Re: Tranformer collection processor

[Jos� Antonio P�rez Testa]

As Kishore said
org.apache.commons.collections.CollectionUtils
can do what you need. You must use 
#CollectionUtils.collect(Collection collection, Transformer transformer)#

See below ...
Rafael U. C. Afonso wrote:
Hello again:
I Read CollectionTranfomer API. It
says: "The add methods are affected by
this class.". Reading the source code
I could see that only added elements
are transformed. But If I have a
Collection (List, Set, Bag, etc) that
has elements before? I want that ALL
it elements be transfomed, not only
when I add something. For example I
create this program test that uses
ListTranformer:
import org.apache.commons.collections.*;
import java.util.*;
public class TestaListTransformer {
	static Object[] vector = {"a", "b", "c"};
	
	private static class UpperTransformer
implements Transformer {
		public Object transform(Object input) {
			return input.toString().toUpperCase();
		}
	}
	
	public static void main(String args[]) {
		List list1 = Arrays.asList(vector);
		System.out.println("Original List: "
+ list1);
		
		List list2 =
// ListUtils.transformedList(list1, new UpperTransformer());
 

CollectionUtils.collect(list1,new UpperTransformer());
                System.out.println("New List: " +
list2);
                
                System.out.print("Iteracting over
New List: ");
                for(Iterator it = list2.iterator();
it.hasNext(); ) {
                
System.out.print(it.next().toString()
+ ", ");
                }
        }
        
}
My results were:
Original List: [a, b, c]
New List: [a, b, c]
Iteracting over New List: a, b, c, 

What I wanted is when I do a
toString() or iterator() over newList
I got all its elements tranformed. Im
this case to get [A, B, C]. So I
maintain again my proposal to create a
method that returns a Collection
(List, Set, Bag, etc) with all
elements transformed.
Thanks,
Rafael Ubiratam Clemente Afonso
[EMAIL PROTECTED]
---------------------------------
Where is Debug?
Debug is on the Table!
---------- In�cio da mensagem original
-----------
     De: "Kishore Senji" [EMAIL PROTECTED]
   Para: "Jakarta Commons Users List"
[EMAIL PROTECTED]
     Cc: 
   Data: Tue, 3 Aug 2004 22:23:20 -0400
Assunto: Re: Tranformer collection
processor

 

CollectionUtils.transform(Collection
   

collection, Transformer
 

transformer); does what you have
   

proposed
 

On Tue,  3 Aug 2004 23:09:30 -0300,
   

Rafael U. C. Afonso
 

<[EMAIL PROTECTED]> wrote:
   

Hello:
Is there something in Collections
     

that, given a collection
 

and a Transformer, return a
     

collection of transformed
 

Objects?
It would be like this:
class TransformeProcessorCollection {
  private Transformer transformer;
  public
     

TransformeProcessorCollection(Transformer
trans) {
 

      transformer = trans;
  }
  public Collection
     

process(Colletcion col) {
 

      Collection newCol = new
     

ArrayList(col.size); // Or
 

some other type of Collection
      Iterator it = new
     

TransformIterator(col.iterator(),
 

transformer);
      while(it.hasNext()) {
          newCol.add(it.next());
      }
      return newCol;
  }
}
If it does not exist, I would like
     

suggest it for Commons
 

Collections. Something similar
     

would be done with Closures
 

and Predicates.
Thanks,
Rafael Ubiratam Clemente Afonso
[EMAIL PROTECTED]
---------------------------------
Where is Debug?
Debug is on the Table!
     

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