Mega Code Archive
Perform date validations
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/*
* 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.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Locale;
/**
* <p>Perform date validations.</p>
* <p>
* This class is a Singleton; you can retrieve the instance via the
* getInstance() method.
* </p>
*
* @version $Revision: 478334 $ $Date: 2006-11-22 21:31:54 +0000 (Wed, 22 Nov 2006) $
* @since Validator 1.1
*/
public class DateValidator {
/**
* Singleton instance of this class.
*/
private static final DateValidator DATE_VALIDATOR = new DateValidator();
/**
* Returns the Singleton instance of this validator.
* @return A singleton instance of the DateValidator.
*/
public static DateValidator getInstance() {
return DATE_VALIDATOR;
}
/**
* Protected constructor for subclasses to use.
*/
protected DateValidator() {
super();
}
/**
* <p>Checks if the field is a valid date. The pattern is used with
* <code>java.text.SimpleDateFormat</code>. If strict is true, then the
* length will be checked so '2/12/1999' will not pass validation with
* the format 'MM/dd/yyyy' because the month isn't two digits.
* The setLenient method is set to <code>false</code> for all.</p>
*
* @param value The value validation is being performed on.
* @param datePattern The pattern passed to <code>SimpleDateFormat</code>.
* @param strict Whether or not to have an exact match of the datePattern.
* @return true if the date is valid.
*/
public boolean isValid(String value, String datePattern, boolean strict) {
if (value == null
|| datePattern == null
|| datePattern.length() <= 0) {
return false;
}
SimpleDateFormat formatter = new SimpleDateFormat(datePattern);
formatter.setLenient(false);
try {
formatter.parse(value);
} catch(ParseException e) {
return false;
}
if (strict && (datePattern.length() != value.length())) {
return false;
}
return true;
}
/**
* <p>Checks if the field is a valid date. The <code>Locale</code> is
* used with <code>java.text.DateFormat</code>. The setLenient method
* is set to <code>false</code> for all.</p>
*
* @param value The value validation is being performed on.
* @param locale The locale to use for the date format, defaults to the default
* system default if null.
* @return true if the date is valid.
*/
public boolean isValid(String value, Locale locale) {
if (value == null) {
return false;
}
DateFormat formatter = null;
if (locale != null) {
formatter = DateFormat.getDateInstance(DateFormat.SHORT, locale);
} else {
formatter =
DateFormat.getDateInstance(
DateFormat.SHORT,
Locale.getDefault());
}
formatter.setLenient(false);
try {
formatter.parse(value);
} catch(ParseException e) {
return false;
}
return true;
}
}
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