001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 * 
010 *      http://www.apache.org/licenses/LICENSE-2.0
011 * 
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.oozie.client.rest;
019
020import java.text.ParseException;
021import java.text.SimpleDateFormat;
022import java.util.ArrayList;
023import java.util.Date;
024import java.util.List;
025import java.util.Locale;
026import java.util.TimeZone;
027
028import org.json.simple.JSONArray;
029import org.json.simple.JSONObject;
030
031
032/**
033 * Json utils methods.
034 */
035public class JsonUtils {
036
037    /**
038     * Format a Date in RFC822 with the given time zone.
039     *
040     * @param date date to format.
041     * @param timeZoneId the time zone to use
042     * @return RFC822 for the date, <code>null</code> if the date was <code>null</null>.
043     */
044    public static String formatDateRfc822(Date date, String timeZoneId) {
045        if (date != null) {
046            TimeZone tZone = TimeZone.getTimeZone(timeZoneId);
047            SimpleDateFormat dateFormater = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
048            dateFormater.setTimeZone(tZone);
049            return dateFormater.format(date);
050        }
051        return null;
052    }
053    
054    /**
055     * Format a Date in RFC822 GMT.
056     *
057     * @param date date to format.
058     * @return RFC822 GMT for the date, <code>null</code> if the date was <code>null</null>.
059     */
060    public static String formatDateRfc822(Date date) {
061        return formatDateRfc822(date, "GMT");
062    }
063
064    /**
065     * Parse a string in RFC822 GMT format.
066     *
067     * @param str string to parse.
068     * @return parsed date, <code>null</code> if the string was <code>null</null> or in an invalid format.
069     */
070    static Date parseDateRfc822(String str) {
071        if (str != null) {
072            try {
073                SimpleDateFormat dateFormater = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss 'GMT'", Locale.US);
074                dateFormater.setTimeZone(TimeZone.getTimeZone("GMT"));
075                return dateFormater.parse(str);
076            }
077            catch (ParseException ex) {
078                return null;
079            }
080        }
081        return null;
082    }
083
084}