1 /*
2 * ModeShape (http://www.modeshape.org)
3 * See the COPYRIGHT.txt file distributed with this work for information
4 * regarding copyright ownership. Some portions may be licensed
5 * to Red Hat, Inc. under one or more contributor license agreements.
6 * See the AUTHORS.txt file in the distribution for a full listing of
7 * individual contributors.
8 *
9 * Unless otherwise indicated, all code in ModeShape is licensed
10 * to you under the terms of the GNU Lesser General Public License as
11 * published by the Free Software Foundation; either version 2.1 of
12 * the License, or (at your option) any later version.
13 *
14 * ModeShape is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this software; if not, write to the Free
21 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
23 */
24 package org.modeshape.common.collection;
25
26 import java.util.Iterator;
27
28 /**
29 * An {@link Iterator} implementation that only allows reading elements, used as a wrapper around another iterator to make the
30 * contents immutable to the user of this iterator.
31 *
32 * @param <T> the type of the elements over which the iteration is being performed
33 */
34 public final class ReadOnlyIterator<T> implements Iterator<T> {
35
36 private final Iterator<T> delegate;
37
38 public ReadOnlyIterator( Iterator<T> delegate ) {
39 this.delegate = delegate;
40 assert this.delegate != null;
41 }
42
43 /**
44 * {@inheritDoc}
45 *
46 * @see java.util.Iterator#hasNext()
47 */
48 public boolean hasNext() {
49 return delegate.hasNext();
50 }
51
52 /**
53 * {@inheritDoc}
54 *
55 * @see java.util.Iterator#next()
56 */
57 public T next() {
58 return delegate.next();
59 }
60
61 /**
62 * {@inheritDoc}
63 *
64 * @see java.util.Iterator#remove()
65 */
66 public void remove() {
67 throw new UnsupportedOperationException();
68 }
69
70 }