View Javadoc

1   /****************************************************************
2    * Licensed to the Apache Software Foundation (ASF) under one   *
3    * or more contributor license agreements.  See the NOTICE file *
4    * distributed with this work for additional information        *
5    * regarding copyright ownership.  The ASF licenses this file   *
6    * to you under the Apache License, Version 2.0 (the            *
7    * "License"); you may not use this file except in compliance   *
8    * with the License.  You may obtain a copy of the License at   *
9    *                                                              *
10   *   http://www.apache.org/licenses/LICENSE-2.0                 *
11   *                                                              *
12   * Unless required by applicable law or agreed to in writing,   *
13   * software distributed under the License is distributed on an  *
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
15   * KIND, either express or implied.  See the License for the    *
16   * specific language governing permissions and limitations      *
17   * under the License.                                           *
18   ****************************************************************/
19  
20  package org.apache.james.mime4j.field;
21  
22  import java.io.StringReader;
23  import java.util.Date;
24  
25  import org.apache.commons.logging.Log;
26  import org.apache.commons.logging.LogFactory;
27  import org.apache.james.mime4j.field.datetime.parser.DateTimeParser;
28  import org.apache.james.mime4j.field.datetime.parser.ParseException;
29  import org.apache.james.mime4j.field.datetime.parser.TokenMgrError;
30  import org.apache.james.mime4j.util.ByteSequence;
31  
32  /**
33   * Date-time field such as <code>Date</code> or <code>Resent-Date</code>.
34   */
35  public class DateTimeField extends AbstractField {
36      private static Log log = LogFactory.getLog(DateTimeField.class);
37  
38      private boolean parsed = false;
39  
40      private Date date;
41      private ParseException parseException;
42  
43      DateTimeField(String name, String body, ByteSequence raw) {
44          super(name, body, raw);
45      }
46  
47      public Date getDate() {
48          if (!parsed)
49              parse();
50  
51          return date;
52      }
53  
54      @Override
55      public ParseException getParseException() {
56          if (!parsed)
57              parse();
58  
59          return parseException;
60      }
61  
62      private void parse() {
63          String body = getBody();
64  
65          try {
66              date = new DateTimeParser(new StringReader(body)).parseAll()
67                      .getDate();
68          } catch (ParseException e) {
69              if (log.isDebugEnabled()) {
70                  log.debug("Parsing value '" + body + "': " + e.getMessage());
71              }
72              parseException = e;
73          } catch (TokenMgrError e) {
74              if (log.isDebugEnabled()) {
75                  log.debug("Parsing value '" + body + "': " + e.getMessage());
76              }
77              parseException = new ParseException(e.getMessage());
78          }
79  
80          parsed = true;
81      }
82  
83      static final FieldParser PARSER = new FieldParser() {
84          public ParsedField parse(final String name, final String body,
85                  final ByteSequence raw) {
86              return new DateTimeField(name, body, raw);
87          }
88      };
89  }