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

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