JdtConverterManager


1   // Copyright (c) 2003-2007, Jodd Team (jodd.sf.net). All Rights Reserved.
2   
3   package jodd.datetime;
4   
5   import jodd.datetime.converter.*;
6   
7   import java.util.Map  ;
8   import java.util.HashMap  ;
9   import java.util.Iterator  ;
10  import java.util.Calendar  ;
11  
12  /**
13   * Manager for {@link JdtConverter} instances.
14   * @see #registerDefaults()
15   */
16  public class JdtConverterManager {
17  
18      // ---------------------------------------------------------------- manager
19  
20      private static Map   converters = new HashMap  ();
21  
22      static {
23          registerDefaults();
24      }
25  
26      /**
27       * Unregister all converters.
28       */
29      public static void unregisterAll() {
30          converters.clear();
31      }
32  
33  
34      /**
35       * Registers default set of converters.
36       * @see #register(Class, jodd.datetime.converter.JdtConverter)
37       */
38      public static void registerDefaults() {
39          register(DateTimeStamp.class, new DateTimeStampConverter());
40          register(Calendar  .class, new CalendarConverter());
41          register(java.util.GregorianCalendar  .class, new GregorianCalendarConverter());
42          register(java.util.Date  .class, new DateConverter());
43          register(java.sql.Date  .class, new SqlDateConverter());
44          register(java.sql.Timestamp  .class, new SqlTimestampConverter());
45      }
46  
47      /**
48       * Registers converter for an objects of specific type.
49  
50       * @see #registerDefaults() 
51       */
52      public static void register(Class   type, JdtConverter converter) {
53          converters.put(type, converter);
54      }
55  
56      public static void unregister(Class   type) {
57          converters.remove(type);
58      }
59  
60  
61      // ---------------------------------------------------------------- lookup
62  
63  
64      /**
65       * Returns converter for the specific object type.
66       * @return converter instance, <code>null</code> if nothing found.
67       */
68      public static JdtConverter lookup(Class   type) {
69          return (JdtConverter) converters.get(type);
70      }
71  
72      /**
73       * Performs more throughly search for converter loader. It examines all available
74       * converters and returns the first that matches the object type.
75       */
76      public static JdtConverter lookup(Object   source) {
77          JdtConverter converter = lookup(source.getClass());
78          if (converter == null) {                    // class not found, scan for instanceof matching
79              Iterator   it = converters.keySet().iterator();
80              while (it.hasNext()) {
81                  Class   key = (Class  ) it.next();
82                  if (key.isInstance(source)) {
83                      converter = lookup(key);
84                      break;
85                  }
86              }
87          }
88          return converter;
89      }
90  
91  }
92
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