de.fuberlin.wiwiss.wiqa
Class ExplainableFunction

java.lang.Object
  com.hp.hpl.jena.query.function.FunctionBase
      de.fuberlin.wiwiss.wiqa.ExplainableFunction

All Implemented Interfaces:

Function

Direct Known Subclasses:

MorePositiveRatings, TidalTrust

public abstract class ExplainableFunction

extends FunctionBase

Abstract base class for ARQ functions that can generate explanations.

In fact, any class implementing Function can return explanations. This class merely provides a convenience method returnExplanation(de.fuberlin.wiwiss.wiqa.ExplanationPart) to simplify the process.

Functions produce an RDF node from a number of input RDF nodes. Function instances are generated once at query parse time and then reused. A function can return an explanation for every invocation.

Version:

$Id: ExplainableFunction.java,v 1.4 2006/06/14 14:27:55 cyganiak Exp $

Author:

Richard Cyganiak (richard@cyganiak.de)

Constructor Summary

ExplainableFunction()

Method Summary

void	build(String uri, List args) Provide a default implementation of build that does nothing.
DatasetGraph	getDataset() Provides the function with access to the unfiltered dataset.
void	returnExplanation(ExplanationPart explanation) Returns an explanation.

Methods inherited from class com.hp.hpl.jena.query.function.FunctionBase

exec, exec, getArg, getContext, getCurrentBinding

Methods inherited from class java.lang.Object

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

Constructor Detail

ExplainableFunction

public ExplainableFunction()

Method Detail

build

public void build(String uri,
                  List args)

Provide a default implementation of build that does nothing.

getDataset

public DatasetGraph getDataset()

Provides the function with access to the unfiltered dataset.

Returns:

The unfiltered dataset

returnExplanation

public void returnExplanation(ExplanationPart explanation)

Returns an explanation.

Parameters:

explanation -