Java tutorial
/* * 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. */ package org.apache.commons.validator; 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: 1739358 $ * @since Validator 1.1 * @deprecated Use the new DateValidator, CalendarValidator or TimeValidator in the * routines package. This class will be removed in a future release. */ @Deprecated 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; } }