    1   /* $Id: GeneratorFactory.java 4417 2006-08-02 01:12:00Z stack-sf $
    2    *
    3    * Created on July 27th, 2006
    4    *
    5    * Copyright (C) 2006 Internet Archive.
    6    *
    7    * This file is part of the Heritrix web crawler (crawler.archive.org).
    8    *
    9    * Heritrix is free software; you can redistribute it and/or modify
    10   * it under the terms of the GNU Lesser Public License as published by
    11   * the Free Software Foundation; either version 2.1 of the License, or
    12   * any later version.
    13   *
    14   * Heritrix is distributed in the hope that it will be useful,
    15   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17   * GNU Lesser Public License for more details.
    18   *
    19   * You should have received a copy of the GNU Lesser Public License
    20   * along with Heritrix; if not, write to the Free Software
    21   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    22   */
    23  package org.archive.uid;
    24
    25  import java.net.URI;
    26  import java.net.URISyntaxException;
    27  import java.util.Map;
    28
    29  /***
    30   * Factory that generates uids.
    31   * Singleton.  Default implementation is {@link UUIDGenerator}. To
    32   * change, specify alternate implementation of {@link Generator} with
    33   * {@link #SYSTEM_PROPERTY_GENERATOR_KEY} system property.
    34   * @author stack
    35   * @version $Revision: 4417 $ $Date: 2006-08-02 01:12:00 +0000 (Wed, 02 Aug 2006) $
    36   */
    37  public class GeneratorFactory implements Generator {
    38  	public final String SYSTEM_PROPERTY_GENERATOR_KEY =
    39  		this.getClass().toString() + ".generator";
    40  	private static final String DEFAULT_GENERATOR =
    41  		"org.archive.uid.UUIDGenerator";
    42  	private static final GeneratorFactory factory = new GeneratorFactory();
    43  	private final Generator generator;
    44
    45  	private GeneratorFactory() {
    46  		super();
    47  		String className = System.getProperty(SYSTEM_PROPERTY_GENERATOR_KEY,
    48  			DEFAULT_GENERATOR);
    49  		Generator ridg = null;
    50  		try {
    51  			Class c = Class.forName(className);
    52  			ridg = (Generator) c.newInstance();
    53  		} catch (Exception e) {
    54  			e.printStackTrace();
    55  		}
    56  		this.generator = ridg;
    57  	}
    58
    59  	public URI getRecordID() throws URISyntaxException {
    60  		return this.generator.getRecordID();
    61  	}
    62
    63  	public URI getQualifiedRecordID(Map<String, String> qualifiers)
    64  	throws URISyntaxException {
    65  		return this.generator.getQualifiedRecordID(qualifiers);
    66  	}
    67
    68  	public URI getQualifiedRecordID(String key, String value)
    69  	throws URISyntaxException {
    70  		return this.generator.getQualifiedRecordID(key, value);
    71  	}
    72
    73  	public URI qualifyRecordID(final URI uri,
    74  			final Map<String, String> qualifiers)
    75  	throws URISyntaxException {
    76  		return this.generator.qualifyRecordID(uri, qualifiers);
    77  	}
    78
    79  	public static GeneratorFactory getFactory() {
    80  		return factory;
    81  	}
    82  }