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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    *   https://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 java.net.Inet4Address;
19  import java.net.Inet6Address;
20  import java.util.Collections;
21  import java.util.HashMap;
22  import java.util.Map;
23  
24  /**
25   * A container of hosts file entries.
26   * The mappings contain only the first entry per hostname.
27   * Consider using {@link HostsFileEntriesProvider} when mappings with all entries per hostname are needed.
28   */
29  public final class HostsFileEntries {
30  
31      /**
32       * Empty entries
33       */
34      static final HostsFileEntries EMPTY =
35              new HostsFileEntries(
36                      Collections.<String, Inet4Address>emptyMap(),
37                      Collections.<String, Inet6Address>emptyMap());
38  
39      private final Map<String, Inet4Address> inet4Entries;
40      private final Map<String, Inet6Address> inet6Entries;
41  
42      public HostsFileEntries(Map<String, Inet4Address> inet4Entries, Map<String, Inet6Address> inet6Entries) {
43          this.inet4Entries = Collections.unmodifiableMap(new HashMap<String, Inet4Address>(inet4Entries));
44          this.inet6Entries = Collections.unmodifiableMap(new HashMap<String, Inet6Address>(inet6Entries));
45      }
46  
47      /**
48       * The IPv4 entries
49       * @return the IPv4 entries
50       */
51      public Map<String, Inet4Address> inet4Entries() {
52          return inet4Entries;
53      }
54  
55      /**
56       * The IPv6 entries
57       * @return the IPv6 entries
58       */
59      public Map<String, Inet6Address> inet6Entries() {
60          return inet6Entries;
61      }
62  }