Package org.jrdf.example

Source Code of org.jrdf.example.RdfXmlParserExample

/*
* $Header$
* $Revision: 2894 $
* $Date: 2009-01-28 07:25:13 +1000 (Wed, 28 Jan 2009) $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2003-2009 The JRDF Project.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. The end-user documentation included with the redistribution, if
*    any, must include the following acknowlegement:
*       "This product includes software developed by the
*        the JRDF Project (http://jrdf.sf.net/)."
*    Alternately, this acknowlegement may appear in the software itself,
*    if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The JRDF Project" and "JRDF" must not be used to endorse
*    or promote products derived from this software without prior written
*    permission. For written permission, please contact
*    newmana@users.sourceforge.net.
*
* 5. Products derived from this software may not be called "JRDF"
*    nor may "JRDF" appear in their names without prior written
*    permission of the JRDF Project.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the JRDF Project.  For more
* information on JRDF, please see <http://jrdf.sourceforge.net/>.
*
*/

package org.jrdf.example;

import org.jrdf.JRDFFactory;
import org.jrdf.SortedMemoryJRDFFactory;
import org.jrdf.collection.MemMapFactory;
import static org.jrdf.graph.AnyObjectNode.ANY_OBJECT_NODE;
import static org.jrdf.graph.AnyPredicateNode.ANY_PREDICATE_NODE;
import static org.jrdf.graph.AnySubjectNode.ANY_SUBJECT_NODE;
import org.jrdf.graph.Graph;
import org.jrdf.graph.Triple;
import org.jrdf.parser.Parser;
import org.jrdf.parser.rdfxml.GraphRdfXmlParser;
import org.jrdf.util.ClosableIterable;
import static org.jrdf.util.EscapeURL.toEscapedString;

import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.zip.GZIPInputStream;
import java.util.zip.Inflater;
import java.util.zip.InflaterInputStream;

/**
* A simple example of parsing in a RDF/XML file into an in memory JRDF graph.
*
* @author Andrew Newman
* @version $Revision: 2894 $
*/
public final class RdfXmlParserExample {
    private static final JRDFFactory JRDF_FACTORY = SortedMemoryJRDFFactory.getFactory();
    private static final String DEFAULT_RDF_URL = "http://rss.slashdot.org/Slashdot/slashdot";

    // file:///temp/java/
//    LongIndex[] indexes = new LongIndex[]{new LongIndexMem(), new LongIndexMem(), new LongIndexMem()};
//    NodePool nodePool = new JeNodePoolFactory().createNewNodePool();
//    NodeComparator comparator = new NodeComparatorImpl(new NodeTypeComparatorImpl());
//    GraphFactory factory = new OrderedGraphFactoryImpl(indexes, nodePool, comparator);
//    Parser parser = new RdfXmlParser(factory.getGraph().getElementFactory());
//    parser.parse(in, EscapeURL.toEscapedString(url));

    public static void main(String[] args) throws Exception {
        URL url = getDocumentURL(args);
        InputStream in = getInputStream(url);
        try {
            final Graph jrdfMem = JRDF_FACTORY.getNewGraph();
            Parser parser = new GraphRdfXmlParser(jrdfMem, new MemMapFactory());
            parser.parse(in, toEscapedString(url));
            ClosableIterable<Triple> triples = jrdfMem.find(ANY_SUBJECT_NODE, ANY_PREDICATE_NODE, ANY_OBJECT_NODE);
            try {
                for (Triple triple : triples) {
                    System.out.println("Graph: " + triple);
                }
                System.out.println("Total number of statements: " + jrdfMem.getNumberOfTriples());
            } finally {
                triples.iterator().close();
            }
        } finally {
            in.close();
        }
    }

    private static InputStream getInputStream(URL url) throws Exception {
        URLConnection urlConnection = url.openConnection();
        urlConnection.setRequestProperty("Accept-Encoding", "gzip, deflate");
        urlConnection.connect();
        String encoding = urlConnection.getContentEncoding();
        InputStream in;
        if (encoding != null && encoding.equalsIgnoreCase("gzip")) {
            in = new GZIPInputStream(urlConnection.getInputStream());
        } else if (encoding != null && encoding.equalsIgnoreCase("deflate")) {
            in = new InflaterInputStream(urlConnection.getInputStream(), new Inflater(true));
        } else {
            in = urlConnection.getInputStream();
        }
        return in;
    }

    private static URL getDocumentURL(String[] args) throws MalformedURLException {
        String baseURL;
        if (args.length == 0 || args[0].length() == 0) {
            System.out.println("First argument empty so using: " + DEFAULT_RDF_URL);
            baseURL = DEFAULT_RDF_URL;
        } else {
            baseURL = args[0];
        }
        return new URL(baseURL);
    }
}
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