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