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.filter; 020 021import java.util.Collection; 022import java.util.Collections; 023import java.util.LinkedHashSet; 024import java.util.List; 025import java.util.Set; 026 027import org.eclipse.aether.graph.DependencyFilter; 028import org.eclipse.aether.graph.DependencyNode; 029 030import static java.util.Objects.requireNonNull; 031 032/** 033 * A dependency filter that combines zero or more other filters using a logical {@code AND}. The resulting filter 034 * accepts a given dependency node if and only if all constituent filters accept it. 035 */ 036public final class AndDependencyFilter implements DependencyFilter { 037 038 private final Set<DependencyFilter> filters = new LinkedHashSet<>(); 039 040 /** 041 * Creates a new filter from the specified filters. Prefer {@link #newInstance(DependencyFilter, DependencyFilter)} 042 * if any of the input filters might be {@code null}. 043 * 044 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements. 045 */ 046 public AndDependencyFilter(DependencyFilter... filters) { 047 if (filters != null) { 048 Collections.addAll(this.filters, filters); 049 } 050 } 051 052 /** 053 * Creates a new filter from the specified filters. 054 * 055 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements. 056 */ 057 public AndDependencyFilter(Collection<DependencyFilter> filters) { 058 if (filters != null) { 059 this.filters.addAll(filters); 060 } 061 } 062 063 /** 064 * Creates a new filter from the specified filters. 065 * 066 * @param filter1 The first filter to combine, may be {@code null}. 067 * @param filter2 The second filter to combine, may be {@code null}. 068 * @return The combined filter or {@code null} if both filter were {@code null}. 069 */ 070 public static DependencyFilter newInstance(DependencyFilter filter1, DependencyFilter filter2) { 071 if (filter1 == null) { 072 return filter2; 073 } else if (filter2 == null) { 074 return filter1; 075 } 076 return new AndDependencyFilter(filter1, filter2); 077 } 078 079 public boolean accept(DependencyNode node, List<DependencyNode> parents) { 080 requireNonNull(node, "node cannot be null"); 081 requireNonNull(parents, "parents cannot be null"); 082 for (DependencyFilter filter : filters) { 083 if (!filter.accept(node, parents)) { 084 return false; 085 } 086 } 087 return true; 088 } 089 090 @Override 091 public boolean equals(Object obj) { 092 if (this == obj) { 093 return true; 094 } 095 096 if (obj == null || !getClass().equals(obj.getClass())) { 097 return false; 098 } 099 100 AndDependencyFilter that = (AndDependencyFilter) obj; 101 102 return this.filters.equals(that.filters); 103 } 104 105 @Override 106 public int hashCode() { 107 int hash = getClass().hashCode(); 108 hash = hash * 31 + filters.hashCode(); 109 return hash; 110 } 111}