DateParser xref

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    1   /*
    2    * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/util/DateParser.java,v 1.11 2004/11/06 19:15:42 mbecke Exp $
    3    * $Revision: 480424 $
    4    * $Date: 2006-11-29 06:56:49 +0100 (Wed, 29 Nov 2006) $
    5    *
    6    * ====================================================================
    7    *
    8    *  Licensed to the Apache Software Foundation (ASF) under one or more
    9    *  contributor license agreements.  See the NOTICE file distributed with
    10   *  this work for additional information regarding copyright ownership.
    11   *  The ASF licenses this file to You under the Apache License, Version 2.0
    12   *  (the "License"); you may not use this file except in compliance with
    13   *  the License.  You may obtain a copy of the License at
    14   *
    15   *      http://www.apache.org/licenses/LICENSE-2.0
    16   *
    17   *  Unless required by applicable law or agreed to in writing, software
    18   *  distributed under the License is distributed on an "AS IS" BASIS,
    19   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    20   *  See the License for the specific language governing permissions and
    21   *  limitations under the License.
    22   * ====================================================================
    23   *
    24   * This software consists of voluntary contributions made by many
    25   * individuals on behalf of the Apache Software Foundation.  For more
    26   * information on the Apache Software Foundation, please see
    27   * <http://www.apache.org/>.
    28   *
    29   */
    30
    31  package org.apache.commons.httpclient.util;
    32
    33  import java.text.ParseException;
    34  import java.text.SimpleDateFormat;
    35  import java.util.Arrays;
    36  import java.util.Collection;
    37  import java.util.Date;
    38  import java.util.Iterator;
    39  import java.util.Locale;
    40  import java.util.TimeZone;
    41
    42  /**
    43   * A utility class for parsing HTTP dates as used in cookies and other headers.
    44   * This class handles dates as defined by RFC 2616 section 3.3.1 as well as
    45   * some other common non-standard formats.
    46   *
    47   * @author Christopher Brown
    48   * @author Michael Becke
    49   *
    50   * @deprecated Use {@link org.apache.commons.httpclient.util.DateUtil}
    51   */
    52  public class DateParser {
    53
    54      /**
    55       * Date format pattern used to parse HTTP date headers in RFC 1123 format.
    56       */
    57      public static final String PATTERN_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";
    58
    59      /**
    60       * Date format pattern used to parse HTTP date headers in RFC 1036 format.
    61       */
    62      public static final String PATTERN_RFC1036 = "EEEE, dd-MMM-yy HH:mm:ss zzz";
    63
    64      /**
    65       * Date format pattern used to parse HTTP date headers in ANSI C
    66       * <code>asctime()</code> format.
    67       */
    68      public static final String PATTERN_ASCTIME = "EEE MMM d HH:mm:ss yyyy";
    69
    70      private static final Collection DEFAULT_PATTERNS = Arrays.asList(
    71      		new String[] { PATTERN_ASCTIME, PATTERN_RFC1036, PATTERN_RFC1123 } );
    72      /**
    73       * Parses a date value.  The formats used for parsing the date value are retrieved from
    74       * the default http params.
    75       *
    76       * @param dateValue the date value to parse
    77       *
    78       * @return the parsed date
    79       *
    80       * @throws DateParseException if the value could not be parsed using any of the
    81       * supported date formats
    82       */
    83      public static Date parseDate(String dateValue) throws DateParseException {
    84          return parseDate(dateValue, null);
    85      }
    86
    87      /**
    88       * Parses the date value using the given date formats.
    89       *
    90       * @param dateValue the date value to parse
    91       * @param dateFormats the date formats to use
    92       *
    93       * @return the parsed date
    94       *
    95       * @throws DateParseException if none of the dataFormats could parse the dateValue
    96       */
    97      public static Date parseDate(
    98          String dateValue,
    99          Collection dateFormats
    100     ) throws DateParseException {
    101
    102         if (dateValue == null) {
    103             throw new IllegalArgumentException("dateValue is null");
    104         }
    105         if (dateFormats == null) {
    106         	dateFormats = DEFAULT_PATTERNS;
    107         }
    108         // trim single quotes around date if present
    109         // see issue #5279
    110         if (dateValue.length() > 1
    111             && dateValue.startsWith("'")
    112             && dateValue.endsWith("'")
    113         ) {
    114             dateValue = dateValue.substring (1, dateValue.length() - 1);
    115         }
    116
    117         SimpleDateFormat dateParser = null;
    118         Iterator formatIter = dateFormats.iterator();
    119
    120         while (formatIter.hasNext()) {
    121             String format = (String) formatIter.next();
    122             if (dateParser == null) {
    123                 dateParser = new SimpleDateFormat(format, Locale.US);
    124                 dateParser.setTimeZone(TimeZone.getTimeZone("GMT"));
    125             } else {
    126                 dateParser.applyPattern(format);
    127             }
    128             try {
    129                 return dateParser.parse(dateValue);
    130             } catch (ParseException pe) {
    131                 // ignore this exception, we will try the next format
    132             }
    133         }
    134
    135         // we were unable to parse the date
    136         throw new DateParseException("Unable to parse the date " + dateValue);
    137     }
    138
    139     /** This class should not be instantiated. */
    140     private DateParser() { }
    141
    142 }