Declarative Component : UploadedFile Isssue for multiple file Upload case.

Question

Hi,
I have made one declarative component for the multiple file upload case; where i have add button that dynamically adds af:inputFile component to the popup dialog and similarly delete button to dynamically delete the selected inputFile component. Everything work fine such as:
1. add button adds the inputfile component properly and delete does the same.
2. upload of Multiple files also works fine. ( I keep the uploadedFile in the java.util.Map which is the pageFlowScope and once, Dialog box ok/cancel is clicked, i clear everything back).
IT WORKS GREAT WHEN:
User hit 5 times add button if they want to upload 5 images. and do upload for all the 5 inputFile components . (Add or Delete button should not be clicked after any upload , but before you can.)..
THE ONLY PROBLEM IS WHEN:
1. user uploaded; say 2 images but not yet clicked in the ok/cancel button yet... they are still in the upload dialog ..and hit ADD button again.
2. After that user uploads say another file/image and now UploadedFile's getInputStream() returns null, length becomes 0 for all the other uploadedFile except this newly uploaded file.
Now, here is the thing, i wrote my own customUplodedFile class which is just a wrapper and it return getInputStream() from this class and length from this class and it is working.... But i am not sure why does the uploadedFile loses it's value...
import org.apache.myfaces.trinidad.model.UploadedFile;
public interface ICustomUploadedFile
  extends Serializable, UploadedFile
  public String getFilename();
  public String getContentType();
  public long getLength();
  public Object getOpaqueData();
  public InputStream getInputStream();
  public void dispose();
====================
public class CustomUploadedFile
  implements ICustomUploadedFile, Serializable
  private transient UploadedFile mUploadedFile;
  private transient InputStream mInputStream;
  private long mLength;
  public CustomUploadedFile()
  public CustomUploadedFile(UploadedFile pUploadedFile)
    this.mUploadedFile = pUploadedFile;
    this.mLength = pUploadedFile.getLength();
    try
      this.mInputStream = pUploadedFile.getInputStream();
    catch (IOException e)
      e.printStackTrace();
  public String getFilename()
    return mUploadedFile.getFilename();
  public String getContentType()
    return mUploadedFile.getContentType();
  public long getLength()
    return mLength;
  public Object getOpaqueData()
    return mUploadedFile.getOpaqueData();
  public InputStream getInputStream()
    return mInputStream;
  public void dispose()
    mUploadedFile.dispose();
} Now, my questions are:
1. Is there a way i could follow to not to lose the UploadedFiles's inputStream and length by not using my wrapper class but in a standard way/best way.
2. I am not happy although it works because it is not making sense to me at all.....Why does the wrapper working though when i have transient variables; like UploadedFiles... and it's transient variables are lost why not mine.
I am totally confused at this stage.. Need your help.
Thanks

Answer 1

any one??