1 /*
2 * $HeadURL$
3 * $Revision: 1470921 $
4 * $Date: 2013-04-23 12:42:29 +0000 (Tue, 23 Apr 2013) $
5 *
6 * ====================================================================
7 *
8 * Licensed to the Apache Software Foundation (ASF) under one or more
9 * contributor license agreements. See the NOTICE file distributed with
10 * this work for additional information regarding copyright ownership.
11 * The ASF licenses this file to You under the Apache License, Version 2.0
12 * (the "License"); you may not use this file except in compliance with
13 * the License. You may obtain a copy of the License at
14 *
15 * http://www.apache.org/licenses/LICENSE-2.0
16 *
17 * Unless required by applicable law or agreed to in writing, software
18 * distributed under the License is distributed on an "AS IS" BASIS,
19 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20 * See the License for the specific language governing permissions and
21 * limitations under the License.
22 * ====================================================================
23 *
24 * This software consists of voluntary contributions made by many
25 * individuals on behalf of the Apache Software Foundation. For more
26 * information on the Apache Software Foundation, please see
27 * <http://www.apache.org/>.
28 *
29 */
30 package org.apache.http.client.utils;
31
32 import java.lang.reflect.InvocationTargetException;
33 import java.lang.reflect.Method;
34
35 import org.apache.http.annotation.Immutable;
36
37 /**
38 * A collection of utilities to workaround limitations of Java clone framework.
39 *
40 * @since 4.0
41 */
42 @Immutable
43 public class CloneUtils {
44
45 public static Object clone(final Object obj) throws CloneNotSupportedException {
46 if (obj == null) {
47 return null;
48 }
49 if (obj instanceof Cloneable) {
50 Class<?> clazz = obj.getClass ();
51 Method m;
52 try {
53 m = clazz.getMethod("clone", (Class[]) null);
54 } catch (NoSuchMethodException ex) {
55 throw new NoSuchMethodError(ex.getMessage());
56 }
57 try {
58 return m.invoke(obj, (Object []) null);
59 } catch (InvocationTargetException ex) {
60 Throwable cause = ex.getCause();
61 if (cause instanceof CloneNotSupportedException) {
62 throw ((CloneNotSupportedException) cause);
63 } else {
64 throw new Error("Unexpected exception", cause);
65 }
66 } catch (IllegalAccessException ex) {
67 throw new IllegalAccessError(ex.getMessage());
68 }
69 } else {
70 throw new CloneNotSupportedException();
71 }
72 }
73
74 /**
75 * This class should not be instantiated.
76 */
77 private CloneUtils() {
78 }
79
80 }