1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.eclipse.aether.util.repository;
20
21 import org.eclipse.aether.repository.Authentication;
22 import org.eclipse.aether.repository.AuthenticationSelector;
23 import org.eclipse.aether.repository.RemoteRepository;
24
25 import static java.util.Objects.requireNonNull;
26
27 /**
28 * An authentication selector that delegates to another selector but only if a repository has no authentication data
29 * yet. If authentication has already been assigned to a repository, that is selected.
30 */
31 public final class ConservativeAuthenticationSelector implements AuthenticationSelector {
32
33 private final AuthenticationSelector selector;
34
35 /**
36 * Creates a new selector that delegates to the specified selector.
37 *
38 * @param selector The selector to delegate to in case a repository has no authentication yet, must not be
39 * {@code null}.
40 */
41 public ConservativeAuthenticationSelector(AuthenticationSelector selector) {
42 this.selector = requireNonNull(selector, "authentication selector cannot be null");
43 }
44
45 public Authentication getAuthentication(RemoteRepository repository) {
46 requireNonNull(repository, "repository cannot be null");
47 Authentication auth = repository.getAuthentication();
48 if (auth != null) {
49 return auth;
50 }
51 return selector.getAuthentication(repository);
52 }
53 }