/**
* Compares two strings lexicographically.
*
* @param xstr the <code>String</code> to be compared.
* @return the value <code>0</code> if the argument string is equal to this string; a value less
* than <code>0</code> if this string is lexicographically less than the string argument; and
* a value greater than <code>0</code> if this string is lexicographically greater than the
* string argument.
* @exception java.lang.NullPointerException if <code>anotherString</code> is <code>null</code>.
*/
public int compareTo(XMLString xstr) {
int len1 = this.length();
int len2 = xstr.length();
int n = Math.min(len1, len2);
int i = 0;
int j = 0;
while (n-- != 0) {
char c1 = this.charAt(i);
char c2 = xstr.charAt(j);
if (c1 != c2) {
return c1 - c2;
}
i++;
j++;
}
return len1 - len2;
}
/**
* Tests if this string starts with the specified prefix beginning a specified index.
*
* @param prefix the prefix.
* @param toffset where to begin looking in the string.
* @return <code>true</code> if the character sequence represented by the argument is a prefix of
* the substring of this object starting at index <code>toffset</code>; <code>false</code>
* otherwise. The result is <code>false</code> if <code>toffset</code> is negative or greater
* than the length of this <code>String</code> object; otherwise the result is the same as the
* result of the expression
* <pre>
* this.subString(toffset).startsWith(prefix)
* </pre>
*
* @exception java.lang.NullPointerException if <code>prefix</code> is <code>null</code>.
*/
public boolean startsWith(XMLString prefix, int toffset) {
int to = toffset;
int tlim = this.length();
int po = 0;
int pc = prefix.length();
// Note: toffset might be near -1>>>1.
if ((toffset < 0) || (toffset > tlim - pc)) {
return false;
}
while (--pc >= 0) {
if (this.charAt(to) != prefix.charAt(po)) {
return false;
}
to++;
po++;
}
return true;
}
/**
* Convert a string to a double -- Allowed input is in fixed notation ddd.fff.
*
* @return A double value representation of the string, or return Double.NaN if the string can not
* be converted.
*/
public double toDouble() {
/* XMLCharacterRecognizer.isWhiteSpace(char c) methods treats the following
* characters as white space characters.
* ht - horizontal tab, nl - newline , cr - carriage return and sp - space
* trim() methods by default also takes care of these white space characters
* So trim() method is used to remove leading and trailing white spaces.
*/
XMLString s = trim();
double result = Double.NaN;
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c != '-' && c != '.' && (c < 0X30 || c > 0x39)) {
// The character is not a '-' or a '.' or a digit
// then return NaN because something is wrong.
return result;
}
}
try {
result = Double.parseDouble(s.toString());
} catch (NumberFormatException e) {
}
return result;
}