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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  
17  package io.netty.resolver;
18  
19  import io.netty.util.concurrent.EventExecutor;
20  import io.netty.util.concurrent.Promise;
21  import io.netty.util.internal.UnstableApi;
22  
23  import java.net.SocketAddress;
24  import java.util.Collections;
25  import java.util.List;
26  
27  /**
28   * A {@link AddressResolver} that does not perform any resolution but always reports successful resolution.
29   * This resolver is useful when name resolution is performed by a handler in a pipeline, such as a proxy handler.
30   */
31  @UnstableApi
32  public class NoopAddressResolver extends AbstractAddressResolver<SocketAddress> {
33  
34      public NoopAddressResolver(EventExecutor executor) {
35          super(executor);
36      }
37  
38      @Override
39      protected boolean doIsResolved(SocketAddress address) {
40          return true;
41      }
42  
43      @Override
44      protected void doResolve(SocketAddress unresolvedAddress, Promise<SocketAddress> promise) throws Exception {
45          promise.setSuccess(unresolvedAddress);
46      }
47  
48      @Override
49      protected void doResolveAll(
50              SocketAddress unresolvedAddress, Promise<List<SocketAddress>> promise) throws Exception {
51          promise.setSuccess(Collections.singletonList(unresolvedAddress));
52      }
53  }