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1 /* 2 * $Header: /home/cvs/jakarta-commons/validator/src/share/org/apache/commons/validator/DateValidator.java,v 1.6 2004/02/21 17:10:29 rleland Exp $ 3 * $Revision: 1.6 $ 4 * $Date: 2004/02/21 17:10:29 $ 5 * 6 * ==================================================================== 7 * Copyright 2001-2004 The Apache Software Foundation 8 * 9 * Licensed under the Apache License, Version 2.0 (the "License"); 10 * you may not use this file except in compliance with the License. 11 * You may obtain a copy of the License at 12 * 13 * http://www.apache.org/licenses/LICENSE-2.0 14 * 15 * Unless required by applicable law or agreed to in writing, software 16 * distributed under the License is distributed on an "AS IS" BASIS, 17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 18 * See the License for the specific language governing permissions and 19 * limitations under the License. 20 */ 21 22 package org.apache.commons.validator; 23 24 import java.text.DateFormat; 25 import java.text.ParseException; 26 import java.text.SimpleDateFormat; 27 import java.util.Locale; 28 29 /*** 30 * <p>Perform date validations.</p> 31 * <p> 32 * This class is a Singleton; you can retrieve the instance via the 33 * getInstance() method. 34 * </p> 35 * 36 * @since Validator 1.1 37 */ 38 public class DateValidator { 39 40 /*** 41 * Singleton instance of this class. 42 */ 43 private static final DateValidator instance = new DateValidator(); 44 45 /*** 46 * Returns the Singleton instance of this validator. 47 */ 48 public static DateValidator getInstance() { 49 return instance; 50 } 51 52 /*** 53 * Protected constructor for subclasses to use. 54 */ 55 protected DateValidator() { 56 super(); 57 } 58 59 /*** 60 * <p>Checks if the field is a valid date. The pattern is used with 61 * <code>java.text.SimpleDateFormat</code>. If strict is true, then the 62 * length will be checked so '2/12/1999' will not pass validation with 63 * the format 'MM/dd/yyyy' because the month isn't two digits. 64 * The setLenient method is set to <code>false</code> for all.</p> 65 * 66 * @param value The value validation is being performed on. 67 * @param datePattern The pattern passed to <code>SimpleDateFormat</code>. 68 * @param strict Whether or not to have an exact match of the datePattern. 69 */ 70 public boolean isValid(String value, String datePattern, boolean strict) { 71 72 if (value == null 73 || datePattern == null 74 || datePattern.length() <= 0) { 75 76 return false; 77 } 78 79 SimpleDateFormat formatter = new SimpleDateFormat(datePattern); 80 formatter.setLenient(false); 81 82 try { 83 formatter.parse(value); 84 } catch(ParseException e) { 85 return false; 86 } 87 88 if (strict && (datePattern.length() != value.length())) { 89 return false; 90 } 91 92 return true; 93 } 94 95 /*** 96 * <p>Checks if the field is a valid date. The <code>Locale</code> is 97 * used with <code>java.text.DateFormat</code>. The setLenient method 98 * is set to <code>false</code> for all.</p> 99 * 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 */ 104 public boolean isValid(String value, Locale locale) { 105 106 if (value == null) { 107 return false; 108 } 109 110 DateFormat formatter = null; 111 if (locale != null) { 112 formatter = DateFormat.getDateInstance(DateFormat.SHORT, locale); 113 } else { 114 formatter = 115 DateFormat.getDateInstance( 116 DateFormat.SHORT, 117 Locale.getDefault()); 118 } 119 120 formatter.setLenient(false); 121 122 try { 123 formatter.parse(value); 124 } catch(ParseException e) { 125 return false; 126 } 127 128 return true; 129 } 130 131 }

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