HashFunction (Eclipse RDF4J 4.2.4)

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 Description

HashFunction()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	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, mustReturnDifferentResult

- 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