org.openanzo.glitter.expression
Class UnaryFunction

java.lang.Object
  org.openanzo.glitter.expression.FunctionBase
      org.openanzo.glitter.expression.UnaryFunction

All Implemented Interfaces:

Function, FunctionOnValues

Direct Known Subclasses:

Datatype, IsBlank, IsIRI, IsLiteral, Lang, Not, Str, UnaryMinus, UnaryPlus, XSDDouble, XSDInteger, XSDString

public abstract class UnaryFunction
extends FunctionBase
implements FunctionOnValues

Base class for SPARQL functions that take a single argument. This base class takes care of checking that only a single argument is passed to a unary function.

Author:

lee

Constructor Summary

UnaryFunction()

Method Summary

RDFTerm	call(java.util.List<RDFTerm> arguments) Invokes the function and determines a return value.
abstract RDFTerm	call(RDFTerm arg1) An unpackaged version of FunctionOnValues.call(List) that receives the single argument to the function.

Methods inherited from class org.openanzo.glitter.expression.FunctionBase

compareBooleans, compareBooleans, compareDateTimes, compareNumerics, compareStringLiterals, operatesOnTypeErrors, operatesOnValues

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.openanzo.glitter.expression.Function

getIdentifier, operatesOnTypeErrors, operatesOnValues

Constructor Detail

UnaryFunction

public UnaryFunction()

Method Detail

call

public RDFTerm call(java.util.List<RDFTerm> arguments)
             throws ExpressionEvaluationException

Description copied from interface: FunctionOnValues

Invokes the function and determines a return value.

Specified by:

call in interface FunctionOnValues

Parameters:

arguments - The (evaluated) RDF terms being passed to the function

Returns:

The result of evaluating this function against the given arguments

Throws:

ExpressionEvaluationException - For invalid types, or other expression evalutaion problems

call

public abstract RDFTerm call(RDFTerm arg1)
                      throws IncompatibleTypeException

An unpackaged version of FunctionOnValues.call(List) that receives the single argument to the function.

Parameters:

arg1 - The single unary argument to the function

Returns:

The return value of the function.

Throws:

IncompatibleTypeException