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 /**
32 * A dependency filter that combines zero or more other filters using a logical {@code AND}. The resulting filter
33 * accepts a given dependency node if and only if all constituent filters accept it.
34 */
35 public final class AndDependencyFilter
36 implements DependencyFilter
37 {
38
39 private final Set<DependencyFilter> filters = new LinkedHashSet<DependencyFilter>();
40
41 /**
42 * Creates a new filter from the specified filters. Prefer {@link #newInstance(DependencyFilter, DependencyFilter)}
43 * if any of the input filters might be {@code null}.
44 *
45 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements.
46 */
47 public AndDependencyFilter( DependencyFilter... filters )
48 {
49 if ( filters != null )
50 {
51 Collections.addAll( this.filters, filters );
52 }
53 }
54
55 /**
56 * Creates a new filter from the specified filters.
57 *
58 * @param filters The filters to combine, may be {@code null} but must not contain {@code null} elements.
59 */
60 public AndDependencyFilter( Collection<DependencyFilter> filters )
61 {
62 if ( filters != null )
63 {
64 this.filters.addAll( filters );
65 }
66 }
67
68 /**
69 * Creates a new filter from the specified filters.
70 *
71 * @param filter1 The first filter to combine, may be {@code null}.
72 * @param filter2 The second filter to combine, may be {@code null}.
73 * @return The combined filter or {@code null} if both filter were {@code null}.
74 */
75 public static DependencyFilter newInstance( DependencyFilter filter1, DependencyFilter filter2 )
76 {
77 if ( filter1 == null )
78 {
79 return filter2;
80 }
81 else if ( filter2 == null )
82 {
83 return filter1;
84 }
85 return new AndDependencyFilter( filter1, filter2 );
86 }
87
88 public boolean accept( DependencyNode node, List<DependencyNode> parents )
89 {
90 for ( DependencyFilter filter : filters )
91 {
92 if ( !filter.accept( node, parents ) )
93 {
94 return false;
95 }
96 }
97 return true;
98 }
99
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 }