Android Open Source - android-rss Date Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * $Id: DateUtils.java 109 2007-12-19 07:04:18Z jasta00 $
 */*from  w  ww .j  av  a 2s .  c o m*/
 * Copyright (C) 2006 Josh Guilfoyle <jasta@devtcg.org>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * Code lifted from Informa <http://informa.sourceforge.net>.
 */

package org.devtcg.rssreader.util;

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

import android.util.Log;

/**
 * Utility class for formatting and parsing the various date formats we expect
 * to encounter.
 */
public class DateUtils
{
  private static final String TAG = "DateUtils";
  
  private static final SimpleDateFormat[] dateFormats;
  private static final int dateFormat_default = 2;

  private DateUtils() { }

  static
  {
      final String[] possibleDateFormats =
      {
        "EEE, dd MMM yyyy HH:mm:ss z", // RFC_822
        "EEE, dd MMM yyyy HH:mm zzzz",
        "yyyy-MM-dd'T'HH:mm:ssZ",
        "yyyy-MM-dd'T'HH:mm:ss.SSSzzzz", // Blogger Atom feed has millisecs also
        "yyyy-MM-dd'T'HH:mm:sszzzz",
        "yyyy-MM-dd'T'HH:mm:ss z",
        "yyyy-MM-dd'T'HH:mm:ssz", // ISO_8601
        "yyyy-MM-dd'T'HH:mm:ss",
        "yyyy-MM-dd'T'HHmmss.SSSz",
        "yyyy-MM-dd"
      };

      dateFormats = new SimpleDateFormat[possibleDateFormats.length];
      TimeZone gmtTZ = TimeZone.getTimeZone("GMT");

      for (int i = 0; i < possibleDateFormats.length; i++)
      {
        /* TODO: Support other locales? */
        dateFormats[i] = new SimpleDateFormat(possibleDateFormats[i],
          Locale.ENGLISH);

        dateFormats[i].setTimeZone(gmtTZ);
      }
  }

  /**
   * Parse a date string.  The format of RSS/Atom dates come in many
   * different forms, so this method is extremely flexible and attempts to
   * understand many different formats.
   *
   * Copied verbatim from Informa 0.7.0-alpha2, ParserUtils.java.
   *
   * @param strdate
   *   Date string to attempt to parse.
   *
   * @return
   *   If successful, returns a {@link Date} object representing the parsed
   *   date; otherwise, null.
   */
  public static Date parseDate(String strdate)
  {
    Date result = null;
    strdate = strdate.trim();
    if (strdate.length() > 10) {

      // TODO deal with +4:00 (no zero before hour)
      if ((strdate.substring(strdate.length() - 5).indexOf("+") == 0 || strdate
          .substring(strdate.length() - 5).indexOf("-") == 0)
          && strdate.substring(strdate.length() - 5).indexOf(":") == 2) {

        String sign = strdate.substring(strdate.length() - 5,
            strdate.length() - 4);

        strdate = strdate.substring(0, strdate.length() - 5) + sign + "0"
        + strdate.substring(strdate.length() - 4);
        // logger.debug("CASE1 : new date " + strdate + " ? "
        //    + strdate.substring(0, strdate.length() - 5));

      }

      String dateEnd = strdate.substring(strdate.length() - 6);

      // try to deal with -05:00 or +02:00 at end of date
      // replace with -0500 or +0200
      if ((dateEnd.indexOf("-") == 0 || dateEnd.indexOf("+") == 0)
          && dateEnd.indexOf(":") == 3) {
        // TODO deal with GMT-00:03
        if ("GMT".equals(strdate.substring(strdate.length() - 9, strdate
            .length() - 6))) {
          Log.d(TAG, "General time zone with offset, no change");
        } else {
          // continue treatment
          String oldDate = strdate;
          String newEnd = dateEnd.substring(0, 3) + dateEnd.substring(4);
          strdate = oldDate.substring(0, oldDate.length() - 6) + newEnd;
          // logger.debug("!!modifying string ->"+strdate);
        }
      }
    }
    int i = 0;
    while (i < dateFormats.length) {
      try {
        result = dateFormats[i].parse(strdate);
        // logger.debug("******Parsing Success "+strdate+"->"+result+" with
        // "+dateFormats[i].toPattern());
        break;
      } catch (java.text.ParseException eA) {
        i++;
      }
    }

    return result;
  }

  /**
   * Format a date in a manner that would be most suitable for serialized
   * storage.
   *
   * @param date
   *   {@link Date} object to format.
   *
   * @return
   *   Robust, formatted date string.
   */
  public static String formatDate(Date date)
  {
    return dateFormats[dateFormat_default].format(date);
  }
}

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