| // GenericsNote: Converted. |
| /* |
| * Copyright 2004 The Apache Software Foundation |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.jivesoftware.smack.util.collections; |
| |
| import java.util.NoSuchElementException; |
| |
| /** |
| * Provides an implementation of an empty iterator. |
| * |
| * @author Matt Hall, John Watkinson, Stephen Colebourne |
| * @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:24 $ |
| * @since Commons Collections 3.1 |
| */ |
| abstract class AbstractEmptyIterator <E> { |
| |
| /** |
| * Constructor. |
| */ |
| protected AbstractEmptyIterator() { |
| super(); |
| } |
| |
| public boolean hasNext() { |
| return false; |
| } |
| |
| public E next() { |
| throw new NoSuchElementException("Iterator contains no elements"); |
| } |
| |
| public boolean hasPrevious() { |
| return false; |
| } |
| |
| public E previous() { |
| throw new NoSuchElementException("Iterator contains no elements"); |
| } |
| |
| public int nextIndex() { |
| return 0; |
| } |
| |
| public int previousIndex() { |
| return -1; |
| } |
| |
| public void add(E obj) { |
| throw new UnsupportedOperationException("add() not supported for empty Iterator"); |
| } |
| |
| public void set(E obj) { |
| throw new IllegalStateException("Iterator contains no elements"); |
| } |
| |
| public void remove() { |
| throw new IllegalStateException("Iterator contains no elements"); |
| } |
| |
| public E getKey() { |
| throw new IllegalStateException("Iterator contains no elements"); |
| } |
| |
| public E getValue() { |
| throw new IllegalStateException("Iterator contains no elements"); |
| } |
| |
| public E setValue(E value) { |
| throw new IllegalStateException("Iterator contains no elements"); |
| } |
| |
| public void reset() { |
| // do nothing |
| } |
| |
| } |