Sparql query with customized filter

[Cong Wang]

Hi,

I implemented a edit distance filter using jena-arq, and tried to sparql query based on it. But it returns error (works on jena), 

"

        Exception in thread "main" com.hp.hpl.jena.sparql.ARQException: com.complexible.stardog.StardogException: com.complexible.stardog.plan.eval.ExecutionException: There was an error while creating a new query plan

"

Is that stardog doesn't support customized filter? 

Here isthe code:

"

public class LevenshteinFilter extends FunctionBase2 {

public NodeValue exec(NodeValue value1, NodeValue value2) {

int i = StringUtils.getLevenshteinDistance(value1.asString(),

value2.asString());

return NodeValue.makeInteger(i);

}

}

...

Connection aConn = ConnectionConfiguration.to("myDB").server("snarl://localhost:5820/").credentials("admin", "admin").connect();

Model aModel = SDJenaFactory.createModel(aConn);

String functionUri = "http://www.example.org/LevenshteinFunction";

FunctionRegistry.get().put(functionUri, LevenshteinFilter.class);

String sparql = "PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>"

+ "SELECT ?s1 ?s2 ?o1 ?o2 WHERE { ?s1 rdfs:label ?o1. ?s2 rdfs:label ?o2 ."

+ " FILTER(STRSTARTS(str(?s1), \"http://www.wikidata\") && STRSTARTS(str(?s2), \"http://wordnet-rdf\") && <"

+ functionUri + ">(str(?o1),str(?o2)<3))}  LIMIT 10";

QueryExecution qexec = QueryExecutionFactory.create(sparql, aModel);

ResultSet rs = qexec.execSelect();

while (rs.hasNext()) {

System.out.println(rs.next());

}

"

Thanks.

[Kendall Clark]

Hi,

Did you follow the extensibility patterns described at https://github.com/clarkparsia/stardog-examples/tree/master/examples/function ?

Cheers,

Kendall

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[Cong Wang]

Hi Kendall,

Thanks for the information. I didn't find this useful description. 

However, I can't find the jar package containing "com.complexible.stardog.plan.filter.functions.AbstractFunction;" I had added all jars into my library.

To unsubscribe from this group and stop receiving emails from it, send an email to stardog+u...@clarkparsia.com.

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Cong Wang
Ph.D Candidate,
Kno.e.sis Center,
Wright State University.

[Cong Wang]

I guess that's the new feature in the unreleased stardog 3.0?  am I right?

[Kendall Clark]

Custom aggregates are new for 3.0. Custom functions have been around for a while.

To reproduce yr bug report, we need the code yr using and the version of Stardog if it's not 2.2.4. You can send it to the list here or email me directly.

Cheers,

Kendall

On Wed, Feb 11, 2015 at 12:55 PM, Cong Wang <joshu...@gmail.com> wrote:

I guess that's the new feature in the unreleased stardog 3.0?  am I right?

On Wed, Feb 11, 2015 at 12:44 PM, Cong Wang <joshu...@gmail.com> wrote:

Hi Kendall,

Thanks for the information. I didn't find this useful description. 

However, I can't find the jar package containing "com.complexible.stardog.plan.filter.functions.AbstractFunction;" I had added all jars into my library.

On Wed, Feb 11, 2015 at 12:23 PM, Kendall Clark <ken...@clarkparsia.com> wrote:

Hi,

Did you follow the extensibility patterns described at https://github.com/clarkparsia/stardog-examples/tree/master/examples/function ?

Cheers,

Kendall

[Cong Wang]

Thanks. 

I am using the Stardog 2.2.4. 

And when I declare a Class "public class LevenshteinFilter extends AbstractFunction implements StringFunction" I cannot find the corresponding imports.

I don't have further code due to the missing imports.

Best.

[Mike Grove]

On Wed, Feb 11, 2015 at 1:05 PM, Cong Wang <joshu...@gmail.com> wrote:

Thanks. 

I am using the Stardog 2.2.4. 

And when I declare a Class "public class LevenshteinFilter extends AbstractFunction implements StringFunction" I cannot find the corresponding imports.

I don't have further code due to the missing imports.

The 2.2.4 version of the example is available at [1].

Cheers,

Mike

[1] https://github.com/clarkparsia/stardog-examples/blob/57fb4177ab5487d965e39a7bc1765a0369f5eec7/examples/function/main/src/com/complexible/stardog/examples/functions/TitleCase.java

[Cong Wang]

Hi Mike,

Yes, I found this example. But there seems no corresponding .jar package in Stardog 2.2.4.

[Mike Grove]

On Wed, Feb 11, 2015 at 1:26 PM, Cong Wang <joshu...@gmail.com> wrote:

Hi Mike,

Yes, I found this example. But there seems no corresponding .jar package in Stardog 2.2.4.

It sounds like your classpath is wrong.  You should review which jars you've added, that class is in the stardog-2.2.4.jar.

Cheers,

Mike

[Cong Wang]

Oh, Thanks. I found it.

It's in server/dbms/ folder. I just added all jars in client..

Thanks a lot.

[Cong Wang]

A little bit complex, but I finally made my filter work.

Thanks all.