okhttp-tests/src/test/java/com/squareup/okhttp/internal/SingleInetAddressDns.java

/*
 * Copyright (C) 2014 Square, Inc.
 *
 * Licensed 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
 *
 *      http://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 com.squareup.okhttp.internal;

import com.squareup.okhttp.Dns;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Collections;
import java.util.List;

/**
 * A network that resolves only one IP address per host. Use this when testing
 * route selection fallbacks to prevent the host machine's various IP addresses
 * from interfering.
 */
public class SingleInetAddressDns implements Dns {
  @Override public List<InetAddress> lookup(String hostname) throws UnknownHostException {
    List<InetAddress> addresses = Dns.SYSTEM.lookup(hostname);
    return Collections.singletonList(addresses.get(0));
  }
}