package org.webslinger.commons.vfs;

 import java.util.Collection;

 import java.util.HashSet;

 import java.util.Set;

 import org.apache.commons.vfs.Capability;

 import org.apache.commons.vfs.FileName;

 import org.apache.commons.vfs.FileObject;

 import org.apache.commons.vfs.FileSystem;

 import org.apache.commons.vfs.FileSystemException;

 import org.apache.commons.vfs.FileSystemOptions;

 public abstract class FilteringFileSystem<N extends FileName, F extends FilteringFileObject<N, F, S>, S extends FilteringFileSystem<N, F, S>> extends LayeredFileSystem<N, F, S> {

     public final static Capability[] copyCapabilities = new Capability[] {

         Capability.READ_CONTENT,

         Capability.WRITE_CONTENT,

         Capability.RANDOM_ACCESS_READ,

         Capability.RANDOM_ACCESS_WRITE,

         Capability.APPEND_CONTENT,

         Capability.LAST_MODIFIED,

         Capability.GET_LAST_MODIFIED,

         Capability.SET_LAST_MODIFIED_FILE,

         Capability.SET_LAST_MODIFIED_FOLDER,

         // last modified?

         Capability.CREATE,

         Capability.DELETE,

         Capability.RENAME,

         Capability.LIST_CHILDREN

     };

     protected Set<Capability> caps = new HashSet<Capability>();

     public FilteringFileSystem(N name, FileObject root, FileSystemOptions options) throws FileSystemException {

         super(name, root, options);

         FileSystem fs = root.getFileSystem();

         copyCapabilities(root.getFileSystem(), caps);

     }

     public static void copyCapabilities(FileSystem fs, Collection<Capability> caps) {

         for (Capability cap: copyCapabilities) {

             if (fs.hasCapability(cap)) caps.add(cap);

         }

     }

     public void addCapabilities(Collection caps) {

         caps.addAll(this.caps);

     }

 }