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 package org.netbeans.modules.refactoring.ruby;

 import java.io.IOException;

 import java.lang.ref.WeakReference;

 import org.netbeans.modules.csl.spi.support.ModificationResult;

 import org.netbeans.modules.csl.spi.support.ModificationResult.Difference;

 import org.netbeans.modules.refactoring.spi.SimpleRefactoringElementImplementation;

 import org.openide.filesystems.FileLock;

 import org.openide.filesystems.FileObject;

 import org.openide.text.PositionBounds;

 import org.openide.util.Exceptions;

 import org.openide.util.Lookup;

 import org.openide.util.lookup.Lookups;

 /**

  *

  * @author Jan Becicka

  */

  public class DiffElement extends SimpleRefactoringElementImplementation {

     private PositionBounds bounds;

     private String displayText;

     private FileObject parentFile;

     private Difference diff;

     private ModificationResult modification;

     private WeakReference<String> newFileContent;

     public DiffElement(Difference diff, PositionBounds bounds, FileObject parentFile, ModificationResult modification) {

         this.bounds = bounds;

         this.displayText = diff.getDescription();

         this.parentFile = parentFile;

         this.diff = diff;

         this.modification = modification;

     }

     @Override

     public String getDisplayText() {

         return displayText;

     }

     @Override

     public Lookup getLookup() {

 //        Object composite = ElementGripFactory.getDefault().get(parentFile, bounds.getBegin().getOffset());

 //        if (composite==null)

 //            composite = parentFile;

 //        return Lookups.fixed(composite, diff);

         return Lookups.fixed(diff);

     }

     @Override

     public void setEnabled(boolean enabled) {

         diff.exclude(!enabled);

         newFileContent = null;

         super.setEnabled(enabled);

     }

     @Override

     public PositionBounds getPosition() {

         return bounds;

     }

     public String getText() {

         return displayText;

     }

     @Override

     public void performChange() {

         String oldFileName = diff.getOldText();

         String newFileName = diff.getNewText();

         if (parentFile.getName().equals(oldFileName)) {

             try {

                 FileLock fileLock = parentFile.lock();

                 parentFile.rename(fileLock, newFileName, "ruby"); // NOI18N

                 fileLock.releaseLock();

             } catch (IOException e) {

                 Exceptions.printStackTrace(e);

             }

         }

     }

     @Override

     public FileObject getParentFile() {

         return parentFile;

     }

     @Override

     protected String getNewFileContent() {

         String result;

         if (newFileContent !=null) {

             result = newFileContent.get();

             if (result!=null)

                 return result;

         }

         try {

             result = modification.getResultingSource(parentFile);

         } catch (IOException ex) {

             Exceptions.printStackTrace(ex);

             return null;

         }

         newFileContent = new WeakReference<String>(result);

         return result;

     }

     public static DiffElement create(Difference diff, FileObject fileObject, ModificationResult modification) {

         PositionBounds bounds = new PositionBounds(diff.getStartPosition(), diff.getEndPosition());

         return new DiffElement(diff, bounds, fileObject, modification);

     }    

 }