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.eclipse.aether.util.graph.version;
20
21 import java.util.Iterator;
22
23 import org.eclipse.aether.collection.DependencyCollectionContext;
24 import org.eclipse.aether.collection.VersionFilter;
25 import org.eclipse.aether.version.Version;
26
27 /**
28 * A version filter that excludes any version except the highest one.
29 */
30 public final class HighestVersionFilter implements VersionFilter {
31
32 /**
33 * Creates a new instance of this version filter.
34 */
35 public HighestVersionFilter() {}
36
37 @Override
38 public void filterVersions(VersionFilterContext context) {
39 Iterator<Version> it = context.iterator();
40 for (boolean hasNext = it.hasNext(); hasNext; ) {
41 it.next();
42 hasNext = it.hasNext();
43 if (hasNext) {
44 it.remove();
45 }
46 }
47 }
48
49 @Override
50 public VersionFilter deriveChildFilter(DependencyCollectionContext context) {
51 return this;
52 }
53
54 @Override
55 public boolean equals(Object obj) {
56 if (this == obj) {
57 return true;
58 } else if (null == obj || !getClass().equals(obj.getClass())) {
59 return false;
60 }
61 return true;
62 }
63
64 @Override
65 public int hashCode() {
66 return getClass().hashCode();
67 }
68 }