com.sun.grizzly.util.Cloner Maven / Gradle / Ivy
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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 Copyable
*
* @author Alexey Stashok
*/
public class Cloner {
/**
* Method creates a clone of given object pattern
* Pattern parameter should implement Copyable interface
*
* @param pattern represents object, which will be cloned. Should implement Copyable
* @return clone
*/
public static 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());
}
}
}