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1   /*
2    * Copyright 2017 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  package io.netty.resolver;
17  
18  import io.netty.util.internal.UnstableApi;
19  
20  import java.net.Inet4Address;
21  import java.net.Inet6Address;
22  import java.util.Collections;
23  import java.util.HashMap;
24  import java.util.Map;
25  
26  /**
27   * A container of hosts file entries
28   */
29  @UnstableApi
30  public final class HostsFileEntries {
31  
32      /**
33       * Empty entries
34       */
35      static final HostsFileEntries EMPTY =
36              new HostsFileEntries(
37                      Collections.<String, Inet4Address>emptyMap(),
38                      Collections.<String, Inet6Address>emptyMap());
39  
40      private final Map<String, Inet4Address> inet4Entries;
41      private final Map<String, Inet6Address> inet6Entries;
42  
43      public HostsFileEntries(Map<String, Inet4Address> inet4Entries, Map<String, Inet6Address> inet6Entries) {
44          this.inet4Entries = Collections.unmodifiableMap(new HashMap<String, Inet4Address>(inet4Entries));
45          this.inet6Entries = Collections.unmodifiableMap(new HashMap<String, Inet6Address>(inet6Entries));
46      }
47  
48      /**
49       * The IPv4 entries
50       * @return the IPv4 entries
51       */
52      public Map<String, Inet4Address> inet4Entries() {
53          return inet4Entries;
54      }
55  
56      /**
57       * The IPv6 entries
58       * @return the IPv6 entries
59       */
60      public Map<String, Inet6Address> inet6Entries() {
61          return inet6Entries;
62      }
63  }