MinValidator


1   //$Id: MinValidator.java,v 1.1 2005/05/27 08:58:54 epbernard Exp $
2   package org.hibernate.validator;
3   
4   import org.hibernate.mapping.Column;
5   import org.hibernate.mapping.Property;
6   
7   /**
8    * Do check a min restriction on a numeric (whether and actual number or its string representation,
9    * and apply expected contraints on hibernate metadata.
10   *
11   * @author Gavin King
12   */
13  public class MinValidator implements Validator<Min>, PropertyConstraint  {
14      
15      private int min;
16      
17      public void initialize(Min parameters) {
18          min = parameters.value();
19      }
20  
21      public boolean isValid(Object   value) {
22          if (value==null) return true;
23          if (value instanceof String  ) {
24              try {
25                  double dv = Double.parseDouble( (String  ) value );
26                  return dv>=min;
27              }
28              catch (NumberFormatException   nfe) {
29                  return false;
30              }
31          }
32          else if ( (value instanceof Double  ) || (value instanceof Float  ) ) {
33              double dv = ( (Number  ) value ).doubleValue();
34              return dv>=min;
35          }
36          else if (value instanceof Number  ) {
37              long lv = ( (Number  ) value ).longValue();
38              return lv>=min;
39          }
40          else {
41              return false;
42          }
43      }
44  
45      public void apply(Property property) {
46          Column col = (Column) property.getColumnIterator().next();
47          col.setCheckConstraint( col.getName() + ">=" + min );
48      }
49  }
50
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