Hi Martynas,
the built-in SPARQL expression modules are defined in SPL, e.g.
sp:ge a spin:Function ;
rdfs:comment "Returns true if ?arg1 >= ?arg2." ;
rdfs:label "ge"^^xsd:string ;
rdfs:subClassOf spl:BooleanFunctions ;
spin:constraint [ a spl:Argument ;
rdfs:comment "the first operand" ;
spl:predicate sp:arg1 ;
spl:valueType rdfs:Literal
] ;
spin:constraint [ a spl:Argument ;
rdfs:comment "the second operand" ;
spl:predicate sp:arg2 ;
spl:valueType rdfs:Literal
] ;
spin:returnType xsd:boolean ;
spin:symbol ">="^^xsd:string .
this means that you could write a SPARQL query that walks through the
declared spin:constraints to find the number of required arguments for
each function/expression. In fact, spl:Argument is a template that
defines a constraint that you could evaluate with the SPIN constraint
checker itself.
HTH
Holger
On 6/27/2014 7:49, [email protected] wrote:
Hey,
I have a situation where SPIN expression arguments come in directly
from user input (faceted search). For example, sp:arg2 as numeric
literal for sp:ge or as plain literal for sp:regex.
The problem is, that if the user submits the SPIN RDF with empty input
values, sp:arg2 property is missing on expression, and building a
query I either get a com.hp.hpl.jena.query.QueryParseException or this:
java.lang.ArrayIndexOutOfBoundsException: 2
org.topbraid.spin.model.impl.FunctionCallImpl.getArgumentProperties(FunctionCallImpl.java:65)
org.topbraid.spin.model.impl.FunctionCallImpl.getArguments(FunctionCallImpl.java:49)
org.topbraid.spin.model.impl.FunctionCallImpl.print(FunctionCallImpl.java:172)
org.topbraid.spin.util.SPINExpressions.printExpressionString(SPINExpressions.java:204)
org.topbraid.spin.model.impl.AbstractSPINResourceImpl.printNestedExpressionString(AbstractSPINResourceImpl.java:146)
org.topbraid.spin.model.impl.FilterImpl.print(FilterImpl.java:46)
org.topbraid.spin.model.impl.ElementListImpl.print(ElementListImpl.java:139)
org.topbraid.spin.model.impl.AbstractSPINResourceImpl.printNestedElementList(AbstractSPINResourceImpl.java:132)
org.topbraid.spin.model.impl.QueryImpl.printWhere(QueryImpl.java:221)
org.topbraid.spin.model.impl.SelectImpl.printSPINRDF(SelectImpl.java:99)
org.topbraid.spin.model.impl.QueryImpl.print(QueryImpl.java:117)
org.topbraid.spin.model.impl.SubQueryImpl.print(SubQueryImpl.java:44)
org.topbraid.spin.model.impl.ElementListImpl.print(ElementListImpl.java:139)
org.topbraid.spin.model.impl.UnionImpl.print(UnionImpl.java:33)
org.topbraid.spin.model.impl.ElementListImpl.print(ElementListImpl.java:139)
org.topbraid.spin.model.impl.AbstractSPINResourceImpl.printNestedElementList(AbstractSPINResourceImpl.java:132)
org.topbraid.spin.model.impl.QueryImpl.printWhere(QueryImpl.java:221)
org.topbraid.spin.model.impl.ConstructImpl.printSPINRDF(ConstructImpl.java:55)
org.topbraid.spin.model.impl.QueryImpl.print(QueryImpl.java:117)
org.topbraid.spin.arq.ARQFactory.createCommandString(ARQFactory.java:125)
org.topbraid.spin.arq.ARQFactory.createQuery(ARQFactory.java:219)
What would be the shortest way to check if expression has all
arguments it needs? If it doesn't, I can ignore it. Does it always
have to have sp:arg2?
Thanks.
Martynas
graphityhq.com
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