[
https://issues.apache.org/jira/browse/JENA-489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andy Seaborne resolved JENA-489.
--------------------------------
Resolution: Fixed
Assignee: Andy Seaborne
> error message for builtin with wrong number of args is wrong
> ------------------------------------------------------------
>
> Key: JENA-489
> URL: https://issues.apache.org/jira/browse/JENA-489
> Project: Apache Jena
> Issue Type: Bug
> Components: Jena
> Affects Versions: Jena 2.10.0
> Reporter: Joshua Taylor
> Assignee: Andy Seaborne
> Priority: Trivial
> Fix For: Jena 2.10.2
>
> Original Estimate: 0.05h
> Remaining Estimate: 0.05h
>
> The message for a syntax error in the rule parser when a builtin is used in a
> backwards rule with the wrong number of arguments is wrong. The message is
> generated in emitBody(Functor functor) in RuleClauseCode by these lines:
> {noformat}
> throw new LPRuleSyntaxException("Wrong number of arguments to
> functor " + functor.getName()
> + " expected " +
> functor.getArgLength(), rule);
> {noformat}
> Instead of functor.getArgLength() should be builtin.getArgLength(). In
> context these are:
> {noformat}
> void emitBody(Functor functor) {
> Node[] fargs = functor.getArgs();
> Builtin builtin = functor.getImplementor();
> if (builtin == null) {
> throw new LPRuleSyntaxException("Unknown builtin operation "
> + functor.getName(), rule);
> }
> if (builtin.getArgLength() != 0 && builtin.getArgLength() !=
> fargs.length) {
> throw new LPRuleSyntaxException("Wrong number of arguments to
> functor " + functor.getName()
> + " expected " +
> functor.getArgLength(), rule);
> }
> for (int i = 0; i < fargs.length; i++) {
> Node node = fargs[i];
> // We optionally force an eager dereference of variables here.
> // We used to force this but the current builtin
> implementations
> // now robust against it (the do a deref themselves anyway).
> emitBodyPut(node, i, true);
> }
> code[p++] = CALL_BUILTIN;
> code[p++] = (byte)fargs.length;
> args.add(builtin);
> }
> {noformat}
> Code that demonstates the misleading message follows:
> {noformat}
> import com.hp.hpl.jena.rdf.model.InfModel;
> import com.hp.hpl.jena.rdf.model.Model;
> import com.hp.hpl.jena.rdf.model.ModelFactory;
> import com.hp.hpl.jena.reasoner.rulesys.GenericRuleReasoner;
> import com.hp.hpl.jena.reasoner.rulesys.Rule;
> import com.hp.hpl.jena.reasoner.rulesys.builtins.Sum;
> import com.hp.hpl.jena.vocabulary.RDF;
> public class JenaBuiltinErrorMessageExample {
> static String rules = "" +
> "[(?x thriceValue ?vvv) <-\n" +
> " (?x rdf:value ?v)\n" +
> " sum(?v,?v,?v,?vvv)]\n" +
> "";
> Sum sum;
> public static void main( String[] args ) {
> GenericRuleReasoner reasoner = new GenericRuleReasoner(
> Rule.parseRules( rules ));
> Model base = ModelFactory.createDefaultModel();
> base.createResource().addLiteral( RDF.value, 10 );
> InfModel inf = ModelFactory.createInfModel( reasoner, base );
> inf.write( System.out, "N3" );
> }
> }
> {noformat}
> This throws an exception with a misleading message:
> {noformat}
> Exception in thread "main"
> com.hp.hpl.jena.reasoner.rulesys.impl.LPRuleSyntaxException: Syntax error in
> backward rule: [ (?x thriceValue ?vvv) <- (?x rdf:value ?v) sum(?v ?v ?v
> ?vvv) ]
> Wrong number of arguments to functor sum expected 4
> at
> com.hp.hpl.jena.reasoner.rulesys.impl.RuleClauseCode$CompileState.emitBody(RuleClauseCode.java:607)
> at
> com.hp.hpl.jena.reasoner.rulesys.impl.RuleClauseCode.compile(RuleClauseCode.java:213)
> at
> com.hp.hpl.jena.reasoner.rulesys.impl.LPRuleStore.compileAll(LPRuleStore.java:249)
> at
> com.hp.hpl.jena.reasoner.rulesys.impl.LPRuleStore.codeFor(LPRuleStore.java:99)
> at
> com.hp.hpl.jena.reasoner.rulesys.impl.LPRuleStore.codeFor(LPRuleStore.java:119)
> at
> com.hp.hpl.jena.reasoner.rulesys.impl.LPInterpreter.<init>(LPInterpreter.java:91)
> at
> com.hp.hpl.jena.reasoner.rulesys.impl.LPBRuleEngine.find(LPBRuleEngine.java:109)
> at
> com.hp.hpl.jena.reasoner.rulesys.FBRuleInfGraph.findWithContinuation(FBRuleInfGraph.java:575)
> at
> com.hp.hpl.jena.reasoner.rulesys.FBRuleInfGraph.graphBaseFind(FBRuleInfGraph.java:606)
> at
> com.hp.hpl.jena.reasoner.BaseInfGraph.graphBaseFind(BaseInfGraph.java:370)
> at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:266)
> at
> com.hp.hpl.jena.graph.compose.DisjointUnion.graphBaseFind(DisjointUnion.java:39)
> at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:266)
> at
> com.hp.hpl.jena.graph.impl.GraphBase.graphBaseFind(GraphBase.java:287)
> at com.hp.hpl.jena.graph.impl.GraphBase.find(GraphBase.java:284)
> at
> com.hp.hpl.jena.rdf.model.impl.ModelCom.listStatements(ModelCom.java:449)
> at
> com.hp.hpl.jena.rdf.model.impl.ModelCom.listStatements(ModelCom.java:455)
> at
> com.hp.hpl.jena.n3.N3JenaWriterPP.prepareLists(N3JenaWriterPP.java:81)
> at com.hp.hpl.jena.n3.N3JenaWriterPP.prepare(N3JenaWriterPP.java:67)
> at
> com.hp.hpl.jena.n3.N3JenaWriterCommon.processModel(N3JenaWriterCommon.java:275)
> at
> com.hp.hpl.jena.n3.N3JenaWriterCommon.write(N3JenaWriterCommon.java:197)
> at
> com.hp.hpl.jena.n3.N3JenaWriterCommon.write(N3JenaWriterCommon.java:209)
> at com.hp.hpl.jena.n3.N3JenaWriter.write(N3JenaWriter.java:171)
> at com.hp.hpl.jena.rdf.model.impl.ModelCom.write(ModelCom.java:327)
> at
> JenaBuiltinErrorMessageExample.main(JenaBuiltinErrorMessageExample.java:20)
> {noformat}
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