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  * 

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  * and Distribution License("CDDL") (collectively, the "License").  You

  * may not use this file except in compliance with the License. You can obtain

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  * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific

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  * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.

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 package com.sun.grizzly.util;

 import com.sun.grizzly.Controller;

 import java.lang.reflect.Constructor;

 import java.util.logging.Level;

 /**

  * Class Cloner creates a clone of given object, 

  * which should implement interface <code>Copyable</code>

  * 

  * @author Alexey Stashok

  */

 public class Cloner {

     /**

      * Method creates a clone of given object pattern

      * Pattern parameter should implement <class>Copyable</class> interface

      * 

      * @param pattern represents object, which will be cloned. Should implement <code>Copyable</code>

      * @return clone

      */

     public static <T extends Copyable> T clone(T pattern) {

         try {

             T copy = null;

             try {

                 // Try default Constructor

                 copy = (T) pattern.getClass().newInstance();

             } catch(InstantiationException e) {

                 // If didn't succeed with default - try other public constructors

                 Constructor[] constructors = pattern.getClass().getConstructors();

                 if (constructors.length == 0) {

                     // if there are no public constructors - try others

                     constructors = pattern.getClass().getDeclaredConstructors();

                 }

                 for(Constructor constructor : constructors) {

                     constructor.setAccessible(true);

                     Object[] params = 

                             new Object[constructor.getParameterTypes().length];

                     try {

                         copy = (T) constructor.newInstance(params);

                         break;

                     } catch(InstantiationException ee) {

                     }

                 }

             }

             if (copy == null) {

                 throw new InstantiationException("Could not create " +

                         "an instance of class: " + pattern.getClass().getName());

             }

             pattern.copyTo(copy);

             return copy;

         } catch (Exception e) {

             if (Controller.logger().isLoggable(Level.WARNING)) {

                 Controller.logger().log(Level.WARNING, "Error copying objects!", e);

             }

             throw new RuntimeException("Error copying objects! " + e.getClass().getName() + ": " + e.getMessage());

         }

     }

 }