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

 /*

  * 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.XMLException;

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

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

 import org.jtheque.primary.utils.web.analyzers.generic.position.Position;

 import org.jtheque.primary.utils.web.analyzers.generic.position.PositionFactory;

 /**

  * @author Baptiste Wicht

  */

 final class SimpleValueGetterFactory implements Factory<ValueGetter> {

         @Override

         public boolean canFactor(Element element, XMLReader reader) throws XMLException{

                 return !reader.getNodes("value", element).isEmpty();

         }

         @Override

         public ValueGetter factor(Element element, XMLReader reader) throws XMLException{

                 SimpleValueGetter simpleGetter = new SimpleValueGetter();

                 simpleGetter.setEnd(getPosition(element, "end", reader));

                 simpleGetter.setStart(getPosition(element, "start", reader));

                 return simpleGetter;

         }

         /**

          * Return the position contained in a specific location of a specific node.

          *

          * @param currentNode The node to search in.

          * @param location The location to search in.

          * @param reader The XML reader.

          *

          * @return The Position or null if we doesn't found one.

          *

          * @throws XMLException If an errors occurs during the parse of the XML Elements.

          */

         private static Position getPosition(Object currentNode, String location, XMLReader reader) throws XMLException{

                 Object positionNode = reader.getNode("value/" + location, currentNode);

                 if (positionNode != null){

                         Element node = reader.getNode("*", positionNode);

                         if (node != null){

                                 return PositionFactory.getPosition(node, reader);

                         }

                 }

                 return null;

         }

         /**

          * A simple value getter. It seems a getter who takes a value from a start position to an end

          * position.

          *

          * @author Baptiste Wicht

          */

         private static final class SimpleValueGetter implements ValueGetter {

                 private Position start;

                 private Position end;

                 /**

                  * Set the start position.

                  *

                  * @param start The start position.

                  */

                 public void setStart(Position start){

                         this.start = start;

                 }

                 /**

                  * Set the end position.

                  *

                  * @param end The end position.

                  */

                 public void setEnd(Position end){

                         this.end = end;

                 }

                 @Override

                 public String getValue(String line){

                         return line.substring(start.intValue(line), end.intValue(line));

                 }

                 @Override

                 public String toString(){

                         return "SimpleValueGetter{" +

                                         "start=" + start +

                                         ", end=" + end +

                                         '}';

                 }

         }

 }