1   /**
2    * Distribution License:
3    * This is free software; you can redistribute it and/or modify it under
4    * the terms of the GNU Lesser General Public License, version 2.1 as published
5    * by the Free Software Foundation. This program is distributed in the hope
6    * that it will be useful, but WITHOUT ANY WARRANTY; without even the
7    * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
8    * See the GNU Lesser General Public License for more details.
9    *
10   * The License is available on the internet at:
11   *       http://www.gnu.org/copyleft/llgpl.html
12   * or by writing to:
13   *      Free Software Foundation, Inc.
14   *      59 Temple Place - Suite 330
15   *      Boston, MA 02111-1307, USA
16   *
17   * Copyright: 2005
18   *     The copyright to this program is held by it's authors.
19   *
20   * ID: $Id: ChoiceFactory.java 2090 2011-03-07 04:13:05Z dmsmith $
21   */
22  package org.crosswire.common.config;
23  
24  import java.util.HashMap;
25  import java.util.Map;
26  import java.util.ResourceBundle;
27  
28  import org.crosswire.common.util.ClassUtil;
29  import org.crosswire.common.util.PluginUtil;
30  import org.jdom.Element;
31  
32  /**
33   * Factory for the well known Choices.
34   * 
35   * @see gnu.lgpl.License for license details.<br>
36   *      The copyright to this program is held by it's authors.
37   * @author Joe Walker [joe at eireneh dot com]
38   */
39  public final class ChoiceFactory {
40      /**
41       * Prevent instantiation
42       */
43      private ChoiceFactory() {
44      }
45  
46      /**
47       * Get a ChoiceFactory by element.
48       * 
49       * @param option
50       *            The element to check
51       * @return One of the ChoiceTypes.
52       */
53      public static Choice getChoice(Element option, ResourceBundle configResources) throws ClassNotFoundException, IllegalAccessException,
54              InstantiationException, StartupException
55      {
56          Class<Choice> clazz = null;
57  
58          String type = option.getAttributeValue("type");
59          if ("custom".equals(type)) {
60              String clazzstr = option.getAttributeValue("class");
61              clazz = (Class<Choice>) ClassUtil.forName(clazzstr);
62          } else {
63              clazz = map.get(type);
64          }
65  
66          Choice choice = clazz.newInstance();
67          choice.init(option, configResources);
68          return choice;
69      }
70  
71      /**
72       * Method getDataMap.
73       */
74      public static Map<String, Object> getDataMap() {
75          return datamap;
76      }
77  
78      /**
79       * Storage of various registered objects
80       */
81      private static Map<String, Object> datamap = new HashMap<String, Object>();
82  
83      /**
84       * Store of the known ChoiceTypes
85       */
86      private static Map<String, Class<Choice>> map;
87  
88      /**
89       * Setup the map of Choices
90       */
91      static {
92          map = PluginUtil.getImplementorsMap(Choice.class);
93      }
94  }
95