package org.webslinger.commons.vfs;

 import java.io.IOException;

 import java.util.Set;

 import java.util.TreeSet;

 import org.apache.commons.vfs.FileName;

 import org.apache.commons.vfs.FileObject;

 import org.webslinger.util.TTLObject;

 public class ReloadingCachingLister extends TTLObject<Set<String>> implements CachingLister {

     static {

         TTLObject.setDefaultTTLForClass(ReloadingCachingLister.class, 1000);

     }

     private final FileObject dir;

     public ReloadingCachingLister(FileObject dir) {

         this.dir = dir;

     }

     public Set<String> getNames() throws IOException {

         return getObject();

     }

     public FileObject getDir() {

         return dir;

     }

     protected Set<String> load(Set<String> oldNames) throws IOException {

         dir.refresh();

         FileObject[] children = dir.getChildren();

         TreeSet<String> names = new TreeSet<String>();

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

             FileName name = children[i].getName();

             String baseName = name.getBaseName();

             String extension = name.getExtension();

             if (extension.length() > 0) baseName = baseName.substring(0, baseName.length() - extension.length() - 1);

             if (baseName.equals("index")) continue;

             if (baseName.startsWith(".")) continue;

             names.add(baseName);

         }

         return names;

     }

 }