DateFormatter


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.springframework.binding.format.support;
17  
18  import java.text.DateFormat  ;
19  import java.text.ParseException  ;
20  import java.util.Date  ;
21  
22  import org.springframework.binding.format.InvalidFormatException;
23  
24  /**
25   * Formatter that formats date objects.
26   * @author Keith Donald
27   */
28  public class DateFormatter extends AbstractFormatter {
29  
30      private DateFormat   dateFormat;
31  
32      /**
33       * Constructs a date formatter that will delegate to the specified date
34       * format.
35       * @param dateFormat
36       */
37      public DateFormatter(DateFormat   dateFormat) {
38          super();
39          this.dateFormat = dateFormat;
40      }
41  
42      /**
43       * Constructs a date formatter that will delegate to the specified date
44       * format.
45       * @param dateFormat
46       * @param allowEmpty should this formatter allow empty input arguments?
47       */
48      public DateFormatter(DateFormat   dateFormat, boolean allowEmpty) {
49          super(allowEmpty);
50          this.dateFormat = dateFormat;
51      }
52  
53      // convert from date to string
54      protected String   doFormatValue(Object   date) {
55          return dateFormat.format((Date  )date);
56      }
57  
58      // convert back from string to date
59      protected Object   doParseValue(String   formattedString, Class   targetClass) throws ParseException   {
60          return dateFormat.parse(formattedString);
61      }
62  
63      public Date   parseDate(String   formattedString) throws InvalidFormatException {
64          return (Date  )parseValue(formattedString, Date  .class);
65      }
66  }
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