001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.validator;
018
019 import java.text.DateFormat;
020 import java.text.ParseException;
021 import java.text.SimpleDateFormat;
022 import java.util.Locale;
023
024 /**
025 * <p>Perform date validations.</p>
026 * <p>
027 * This class is a Singleton; you can retrieve the instance via the
028 * getInstance() method.
029 * </p>
030 *
031 * @version $Revision: 594962 $ $Date: 2007-11-14 18:30:27 +0100 (Mi, 14. Nov 2007) $
032 * @since Validator 1.1
033 * @deprecated Use the new DateValidator, CalendarValidator or TimeValidator in the
034 * routines package. This class will be removed in a future release.
035 */
036 public class DateValidator {
037
038 /**
039 * Singleton instance of this class.
040 */
041 private static final DateValidator DATE_VALIDATOR = new DateValidator();
042
043 /**
044 * Returns the Singleton instance of this validator.
045 * @return A singleton instance of the DateValidator.
046 */
047 public static DateValidator getInstance() {
048 return DATE_VALIDATOR;
049 }
050
051 /**
052 * Protected constructor for subclasses to use.
053 */
054 protected DateValidator() {
055 super();
056 }
057
058 /**
059 * <p>Checks if the field is a valid date. The pattern is used with
060 * <code>java.text.SimpleDateFormat</code>. If strict is true, then the
061 * length will be checked so '2/12/1999' will not pass validation with
062 * the format 'MM/dd/yyyy' because the month isn't two digits.
063 * The setLenient method is set to <code>false</code> for all.</p>
064 *
065 * @param value The value validation is being performed on.
066 * @param datePattern The pattern passed to <code>SimpleDateFormat</code>.
067 * @param strict Whether or not to have an exact match of the datePattern.
068 * @return true if the date is valid.
069 */
070 public boolean isValid(String value, String datePattern, boolean strict) {
071
072 if (value == null
073 || datePattern == null
074 || datePattern.length() <= 0) {
075
076 return false;
077 }
078
079 SimpleDateFormat formatter = new SimpleDateFormat(datePattern);
080 formatter.setLenient(false);
081
082 try {
083 formatter.parse(value);
084 } catch(ParseException e) {
085 return false;
086 }
087
088 if (strict && (datePattern.length() != value.length())) {
089 return false;
090 }
091
092 return true;
093 }
094
095 /**
096 * <p>Checks if the field is a valid date. The <code>Locale</code> is
097 * used with <code>java.text.DateFormat</code>. The setLenient method
098 * is set to <code>false</code> for all.</p>
099 *
100 * @param value The value validation is being performed on.
101 * @param locale The locale to use for the date format, defaults to the default
102 * system default if null.
103 * @return true if the date is valid.
104 */
105 public boolean isValid(String value, Locale locale) {
106
107 if (value == null) {
108 return false;
109 }
110
111 DateFormat formatter = null;
112 if (locale != null) {
113 formatter = DateFormat.getDateInstance(DateFormat.SHORT, locale);
114 } else {
115 formatter =
116 DateFormat.getDateInstance(
117 DateFormat.SHORT,
118 Locale.getDefault());
119 }
120
121 formatter.setLenient(false);
122
123 try {
124 formatter.parse(value);
125 } catch(ParseException e) {
126 return false;
127 }
128
129 return true;
130 }
131
132 }