| // *************************************************************************************************************************** |
| // * 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.juneau.internal; |
| |
| import java.util.*; |
| |
| /** |
| * Implements a reversed iteration {@link Iterable} without altering the underlying list. |
| * |
| * @param <T> The entry type. |
| */ |
| public class ReverseIterable<T> implements Iterable<T> { |
| private final List<T> list; |
| |
| /** |
| * Constructor |
| * |
| * @param list The original list. |
| */ |
| public ReverseIterable(List<T> list) { |
| this.list = list; |
| } |
| |
| /** |
| * Convenience method for constructing instances. |
| * |
| * @param list The original list. |
| * @return A new {@link ReverseIterable}. |
| */ |
| public static <T> ReverseIterable<T> of(List<T> list) { |
| return new ReverseIterable<>(list); |
| } |
| |
| /** |
| * Convenience method for constructing instances. |
| * |
| * @param list The original list. |
| * @return A new {@link ReverseIterable}. |
| */ |
| public static <T> ReverseIterable<T> of(T[] list) { |
| return new ReverseIterable<>(Arrays.asList(list)); |
| } |
| |
| @Override |
| public Iterator<T> iterator() { |
| final ListIterator<T> i = list.listIterator(list.size()); |
| |
| return new Iterator<T>() { |
| @Override |
| public boolean hasNext() { return i.hasPrevious(); } |
| @Override |
| public T next() { return i.previous(); } |
| @Override |
| public void remove() { i.remove(); } |
| }; |
| } |
| } |