navigating a model in apache jena - Java Big Data

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Description

navigating a model in apache jena

Demo Code

/*/*from  w ww  .  jav a 2 s.  c  om*/
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.jena.rdf.model.*;
import org.apache.jena.util.FileManager;
import org.apache.jena.vocabulary.*;

import java.io.*;

/** Tutorial navigating a model
 */
public class Tutorial06 extends Object {

    static final String inputFileName = "vc-db-1.rdf";
    static final String johnSmithURI = "http://somewhere/JohnSmith/";

    public static void main(String args[]) {
        // create an empty model
        Model model = ModelFactory.createDefaultModel();

        // use the FileManager to find the input file
        InputStream in = FileManager.get().open(inputFileName);
        if (in == null) {
            throw new IllegalArgumentException("File: " + inputFileName
                    + " not found");
        }

        // read the RDF/XML file
        model.read(new InputStreamReader(in), "");

        // retrieve the Adam Smith vcard resource from the model
        Resource vcard = model.getResource(johnSmithURI);

        // retrieve the value of the N property
        Resource name = (Resource) vcard.getRequiredProperty(VCARD.N)
                .getObject();
        // retrieve the given name property
        String fullName = vcard.getRequiredProperty(VCARD.FN).getString();
        // add two nick name properties to vcard
        vcard.addProperty(VCARD.NICKNAME, "Smithy").addProperty(
                VCARD.NICKNAME, "Adman");

        // set up the output
        System.out.println("The nicknames of \"" + fullName + "\" are:");
        // list the nicknames
        StmtIterator iter = vcard.listProperties(VCARD.NICKNAME);
        while (iter.hasNext()) {
            System.out.println("    "
                    + iter.nextStatement().getObject().toString());
        }
    }
}

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