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 writeLine(line, false);
46 }
47
48 /**
49 * Write line with or without continuation prefix.
50 *
51 * @param line line content
52 * @param prefix continuation flag
53 */
54 public void writeLine(String line, boolean prefix) {
55 int maxLength = 77;
56 if (prefix) {
57 maxLength--;
58 buffer.append(' ');
59 }
60 if (line.length() > maxLength) {
61 buffer.append(line, 0, maxLength);
62 newLine();
63 writeLine(line.substring(maxLength), true);
64 } else {
65 buffer.append(line);
66 newLine();
67 }
68 }
69
70 /**
71 * Append CRLF.
72 */
73 public void newLine() {
74 buffer.append((char) 13).append((char) 10);
75 }
76
77 /**
78 * Get buffer as String
79 *
80 * @return ICS content as String
81 */
82 @Override
83 public String toString() {
84 return buffer.toString();
85 }
86
87 /**
88 * Append single value property
89 *
90 * @param propertyName property name
91 * @param propertyValue property value
92 */
93 public void appendProperty(String propertyName, String propertyValue) {
94 if ((propertyValue != null) && (propertyValue.length() > 0)) {
95 StringBuilder lineBuffer = new StringBuilder();
96 lineBuffer.append(propertyName);
97 lineBuffer.append(':');
98 appendMultilineEncodedValue(lineBuffer, propertyValue);
99 writeLine(lineBuffer.toString());
100 }
101
102 }
103
104 /**
105 * Append and encode \n to \\n in value.
106 *
107 * @param buffer line buffer
108 * @param value value
109 */
110 protected void appendMultilineEncodedValue(StringBuilder buffer, String value) {
111 for (int i = 0; i < value.length(); i++) {
112 char c = value.charAt(i);
113 if (c == '\n') {
114 buffer.append("\\n");
115 // skip carriage return
116 } else if (c != '\r') {
117 buffer.append(value.charAt(i));
118 }
119 }
120 }
121
122 }