Reusable DateColumn component

[Edgar Merino]

Hello, a few days ago someone requested some advice on how to format the 
date within an IColumn, I suggested DateColumn that depended on his 
code, but I've been having this necessity in several ocassions too, so 
I've come up with a true reusable DateColumn component that inherits 
from PropertyColumn, so using it is as simple as:

(DateColumn class shown below)
List<IColumn> cols = new ArrayList<IColumn>();
cols.add(new DateColumn(new Model("header title"), "propertyExpression"));

No extra code needed, regards.
Edgar Merino


import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

import org.apache.wicket.model.IModel;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.lang.PropertyResolver;
import 
org.apache.wicket.extensions.markup.html.repeater.data.table.PropertyColumn;

/**
* PropertyColumn descendent, used to apply a format to a Date field to 
be displayed
* by a Label in a DataTable
*
* @author Edgar Merino
*/
public class DateColumn extends PropertyColumn {       
   public  static final String DEFAULT_DATE_PATTERN = "dd MMM yyyy '@' 
hh:mm a";
   private String datePattern;               
  
   public DateColumn(IModel displayModel, String propertyExpression) {
       this(displayModel, DEFAULT_DATE_PATTERN, propertyExpression);
   }       
  
   public DateColumn(IModel displayModel, String datePattern, String 
propertyExpression) {
       this(displayModel, null, datePattern, propertyExpression);
   }
  
   public DateColumn(IModel displayModel, String sortProperty, String 
datePattern, String propertyExpression) {
       super(displayModel, propertyExpression);       
       this.datePattern = datePattern;
   }

   @Override
   protected IModel createLabelModel(IModel itemModel) {
       Date date = (Date) 
PropertyResolver.getValue(getPropertyExpression(), itemModel.getObject());
       SimpleDateFormat df = (SimpleDateFormat) 
DateFormat.getDateInstance();
       df.applyPattern(datePattern);
      
       return new Model(df.format(date));
   }
}


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