1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.chemistry.opencmis.client.runtime.util;
20
21 import java.util.List;
22
23 import org.apache.chemistry.opencmis.client.runtime.util.AbstractPageFetcher.Page;
24
25 /**
26 * Iterator for iterating over a page of items in a CMIS Collection.
27 *
28 * @param <T>
29 */
30 public class CollectionPageIterator<T> extends AbstractIterator<T> {
31
32 /**
33 * Constructor.
34 */
35 public CollectionPageIterator(long skipCount, AbstractPageFetcher<T> pageFetcher) {
36 super(skipCount, pageFetcher);
37 }
38
39 @Override
40 public boolean hasNext() {
41 Page<T> page = getCurrentPage();
42 if (page == null) {
43 return false;
44 }
45
46 List<T> items = page.getItems();
47 if (items == null || getSkipOffset() >= items.size()) {
48 return false;
49 }
50
51 return true;
52 }
53
54 @Override
55 public T next() {
56 Page<T> page = getCurrentPage();
57 if (page == null) {
58 return null;
59 }
60
61 List<T> items = page.getItems();
62 if (items == null || items.isEmpty() || getSkipOffset() == items.size()) {
63 return null;
64 }
65
66 return items.get(incrementSkipOffset());
67 }
68 }