TypeProperty


1   package net.sourceforge.pmd.properties;
2   
3   import net.sourceforge.pmd.util.ClassUtil;
4   
5   
6   /**
7    * Defines a property that supports class types, even for primitive values!
8    * 
9    * @author Brian Remedios
10   * @version $Revision$
11   */
12  public class TypeProperty extends StringProperty {
13      
14      private static final char delimiter = '|';
15      
16      /**
17       * Constructor for TypeProperty.
18       * @param theName String
19       * @param theDescription String
20       * @param theDefault Class
21       * @param theUIOrder float
22       */
23      public TypeProperty(String   theName, String   theDescription, Class   theDefault, float theUIOrder) {
24          super(theName, theDescription, theDefault, theUIOrder, delimiter);
25          
26          maxValueCount(1);
27      }
28  
29      /**
30       * Constructor for TypeProperty.
31       * @param theName String
32       * @param theDescription String
33       * @param theDefaults Class[]
34       * @param theUIOrder float
35       */
36      public TypeProperty(String   theName, String   theDescription, Class  [] theDefaults, float theUIOrder) {
37          super(theName, theDescription, theDefaults, theUIOrder, delimiter);
38          
39          maxValueCount(Integer.MAX_VALUE);
40      }
41      
42      /**
43       * Method type.
44       * @return Class
45       * @see net.sourceforge.pmd.PropertyDescriptor#type()
46       */
47      public Class   type() {
48          return Class  .class;
49      }
50  
51      /**
52       * Method asString.
53       * @param value Object
54       * @return String
55       */
56      protected String   asString(Object   value) {
57          return value == null ? "" : ((Class  )value).getName();
58      }
59      
60      /**
61       * Method classFrom.
62       * @param className String
63       * @return Class
64       */
65      private Class   classFrom(String   className) {
66          
67          Class   cls = ClassUtil.getTypeFor(className);
68          if (cls != null) return cls;
69          
70          try {
71              return Class.forName(className);
72              } catch (Exception   ex) {
73                  throw new IllegalArgumentException  (className);
74                  }
75      }
76      
77      /**
78       * Method valueFrom.
79       * @param valueString String
80       * @return Object
81       * @see net.sourceforge.pmd.PropertyDescriptor#valueFrom(String)
82       */
83      public Object   valueFrom(String   valueString) {
84          
85          if (maxValueCount() == 1) return classFrom(valueString);
86          
87          String  [] values = (String  [])super.valueFrom(valueString);
88          
89          Class  [] classes = new Class  [values.length];
90          for (int i=0; i<values.length; i++) classes[i] = classFrom(values[i]);
91          return classes;
92      }
93      
94      /**
95       * Neutralize unwanted superclass functionality that will result 
96       * in a class cast exception.
97       * 
98       * @param value Object
99       * @return String
100      */
101     protected String   valueErrorFor(Object   value) {      
102         return null;
103     }
104 }
105
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