123 lines
3.5 KiB
Java
123 lines
3.5 KiB
Java
/*
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* DavMail POP/IMAP/SMTP/CalDav/LDAP Exchange Gateway
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* Copyright (C) 2009 Mickael Guessant
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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package davmail.exchange;
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/**
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* ICS String writer.
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* split lines longer than 75 characters
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*/
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public class ICSBufferedWriter {
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final StringBuilder buffer = new StringBuilder();
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/**
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* Write content to buffer, do not split lines.
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*
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* @param content ics content
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*/
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public void write(String content) {
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if (content != null) {
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buffer.append(content);
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}
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}
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/**
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* Write line to buffer, split lines at 75 characters.
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*
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* @param line ics event line
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*/
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public void writeLine(String line) {
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writeLine(line, false);
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}
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/**
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* Write line with or without continuation prefix.
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*
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* @param line line content
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* @param prefix continuation flag
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*/
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public void writeLine(String line, boolean prefix) {
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int maxLength = 77;
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if (prefix) {
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maxLength--;
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buffer.append(' ');
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}
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if (line.length() > maxLength) {
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buffer.append(line.substring(0, maxLength));
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newLine();
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writeLine(line.substring(maxLength), true);
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} else {
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buffer.append(line);
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newLine();
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}
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}
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/**
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* Append CRLF.
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*/
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public void newLine() {
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buffer.append((char) 13).append((char) 10);
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}
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/**
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* Get buffer as String
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*
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* @return ICS content as String
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*/
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@Override
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public String toString() {
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return buffer.toString();
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}
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/**
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* Append single value property
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*
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* @param propertyName property name
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* @param propertyValue property value
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*/
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public void appendProperty(String propertyName, String propertyValue) {
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if ((propertyValue != null) && (propertyValue.length() > 0)) {
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StringBuilder lineBuffer = new StringBuilder();
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lineBuffer.append(propertyName);
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lineBuffer.append(':');
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appendMultilineEncodedValue(lineBuffer, propertyValue);
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writeLine(lineBuffer.toString());
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}
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}
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/**
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* Append and encode \n to \\n in value.
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*
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* @param buffer line buffer
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* @param value value
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*/
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protected void appendMultilineEncodedValue(StringBuilder buffer, String value) {
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for (int i = 0; i < value.length(); i++) {
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char c = value.charAt(i);
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if (c == '\n') {
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buffer.append("\\n");
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// skip carriage return
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} else if (c != '\r') {
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buffer.append(value.charAt(i));
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}
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}
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}
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}
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