de.fuberlin.wiwiss.wiqa.explanation
Class E_ExplainableFunction

java.lang.Object
  com.hp.hpl.jena.query.expr.ExprNode
      com.hp.hpl.jena.query.expr.ExprNodeFunction
          com.hp.hpl.jena.query.expr.E_Function
              de.fuberlin.wiwiss.wiqa.explanation.E_ExplainableFunction

All Implemented Interfaces:

Constraint, Expr

public class E_ExplainableFunction

extends E_Function

A node in the parse tree for FILTER expressions that represents a function call and which the WIQA parser emits instead of ARQ's E_Function. After calling the function, this class will check if an ExplanationPart was placed into the ExecutionContext, and store it into the binding.

Note: This is a hack. It assumes that the binding is a BindingMap. ARQ doesn't guarantee this. We use the QueryIterExplainableFilter to convert other bindings into BindingMaps, but this relies on the fact that ARQ passes bindings through to the functions without change, something that is not guaranteed by the ARQ interfaces.

Version:

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

Author:

Richard Cyganiak (richard@cyganiak.de)

Constructor Summary

E_ExplainableFunction(String name, List args)

Method Summary

NodeValue

eval(Binding binding, ExecutionContext execCxt)

Methods inherited from class com.hp.hpl.jena.query.expr.E_Function

check, getArg, getPrintName, numArgs

Methods inherited from class com.hp.hpl.jena.query.expr.ExprNodeFunction

equals, hashCode, visit

Methods inherited from class com.hp.hpl.jena.query.expr.ExprNode

getConstant, getVar, getVarName, isConstant, isSatisfied, isVariable, toString, varsMentioned

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

E_ExplainableFunction

public E_ExplainableFunction(String name,
                             List args)

Method Detail

eval

public NodeValue eval(Binding binding,
                      ExecutionContext execCxt)