package org.webslinger.commons.vfs.virtual;

 import java.net.URL;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.Collections;

 import org.apache.commons.vfs.FileName;

 import org.apache.commons.vfs.FileSystemException;

 import org.webslinger.commons.vfs.operations.COWStateOperation;

 import org.webslinger.commons.vfs.operations.AllFilesOperation;

 public class VirtualCOWStateOperation implements AllFilesOperation, COWStateOperation {

     protected final VirtualFileSystem fs;

     protected final FileName name;

     protected VirtualCOWStateOperation(VirtualFileObject file) {

         fs = file.getFileSystem();

         name = file.getName();

     }

     public final void process() throws FileSystemException {

         throw new UnsupportedOperationException();

     }

     public void clear() throws FileSystemException {

         fs.clear(name);

     }

     public Collection<String> getBases() throws FileSystemException {

         VirtualFileSystem.MountPoint point = fs.getMounts(name);

         if (point == null) return Collections.emptyList();

         FileName parent = name.getParent();

         String[] bases = new String[point.bases.length];

         for (int i = 0; i < bases.length; i++) {

             bases[i] = parent.getRelativeName(point.bases[i].lookupFile().getName());

         }

         return Arrays.asList(bases);

     }

     public boolean addBase(String relative) throws FileSystemException {

         return fs.addBase(name, relative);

     }

     public boolean removeBase(String relative) throws FileSystemException {

         return fs.removeBase(name, relative);

     }

     public boolean isDeleted() throws FileSystemException {

         VirtualFileSystem.MountPoint point = fs.getMounts(name);

         if (point == null) return false;

         return point.isDeleted;

     }

     public void setDeleted(boolean deleted) throws FileSystemException {

         fs.setDeleted(name, deleted, true);

     }

     public Collection<URL> getAllURLs() throws FileSystemException {

         return fs.resolveFile(name).getResolution().getAllURLs();

     }

 }