public static String printable(char ch) {
if (ch == '\n') {
return "\\n";
}
if (ch == '\r') {
return "\\r";
}
if (ch == '\t') {
return "\\t";
}
if (ch == ' ') {
return "_";
}
if (ch > 127 || ch < 32) {
StringBuffer sb = new StringBuffer(6);
sb.append("\\u");
String hex = Integer.toHexString((int) ch);
for (int i = 0, len = 4 - hex.length(); i < len; i++) {
sb.append('0');
}
sb.append(hex);
return sb.toString();
}
return null;
}
public static String printableWithSpaces(String str) {
if (str == null || str.length() == 0) {
return str;
}
int len = str.length();
StringBuffer sb = new StringBuffer(len + 64);
for (int i = 0; i < len; ++i) {
char c = str.charAt(i);
String res = printableWithSpaces(c);
if (res == null) {
sb.append(c);
} else {
sb.append(res);
}
}
return sb.toString();
}