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.text.ParseException;
023 import java.text.SimpleDateFormat;
024 import java.util.ArrayList;
025 import java.util.Collection;
026 import java.util.Date;
027 import java.util.List;
028 import java.util.Locale;
029 import java.util.TimeZone;
030
031 import org.apache.james.mime4j.codec.DecodeMonitor;
032 import org.apache.james.mime4j.dom.FieldParser;
033 import org.apache.james.mime4j.dom.field.DateTimeField;
034 import org.apache.james.mime4j.stream.Field;
035
036 /**
037 * Date-time field such as <code>Date</code> or <code>Resent-Date</code>.
038 */
039 public class DateTimeFieldLenientImpl extends AbstractField implements DateTimeField {
040
041 private static final String[] DEFAULT_DATE_FORMATS = {
042 "EEE, dd MMM yyyy HH:mm:ss ZZZZ",
043 "dd MMM yyyy HH:mm:ss ZZZZ"};
044
045 private final List<String> datePatterns;
046
047 private boolean parsed = false;
048 private Date date;
049
050 DateTimeFieldLenientImpl(final Field rawField,
051 final Collection<String> dateParsers, final DecodeMonitor monitor) {
052 super(rawField, monitor);
053 this.datePatterns = new ArrayList<String>();
054 if (dateParsers != null) {
055 this.datePatterns.addAll(dateParsers);
056 } else {
057 for (String pattern: DEFAULT_DATE_FORMATS) {
058 this.datePatterns.add(pattern);
059 }
060 }
061 }
062
063 public Date getDate() {
064 if (!parsed) {
065 parse();
066 }
067 return date;
068 }
069
070 private void parse() {
071 parsed = true;
072 date = null;
073 String body = getBody();
074 for (String datePattern: datePatterns) {
075 try {
076 SimpleDateFormat parser = new SimpleDateFormat(datePattern, Locale.US);
077 parser.setTimeZone(TimeZone.getTimeZone("GMT"));
078 parser.setLenient(true);
079 date = parser.parse(body);
080 break;
081 } catch (ParseException ignore) {
082 }
083 }
084 }
085
086 public static final FieldParser<DateTimeField> PARSER = new FieldParser<DateTimeField>() {
087
088 public DateTimeField parse(final Field rawField, final DecodeMonitor monitor) {
089 return new DateTimeFieldLenientImpl(rawField, null, monitor);
090 }
091
092 };
093
094 public static FieldParser<DateTimeField> createParser(final Collection<String> dateParsers) {
095
096 return new FieldParser<DateTimeField>() {
097
098 public DateTimeField parse(final Field rawField, final DecodeMonitor monitor) {
099 return new DateTimeFieldLenientImpl(rawField, dateParsers, monitor);
100 }
101
102 };
103
104 }
105
106 }