1 package org.eclipse.aether.util.graph.version;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.util.Iterator;
23
24 import org.eclipse.aether.collection.DependencyCollectionContext;
25 import org.eclipse.aether.collection.VersionFilter;
26 import org.eclipse.aether.version.Version;
27
28 /**
29 * A version filter that excludes any version except the highest one.
30 */
31 public final class HighestVersionFilter
32 implements VersionFilter
33 {
34
35 /**
36 * Creates a new instance of this version filter.
37 */
38 public HighestVersionFilter()
39 {
40 }
41
42 public void filterVersions( VersionFilterContext context )
43 {
44 Iterator<Version> it = context.iterator();
45 for ( boolean hasNext = it.hasNext(); hasNext; )
46 {
47 it.next();
48 hasNext = it.hasNext();
49 if ( hasNext )
50 {
51 it.remove();
52 }
53 }
54 }
55
56 public VersionFilter deriveChildFilter( DependencyCollectionContext context )
57 {
58 return this;
59 }
60
61 @Override
62 public boolean equals( Object obj )
63 {
64 if ( this == obj )
65 {
66 return true;
67 }
68 else if ( null == obj || !getClass().equals( obj.getClass() ) )
69 {
70 return false;
71 }
72 return true;
73 }
74
75 @Override
76 public int hashCode()
77 {
78 return getClass().hashCode();
79 }
80
81 }