| /* |
| * 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.chemistry.opencmis.client.runtime.util; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| import org.apache.chemistry.opencmis.client.api.ItemIterable; |
| |
| /** |
| * An empty item iterable. |
| */ |
| public class EmptyItemIterable<T> implements ItemIterable<T> { |
| |
| public static final EmptyItemIterable<?> INSTANCE = new EmptyItemIterable<Object>(); |
| |
| @SuppressWarnings("unchecked") |
| public static <U> EmptyItemIterable<U> instance() { |
| return (EmptyItemIterable<U>) INSTANCE; |
| } |
| |
| public ItemIterable<T> skipTo(long position) { |
| if (position != 0) { |
| throw new IllegalArgumentException(String.valueOf(position)); |
| } |
| return this; |
| } |
| |
| public ItemIterable<T> getPage() { |
| return this; |
| } |
| |
| public ItemIterable<T> getPage(int maxNumItems) { |
| return this; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public Iterator<T> iterator() { |
| return (Iterator<T>) EmptyIterator.INSTANCE; |
| } |
| |
| public long getPageNumItems() { |
| return 0; |
| } |
| |
| public boolean getHasMoreItems() { |
| return false; |
| } |
| |
| public long getTotalNumItems() { |
| return 0; |
| } |
| |
| /** |
| * An empty iterator. |
| */ |
| public static class EmptyIterator<V> implements Iterator<V> { |
| public static final Iterator<?> INSTANCE = new EmptyIterator<Object>(); |
| |
| public boolean hasNext() { |
| return false; |
| } |
| |
| public V next() { |
| throw new NoSuchElementException(); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| } |