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   /*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  
  package io.netty.resolver;
  
  import io.netty.util.concurrent.EventExecutor;
  import io.netty.util.concurrent.Promise;
  
  import java.net.SocketAddress;
  import java.util.Collections;
  import java.util.List;
  
  /**
   * A {@link AddressResolver} that does not perform any resolution but always reports successful resolution.
   * This resolver is useful when name resolution is performed by a handler in a pipeline, such as a proxy handler.
   */
  public class NoopAddressResolver extends AbstractAddressResolver<SocketAddress> {
  
      public NoopAddressResolver(EventExecutor executor) {
          super(executor);
      }
  
      @Override
      protected boolean doIsResolved(SocketAddress address) {
          return true;
      }
  
      @Override
      protected void doResolve(SocketAddress unresolvedAddress, Promise<SocketAddress> promise) throws Exception {
          promise.setSuccess(unresolvedAddress);
      }
  
      @Override
      protected void doResolveAll(
              SocketAddress unresolvedAddress, Promise<List<SocketAddress>> promise) throws Exception {
          promise.setSuccess(Collections.singletonList(unresolvedAddress));
      }
  }