We already have SerializationUtils.clone() to help with cloning.
I can't see how a CloneBuilder would help. Each clone is a very class
specific function, and typically needs to be written directly within the
class itself.
There just might be a role for a public clone interface, although it
really needs to be in the JDK to be of any use.
Stephen
Gregor Zeitlinger wrote:
1)
Since Cloneable is broken in Java, I think it would be a good idea to
introduce a better solution. The simplest solution would be
public interface Copyable extends Cloneable {
public Object clone();
}
This would get rid of the problem that the clone method is not part of
the Cloneable interface.
I doesn't solve the problem that it would be nice to require that the
cloned object is exactly the same type:
public this clone();
but this isn't possible in Java.
2)
I would welcome a utility class that assists in implementing clone:
CloneBuilder
I don't really know the best way to do this, but it is important to
keep inheritance in mind.
public interface Copyable extends Cloneable {
public Object clone();
public Object clone(Object result);
}
public class A implements Copyable {
..
}
public class B extends A {
int value;
public Object clone() {
return clone(new B());
}
public Object clone(Object result) {
super.clone(result);
B other = (B) result;
other.value = value;
}
}
The CloneBuilder would preferably make this simpler.
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