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Re: Working RDF query client using Apache Axis

From: Glen Daniels <gdaniels@macromedia.com>
Date: Mon, 3 Sep 2001 12:11:30 -0400
Message-ID: <01de01c13493$1b260d40$6b00a8c0@ne.mediaone.net>
To: "Dan Brickley" <danbri@w3.org>, <www-archive@w3.org>
Cc: <libby.miller@bris.ac.uk>
> Seems to work. The 3rd argument to the server specifies the serialization
> policy (ie. whether to use the Map construct); this may turn out to be an
> interop headache, dunno.

We're thinking of adding a convenience function which will deserialize
everything it doesn't understand by default as a HashMap of element->content
(content = String or another HashMap), which is probably something like what
SOAP::Lite does too.  Not in yet, though.

> ps. still some bits in code below I could strip out; it's a recycled Axis
test

How's this (didn't run it, btw):

package org.w3c.inkling.soap;

import java.net.*;
import java.io.*;
import java.util.*;

import org.apache.axis.*;
import org.apache.axis.transport.http.HTTPTransport;
import org.apache.axis.utils.*;
import org.apache.axis.client.*;
import java.lang.reflect.Array;
import org.apache.axis.encoding.*;
import org.apache.axis.server.AxisServer;
import org.apache.axis.utils.QName;
import org.xml.sax.InputSource;


public class RDFQClient {

    public static String query =  "SELECT ?x, ?l, ?c" +
            "FROM     http://xmlns.com/wordnet/1.6/Job "+
            "WHERE "+
            "  (web::type ?x rdfs::Class) "+
            "  (rdfs::label ?x ?l) "+
            "  (rdfs::description ?x ?c) "+
            "USING web FOR http://www.w3.org/1999/02/22-rdf-syntax-ns# "+
            "rdfs FOR http://www.w3.org/2000/01/rdf-schema#";

    public static String data = "http://xmlns.com/wordnet/1.6/Job";

    /**
     * Send a hardcoded message to the server, and print the response.
     */
    public static void doTest (String args[], String service) throws
Exception {
        Options      opts    = new Options( args );
        String       url     = opts.getURL();
        String       action  = "EchoService" ;

        if (service != null) {
            action = service;
        }

        Debug.setDebugLevel( opts.isFlagSet( 'd' ) );

        args = opts.getRemainingArgs();
        if ( args != null ) action = args[0];

        url = "http://fireball.dyndns.org/cgi-bin/soap"; // danbri hack
        action = "http://rdfweb.org/RDF/RDFWeb/SOAPDemo#squish";

        ServiceClient client = new ServiceClient(url);

        client.set(HTTPTransport.URL, url);
        client.set(HTTPTransport.ACTION, action);

        String ns = "http://rdfweb.org/RDF/RDFWeb/SOAPDemo";
        RPCParam queryParam = new RPCParam(ns, "query", query);
        RPCParam dataParam = new RPCParam(ns, "data", data);
        Object [] params = new Object [] { queryParam, dataParam };

        Object result = client.invoke(ns, "squish", params);

        ArrayList rows = (ArrayList)result;
        System.out.println("\n\nGot rows: "+ rows +"\n\n");

        System.out.println("result = " +result ) ;
        Object[] answers = (Object[])rows.toArray();
        for (int i=0; i<answers.length; i++) {
            HashMap h = (HashMap)answers[i];
            System.out.println("Answer "+i+" = "+ h +"\n\n");
        }
    }

    public static void main(String args[]) throws Exception{
        doTest(args, null);
    }
    public static void mainWithService(String args[], String service) throws
Exception{
        doTest(args, service);
    }
}
Received on Monday, 3 September 2001 12:24:24 GMT

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