org.eclipse.rdf4j.query.algebra.evaluation.function.hash

## Class HashFunction

- java.lang.Object
- - org.eclipse.rdf4j.query.algebra.evaluation.function.hash.HashFunction

- All Implemented Interfaces:
    Function
  Direct Known Subclasses:
    MD5, SHA1, SHA256, SHA384, SHA512

      public abstract class HashFunction
      extends Object
      implements Function

  Abstract hash function
  Author:
    jeen

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `HashFunction()`

  - ### Method Summary

    All Methods Instance Methods Abstract Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `abstract Literal` | `evaluate(ValueFactory valueFactory, Value... args)` Evaluate the function over the supplied input arguments, using the supplied `ValueFactory` to produce the result.
    `protected String` | `hash(String text, String algorithm)` Calculate hash value, represented as hexadecimal string.

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface org.eclipse.rdf4j.query.algebra.evaluation.function.Function

      `evaluate, getURI`

- - ### Constructor Detail

    - #### HashFunction

          public HashFunction()

  - ### Method Detail

    - #### hash

          protected String hash(String text,
                                String algorithm)
                         throws NoSuchAlgorithmException

      Calculate hash value, represented as hexadecimal string.
      Parameters:
        `text` - text
        `algorithm` - name of the hash algorithm
      Returns:
        hexadecimal string (padded with leading zeros if needed)
      Throws:
        `NoSuchAlgorithmException`

    - #### evaluate

          public abstract Literal evaluate(ValueFactory valueFactory,
                                           Value... args)
                                    throws ValueExprEvaluationException

      Description copied from interface: `Function`
      Evaluate the function over the supplied input arguments, using the supplied `ValueFactory` to produce the result.
      Specified by:
        `evaluate` in interface `Function`
      Parameters:
        `valueFactory` - a `ValueFactory` to use for producing the function result.
        `args` - the function input arguments.
      Returns:
        the function result value.
      Throws:
        `ValueExprEvaluationException`

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