1 /*
2  * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/ExceptionUtils.java $
3  * $Revision: 613003 $
4  * $Date: 2008-01-17 15:00:42 -0800 (Thu, 17 Jan 2008) $
5  *
6  * ====================================================================
7  * Licensed to the Apache Software Foundation (ASF) under one
8  * or more contributor license agreements.  See the NOTICE file
9  * distributed with this work for additional information
10  * regarding copyright ownership.  The ASF licenses this file
11  * to you under the Apache License, Version 2.0 (the
12  * "License"); you may not use this file except in compliance
13  * with 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,
18  * software distributed under the License is distributed on an
19  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
20  * KIND, either express or implied.  See the License for the
21  * specific language governing permissions and limitations
22  * under the License.
23  * ====================================================================
24  *
25  * This software consists of voluntary contributions made by many
26  * individuals on behalf of the Apache Software Foundation.  For more
27  * information on the Apache Software Foundation, please see
28  * <http://www.apache.org/>.
29  *
30  */
31 package org.apache.http.util;
32 
33 import java.lang.reflect.Method;
34 
35 /**
36  * The home for utility methods that handle various exception-related tasks.
37  *
38  * @author <a href="mailto:oleg at ural.ru">Oleg Kalnichevski</a>
39  * @author <a href="mailto:laura@lwerner.org">Laura Werner</a>
40  *
41  * @since 4.0
42  *
43  * @deprecated Please use {@link java.net.URL#openConnection} instead.
44  *     Please visit <a href="http://android-developers.blogspot.com/2011/09/androids-http-clients.html">this webpage</a>
45  *     for further details.
46  */
47 @Deprecated
48 public final class ExceptionUtils {
49 
50     /** A reference to Throwable's initCause method, or null if it's not there in this JVM */
51     static private final Method INIT_CAUSE_METHOD = getInitCauseMethod();
52 
53     /**
54      * Returns a <code>Method<code> allowing access to
55      * {@link Throwable#initCause(Throwable) initCause} method of {@link Throwable},
56      * or <code>null</code> if the method
57      * does not exist.
58      *
59      * @return A <code>Method<code> for <code>Throwable.initCause</code>, or
60      * <code>null</code> if unavailable.
61      */
getInitCauseMethod()62     static private Method getInitCauseMethod() {
63         try {
64             Class[] paramsClasses = new Class[] { Throwable.class };
65             return Throwable.class.getMethod("initCause", paramsClasses);
66         } catch (NoSuchMethodException e) {
67             return null;
68         }
69     }
70 
71     /**
72      * If we're running on JDK 1.4 or later, initialize the cause for the given throwable.
73      *
74      * @param  throwable The throwable.
75      * @param  cause     The cause of the throwable.
76      */
initCause(Throwable throwable, Throwable cause)77     public static void initCause(Throwable throwable, Throwable cause) {
78         if (INIT_CAUSE_METHOD != null) {
79             try {
80                 INIT_CAUSE_METHOD.invoke(throwable, new Object[] { cause });
81             } catch (Exception e) {
82                 // Well, with no logging, the only option is to munch the exception
83             }
84         }
85     }
86 
ExceptionUtils()87     private ExceptionUtils() {
88     }
89 
90 }
91