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