/*

  * Copyright 2007 The Kuali Foundation Licensed under the Educational Community

  * License, Version 1.0 (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/ecl1.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.

  */

 package org.kuali.rice.kns.web.spring;

 import java.beans.PropertyEditorSupport;

 import java.sql.Date;

 import java.text.ParseException;

 import java.util.Calendar;

 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.util.RiceKeyConstants;

 import org.kuali.rice.core.web.format.FormatException;

 /**

  * This PropertyEditor converts between date display strings and

  * <code>java.sql.Date</code> objects.

  * 

  * @author Kuali Rice Team (rice.collab@kuali.org)

  */

 public class UifDateEditor extends PropertyEditorSupport {

     /** The date time service. */

     private transient DateTimeService dateTimeService;

     /**

      * This overridden method uses the

      * <code>org.kuali.rice.core.api.datetime.DateTimeService</code> to convert

      * the date object to the display string.

      * 

      * @see java.beans.PropertyEditorSupport#getAsText()

      */

     @Override

     public String getAsText() {

         if (this.getValue() == null) {

             return null;

         }

         if ("".equals(this.getValue())) {

             return null;

         }

         return getDateTimeService().toDateString((java.util.Date) this.getValue());

     }

     /**

      * Gets the date time service.

      * 

      * @return the date time service

      */

     protected DateTimeService getDateTimeService() {

         if (this.dateTimeService == null) {

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

         }

         return this.dateTimeService;

     }

     /**

      * This overridden method converts the display string to a

      * <code>java.sql.Date</code> object using the

      * <code>org.kuali.rice.core.api.datetime.DateTimeService</code>.

      * 

      * @see java.beans.PropertyEditorSupport#setAsText(java.lang.String)

      */

     @Override

     public void setAsText(String text) throws IllegalArgumentException {

         this.setValue(convertToObject(text));

     }

     /**

      * Convert display text to <code>java.sql.Date</code> object using the

      * <code>org.kuali.rice.core.api.datetime.DateTimeService</code>.

      * 

      * @param text

      *            the display text

      * @return the <code>java.sql.Date</code> object

      * @throws IllegalArgumentException

      *             the illegal argument exception

      */

     protected Object convertToObject(String text) throws IllegalArgumentException {

         try {

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

             Calendar calendar = Calendar.getInstance();

             calendar.setTime(result);

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

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

             }

             return result;

         } catch (ParseException e) {

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

         }

     }

     /**

      * 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;

     }

 }