1 package org.eclipse.aether.util.filter;
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.Collection;
23 import java.util.Collections;
24 import java.util.LinkedHashSet;
25 import java.util.List;
26 import java.util.Set;
27
28 import org.eclipse.aether.graph.DependencyFilter;
29 import org.eclipse.aether.graph.DependencyNode;
30
31 import static java.util.Objects.requireNonNull;
32
33 /**
34 * A dependency filter that combines zero or more other filters using a logical {@code AND}. The resulting filter
35 * accepts a given dependency node if and only if all constituent filters accept it.
36 */
37 public final class AndDependencyFilter
38 implements DependencyFilter
39 {
40
41 private final Set<DependencyFilter> filters = new LinkedHashSet<>();
42
43 /**
44 * Creates a new filter from the specified filters. Prefer {@link #newInstance(DependencyFilter, DependencyFilter)}
45 * if any of the input filters might be {@code null}.
46 *
47 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements.
48 */
49 public AndDependencyFilter( DependencyFilter... filters )
50 {
51 if ( filters != null )
52 {
53 Collections.addAll( this.filters, filters );
54 }
55 }
56
57 /**
58 * Creates a new filter from the specified filters.
59 *
60 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements.
61 */
62 public AndDependencyFilter( Collection<DependencyFilter> filters )
63 {
64 if ( filters != null )
65 {
66 this.filters.addAll( filters );
67 }
68 }
69
70 /**
71 * Creates a new filter from the specified filters.
72 *
73 * @param filter1 The first filter to combine, may be {@code null}.
74 * @param filter2 The second filter to combine, may be {@code null}.
75 * @return The combined filter or {@code null} if both filter were {@code null}.
76 */
77 public static DependencyFilter newInstance( DependencyFilter filter1, DependencyFilter filter2 )
78 {
79 if ( filter1 == null )
80 {
81 return filter2;
82 }
83 else if ( filter2 == null )
84 {
85 return filter1;
86 }
87 return new AndDependencyFilter( filter1, filter2 );
88 }
89
90 public boolean accept( DependencyNode node, List<DependencyNode> parents )
91 {
92 requireNonNull( node, "node cannot be null" );
93 requireNonNull( parents, "parents cannot be null" );
94 for ( DependencyFilter filter : filters )
95 {
96 if ( !filter.accept( node, parents ) )
97 {
98 return false;
99 }
100 }
101 return true;
102 }
103
104 @Override
105 public boolean equals( Object obj )
106 {
107 if ( this == obj )
108 {
109 return true;
110 }
111
112 if ( obj == null || !getClass().equals( obj.getClass() ) )
113 {
114 return false;
115 }
116
117 AndDependencyFilter that = (AndDependencyFilter) obj;
118
119 return this.filters.equals( that.filters );
120 }
121
122 @Override
123 public int hashCode()
124 {
125 int hash = getClass().hashCode();
126 hash = hash * 31 + filters.hashCode();
127 return hash;
128 }
129
130 }