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Jakarta Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

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/*
 * Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.faces.util.copier;

import static java.lang.String.format;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Copier that copies an object using the {@link Cloneable} facility.
 *
 * @since 2.3
 * @author Arjan Tijms
 *
 */
public class CloneCopier implements Copier {

    private static final String ERROR_CANT_CLONE = "Can not clone object of type %s since it doesn't implement Cloneable";

    @Override
    public Object copy(Object object) {

        if (!(object instanceof Cloneable)) {
            throw new IllegalStateException(format(ERROR_CANT_CLONE, object.getClass()));
        }

        try {

            Method cloneMethod = getMethod(object, "clone");

            if (!cloneMethod.isAccessible()) {
                cloneMethod.setAccessible(true);
            }

            return cloneMethod.invoke(object);

        } catch (SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
            throw new IllegalStateException(e);
        }
    }

    private Method getMethod(Object object, String name) {
        for (Class c = object.getClass(); c != null; c = c.getSuperclass()) {
            for (Method method : c.getDeclaredMethods()) {
                if (method.getName().equals(name)) {
                    return method;
                }
            }
        }

        return null;
    }

}