CharacterHandler


1   /***************************************
2    *                                     *
3    *  JBoss: The OpenSource J2EE WebOS   *
4    *                                     *
5    *  Distributable under LGPL license.  *
6    *  See terms of license at gnu.org.   *
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8    ***************************************/
9   
10  package org.jboss.util.coerce;
11  
12  import org.jboss.util.CoercionException;
13  import org.jboss.util.NotCoercibleException;
14  
15  /**
16   * A Character coercion handler.
17   *
18   * @version <tt>$Revision: 1.1 $</tt>
19   * @author  <a HREF="mailto:jason@planet57.com">Jason Dillon</a>
20   */
21  public class CharacterHandler
22     extends BoundCoercionHandler
23  {
24     /**
25      * Get the target class type for this CoercionHandler.
26      *
27      * @return     Class type
28      */
29     public Class   getType() {
30        return Character  .class;
31     }
32  
33     /**
34      * Coerces the given value into the given type (which should be
35      * Character.class).
36      *
37      * <p>This currently only support coercion from a String.
38      *
39      * @param value   Value to coerce
40      * @param type    Character.class
41      * @return        Value coerced into a Character
42      *
43      * @throws CoercionException  Failed to coerce
44      */
45     public Object   coerce(Object   value, Class   type) throws CoercionException {
46        if (value.getClass().equals(String  .class)) {
47           return coerce((String  )value);
48        }
49        
50        throw new NotCoercibleException(value);
51     }
52  
53     /**
54      * Coerces the given string into a Character, by taking off the first
55      * index of the string and wrapping it.
56      *
57      * @param value   String value to convert to a Character
58      * @return        Character value or null if the string is empty.
59      */
60     public Object   coerce(String   value) {
61        char[] temp = value.toCharArray();
62        if (temp.length == 0) {
63           return null;
64        }
65        return new Character  (temp[0]);
66     }
67  }
68  
69
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