org.openanzo.glitter.syntax.abstrakt
Class SimpleExpression

java.lang.Object
  org.openanzo.glitter.syntax.abstrakt.Expression
      org.openanzo.glitter.syntax.abstrakt.SimpleExpression

public class SimpleExpression
extends Expression

A SimpleExpression represents an expression (i.e., in a FILTER or ORDER BY) which is simply a TriplePatternComponent (a variable, IRI ref., bnode, or literal).

Author:

Lee

Constructor Summary

SimpleExpression(TriplePatternComponent tpc)
Constructs a SimpleExpression from an RDFTerm or Variable.

Method Summary

RDFTerm	evaluate(PatternSolution environment)
java.util.Set<Variable>	getReferencedVariables()
TriplePatternComponent	getTerm()

Methods inherited from class java.lang.Object

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

Constructor Detail

SimpleExpression

public SimpleExpression(TriplePatternComponent tpc)

Constructs a SimpleExpression from an RDFTerm or Variable.

Parameters:

tpc -

Method Detail

evaluate

public RDFTerm evaluate(PatternSolution environment)
                 throws ExpressionEvaluationException

Specified by:

evaluate in class Expression

Parameters:

environment - A set of bindings to use to evaluate Bindable objects in the expression.

Returns:

The RDFTerm that is the value of evaluating this expression.

Throws:

ExpressionEvaluationException - If there is an error (e.g. a type error) in evaluating this expression.

getTerm

public TriplePatternComponent getTerm()

Returns:

The triple pattern component that comprises this expression.

getReferencedVariables

public java.util.Set<Variable> getReferencedVariables()

Specified by:

getReferencedVariables in class Expression

Returns:

A set of all the variables that occur in this expression.