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Java > Open Source Codes > echo2example > email > MessageUtil


1 /*
2  * This file is part of the Echo Web Application Framework (hereinafter "Echo").
3  * Copyright (C) 2002-2005 NextApp, Inc.
4  *
5  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6  *
7  * The contents of this file are subject to the Mozilla Public License Version
8  * 1.1 (the "License"); you may not use this file except in compliance with
9  * the License. You may obtain a copy of the License at
10  * http://www.mozilla.org/MPL/
11  *
12  * Software distributed under the License is distributed on an "AS IS" basis,
13  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14  * for the specific language governing rights and limitations under the
15  * License.
16  *
17  * Alternatively, the contents of this file may be used under the terms of
18  * either the GNU General Public License Version 2 or later (the "GPL"), or
19  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
20  * in which case the provisions of the GPL or the LGPL are applicable instead
21  * of those above. If you wish to allow use of your version of this file only
22  * under the terms of either the GPL or the LGPL, and not to allow others to
23  * use your version of this file under the terms of the MPL, indicate your
24  * decision by deleting the provisions above and replace them with the notice
25  * and other provisions required by the GPL or the LGPL. If you do not delete
26  * the provisions above, a recipient may use your version of this file under
27  * the terms of any one of the MPL, the GPL or the LGPL.
28  */
29
30 package echo2example.email;
31
32 import java.text.CharacterIterator JavaDoc;
33 import java.text.StringCharacterIterator JavaDoc;
34
35 /**
36  * Utilities for rendering e-mail content.
37  */
38 public class MessageUtil {
39
40     /**
41      * Remove control characters from SPAM messages.
42      *
43      * @param source the source text
44      * @param wordLengthLimit the maximum length of a word (words longer
45      * than this length will have spaces inserted; negative values
46      * indicate unlimited length)
47      * @param lengthLimit Maximum length of text (text longer than this
48      * length will be cut; negative values indicate unlimited length)
49      * @return the translated string
50      */
51     public static final String JavaDoc clean(String JavaDoc source, int wordLengthLimit, int lengthLimit) {
52         if (source == null) {
53             return null;
54         }
55         StringBuffer JavaDoc out = new StringBuffer JavaDoc();
56         CharacterIterator JavaDoc ci = new StringCharacterIterator JavaDoc(source);
57         int wordLength = 0;
58         int textLength = 0;
59         char ch = ci.first();
60         while (ch != CharacterIterator.DONE) {
61             if (lengthLimit > 0) {
62                 if (textLength > lengthLimit) {
63                     out.append("...");
64                     break;
65                 }
66                 ++textLength;
67             }
68             if (wordLengthLimit > 0) {
69                 if (Character.isWhitespace(ch)) {
70                     wordLength = 0;
71                 } else {
72                     ++wordLength;
73                 }
74                 if (wordLength > wordLengthLimit) {
75                     wordLength = 0;
76                     out.append(" ");
77                 }
78             }
79             if (ch >= 0x20) {
80                 out.append(ch);
81             }
82             ch = ci.next();
83         }
84         return out.toString();
85     }
86
87     /** Non-instantiable class. */
88     private MessageUtil() { }
89 }
90
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