1 /**
2 * This file Copyright (c) 2011 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.jcr.iterator;
35
36 import java.util.Collection;
37 import java.util.Iterator;
38 import javax.jcr.RangeIterator;
39
40 /**
41 * Intended as a base class when implementing JCR iterators, sub-classes need only implement the special next methods
42 * such as nextNode() for NodeIterator.
43 *
44 * @param <T>
45 * @version $Id$
46 */
47 public class RangeIteratorImpl<T> implements RangeIterator {
48
49 private final Iterator<T> iterator;
50 private final long size;
51 private long position = 0;
52
53 public RangeIteratorImpl(Collection<T> collection) {
54 this.iterator = collection.iterator();
55 this.size = collection.size();
56 }
57
58 public RangeIteratorImpl(RangeIterator rangeIterator) {
59 this.iterator = rangeIterator;
60 this.size = rangeIterator.getSize();
61 this.position = rangeIterator.getPosition();
62 }
63
64 public RangeIteratorImpl(Iterator<T> iterator, int size) {
65 this.iterator = iterator;
66 this.size = size;
67 }
68
69 @Override
70 public void skip(long skipNum) {
71 while (skipNum > 0) {
72 next();
73 skipNum--;
74 }
75 }
76
77 @Override
78 public long getSize() {
79 return size;
80 }
81
82 @Override
83 public long getPosition() {
84 return position;
85 }
86
87 @Override
88 public boolean hasNext() {
89 return iterator.hasNext();
90 }
91
92 @Override
93 public T next() {
94 return nextElement();
95 }
96
97 @Override
98 public void remove() {
99 iterator.remove();
100 }
101
102 protected T nextElement() {
103 T element = iterator.next();
104 position++;
105 return element;
106 }
107 }