demonstrate graph operations in apache jena - Java Big Data

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Description

demonstrate graph operations in apache jena

Demo Code

/*//from   w  w w. j  a va 2s.  com
 * 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
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 */

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

import java.io.*;

/** Tutorial 9 - demonstrate graph operations
 */
public class Tutorial09 extends Object {

    static final String inputFileName1 = "vc-db-3.rdf";
    static final String inputFileName2 = "vc-db-4.rdf";

    public static void main(String args[]) {
        // create an empty model
        Model model1 = ModelFactory.createDefaultModel();
        Model model2 = ModelFactory.createDefaultModel();

        // use the class loader to find the input file
        InputStream in1 = FileManager.get().open(inputFileName1);
        if (in1 == null) {
            throw new IllegalArgumentException("File: " + inputFileName1
                    + " not found");
        }
        InputStream in2 = FileManager.get().open(inputFileName2);
        if (in2 == null) {
            throw new IllegalArgumentException("File: " + inputFileName2
                    + " not found");
        }

        // read the RDF/XML files
        model1.read(in1, "");
        model2.read(in2, "");

        // merge the graphs
        Model model = model1.union(model2);

        // print the graph as RDF/XML
        model.write(System.out, "RDF/XML-ABBREV");
        System.out.println();
    }
}

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