1 /* 2 * $HeadURL:$ 3 * $Revision:$ 4 * $Date:$ 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 /** 36 * A collection of utilities to workaround limitations of Java clone framework. 37 */ 38 public class CloneUtils { 39 40 public static Object clone(final Object obj) throws CloneNotSupportedException { 41 if (obj == null) { 42 return null; 43 } 44 if (obj instanceof Cloneable) { 45 Class<?> clazz = obj.getClass (); 46 Method m; 47 try { 48 m = clazz.getMethod("clone", (Class[]) null); 49 } catch (NoSuchMethodException ex) { 50 throw new NoSuchMethodError(ex.getMessage()); 51 } 52 try { 53 return m.invoke(obj, (Object []) null); 54 } catch (InvocationTargetException ex) { 55 Throwable cause = ex.getCause(); 56 if (cause instanceof CloneNotSupportedException) { 57 throw ((CloneNotSupportedException) cause); 58 } else { 59 throw new Error("Unexpected exception", cause); 60 } 61 } catch (IllegalAccessException ex) { 62 throw new IllegalAccessError(ex.getMessage()); 63 } 64 } else { 65 throw new CloneNotSupportedException(); 66 } 67 } 68 69 /** 70 * This class should not be instantiated. 71 */ 72 private CloneUtils() { 73 } 74 75 } 76
