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 */
018
019package org.apache.oozie.client.rest;
020
021import java.text.ParseException;
022import java.text.SimpleDateFormat;
023import java.util.ArrayList;
024import java.util.Date;
025import java.util.List;
026import java.util.Locale;
027import java.util.TimeZone;
028
029import org.json.simple.JSONArray;
030import org.json.simple.JSONObject;
031
032
033/**
034 * Json utils methods.
035 */
036public class JsonUtils {
037
038    /**
039     * Format a Date in RFC822 with the given time zone.
040     *
041     * @param date date to format.
042     * @param timeZoneId the time zone to use
043     * @return RFC822 for the date, <code>null</code> if the date was <code>null</null>.
044     */
045    public static String formatDateRfc822(Date date, String timeZoneId) {
046        if (date != null) {
047            TimeZone tZone = TimeZone.getTimeZone(timeZoneId);
048            SimpleDateFormat dateFormater = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
049            dateFormater.setTimeZone(tZone);
050            return dateFormater.format(date);
051        }
052        return null;
053    }
054    
055    /**
056     * Format a Date in RFC822 GMT.
057     *
058     * @param date date to format.
059     * @return RFC822 GMT for the date, <code>null</code> if the date was <code>null</null>.
060     */
061    public static String formatDateRfc822(Date date) {
062        return formatDateRfc822(date, "GMT");
063    }
064
065    /**
066     * Parse a string in RFC822 GMT format.
067     *
068     * @param str string to parse.
069     * @return parsed date, <code>null</code> if the string was <code>null</null> or in an invalid format.
070     */
071    static Date parseDateRfc822(String str) {
072        if (str != null) {
073            try {
074                SimpleDateFormat dateFormater = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss 'GMT'", Locale.US);
075                dateFormater.setTimeZone(TimeZone.getTimeZone("GMT"));
076                return dateFormater.parse(str);
077            }
078            catch (ParseException ex) {
079                return null;
080            }
081        }
082        return null;
083    }
084
085}