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 
23 
24 /**
25  * Represents a <code>Content-Transfer-Encoding</code> field.
26  *
27  *
28  * @version $Id: ContentTransferEncodingField.java,v 1.2 2004/10/02 12:41:11 ntherning Exp $
29  */
30 public class ContentTransferEncodingField extends Field {
31     /**
32      * The <code>7bit</code> encoding.
33      */
34     public static final String ENC_7BIT = "7bit";
35     /**
36      * The <code>8bit</code> encoding.
37      */
38     public static final String ENC_8BIT = "8bit";
39     /**
40      * The <code>binary</code> encoding.
41      */
42     public static final String ENC_BINARY = "binary";
43     /**
44      * The <code>quoted-printable</code> encoding.
45      */
46     public static final String ENC_QUOTED_PRINTABLE = "quoted-printable";
47     /**
48      * The <code>base64</code> encoding.
49      */
50     public static final String ENC_BASE64 = "base64";
51 
52     private String encoding;
53 
ContentTransferEncodingField(String name, String body, String raw, String encoding)54     protected ContentTransferEncodingField(String name, String body, String raw, String encoding) {
55         super(name, body, raw);
56         this.encoding = encoding;
57     }
58 
59     /**
60      * Gets the encoding defined in this field.
61      *
62      * @return the encoding or an empty string if not set.
63      */
getEncoding()64     public String getEncoding() {
65         return encoding;
66     }
67 
68     /**
69      * Gets the encoding of the given field if. Returns the default
70      * <code>7bit</code> if not set or if
71      * <code>f</code> is <code>null</code>.
72      *
73      * @return the encoding.
74      */
getEncoding(ContentTransferEncodingField f)75     public static String getEncoding(ContentTransferEncodingField f) {
76         if (f != null && f.getEncoding().length() != 0) {
77             return f.getEncoding();
78         }
79         return ENC_7BIT;
80     }
81 
82     public static class Parser implements FieldParser {
parse(final String name, final String body, final String raw)83         public Field parse(final String name, final String body, final String raw) {
84             final String encoding = body.trim().toLowerCase();
85             return new ContentTransferEncodingField(name, body, raw, encoding);
86         }
87     }
88 }
89