com.bigdata.rdf.internal.constraints

Class EBVBOp

java.lang.Object

com.bigdata.bop.CoreBaseBOp

com.bigdata.bop.BOpBase

com.bigdata.rdf.internal.constraints.IVValueExpression<XSDBooleanIV>

com.bigdata.rdf.internal.constraints.XSDBooleanIVValueExpression

com.bigdata.rdf.internal.constraints.EBVBOp

All Implemented Interfaces:

BOp, IValueExpression<XSDBooleanIV>, INeedsMaterialization, IPropertySet, Serializable, Cloneable

public class EBVBOp
extends XSDBooleanIVValueExpression
implements INeedsMaterialization

Calculates the "effective boolean value" of an IValueExpression. See the SPARQL spec for details.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.bigdata.rdf.internal.constraints.IVValueExpression

IVValueExpression.Annotations

Nested classes/interfaces inherited from interface com.bigdata.rdf.internal.constraints.INeedsMaterialization

INeedsMaterialization.Requirement

Field Summary

Fields inherited from class com.bigdata.bop.CoreBaseBOp

DEFAULT_INITIAL_CAPACITY

Fields inherited from interface com.bigdata.bop.BOp

NOANNS, NOARGS

Constructor Summary

Constructors

Constructor and Description
EBVBOp(BOp[] args, Map<String,Object> anns) Required shallow copy constructor.
EBVBOp(EBVBOp op) Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).
EBVBOp(IValueExpression<? extends IV> x)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	accept(IBindingSet bs) 11.2.2 Effective Boolean Value (EBV) Effective boolean value is used to calculate the arguments to the logical functions logical-and, logical-or, and fn:not, as well as evaluate the result of a FILTER expression.
INeedsMaterialization.Requirement	getRequirement() The EBVBOp only needs materialization if its internal value expression does not evaluate to an XSDBooleanIV.

Methods inherited from class com.bigdata.rdf.internal.constraints.XSDBooleanIVValueExpression

areGlobalsRequired, get, wrap

Methods inherited from class com.bigdata.rdf.internal.constraints.IVValueExpression

anns, asIV, asIV, asLiteral, asValue, get, getAndCheckBound, getAndCheckLiteral, getAndCheckLiteralValue, getLexiconConfiguration, getNamespace, getTimestamp, getValueFactory, literalLabel

Methods inherited from class com.bigdata.bop.BOpBase

__replaceArg, _clearProperty, _set, _setProperty, annotations, annotationsCopy, annotationsEqual, annotationsRef, argIterator, args, argsCopy, arity, clearAnnotations, clearProperty, deepCopy, deepCopy, getProperty, setArg, setProperty, setUnboundProperty, toArray, toArray

Methods inherited from class com.bigdata.bop.CoreBaseBOp

annotationsEqual, annotationsToString, annotationsToString, annotationValueToString, checkArgs, clone, equals, getEvaluationContext, getId, getProperty, getRequiredProperty, hashCode, indent, isController, mutation, shortenName, toShortString, toString, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.bigdata.bop.IValueExpression

toString

Methods inherited from interface com.bigdata.bop.BOp

annotations, argIterator, args, arity, clone, getEvaluationContext, getId, getProperty, getRequiredProperty, isController, setProperty, toArray, toArray, toShortString, toString

Methods inherited from interface cutthecrap.utils.striterators.IPropertySet

getProperty

Constructor Detail

EBVBOp

public EBVBOp(IValueExpression<? extends IV> x)

EBVBOp

public EBVBOp(BOp[] args,
      Map<String,Object> anns)

Required shallow copy constructor.

EBVBOp

public EBVBOp(EBVBOp op)

Constructor required for com.bigdata.bop.BOpUtility#deepCopy(FilterNode).

Method Detail

accept

public boolean accept(IBindingSet bs)

11.2.2 Effective Boolean Value (EBV) Effective boolean value is used to calculate the arguments to the logical functions logical-and, logical-or, and fn:not, as well as evaluate the result of a FILTER expression. The XQuery Effective Boolean Value rules rely on the definition of XPath's fn:boolean. The following rules reflect the rules for fn:boolean applied to the argument types present in SPARQL Queries: The EBV of any literal whose type is xsd:boolean or numeric is false if the lexical form is not valid for that datatype (e.g. "abc"^^xsd:integer). If the argument is a typed literal with a datatype of xsd:boolean, the EBV is the value of that argument. If the argument is a plain literal or a typed literal with a datatype of xsd:string, the EBV is false if the operand value has zero length; otherwise the EBV is true. If the argument is a numeric type or a typed literal with a datatype derived from a numeric type, the EBV is false if the operand value is NaN or is numerically equal to zero; otherwise the EBV is true. All other arguments, including unbound arguments, produce a type error. An EBV of true is represented as a typed literal with a datatype of xsd:boolean and a lexical value of "true"; an EBV of false is represented as a typed literal with a datatype of xsd:boolean and a lexical value of "false".

Specified by:

accept in class XSDBooleanIVValueExpression

Parameters:

bs - The source solution.

Returns:

true iff the function accepts the solution.

getRequirement

public INeedsMaterialization.Requirement getRequirement()

The EBVBOp only needs materialization if its internal value expression does not evaluate to an XSDBooleanIV.

Specified by:

getRequirement in interface INeedsMaterialization