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Implement support for roster versioning

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Roster versioning is defined in RFC 6121, section 2.2.6; the protocol
was originally described in XEP-0237.

Fixes SMACK-399
This commit is contained in:
Lars Noschinski 2013-11-10 15:02:57 +01:00 • committed by Florian Schmaus
parent e7a2cad401
commit c06b0a7720
14 changed files with 1300 additions and 147 deletions
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42
source/org/jivesoftware/smack/util/StringUtils.java
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@ -520,10 +520,52 @@ public class StringUtils {
return buf.toString();
}
/**
* Encodes a string for use in an XML attribute by escaping characters with
* a special meaning. In particular, white spaces are encoded as character
* references, such that they are not replaced by ' ' on parsing.
*/
private static String xmlAttribEncodeBinary(String value) {
StringBuilder s = new StringBuilder();
char buf[] = value.toCharArray();
for (char c : buf) {
switch (c) {
case '<': s.append("&lt;"); break;
case '>': s.append("&gt;"); break;
case '&': s.append("&amp;"); break;
case '"': s.append("&quot;"); break;
case '\'': s.append("&apos;"); break;
default:
if (c <= 0x1f || (0x7f <= c && c <= 0x9f)) { // includes \t, \n, \r
s.append("&#x");
s.append(String.format("%X", (int)c));
s.append(';');
} else {
s.append(c);
}
}
}
return s.toString();
}
/**
* Returns a string representing a XML attribute. The value parameter is escaped as necessary. In particular,
* white spaces are encoded as character references, such that they are not replaced by ' ' on parsing.
* @param name name of the XML attribute
* @param value value of the XML attribute
*/
public static String xmlAttrib(String name, String value) {
return name + "=\"" + xmlAttribEncodeBinary(value) + "\"";
}
/**
* Escapes all necessary characters in the String so that it can be used
* in an XML doc.
*
* <strong>Warning:</strong> This method does not escape unicode character references
* (i.e. references of the from &#235;)
*
* @param string the string to escape.
* @return the string with appropriate characters escaped.
*/