Setting up Swing worker

I'm trying to set up a swing worker that does some file processing in the background while updating progress to a JtextArea.



From class X I call swingworker FileProcessor

Code:

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{
JTextArea outerTextArea;
File selectedFile

FileProcessor task = new FileProcessor(selectedFile, outerTextArea);
selectedFileHolder = task.execute();
}

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Fileprocessor Internals

Code:

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class FileProcessor extends
        SwingWorker<File, JTextArea> {
       
   
   
    FileProcessor(File INPUT, JTextArea innerTextArea) {
        //initialize
    }


@Override
public File doInBackground() {
          File convertedFile = new File("convertedFile.txt");
        int counter=0;
       
        IoUtil.assertFileIsReadable(INPUT);

   
    final GenericFileReader reader = new GenericFileReader(INPUT);

while(somecondition==condition)
{
//processing stuff
counter++;
}

return convertedFile;

  }
}

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A few questions

It keeps telling me INPUT isn't recognized in the FileProcessor class.

How do I get convertedFile in FileProcessor to be selectedFileHolder in Class X?

How would I get counter in FileProcessor to constantly update to outerTextArea in class X?

Quote:

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It keeps telling me INPUT isn't recognized in the FileProcessor class.

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Please use Java naming conventions ie don't use all upper case letters for variable names unless they are constants.

The problem is INPUT is a parameter in the doInBackground classes constructor and not a instance variable and so it is not visible in the doInBackground() method. In the constructor assign INPUT to an instance variable and use that to refer to the file.

Quote:

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How would I get counter in FileProcessor to constantly update to outerTextArea in class X?

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You provide an implementation of the process(..) method to update the text area and call publish(..) from the doInBackground() to pass the data to display to the process() method.