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87 lines
3.0 KiB
87 lines
3.0 KiB
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package org.apache.http.client.utils;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import org.apache.http.annotation.Immutable;
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/**
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* A collection of utilities to workaround limitations of Java clone framework.
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*
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* @since 4.0
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*/
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@Immutable
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public class CloneUtilsHC4 {
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/**
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* @since 4.3
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*/
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public static <T> T cloneObject(final T obj) throws CloneNotSupportedException {
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if (obj == null) {
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return null;
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}
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if (obj instanceof Cloneable) {
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final Class<?> clazz = obj.getClass ();
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final Method m;
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try {
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m = clazz.getMethod("clone", (Class[]) null);
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} catch (final NoSuchMethodException ex) {
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throw new NoSuchMethodError(ex.getMessage());
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}
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try {
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@SuppressWarnings("unchecked") // OK because clone() preserves the class
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final T result = (T) m.invoke(obj, (Object []) null);
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return result;
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} catch (final InvocationTargetException ex) {
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final Throwable cause = ex.getCause();
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if (cause instanceof CloneNotSupportedException) {
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throw ((CloneNotSupportedException) cause);
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} else {
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throw new Error("Unexpected exception", cause);
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}
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} catch (final IllegalAccessException ex) {
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throw new IllegalAccessError(ex.getMessage());
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}
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} else {
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throw new CloneNotSupportedException();
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}
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}
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public static Object clone(final Object obj) throws CloneNotSupportedException {
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return cloneObject(obj);
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}
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/**
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* This class should not be instantiated.
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*/
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private CloneUtilsHC4() {
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}
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}
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