01: /*
02: * This file is part of the Echo Web Application Framework (hereinafter "Echo").
03: * Copyright (C) 2002-2005 NextApp, Inc.
04: *
05: * Version: MPL 1.1/GPL 2.0/LGPL 2.1
06: *
07: * The contents of this file are subject to the Mozilla Public License Version
08: * 1.1 (the "License"); you may not use this file except in compliance with
09: * 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;
33: import java.text.StringCharacterIterator;
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 clean(String source,
52: int wordLengthLimit, int lengthLimit) {
53: if (source == null) {
54: return null;
55: }
56: StringBuffer out = new StringBuffer();
57: CharacterIterator ci = new StringCharacterIterator(source);
58: int wordLength = 0;
59: int textLength = 0;
60: char ch = ci.first();
61: while (ch != CharacterIterator.DONE) {
62: if (lengthLimit > 0) {
63: if (textLength > lengthLimit) {
64: out.append("...");
65: break;
66: }
67: ++textLength;
68: }
69: if (wordLengthLimit > 0) {
70: if (Character.isWhitespace(ch)) {
71: wordLength = 0;
72: } else {
73: ++wordLength;
74: }
75: if (wordLength > wordLengthLimit) {
76: wordLength = 0;
77: out.append(" ");
78: }
79: }
80: if (ch >= 0x20) {
81: out.append(ch);
82: }
83: ch = ci.next();
84: }
85: return out.toString();
86: }
87:
88: /** Non-instantiable class. */
89: private MessageUtil() {
90: }
91: }
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