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 }