import javax.swing.text.AttributeSet;

import javax.swing.text.BadLocationException;

import javax.swing.text.DocumentFilter;

import javax.swing.text.DocumentFilter.FilterBypass;

/**

* The UpperCaseDocumentFilter converts all characters to upper case before

* the characters are inserted into the Document.

*/

public class UpperCaseDocumentFilter extends ChainedDocumentFilter

{

/**

* Standard constructor for stand alone usage

*/

public UpperCaseDocumentFilter()

{

}

/**

* Constructor used when further filtering is required after this

* filter has been applied.

*/

public UpperCaseDocumentFilter(DocumentFilter filter)

{

super(filter);

}

public void insertString(FilterBypass fb, int offs, String str, AttributeSet a)

throws BadLocationException

{

replace(fb, offs, 0, str, a);

}

public void replace(FilterBypass fb, final int offs, final int length, final String text, final AttributeSet a)

throws BadLocationException

{

if (text != null)

{

super.replace(fb, offs, length, text.toUpperCase(), a);

}

}

}