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1 /* 2 * $Header: /home/cvs/jakarta-commons/validator/src/share/org/apache/commons/validator/GenericTypeValidator.java,v 1.13 2004/02/21 17:10:29 rleland Exp $ 3 * $Revision: 1.13 $ 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.io.Serializable; 25 import java.util.Date; 26 import java.util.Locale; 27 import java.text.DateFormat; 28 import java.text.SimpleDateFormat; 29 import java.text.ParseException; 30 import org.apache.commons.logging.Log; 31 import org.apache.commons.logging.LogFactory; 32 33 /*** 34 * This class contains basic methods for performing validations that return the 35 * correctly typed class based on the validation performed. 36 */ 37 public class GenericTypeValidator implements Serializable { 38 /* 39 * Logger. 40 */ 41 private static Log log = LogFactory.getLog(GenericTypeValidator.class); 42 43 /*** 44 * Checks if the value can safely be converted to a byte primitive. 45 * 46 * @param value The value validation is being performed on. 47 */ 48 public static Byte formatByte(String value) { 49 if (value == null) { 50 return null; 51 } 52 53 try { 54 return new Byte(value); 55 } catch(NumberFormatException e) { 56 return null; 57 } 58 59 } 60 61 /*** 62 * Checks if the value can safely be converted to a short primitive. 63 * 64 * @param value The value validation is being performed on. 65 */ 66 public static Short formatShort(String value) { 67 if (value == null) { 68 return null; 69 } 70 71 try { 72 return new Short(value); 73 } catch(NumberFormatException e) { 74 return null; 75 } 76 77 } 78 79 /*** 80 * Checks if the value can safely be converted to a int primitive. 81 * 82 * @param value The value validation is being performed on. 83 */ 84 public static Integer formatInt(String value) { 85 if (value == null) { 86 return null; 87 } 88 89 try { 90 return new Integer(value); 91 } catch(NumberFormatException e) { 92 return null; 93 } 94 95 } 96 97 /*** 98 * Checks if the value can safely be converted to a long primitive. 99 * 100 * @param value The value validation is being performed on. 101 */ 102 public static Long formatLong(String value) { 103 if (value == null) { 104 return null; 105 } 106 107 try { 108 return new Long(value); 109 } catch(NumberFormatException e) { 110 return null; 111 } 112 113 } 114 115 /*** 116 * Checks if the value can safely be converted to a float primitive. 117 * 118 * @param value The value validation is being performed on. 119 */ 120 public static Float formatFloat(String value) { 121 if (value == null) { 122 return null; 123 } 124 125 try { 126 return new Float(value); 127 } catch(NumberFormatException e) { 128 return null; 129 } 130 131 } 132 133 /*** 134 * Checks if the value can safely be converted to a double primitive. 135 * 136 * @param value The value validation is being performed on. 137 */ 138 public static Double formatDouble(String value) { 139 if (value == null) { 140 return null; 141 } 142 143 try { 144 return new Double(value); 145 } catch(NumberFormatException e) { 146 return null; 147 } 148 149 } 150 151 /*** 152 * <p>Checks if the field is a valid date. The <code>Locale</code> is 153 * used with <code>java.text.DateFormat</code>. The setLenient method 154 * is set to <code>false</code> for all.</p> 155 * 156 * @param value The value validation is being performed on. 157 * @param locale The Locale to use to parse the date (system default if null) 158 */ 159 public static Date formatDate(String value, Locale locale) { 160 Date date = null; 161 162 if (value == null) { 163 return null; 164 } 165 166 try { 167 DateFormat formatter = null; 168 if (locale != null) { 169 formatter = 170 DateFormat.getDateInstance(DateFormat.SHORT, locale); 171 } else { 172 formatter = 173 DateFormat.getDateInstance( 174 DateFormat.SHORT, 175 Locale.getDefault()); 176 } 177 178 formatter.setLenient(false); 179 180 date = formatter.parse(value); 181 } catch(ParseException e) { 182 // Bad date so return null 183 log.warn(value, e); 184 } 185 186 return date; 187 } 188 189 /*** 190 * <p>Checks if the field is a valid date. The pattern is used with 191 * <code>java.text.SimpleDateFormat</code>. If strict is true, then the 192 * length will be checked so '2/12/1999' will not pass validation with 193 * the format 'MM/dd/yyyy' because the month isn't two digits. 194 * The setLenient method is set to <code>false</code> for all.</p> 195 * 196 * @param value The value validation is being performed on. 197 * @param datePattern The pattern passed to <code>SimpleDateFormat</code>. 198 * @param strict Whether or not to have an exact match of the datePattern. 199 */ 200 public static Date formatDate(String value, String datePattern, boolean strict) { 201 Date date = null; 202 203 if (value == null 204 || datePattern == null 205 || datePattern.length() == 0) { 206 return null; 207 } 208 209 try { 210 SimpleDateFormat formatter = new SimpleDateFormat(datePattern); 211 formatter.setLenient(false); 212 213 date = formatter.parse(value); 214 215 if (strict) { 216 if (datePattern.length() != value.length()) { 217 date = null; 218 } 219 } 220 } catch(ParseException e) { 221 // Bad date so return null 222 log.warn(value, e); 223 } 224 225 return date; 226 } 227 228 /*** 229 * <p>Checks if the field is a valid credit card number.</p> 230 * <p>Reference Sean M. Burke's 231 * <a href="http://www.ling.nwu.edu/~sburke/pub/luhn_lib.pl">script</a>.</p> 232 * 233 * @param value The value validation is being performed on. 234 */ 235 public static Long formatCreditCard(String value) { 236 return GenericValidator.isCreditCard(value) ? new Long(value) : null; 237 } 238 239 }

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