001    /****************************************************************
002     * Licensed to the Apache Software Foundation (ASF) under one   *
003     * or more contributor license agreements.  See the NOTICE file *
004     * distributed with this work for additional information        *
005     * regarding copyright ownership.  The ASF licenses this file   *
006     * to you under the Apache License, Version 2.0 (the            *
007     * "License"); you may not use this file except in compliance   *
008     * with the License.  You may obtain a copy of the License at   *
009     *                                                              *
010     *   http://www.apache.org/licenses/LICENSE-2.0                 *
011     *                                                              *
012     * Unless required by applicable law or agreed to in writing,   *
013     * software distributed under the License is distributed on an  *
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015     * KIND, either express or implied.  See the License for the    *
016     * specific language governing permissions and limitations      *
017     * under the License.                                           *
018     ****************************************************************/
019    
020    package org.apache.james.mime4j.field;
021    
022    import java.io.StringReader;
023    import java.util.Date;
024    
025    import org.apache.james.mime4j.codec.DecodeMonitor;
026    import org.apache.james.mime4j.dom.FieldParser;
027    import org.apache.james.mime4j.dom.field.DateTimeField;
028    import org.apache.james.mime4j.field.datetime.parser.DateTimeParser;
029    import org.apache.james.mime4j.field.datetime.parser.ParseException;
030    import org.apache.james.mime4j.field.datetime.parser.TokenMgrError;
031    import org.apache.james.mime4j.stream.Field;
032    
033    /**
034     * Date-time field such as <code>Date</code> or <code>Resent-Date</code>.
035     */
036    public class DateTimeFieldImpl extends AbstractField implements DateTimeField {
037        private boolean parsed = false;
038    
039        private Date date;
040        private ParseException parseException;
041    
042        DateTimeFieldImpl(Field rawField, DecodeMonitor monitor) {
043            super(rawField, monitor);
044        }
045    
046        /**
047         * @see org.apache.james.mime4j.dom.field.DateTimeField#getDate()
048         */
049        public Date getDate() {
050            if (!parsed)
051                parse();
052    
053            return date;
054        }
055    
056        /**
057         * @see org.apache.james.mime4j.dom.field.DateTimeField#getParseException()
058         */
059        @Override
060        public ParseException getParseException() {
061            if (!parsed)
062                parse();
063    
064            return parseException;
065        }
066    
067        private void parse() {
068            String body = getBody();
069    
070            try {
071                date = new DateTimeParser(new StringReader(body)).parseAll()
072                        .getDate();
073            } catch (ParseException e) {
074                parseException = e;
075            } catch (TokenMgrError e) {
076                parseException = new ParseException(e.getMessage());
077            }
078    
079            parsed = true;
080        }
081    
082        public static final FieldParser<DateTimeField> PARSER = new FieldParser<DateTimeField>() {
083    
084            public DateTimeField parse(final Field rawField, final DecodeMonitor monitor) {
085                return new DateTimeFieldImpl(rawField, monitor);
086            }
087    
088        };
089    }