/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.commons.i18n;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import java.util.WeakHashMap;

/**
 * 
 */
public final class DateFormatPool {
    
    private final static Map data=new WeakHashMap();
    
    /**
     * pool for formated dates
     * @param locale
     * @param timeZone
     * @param pattern
     * @param date
     * @return date matching given values
     */
    public static synchronized String format(Locale locale, TimeZone timeZone, String pattern,Date date) {
        String key=locale.toString()+'-'+timeZone.getID()+'-'+pattern;
        Object obj=data.get(key);
        if(obj!=null) {
            return ((SimpleDateFormat)obj).format(date);
        }
        SimpleDateFormat sdf = new SimpleDateFormat(pattern,locale);
        sdf.setTimeZone(timeZone);
        data.put(key,sdf);
        return sdf.format(date);
    }

    /**
     * pool for formated dates
     * @param locale
     * @param pattern
     * @param date
     * @return date matching given values
     */
    public static synchronized String format(Locale locale, String pattern,Date date) {
        String key=locale.toString()+'-'+pattern;
        
        Object obj=data.get(key);
        if(obj!=null) {
            return ((SimpleDateFormat)obj).format(date);
        }//print.ln(key);
        SimpleDateFormat sdf = new SimpleDateFormat(pattern,locale);
        data.put(key,sdf);
        return sdf.format(date);
    }

    /**
     * pool for formated dates
     * @param pattern
     * @param date
     * @return date matching given values
     */
    public static synchronized String format(String pattern,Date date) {
        Object obj=data.get(pattern);
        if(obj!=null) {
            return ((SimpleDateFormat)obj).format(date);
        }//print.ln(pattern);
        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
        data.put(pattern,sdf);
        return sdf.format(date);
    }
    
}