|
/*
* Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2006.
*
* Licensed under the Aduna BSD-style license.
*/
public class Utils {
/**
* Tries to find a point in the supplied URI where this URI can be safely
* split into a namespace part and a local name. According to the XML
* specifications, a local name must start with a letter or underscore and
* can be followed by zero or more 'NCName' characters.
*
* @param uri The URI to split.
* @return The index of the first character of the local name, or
* <tt>-1</tt> if the URI can not be split into a namespace and local name.
*/
public static int findURISplitIndex(String uri) {
int uriLength = uri.length();
// Search last character that is not an NCName character
int i = uriLength - 1;
while (i >= 0) {
char c = uri.charAt(i);
// Check for # and / characters explicitly as these
// are used as the end of a namespace very frequently
if (c == '#' || c == '/' || !XMLUtil.isNCNameChar(c)) {
// Found it at index i
break;
}
i--;
}
// Character after the just found non-NCName character could
// be an NCName character, but not a letter or underscore.
// Skip characters that are not letters or underscores.
i++;
while (i < uriLength) {
char c = uri.charAt(i);
if (c == '_' || XMLUtil.isLetter(c)) {
break;
}
i++;
}
// Check that a legal split point has been found
if (i == uriLength) {
i = -1;
}
return i;
}
}
|