001package org.eclipse.aether.util.filter; 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.Collection; 023import java.util.Collections; 024import java.util.LinkedHashSet; 025import java.util.List; 026import java.util.Set; 027 028import org.eclipse.aether.graph.DependencyFilter; 029import org.eclipse.aether.graph.DependencyNode; 030 031/** 032 * A dependency filter that combines zero or more other filters using a logical {@code AND}. The resulting filter 033 * accepts a given dependency node if and only if all constituent filters accept it. 034 */ 035public final class AndDependencyFilter 036 implements DependencyFilter 037{ 038 039 private final Set<DependencyFilter> filters = new LinkedHashSet<DependencyFilter>(); 040 041 /** 042 * Creates a new filter from the specified filters. Prefer {@link #newInstance(DependencyFilter, DependencyFilter)} 043 * if any of the input filters might be {@code null}. 044 * 045 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements. 046 */ 047 public AndDependencyFilter( DependencyFilter... filters ) 048 { 049 if ( filters != null ) 050 { 051 Collections.addAll( this.filters, filters ); 052 } 053 } 054 055 /** 056 * Creates a new filter from the specified filters. 057 * 058 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements. 059 */ 060 public AndDependencyFilter( Collection<DependencyFilter> filters ) 061 { 062 if ( filters != null ) 063 { 064 this.filters.addAll( filters ); 065 } 066 } 067 068 /** 069 * Creates a new filter from the specified filters. 070 * 071 * @param filter1 The first filter to combine, may be {@code null}. 072 * @param filter2 The second filter to combine, may be {@code null}. 073 * @return The combined filter or {@code null} if both filter were {@code null}. 074 */ 075 public static DependencyFilter newInstance( DependencyFilter filter1, DependencyFilter filter2 ) 076 { 077 if ( filter1 == null ) 078 { 079 return filter2; 080 } 081 else if ( filter2 == null ) 082 { 083 return filter1; 084 } 085 return new AndDependencyFilter( filter1, filter2 ); 086 } 087 088 public boolean accept( DependencyNode node, List<DependencyNode> parents ) 089 { 090 for ( DependencyFilter filter : filters ) 091 { 092 if ( !filter.accept( node, parents ) ) 093 { 094 return false; 095 } 096 } 097 return true; 098 } 099 100 @Override 101 public boolean equals( Object obj ) 102 { 103 if ( this == obj ) 104 { 105 return true; 106 } 107 108 if ( obj == null || !getClass().equals( obj.getClass() ) ) 109 { 110 return false; 111 } 112 113 AndDependencyFilter that = (AndDependencyFilter) obj; 114 115 return this.filters.equals( that.filters ); 116 } 117 118 @Override 119 public int hashCode() 120 { 121 int hash = getClass().hashCode(); 122 hash = hash * 31 + filters.hashCode(); 123 return hash; 124 } 125 126}