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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  package org.apache.http.client.utils;
28  
29  import org.apache.http.annotation.Immutable;
30  
31  /**
32   * Facade that provides conversion between Unicode and Punycode domain names.
33   * It will use an appropriate implementation.
34   *
35   * @since 4.0
36   */
37  @Immutable
38  public class Punycode {
39      private static final Idn impl;
40      static {
41          Idn _impl;
42          try {
43              _impl = new JdkIdn();
44          } catch (final Exception e) {
45              _impl = new Rfc3492Idn();
46          }
47          impl = _impl;
48      }
49  
50      public static String toUnicode(final String punycode) {
51          return impl.toUnicode(punycode);
52      }
53  
54  }