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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 java.lang.reflect.InvocationTargetException;
30  import java.lang.reflect.Method;
31  
32  import org.apache.http.annotation.Immutable;
33  
34  /**
35   * Uses the java.net.IDN class through reflection.
36   *
37   * @since 4.0
38   */
39  @Immutable
40  public class JdkIdn implements Idn {
41      private final Method toUnicode;
42  
43      /**
44       *
45       * @throws ClassNotFoundException if java.net.IDN is not available
46       */
47      public JdkIdn() throws ClassNotFoundException {
48          final Class<?> clazz = Class.forName("java.net.IDN");
49          try {
50              toUnicode = clazz.getMethod("toUnicode", String.class);
51          } catch (final SecurityException e) {
52              // doesn't happen
53              throw new IllegalStateException(e.getMessage(), e);
54          } catch (final NoSuchMethodException e) {
55              // doesn't happen
56              throw new IllegalStateException(e.getMessage(), e);
57          }
58      }
59  
60      @Override
61      public String toUnicode(final String punycode) {
62          try {
63              return (String) toUnicode.invoke(null, punycode);
64          } catch (final IllegalAccessException e) {
65              throw new IllegalStateException(e.getMessage(), e);
66          } catch (final InvocationTargetException e) {
67              final Throwable t = e.getCause();
68              throw new RuntimeException(t.getMessage(), t);
69          }
70      }
71  
72  }