/*
 * #%L
 * Wisdom-Framework
 * %%
 * Copyright (C) 2013 - 2014 Wisdom Framework
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */
package org.wisdom.api.utils;

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

import java.util.Date;
import java.util.Locale;

public class DateUtil {
	
	private DateUtil(){
	    // Hide implicit constructor
	}
    
    /**
     *  From here: http://www.ietf.org/rfc/rfc1123.txt.
     */
    private static final DateTimeFormatter RFC1123_DATE_FORMAT = DateTimeFormat
            .forPattern("EEE, dd MMM yyyy HH:mm:ss 'GMT'")
            .withLocale(Locale.US)
            .withZone(DateTimeZone.UTC);
    
    /**
     * Can be used to format a date into http header compatible 
     * strings.
     * 
     * It can be used to generate something like:
     * Date: Wed, 05 Sep 2012 09:16:19 GMT
     * Expires: Thu, 01 Jan 1970 00:00:00 GMT
     * 
     * @param date The date to format
     * @return a http header compatible string like "Thu, 01 Jan 1970 00:00:00 GMT"
     */
    public static String formatForHttpHeader(Date date) {
        return RFC1123_DATE_FORMAT.print(new DateTime(date));
    }
    
    /**
     * Can be used to format a unix timestamp into 
     * http header compatible strings.
     * 
     * It can be used to generate something like:
     * Date: Wed, 05 Sep 2012 09:16:19 GMT
     * Expires: Thu, 01 Jan 1970 00:00:00 GMT
     * 
     * @param date The long (unixtime) to format
     * @return a http header compatible string like "Thu, 01 Jan 1970 00:00:00 GMT"
     */
    public static String formatForHttpHeader(Long date) {
        
        return RFC1123_DATE_FORMAT.print(new DateTime(date));
    }
    
    
    /**
     * Can be used to parse http times. For instance something like a http header
     * Date: Tue, 26 Mar 2013 13:47:13 GMT
     * 
     * INFO: consider the JodaTime based DateUtil.parseHttpDateFormatToDateTime(...) version
     * 
     * @param httpDateFormat in http format: Date: Tue, 26 Mar 2013 13:47:13 GMT
     * @return A nice "Date" object containing that http timestamp.
     * @throws java.text.ParseException If something goes wrong.
     */
    public static Date parseHttpDateFormat(String httpDateFormat) throws IllegalArgumentException {
        return parseHttpDateFormatToDateTime(httpDateFormat).toDate();
    }

    /**
     * Can be used to parse http times. For instance something like a http header
     * Date: Tue, 26 Mar 2013 13:47:13 GMT
     *
     * @param httpDateFormat in http format: Date: Tue, 26 Mar 2013 13:47:13 GMT
     * @return A nice "DateTime" (JodaTime) object containing that http timestamp.
     * @throws java.text.ParseException If something goes wrong.
     */
    public static DateTime parseHttpDateFormatToDateTime(String httpDateFormat) throws IllegalArgumentException {
               
        return RFC1123_DATE_FORMAT.parseDateTime(httpDateFormat);

    }

}

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@@ -2712,34 +2712,44 @@
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