HDTFactory.java

/**
 * File: $HeadURL: https://hdt-java.googlecode.com/svn/trunk/hdt-java/src/org/rdfhdt/hdt/hdt/HDTFactory.java $
 * Revision: $Rev: 191 $
 * Last modified: $Date: 2013-03-03 11:41:43 +0000 (dom, 03 mar 2013) $
 * Last modified by: $Author: mario.arias $
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Contacting the authors:
 *   Mario Arias:               mario.arias@deri.org
 *   Javier D. Fernandez:       jfergar@infor.uva.es
 *   Miguel A. Martinez-Prieto: migumar2@infor.uva.es
 *   Alejandro Andres:          fuzzy.alej@gmail.com
 */

package org.rdfhdt.hdt.hdt;

import org.rdfhdt.hdt.hdt.impl.HDTImpl;
import org.rdfhdt.hdt.hdt.impl.ModeOfLoading;
import org.rdfhdt.hdt.hdt.impl.TempHDTImpl;
import org.rdfhdt.hdt.options.HDTOptions;
import org.rdfhdt.hdt.options.HDTSpecification;

/**
 * Factory that creates HDT objects
 * 
 */
public class HDTFactory {
	private static TempDictTriplesFactory tempFactory;
	
	private HDTFactory() {}
	
	public static TempDictTriplesFactory getTempFactory() {
		if(tempFactory==null) {
			try {
				Class<?> managerImplClass = Class.forName("org.rdfhdt.hdtdisk.HDTDiskFactory");
				tempFactory = (TempDictTriplesFactory) managerImplClass.newInstance();
			} catch (ClassNotFoundException e) {
				throw new RuntimeException("Class org.rdfhdt.hdtdisk.HDTDiskFactory not found. Did you include the hdt-disk.jar in the classpath?");
			} catch (InstantiationException e) {
				throw new RuntimeException("Cannot create implementation for HDTDiskFactory. Does the class org.rdfhdt.hdtdisk.HDTDiskFactory implement TempDictTriplesFactory?");
			} catch (IllegalAccessException e) {
				throw new RuntimeException(e);
			}
		}
		return tempFactory;
	}
	
	/**
	 * Creates a default HDT
	 * 
	 * @return HDT
	 */
	public static HDT createHDT() {
		return new HDTImpl(new HDTSpecification());
	}

	/**
	 * Creates an HDT with the specified spec
	 * 
	 * @return HDT
	 */
	public static HDT createHDT(HDTOptions spec) {
		return new HDTImpl(spec);
	}
	
	/**
	 * Creates a TempHDT with the specified spec, baseUri and ModeOfLoading.
	 * 
	 * ModeOfLoading can be null if the TempHDT is not meant to be populated from RDF
	 * (i.e. ModHDTImporter object not used).
	 * 
	 * @return TempHDT
	 */
	public static TempHDT createTempHDT(HDTSpecification spec, String baseUri, ModeOfLoading modeOfLoading) {
		return new TempHDTImpl(spec, baseUri, modeOfLoading);
	}
}