1 /*
2 * DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
3 * Copyright (C) 2009 Mickael Guessant
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 */
19 package davmail.exchange;
20
21 /**
22 * ICS String writer.
23 * split lines longer than 75 characters
24 */
25 public class ICSBufferedWriter {
26 final StringBuilder buffer = new StringBuilder();
27
28 /**
29 * Write content to buffer, do not split lines.
30 *
31 * @param content ics content
32 */
33 public void write(String content) {
34 if (content != null) {
35 buffer.append(content);
36 }
37 }
38
39 /**
40 * Write line to buffer, split lines at 75 characters.
41 *
42 * @param line ics event line
43 */
44 public void writeLine(String line) {
45 int maxLength = 77;
46 if (line.length() <= maxLength) {
47 buffer.append(line);
48 newLine();
49 return;
50 }
51
52 // first chunk, no space prefix
53 buffer.append(line, 0, maxLength);
54 newLine();
55 int offset = maxLength;
56
57 // continuation lines, prefixed with space
58 maxLength--;
59 while (offset < line.length()) {
60 buffer.append(' ');
61 int end = Math.min(offset + maxLength, line.length());
62 buffer.append(line, offset, end);
63 newLine();
64 offset = end;
65 }
66 }
67
68 /**
69 * Append CRLF.
70 */
71 public void newLine() {
72 buffer.append((char) 13).append((char) 10);
73 }
74
75 /**
76 * Get buffer as String
77 *
78 * @return ICS content as String
79 */
80 @Override
81 public String toString() {
82 return buffer.toString();
83 }
84
85 /**
86 * Append single value property
87 *
88 * @param propertyName property name
89 * @param propertyValue property value
90 */
91 public void appendProperty(String propertyName, String propertyValue) {
92 if ((propertyValue != null) && (!propertyValue.isEmpty())) {
93 StringBuilder lineBuffer = new StringBuilder();
94 lineBuffer.append(propertyName);
95 lineBuffer.append(':');
96 appendMultilineEncodedValue(lineBuffer, propertyValue);
97 writeLine(lineBuffer.toString());
98 }
99
100 }
101
102 /**
103 * Append and encode \n to \\n in value.
104 *
105 * @param buffer line buffer
106 * @param value value
107 */
108 protected void appendMultilineEncodedValue(StringBuilder buffer, String value) {
109 for (int i = 0; i < value.length(); i++) {
110 char c = value.charAt(i);
111 if (c == '\n') {
112 buffer.append("\\n");
113 // skip carriage return
114 } else if (c != '\r') {
115 buffer.append(value.charAt(i));
116 }
117 }
118 }
119
120 }