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 * ModeShape is free software. Unless otherwise indicated, all code in ModeShape
10 * is licensed 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.jcr;
25
26 import java.util.Collection;
27 import java.util.Iterator;
28 import javax.jcr.Property;
29 import javax.jcr.PropertyIterator;
30 import net.jcip.annotations.Immutable;
31 import org.modeshape.common.util.CheckArg;
32
33 /**
34 * ModeShape implementation of a {@link PropertyIterator}.
35 */
36 @Immutable
37 final class JcrPropertyIterator implements PropertyIterator {
38
39 private final Iterator<? extends Property> iterator;
40 private int ndx;
41 private int size;
42
43 JcrPropertyIterator( Collection<? extends Property> properties ) {
44 assert properties != null;
45 iterator = properties.iterator();
46 size = properties.size();
47 }
48
49 /**
50 * {@inheritDoc}
51 *
52 * @see javax.jcr.RangeIterator#getPosition()
53 */
54 public long getPosition() {
55 return ndx;
56 }
57
58 /**
59 * {@inheritDoc}
60 *
61 * @see javax.jcr.RangeIterator#getSize()
62 */
63 public long getSize() {
64 return size;
65 }
66
67 /**
68 * {@inheritDoc}
69 *
70 * @see java.util.Iterator#hasNext()
71 */
72 public boolean hasNext() {
73 return iterator.hasNext();
74 }
75
76 /**
77 * {@inheritDoc}
78 *
79 * @see java.util.Iterator#next()
80 */
81 public Object next() {
82 return nextProperty();
83 }
84
85 /**
86 * {@inheritDoc}
87 *
88 * @see javax.jcr.PropertyIterator#nextProperty()
89 */
90 public Property nextProperty() {
91 Property next = iterator.next();
92 ndx++;
93 return next;
94 }
95
96 /**
97 * {@inheritDoc}
98 *
99 * @throws UnsupportedOperationException always
100 * @see java.util.Iterator#remove()
101 */
102 public void remove() {
103 throw new UnsupportedOperationException();
104 }
105
106 /**
107 * {@inheritDoc}
108 *
109 * @throws IllegalArgumentException if <code>count</code> is negative.
110 * @see javax.jcr.RangeIterator#skip(long)
111 */
112 public void skip( long count ) {
113 CheckArg.isNonNegative(count, "count");
114 while (--count >= 0) {
115 nextProperty();
116 }
117 }
118 }