Android Date String Parse parseDate(String str, String... parsePatterns)

Description

Parses a string representing a date by trying a variety of different parsers.

The parse will try each parse pattern in turn.

License

Apache License

Parameter

Parameter	Description
str	the date to parse, not null
parsePatterns	the date format patterns to use, see SimpleDateFormat, not null

Exception

Parameter	Description
IllegalArgumentException	if the date string or pattern array is null
ParseException	if none of the date patterns were suitable (or there were none)

Return

the parsed date

Declaration

public static Date parseDate(String str, String... parsePatterns)
        throws ParseException 

Method Source Code

//package com.java2s;
/*/*from w ww. j av a 2  s  .c  o m*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;

import java.util.Date;

public class Main {
    /**
     * <p>Parses a string representing a date by trying a variety of different parsers.</p>
     * 
     * <p>The parse will try each parse pattern in turn.
     * A parse is only deemed successful if it parses the whole of the input string.
     * If no parse patterns match, a ParseException is thrown.</p>
     * The parser will be lenient toward the parsed date.
     * 
     * @param str  the date to parse, not null
     * @param parsePatterns  the date format patterns to use, see SimpleDateFormat, not null
     * @return the parsed date
     * @throws IllegalArgumentException if the date string or pattern array is null
     * @throws ParseException if none of the date patterns were suitable (or there were none)
     */
    public static Date parseDate(String str, String... parsePatterns)
            throws ParseException {
        return parseDateWithLeniency(str, parsePatterns, true);
    }

    /**
     * <p>Parses a string representing a date by trying a variety of different parsers.</p>
     * 
     * <p>The parse will try each parse pattern in turn.
     * A parse is only deemed successful if it parses the whole of the input string.
     * If no parse patterns match, a ParseException is thrown.</p>
     * 
     * @param str  the date to parse, not null
     * @param parsePatterns  the date format patterns to use, see SimpleDateFormat, not null
     * @param lenient Specify whether or not date/time parsing is to be lenient.
     * @return the parsed date
     * @throws IllegalArgumentException if the date string or pattern array is null
     * @throws ParseException if none of the date patterns were suitable
     * @see java.util.Calender#isLenient()
     */
    private static Date parseDateWithLeniency(String str,
            String[] parsePatterns, boolean lenient) throws ParseException {
        if (str == null || parsePatterns == null) {
            throw new IllegalArgumentException(
                    "Date and Patterns must not be null");
        }

        SimpleDateFormat parser = new SimpleDateFormat();
        parser.setLenient(lenient);
        ParsePosition pos = new ParsePosition(0);
        for (String parsePattern : parsePatterns) {

            String pattern = parsePattern;

            // LANG-530 - need to make sure 'ZZ' output doesn't get passed to SimpleDateFormat
            if (parsePattern.endsWith("ZZ")) {
                pattern = pattern.substring(0, pattern.length() - 1);
            }

            parser.applyPattern(pattern);
            pos.setIndex(0);

            String str2 = str;
            // LANG-530 - need to make sure 'ZZ' output doesn't hit SimpleDateFormat as it will ParseException
            if (parsePattern.endsWith("ZZ")) {
                str2 = str.replaceAll("([-+][0-9][0-9]):([0-9][0-9])$",
                        "$1$2");
            }

            Date date = parser.parse(str2, pos);
            if (date != null && pos.getIndex() == str2.length()) {
                return date;
            }
        }
        throw new ParseException("Unable to parse the date: " + str, -1);
    }
}

Related

1. parseDate(String dateValue)
2. parseDate(String dateValue, String[] dateFormats, Date startDate)
3. parseDate(String dateValue, String[] dateFormats, Date startDate)
4. parseDate(String str)
5. parseDate(String str, String parsePattern)
6. parseDate(String ts)
7. parseDate(final String dateValue, String[] dateFormats)
8. parseDate(final String dateValue, String[] dateFormats)
9. parseDateStrictly(String str, String... parsePatterns)