package org.webslinger.commons.vfs.cow;

 import java.io.IOException;

 import java.lang.ref.SoftReference;

 import org.apache.commons.vfs.FileName;

 import org.apache.commons.vfs.FileObject;

 import org.apache.commons.vfs.FileSystemException;

 import org.webslinger.commons.vfs.GenerationalFileObject;

 public class COWFileObject extends GenerationalFileObject<FileName, COWFileObject, COWFileSystem.COWResolution, COWFileSystem> {

     private SoftReference<FileObject> parentLayerFile;

     public COWFileObject(FileName name, COWFileSystem cfs) {

         super(name, cfs);

     }

     FileObject getFile() throws FileSystemException {

         return getFile(false);

     }

     synchronized FileObject getParentLayerFile() throws FileSystemException {

         FileObject parentFile;

         if (parentLayerFile != null) {

             parentFile = parentLayerFile.get();

             if (parentFile != null) return parentFile;

         }

         parentFile = getFileSystem().getParentLayer().resolveFile(getName().getPath().substring(1));

         parentLayerFile = new SoftReference<FileObject>(parentFile);

         return parentFile;

     }

     public FileObject[] getAllFiles() throws FileSystemException {

         return getResolution(false).getFiles();

     }

     public COWEntry getCOWEntry() throws IOException {

         return fs.getCOWEntry(getName().getPath());

     }

 }