// 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 php.runtime.common.collections.iterators; 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 } }