package org.jtheque.primary.utils.web.analyzers.generic.transform;

 /*

  * This file is part of JTheque.

  *            

  * JTheque is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License. 

  *

  * JTheque is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with JTheque.  If not, see <http://www.gnu.org/licenses/>.

  */

 import org.jdom.Element;

 import org.jtheque.core.utils.file.XMLReader;

 import org.jtheque.primary.utils.web.analyzers.generic.Factory;

 /**

  * @author Baptiste Wicht

  */

 final class LastFactory implements Factory<Transformer> {

         @Override

         public boolean canFactor(Element element, XMLReader reader){

                 return "last".equals(element.getName());

         }

         @Override

         public Transformer factor(Element element, XMLReader reader){

                 return new Last(Integer.parseInt(element.getText()));

         }

         /**

          * A Transformer who takes only the X last chars or the value.

          *

          * @author Baptiste Wicht

          */

         private static final class Last implements Transformer {

                 private final int last;

                 /**

                  * Construct a new Last object.

                  *

                  * @param cut The number of chars to get.

                  */

                 private Last(int cut){

                         super();

                         last = cut;

                 }

                 @Override

                 public String transform(String value){

                         return value.substring(value.length() - last);

                 }

                 @Override

                 public String toString(){

                         return "Last{" +

                                         "last=" + last +

                                         '}';

                 }

         }

 }