/*

 * $HeadURL$

 * $Revision$

 * $Date$

 *

 * ====================================================================

 *

 *  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

 * <http://www.apache.org/>.

 *

 */

package org.apache.http.client.utils;



import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;



import org.apache.http.annotation.Immutable;



/**

 * A collection of utilities to workaround limitations of Java clone framework.

 *

 * @since 4.0

 */

@Immutable

public class CloneUtils {



    public static Object clone(final Object obj) throws CloneNotSupportedException {

        if (obj == null) {

            return null;

        }

        if (obj instanceof Cloneable) {

            Class<?> clazz = obj.getClass ();

            Method m;

            try {

                m = clazz.getMethod("clone", (Class[]) null);

            } catch (NoSuchMethodException ex) {

                throw new NoSuchMethodError(ex.getMessage());

            }

            try {

                return m.invoke(obj, (Object []) null);

            } catch (InvocationTargetException ex) {

                Throwable cause = ex.getCause();

                if (cause instanceof CloneNotSupportedException) {

                    throw ((CloneNotSupportedException) cause);

                } else {

                    throw new Error("Unexpected exception", cause);

                }

            } catch (IllegalAccessException ex) {

                throw new IllegalAccessError(ex.getMessage());

            }

        } else {

            throw new CloneNotSupportedException();

        }

    }



    /**

     * This class should not be instantiated.

     */

    private CloneUtils() {

    }



}