001package org.eclipse.aether.util.graph.version; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import java.util.Iterator; 023 024import org.eclipse.aether.collection.DependencyCollectionContext; 025import org.eclipse.aether.collection.VersionFilter; 026import org.eclipse.aether.version.Version; 027 028/** 029 * A version filter that excludes any version except the highest one. 030 */ 031public final class HighestVersionFilter 032 implements VersionFilter 033{ 034 035 /** 036 * Creates a new instance of this version filter. 037 */ 038 public HighestVersionFilter() 039 { 040 } 041 042 public void filterVersions( VersionFilterContext context ) 043 { 044 Iterator<Version> it = context.iterator(); 045 for ( boolean hasNext = it.hasNext(); hasNext; ) 046 { 047 it.next(); 048 hasNext = it.hasNext(); 049 if ( hasNext ) 050 { 051 it.remove(); 052 } 053 } 054 } 055 056 public VersionFilter deriveChildFilter( DependencyCollectionContext context ) 057 { 058 return this; 059 } 060 061 @Override 062 public boolean equals( Object obj ) 063 { 064 if ( this == obj ) 065 { 066 return true; 067 } 068 else if ( null == obj || !getClass().equals( obj.getClass() ) ) 069 { 070 return false; 071 } 072 return true; 073 } 074 075 @Override 076 public int hashCode() 077 { 078 return getClass().hashCode(); 079 } 080 081}