juick-spring-www/src/main/java/com/juick/www/formatter/SpringDateFormatter.java


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package com.juick.www.formatter;

import com.juick.util.DateFormatter;
import org.springframework.context.MessageSource;
import org.springframework.format.Formatter;

import javax.annotation.Resource;
import java.text.ParseException;
import java.util.Date;
import java.util.Locale;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * Created by aalexeev on 11/22/16.
 */
public class SpringDateFormatter implements Formatter<Date> {
    @Resource
    private MessageSource messageSource;
    private ConcurrentMap<Locale, com.juick.util.DateFormatter> formattersMap =
            new ConcurrentHashMap<>(4, 0.75f, 2); // MAX 4 languages and 4/2=2 threads for write


    @Override
    public Date parse(final String text, final Locale locale) throws ParseException {
        DateFormatter formatter = formattersMap.getOrDefault(
                locale, createFormatter(locale));

        return formatter.parse(text);
    }

    @Override
    public String print(final Date object, final Locale locale) {
        DateFormatter formatter = formattersMap.getOrDefault(
                locale, createFormatter(locale));
        return formatter.format(object);
    }

    private DateFormatter createFormatter(final Locale locale) {
        String pattern = messageSource.getMessage("date.format", null, locale);

        return new DateFormatter(pattern);
    }
}