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/*
* Copyright (C) 2001-2013 Michael Fuchs
*
* This file is part of herold.
*
* herold is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* herold is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with herold. If not, see <http://www.gnu.org/licenses/>.
*/
package org.dbdoclet.service;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Die Klasse <code>UnicodeServices</code> stellt eine Sammlung statischer
* Methoden zur Bearbeitung von Unicode zur Verfügung.
*
* @author <a href="mailto:michael.fuchs@unico-group.com">Michael Fuchs</a>
* @version 1.0
*/
public class UnicodeServices {
private static Pattern pattern = Pattern.compile("\\\\u[0-9a-fA-F]{4}");
public static String escape(char c) {
char[] v = new char[1];
v[0] = c;
return escape(new String(v));
}
/**
* Die Methode <code>escape</code> wandelt die Zeichenkette
* <code>str</code> in eine 7-bit ASCII Darstellung um.
*
* @param str <code>String</code>
* @return <code>String</code>
*/
public static String escape(String str) {
if (str == null) {
return "";
}
StringBuffer buffer = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);
int n = c;
if (c == '\r') {
continue;
}
if (n >= 0 && n < 128 && c != '\n' && c != '\\') {
buffer.append(c);
} else {
buffer.append("\\u");
String hex = Integer.toHexString(n);
for (int j = 0; j < 4 - hex.length(); j++) {
buffer.append("0");
}
buffer.append(hex);
}
}
return buffer.toString();
}
public static String unescape(String str) {
Matcher matcher = pattern.matcher(str);
char[] c = new char[1];
String escape;
String buffer;
String part1;
String part2;
while (matcher.find()) {
escape = matcher.group();
c[0] = (char) Integer.parseInt(escape.substring(2), 16);
buffer = new String(c);
// System.out.println("buffer = " + buffer);
part1 = str.substring(0, matcher.start());
// System.out.println("part1 = " + part1);
part2 = str.substring(matcher.end());
// System.out.println("part2 = " + part2);
str = part1 + buffer + part2;
// System.out.println("str = " + str);
matcher.reset(str);
}
return str;
}
public static String removeUndefinedCharacters(String text) {
if (text == null || text.length() == 0) {
return "";
}
StringBuffer textBuffer = new StringBuffer(text);
StringBuffer buffer = new StringBuffer();
char c;
for (int i = 0; i < textBuffer.length(); i++) {
c = textBuffer.charAt(i);
if (c == '\n' || c == '\t') {
buffer.append(c);
continue;
}
if (Character.isISOControl(c) == false
&& Character.isDefined(c) == true) {
buffer.append(c);
}
}
return buffer.toString();
}
}
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