| Code with Finding: |
class Messages {
/**
* Generates a formatted text string given a source string containing
* "argument markers" of the form "{argNum}" where each argNum must be in
* the range 0..9. The result is generated by inserting the toString of each
* argument into the position indicated in the string.
* <p>
* To insert the "{" character into the output, use a single backslash
* character to escape it (i.e. "\{"). The "}" character does not need to be
* escaped.
*
* @param format
* String the format to use when printing.
* @param args
* Object[] the arguments to use.
* @return String the formatted message.
*/
public static String format(String format, Object[] args) {
StringBuilder answer = new StringBuilder(format.length()
+ (args.length * 20));
String[] argStrings = new String[args.length];
for (int i = 0; i < args.length; ++i) {
if (args[i] == null)
argStrings[i] = "<null>"; //$NON-NLS-1$
else
argStrings[i] = args[i].toString();
}
int lastI = 0;
for (int i = format.indexOf('{', 0); i >= 0; i = format.indexOf('{',
lastI)) {
if (i != 0 && format.charAt(i - 1) == '\\') {
// It's escaped, just print and loop.
if (i != 1)
answer.append(format.substring(lastI, i - 1));
answer.append('{');
lastI = i + 1;
} else {
// It's a format character.
if (i > format.length() - 3) {
// Bad format, just print and loop.
answer.append(format.substring(lastI, format.length()));
lastI = format.length();
} else {
int argnum = (byte) Character.digit(format.charAt(i + 1),
10);
if (argnum < 0 || format.charAt(i + 2) != '}') {
// Bad format, just print and loop.
answer.append(format.substring(lastI, i + 1));
lastI = i + 1;
} else {
// Got a good one!
answer.append(format.substring(lastI, i));
if (argnum >= argStrings.length)
answer.append("<missing argument>"); //$NON-NLS-1$
else
answer.append(argStrings[argnum]);
lastI = i + 3;
}
}
}
}
if (lastI < format.length())
answer.append(format.substring(lastI, format.length()));
return answer.toString();
}
}
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