package org.webslinger.commons.vfs.util;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.List;

 import java.util.NoSuchElementException;

 import java.util.Set;

 import org.apache.commons.vfs.FileObject;

 public abstract class FileAttributeCollection<F extends FileObject, T> extends FileAttributeBaseWrapper<F> implements Collection<T>, IteratorOwner {

     protected FileAttributeMap<F> fam;

     protected int serialNumber;

     protected IteratorRemover remover;

     protected FileAttributeCollection(FileAttributeMap<F> fam, IteratorRemover remover) {

         super(fam);

         this.fam = fam;

         this.remover = remover;

     }

     public void clear() {

         fam.clear();

     }

     public void modified() {

         serialNumber++;

     }

     public int getSerialNumber() {

         return serialNumber;

     }

     public boolean containsAll(Collection<?> c) {

         Iterator<?> it = c.iterator();

         try {

             while (true) {

                 if (!contains(it.next())) return false;

             }

         } catch (NoSuchElementException e) {

             return true;

         }

     }

     public Iterator<T> iterator() {

         return new IteratorWrapper<T>(((List<T>) Arrays.asList(toArray())).iterator(), remover, this);

     }

     public boolean remove(Object o) {

         boolean result = remover.remove(o);

         if (result) serialNumber++;

         return result;

     }

     public boolean removeAll(Collection c) {

         Iterator it = c.iterator();

         int localNumber = serialNumber;

         try {

             while (true) {

                 remove(it.next());

             }

         } catch (NoSuchElementException e) {

             return localNumber != serialNumber;

         }

     }

     public boolean retainAll(Collection<?> c) {

         Set<?> toRetain = new HashSet<Object>(c);

         int localNumber = serialNumber;

         for (Object item: toArray()) {

             if (!toRetain.contains(item)) {

                 remove(item);

             }

         }

         return localNumber != serialNumber;

     }

     public int size() {

         try {

             return resolver.getAttributeNames(getFile()).length;

         } catch (Exception e) {

             return 0;

         }

     }

     public boolean equals(Object other) {

         if (!(other instanceof FileAttributeCollection)) return false;

         FileAttributeCollection fac = (FileAttributeCollection) other;

         return resolver.equals(fac.resolver) && getClass().equals(fac.getClass());

     }

     public int hashCode() {

         return getClass().hashCode() ^ resolver.hashCode();

     }

     public boolean isEmpty() {

         return size() == 0;

     }

     public Object[] toArray() {

         return toArray(new Object[size()]);

     }

 }