer into its hexadecimal representation.

        This method implements the Base16 encoding as defined in RFC 4648.

        Parameters:
        digest - The input buffer to encode.
        Returns:
        The hexadecimal representation of the input buffer.

      • toHexadecimal

        public static String toHexadecimal​(byte[] digest,
                                   boolean lower)
        Encodes a buffer into its hexadecimal representation, optional in lowercase.
        Parameters:
        digest - The input buffer to encode.
        lower - If true, lowercase characters are used.
        Returns:
        The hexadecimal representation of the input buffer.