| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.commons.collections4.iterators; |
| |
| import java.util.ListIterator; |
| |
| import org.apache.commons.collections4.ResettableListIterator; |
| |
| /** |
| * Provides an implementation of an empty list iterator. |
| * <p> |
| * This class provides an implementation of an empty list iterator. This class |
| * provides for binary compatibility between Commons Collections 2.1.1 and 3.1 |
| * due to issues with {@code IteratorUtils}. |
| * |
| * @param <E> the type of elements returned by this iterator. |
| * @since 2.1.1 and 3.1 |
| */ |
| public class EmptyListIterator<E> extends AbstractEmptyIterator<E> implements |
| ResettableListIterator<E> { |
| |
| /** |
| * Singleton instance of the iterator. |
| * @since 3.1 |
| */ |
| @SuppressWarnings("rawtypes") |
| public static final ResettableListIterator RESETTABLE_INSTANCE = new EmptyListIterator<>(); |
| |
| /** |
| * Singleton instance of the iterator. |
| * @since 2.1.1 and 3.1 |
| */ |
| @SuppressWarnings("rawtypes") |
| public static final ListIterator INSTANCE = RESETTABLE_INSTANCE; |
| |
| /** |
| * Get a typed instance of the iterator. |
| * @param <E> the element type |
| * @return {@link ResettableListIterator}<E> |
| */ |
| public static <E> ResettableListIterator<E> resettableEmptyListIterator() { |
| return RESETTABLE_INSTANCE; |
| } |
| |
| /** |
| * Get a typed instance of the iterator. |
| * @param <E> the element type |
| * @return {@link ListIterator}<E> |
| */ |
| public static <E> ListIterator<E> emptyListIterator() { |
| return INSTANCE; |
| } |
| |
| /** |
| * Constructor. |
| */ |
| protected EmptyListIterator() { |
| } |
| |
| } |