Package com.tomgibara.crinch.hashing

Interface Hash<T>

Type Parameters:
T - the type of objects for which hashes may be generated
All Known Implementing Classes:
PerfectStringHash
public interface Hash<T>

Implementations of this interface can generate one hash value for a given object. Depending upon the implementation, null values may be supported.

Author:
tomgibara

  • Method Details

    • getRange

      HashRange getRange()

    • hashAsBigInt

      BigInteger hashAsBigInt​(T value) throws IllegalArgumentException
      The hash value as a BigInteger. This method may be useful in circumstances where the generated hash is too large to be accomodated in a single primitive value, eg. if cryptographic hashes are being used.
      Parameters:
      value - the object to be hashed
      Returns:
      the object's hash code, never null
      Throws:
      IllegalArgumentException - if the value cannot be hashed

    • hashAsInt

      int hashAsInt​(T value) throws IllegalArgumentException
      The hash value as an int. This method should provide better performance for integer-ranged hashes. This value is not guaranteed to lie within the indicated HashRange.
      Parameters:
      value - the object to be hashed
      Returns:
      the object's hash code
      Throws:
      IllegalArgumentException - if the value cannot be hashed

    • hashAsLong

      long hashAsLong​(T value) throws IllegalArgumentException
      The hash value as a long. This method should provide better performance for long-ranged hashes. This value is not guaranteed to lie within the indicated HashRange.
      Parameters:
      value - the object to be hashed
      Returns:
      the object's hash code
      Throws:
      IllegalArgumentException - if the value cannot be hashed