/**
* Initialize derived fields from defining fields. This is called from constructor and from
* readObject (de-serialization)
*
* @param definingCalendar the {@link Calendar} instance used to initialize this FastDateParser
*/
private void init(Calendar definingCalendar) {
final StringBuilder regex = new StringBuilder();
final List<Strategy> collector = new ArrayList<Strategy>();
final Matcher patternMatcher = formatPattern.matcher(pattern);
if (!patternMatcher.lookingAt()) {
throw new IllegalArgumentException(
"Illegal pattern character '" + pattern.charAt(patternMatcher.regionStart()) + "'");
}
currentFormatField = patternMatcher.group();
Strategy currentStrategy = getStrategy(currentFormatField, definingCalendar);
for (; ; ) {
patternMatcher.region(patternMatcher.end(), patternMatcher.regionEnd());
if (!patternMatcher.lookingAt()) {
nextStrategy = null;
break;
}
final String nextFormatField = patternMatcher.group();
nextStrategy = getStrategy(nextFormatField, definingCalendar);
if (currentStrategy.addRegex(this, regex)) {
collector.add(currentStrategy);
}
currentFormatField = nextFormatField;
currentStrategy = nextStrategy;
}
if (patternMatcher.regionStart() != patternMatcher.regionEnd()) {
throw new IllegalArgumentException(
"Failed to parse \"" + pattern + "\" ; gave up at index " + patternMatcher.regionStart());
}
if (currentStrategy.addRegex(this, regex)) {
collector.add(currentStrategy);
}
currentFormatField = null;
strategies = collector.toArray(new Strategy[collector.size()]);
parsePattern = Pattern.compile(regex.toString());
}