org.openanzo.glitter.expression.builtin
Class Bound

java.lang.Object
  org.openanzo.glitter.expression.builtin.Bound

All Implemented Interfaces:

Function, FunctionOnTerms

public class Bound
extends java.lang.Object
implements FunctionOnTerms

Implements the SPARQL bound function.

Author:

lee

Constructor Summary

Bound()

Method Summary

RDFTerm	call(java.util.List<Expression> args, PatternSolution environment) Invokes the function and determines a return value.
java.net.URI	getIdentifier()
boolean	operatesOnTypeErrors()
boolean	operatesOnValues()

Methods inherited from class java.lang.Object

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

Constructor Detail

Bound

public Bound()

Method Detail

call

public RDFTerm call(java.util.List<Expression> args,
                    PatternSolution environment)
             throws IncompatibleTypeException,
                    InvalidArgumentCountException

Description copied from interface: FunctionOnTerms

Invokes the function and determines a return value.

Specified by:

call in interface FunctionOnTerms

Parameters:

args - The (unevaluated) expressions that are passed to the function in the query.

environment - The current solution being evaluated against

Returns:

The result of evaluating this function against the arguments in the given environment

Throws:

IncompatibleTypeException

InvalidArgumentCountException

getIdentifier

public java.net.URI getIdentifier()

Specified by:

getIdentifier in interface Function

Returns:

The identifier for this function

operatesOnValues

public boolean operatesOnValues()

Specified by:

operatesOnValues in interface Function

Returns:

true if this function's arguments should be values evaluated in the context of the environment created from each set of bindings (solution); false if the function operates directly on the surface term (e.g. a hypothetical function isVariable would operate on terms and return false)

operatesOnTypeErrors

public boolean operatesOnTypeErrors()

Specified by:

operatesOnTypeErrors in interface Function

Returns:

true if the function can process type errors as arguments; false if the function simply propagates type errors