Class MappingHasher

java.lang.Object
org.incenp.obofoundry.sssom.MappingHasher
public class MappingHasher extends Object
Creates deterministic hash values from mappings.

  • Constructor Summary

    Constructors
    Constructor
    Description
    MappingHasher()
    Creates a new instance that will produce the standard hash defined by the SSSOM specification.
    MappingHasher(HashType type)
    Creates a new instance that will produce the requested type of hash.

  • Method Summary

    Modifier and Type
    Method
    Description
    static byte[]
    fnv64(byte[] input)
    Generates a FNV64 hash.
    String
    hash(Mapping mapping)
    Hashes the given mapping.
    static String
    toHexadecimal(byte[] digest)
    Encodes a buffer into its hexadecimal representation.
    static String
    toHexadecimal(byte[] digest, boolean lower)
    Encodes a buffer into its hexadecimal representation, optional in lowercase.
    static String
    toZBase32(byte[] digest)
    Encodes a buffer into its Z-Base32 string representation.

    Methods inherited from class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • 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 Details

    • 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.