package org.webslinger.commons.vfs.util;

 import java.util.Collection;

 import java.util.Map;

 import java.util.Set;

 import java.lang.reflect.Array;

 import org.webslinger.lang.ObjectUtil;

 import org.apache.commons.vfs.FileObject;

 public class FileAttributeEntrySet<F extends FileObject, T> extends FileAttributeCollection<F, T> implements Set<T> {

     public FileAttributeEntrySet(FileAttributeMap<F> fam) {

         super(fam, new IteratorRemover() {

             public boolean remove(Object o) {

                 throw new UnsupportedOperationException("remove");

             }

         });

     }

     public boolean add(T o) {

         throw new UnsupportedOperationException("add");

     }

     public boolean addAll(Collection<? extends T> c) {

         throw new UnsupportedOperationException("addAll");

     }

     public boolean contains(Object o) {

         if (!(o instanceof Map.Entry)) return false;

         Map.Entry entry = (Map.Entry) o;

         if (!(entry.getKey() instanceof String)) return false;

         String name = (String) entry.getKey();

         try {

             if (!resolver.attributeExists(getFile(), name)) return false;

         } catch (Exception e) {

             return false;

         }

         try {

             return ObjectUtil.equalsHelper(entry.getValue(), resolver.getAttribute(getFile(), name));

         } catch (Exception e) {

             return false;

         }

     }

     public <T> T[] toArray(T[] array) {

         try {

             String[] names = resolver.getAttributeNames(getFile());

             if (array.length < names.length) array = (T[]) Array.newInstance(array.getClass().getComponentType(), names.length);

             Object[] result = array;

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

                 result[i] = new FileAttributeEntry<F>(this, names[i]);

             }

             return array;

         } catch (RuntimeException e) {

             throw e;

         } catch (Exception e) {

             return null;

         }

     }

 }