1 package org.eclipse.aether.util.repository;
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 static java.util.Objects.requireNonNull;
23
24 import org.eclipse.aether.repository.Proxy;
25 import org.eclipse.aether.repository.ProxySelector;
26 import org.eclipse.aether.repository.RemoteRepository;
27
28 /**
29 * A proxy selector that delegates to another selector but only if a repository has no proxy yet. If a proxy has already
30 * been assigned to a repository, that is selected.
31 */
32 public final class ConservativeProxySelector
33 implements ProxySelector
34 {
35
36 private final ProxySelector selector;
37
38 /**
39 * Creates a new selector that delegates to the specified selector.
40 *
41 * @param selector The selector to delegate to in case a repository has no proxy yet, must not be {@code null}.
42 */
43 public ConservativeProxySelector( ProxySelector selector )
44 {
45 this.selector = requireNonNull( selector, "proxy selector cannot be null" );
46 }
47
48 public Proxy getProxy( RemoteRepository repository )
49 {
50 requireNonNull( repository, "repository cannot be null" );
51 Proxy proxy = repository.getProxy();
52 if ( proxy != null )
53 {
54 return proxy;
55 }
56 return selector.getProxy( repository );
57 }
58
59 }