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Date: Wed,  1 Dec 2004 22:34:05 -0200
Message-Id: <I82K8T$A84D35D41FC8115766C949264FADD94C@uol.com.br>
Subject: Re: [Collections] deep cloning
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From: "Rafael U. C. Afonso" <r.u.c.afonso@uol.com.br>
To: "commons-user" <commons-user@jakarta.apache.org>

Hello:

It could be done simply using
InvokerTransformer
(http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/or=
g/apache/commons/collections/functors/InvokerTransformer.html)
and CollectionUtils.collect()
(http://jakarta.apache.org/commons/collections/apidocs-COLLECTIONS_3_1/or=
g/apache/commons/collections/CollectionUtils.html#collect(java.util.Colle=
ction,%20org.apache.commons.collections.Transformer)):

Collection clonedCollection =3D
CollectionUtils.collect(originalCollection,
new
InvokerTransformer.getInstance("clone"));


Thanks,


---------- In=EDcio da mensagem original
-----------

      De: "Edgar Poce"
epoce@fibertel.com.ar
    Para: "Jakarta Commons Users List"
commons-user@jakarta.apache.org
      Cc: 
    Data: Wed, 01 Dec 2004 20:35:36 -0300
 Assunto: Re: [Collections] deep cloning

> But the goal of the Collections
component is to extend the JDK 
> framework, right?.
> I think it would be useful to have a
deepClone utility under 
> CollectionUtils.
> 
> something like
> 
> 	/**
> 	 * Deep clone.
> 	 * It creates a new Collection wich
contains a clone of
> 	 * each element found in the
original Collection.
> 	 * All the elements in the original
Collection must support
> 	 * clone() method invocation. If
not CloneNotSupportedException
> 	 * is thrown
> 	 *
> 	 * @param collection
> 	 * @return
> 	 * @throws CloneNotSupportedException
> 	 */
>      private static Collection
deepClone(Collection collection) throws 
> CloneNotSupportedException {
>          ArrayList retu =3D new
ArrayList();
>          Iterator iter =3D
collection.iterator() ;
>          while (iter.hasNext()) {
>              Object o =3D (Object)
iter.next() ;
>              try {
>                  Method method =3D
o.getClass().getDeclaredMethod("clone", 
> new Class[]{});
>                  Object clone =3D
method.invoke(o, new Object[]{} );
>                  retu.add(clone);
>              } catch (Exception e) {
>                  throw new
CloneNotSupportedException("Unable to
clone 
> element " + o + ". Exception=3D" +
e.getClass().getName() + ". Message=3D " 
> + e.getMessage() );
>              }
>          }
>          return retu ;
>      }	
> 
> ----- Original Message -----
> From: Stephen Colebourne
>  > No, because the JDK collections
API doesn't feature cloning as part 
> of > its
>  > standard  functions.
>  >
>  > You could try commons-lang
SerializationUtils clone. That will do 
> what > you
>  > want, just a little slowly.
>  >
>  > Stephen
>  >
>  > ----- Original Message -----
>  > From: "Edgar Poce"
>  > > hi
>  > >   is there any method in the
package that clones a Collection and
>  > > returns a new Collection wich
contains a clone of each element?.
>  > >
>  > > Thanks in advance
>  > > Edgar
>  > >
>  > >
>---------------------------------------------------------------------
> 
> 
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> 

Rafael Ubiratam Clemente Afonso
r.u.c.afonso@uol.com.br
---------------------------------
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