001package org.eclipse.aether.util.repository; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import static java.util.Objects.requireNonNull; 023 024import org.eclipse.aether.repository.Authentication; 025import org.eclipse.aether.repository.AuthenticationSelector; 026import org.eclipse.aether.repository.RemoteRepository; 027 028/** 029 * An authentication selector that delegates to another selector but only if a repository has no authentication data 030 * yet. If authentication has already been assigned to a repository, that is selected. 031 */ 032public final class ConservativeAuthenticationSelector 033 implements AuthenticationSelector 034{ 035 036 private final AuthenticationSelector selector; 037 038 /** 039 * Creates a new selector that delegates to the specified selector. 040 * 041 * @param selector The selector to delegate to in case a repository has no authentication yet, must not be 042 * {@code null}. 043 */ 044 public ConservativeAuthenticationSelector( AuthenticationSelector selector ) 045 { 046 this.selector = requireNonNull( selector, "authentication selector cannot be null" ); 047 } 048 049 public Authentication getAuthentication( RemoteRepository repository ) 050 { 051 Authentication auth = repository.getAuthentication(); 052 if ( auth != null ) 053 { 054 return auth; 055 } 056 return selector.getAuthentication( repository ); 057 } 058 059}