WebWorkTypeConverter


1   package com.opensymphony.webwork.util;
2   
3   import ognl.DefaultTypeConverter;
4   
5   import java.util.Map  ;
6   
7   /**
8    * Base class for type converters used in WebWork. This class provides two abstract
9    * methods that are used to convert both to and from strings -- the critical
10   * functionality that is core to WebWork's type coversion system.
11   * <p/>
12   * Type converts do not have to use this class. It is merely a helper
13   * base class.
14   */
15  public abstract class WebWorkTypeConverter extends DefaultTypeConverter {
16      public Object   convertValue(Map   context, Object   o, Class   toClass) {
17          if (toClass.equals(String  .class)) {
18              return convertToString(context, o);
19          } else if (o instanceof String  []) {
20              return convertFromString(context, (String  []) o, toClass);
21          } else if (o instanceof String  ) {
22              return convertFromString(context, new String  []{(String  ) o}, toClass);
23          } else {
24              return super.convertValue(context, o, toClass);
25          }
26      }
27  
28      /**
29       * Converts one or more String values to the specified class.
30       *
31       * @param context the action context
32       * @param values  the String values to be converted, such as those submitted from an HTML form
33       * @param toClass the class to convert to
34       * @return the converted object
35       */
36      public abstract Object   convertFromString(Map   context, String  [] values, Class   toClass);
37  
38      /**
39       * Converts the specified object to a String.
40       *
41       * @param context the action context
42       * @param o       the object to be converted
43       * @return the converted String
44       */
45      public abstract String   convertToString(Map   context, Object   o);
46  }
47
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