/**

  * Copyright 2005-2011 The Kuali Foundation

  *

  * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php

  *

  * 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.

  */

 // begin Kuali Foundation modification

 package org.kuali.rice.core.web.format;

 // end Kuali Foundation modification

 // begin Kuali Foundation modification

 // import order changed, and java.util.Calendar, org.kuali.KeyConstants and org.kuali.rice.kradServiceLocatorInternal added

 import org.kuali.rice.core.api.CoreConstants;

 import org.kuali.rice.core.api.datetime.DateTimeService;

 import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;

 import org.kuali.rice.core.api.util.RiceKeyConstants;

 import java.sql.Date;

 import java.text.ParseException;

 import java.util.Calendar;

 /**

  * begin Kuali Foundation modification

  * This class is used to format Date objects.

  * end Kuali Foundation modification

  */

 public class DateFormatter extends Formatter {

     private static final long serialVersionUID = 7612442662886603084L;

     private transient DateTimeService dateTimeService;

     /**

      * For a given user input date, this method returns the exact string the user entered after the last slash. This allows the

      * formatter to distinguish between ambiguous values such as "/06" "/6" and "/0006"

      *

      * @param date

      * @return

      */

     private String verbatimYear(String date) {

         String result = "";

         int pos = date.lastIndexOf("/");

         if (pos >= 0) {

             result = date.substring(pos);

         }

         return result;

     }

     // end Kuali Foundation modification

     /**

      * Unformats its argument and return a java.util.Date instance initialized with the resulting string.

      *

      * @return a java.util.Date intialized with the provided string

      */

     protected Object convertToObject(String target) {

         // begin Kuali Foundation modification

         try {

             Date result = getDateTimeService().convertToSqlDate(target);

             Calendar calendar = Calendar.getInstance();

             calendar.setTime(result);

             if (calendar.get(Calendar.YEAR) < 1000 && verbatimYear(target).length() < 4) {

                 throw new FormatException("illegal year format", RiceKeyConstants.ERROR_DATE, target);

             }

             return result;

         } catch (ParseException e) {

             throw new FormatException("parsing", RiceKeyConstants.ERROR_DATE, target, e);

         }

         // end Kuali Foundation modification

     }

     /**

      * Returns a string representation of its argument, formatted as a date with the "MM/dd/yyyy" format.

      *

      * @return a formatted String

      */

     public Object format(Object value) {

         if (value == null) {

             return null;

         }

         // begin Kuali Foundation modification

         if ("".equals(value)) {

             return null;

         }

         return getDateTimeService().toDateString((java.util.Date) value);

         // end Kuali Foundation modification

     }

     /**

      * This method is invoked to validate a date string using the KNS Service

      * DateTimeService.

      *

      * @param dateString

      * @return

      */

     public boolean validate(String dateString) {

         boolean isValid = false;

         try {

             getDateTimeService().convertToSqlTimestamp(dateString);

             isValid = true;

         } catch (Exception e) {

         }

         return isValid;

     }

     protected DateTimeService getDateTimeService() {

             if (this.dateTimeService == null) {

                     this.dateTimeService = GlobalResourceLoader.getService(CoreConstants.Services.DATETIME_SERVICE);

             }

             return this.dateTimeService;

     }

 }