de.fuberlin.wiwiss.wiqa.explanation
Class ExplanationStore

java.lang.Object
  de.fuberlin.wiwiss.wiqa.explanation.ExplanationStore

public class ExplanationStore

extends Object

A temporary storage for explanation fragments. This is used to associate the explanations returned from ExplainableFunctions with the bindings that they explain.

ARQ Bindings cannot store explanation parts. They can only store RDF nodes. Therefore, we store the parts in this class, and store numeric tokens in the bindings, in ÒmagicÓ variables ?__explanation_function1 and so on.

The QueryIterExplain retrieves the parts after query execution and integrates them into the overall explanation.

A new ExplanationStore must be used for each query execution to avoid memory leaks.

Version:

$Id: ExplanationStore.java,v 1.1 2006/01/31 19:19:04 cyganiak Exp $

Author:

Oliver Maresch (oliver-maresch@gmx.de), Richard Cyganiak (richard@cyganiak.de)

Constructor Summary

ExplanationStore()

Method Summary

ExplanationPart	get(Binding binding, String functionName) Retrieves an explanation part from the store.
void	store(BindingMap binding, ExplanationPart part, String functionName) Puts an explanation into the store and adds a magic variable to the binding.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExplanationStore

public ExplanationStore()

Method Detail

store

public void store(BindingMap binding,
                  ExplanationPart part,
                  String functionName)

Puts an explanation into the store and adds a magic variable to the binding.

Parameters:

binding - A binding

part - An explanation part

functionName - The name of the explaining function

get

public ExplanationPart get(Binding binding,
                           String functionName)

Retrieves an explanation part from the store.

Parameters:

binding - A binding

functionName - The name of the explaining function

Returns:

The part stored for this function & binding