juick-core/src/main/java/com/juick/util/PrettyTimeFormatter.java


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package com.juick.util;

import org.ocpsoft.prettytime.PrettyTime;

import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Locale;
import java.util.Map;

/**
 * Created by vitalyster on 04.05.2017.
 */
public class PrettyTimeFormatter {
    private static final int MAX_CACHE_SIZE = 20;

    // Cache PrettyTime per locale. LRU cache to prevent memory leak.
    private static final Map<Locale, PrettyTime> PRETTY_TIME_LOCALE_MAP =
            new LinkedHashMap<Locale, PrettyTime>(MAX_CACHE_SIZE + 1, 1.1F, true)
    {
        @Override
        protected boolean removeEldestEntry(Map.Entry<Locale, PrettyTime> eldest)
        {
            return size() > MAX_CACHE_SIZE;
        }
    };

    public String format(final Locale locale, final Date value)
    {
        PrettyTime prettyTime;

        synchronized (PRETTY_TIME_LOCALE_MAP) {
            prettyTime = PRETTY_TIME_LOCALE_MAP.computeIfAbsent(locale, PrettyTime::new);
        }
        return prettyTime.format(value);
    }
}