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package sample.duplicate;
import javassist.reflect.*;
public class DuplicatedObject extends Metaobject {
private DuplicatedObject backup;
// if a base-level object is created, this metaobject creates
// a copy of the base-level object.
public DuplicatedObject(Object self, Object[] args) {
super(self, args);
ClassMetaobject clazz = getClassMetaobject();
if (clazz.isInstance(args[0]))
backup = null; // self is a backup object.
else {
Object[] args2 = new Object[1];
args2[0] = self;
try {
Metalevel m = (Metalevel)clazz.newInstance(args2);
backup = (DuplicatedObject)m._getMetaobject();
}
catch (CannotCreateException e) {
backup = null;
}
}
}
public Object trapMethodcall(int identifier, Object[] args)
throws Throwable
{
Object obj = super.trapMethodcall(identifier, args);
if (backup != null)
backup.trapMethodcall(identifier, args);
return obj;
}
}
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