AGTemporalCalendars.java

package com.franz.ag.examples;



import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.GregorianCalendar;



import org.openrdf.model.Literal;



import com.franz.ag.AllegroGraph;

import com.franz.ag.AllegroGraphConnection;

import com.franz.ag.AllegroGraphException;

import com.franz.ag.Cursor;



public class AGTemporalCalendars {



    /**

     * Demonstrates converting Gregorian Calendar objects into date-time objects

     * for storage and performing a range query.

     * 

     * @param unused

     * @throws AllegroGraphException 

     */

    public static void main(String[] args) throws AllegroGraphException {



        // Connect to server, which must already be running.

        AllegroGraphConnection ags = new AllegroGraphConnection();

        try {

            ags.enable();

        } catch (Exception e) {

            throw new AllegroGraphException("Server connection problem", e);

        }

        // Create a fresh triple-store for this example.

        AllegroGraph ts = ags.renew("datetime", AGPaths.TRIPLE_STORES);

        

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");

        GregorianCalendar cal = new GregorianCalendar();

        String date;

                

        // Register your namespaces

        ts.registerNamespace("ex","http://example.org/");

        

        // Add some triples to the store using encoded literals

        // Encoded literals are necessary when performing range queries 

        cal.set(1932, Calendar.JANUARY, 1, 0, 0, 1); 

        date = sdf.format(cal.getTime());

        ts.addStatement("!ex:person1","!ex:birthdate", ts.createEncodedLiteral(date,"date-time"));

        cal.set(1948, Calendar.FEBRUARY, 29, 23, 59, 59); 

        date = sdf.format(cal.getTime());

        ts.addStatement("!ex:person2","!ex:birthdate", ts.createEncodedLiteral(date,"date-time"));

        cal.set(1968, Calendar.MARCH, 17, 8, 0, 0); 

        date = sdf.format(cal.getTime());

        ts.addStatement("!ex:person3","!ex:birthdate", ts.createEncodedLiteral(date,"date-time"));

        cal.set(1988, Calendar.APRIL, 3, 9, 0, 0); 

        date = sdf.format(cal.getTime());

        ts.addStatement("!ex:person4","!ex:birthdate", ts.createEncodedLiteral(date,"date-time"));

        cal.set(2007, Calendar.JUNE, 31, 12, 0, 0); 

        date = sdf.format(cal.getTime());

        ts.addStatement("!ex:person5","!ex:birthdate", ts.createEncodedLiteral(date,"date-time"));

        

        // Retrieve triples by matching a range of objects

        cal.set(1980, Calendar.JANUARY, 1, 0, 0, 0); date = sdf.format(cal.getTime());

        Literal low = ts.createEncodedLiteral(date,"date-time");

        cal.set(1989, Calendar.DECEMBER, 31, 23, 59, 59); date = sdf.format(cal.getTime());

        Literal high = ts.createEncodedLiteral(date,"date-time");

        System.out.println("Retrieving triples for birthdates in the 1980's:");

        Cursor cc = ts.getStatements(null, "!ex:birthdate", low, high, null, null);

        AGUtils.showTriples(cc);



        // Close the triple store and disconnect from the server

        ts.closeTripleStore();

        ags.disable();      

    }

}
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