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TFixedSizeDocumentFilter.java

/*
*  Name:      TFixedSizeDocumentFilter.java
*  Author:    Rafael Jesus Alcantara Perez
*  Summary:   Filter for fixed size documents
*  Date:      $Date: 2003/09/09 23:24:56 $
*  Revision:  $Revision: 1.2 $
*
*  Copyright (C) 2003  Rafael Jesus Alcantara Perez <rafa@dedalo-ing.com>
*
*  This program is free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  This program is distributed in the hope that it will be useful,
*  but WITHOUT ANY WARRANTY; without even the implied warranty of
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*  GNU General Public License for more details.
*
*  You should have received a copy of the GNU General Public License
*  along with this program; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
*  MA 02111-1307, USA.
*/

package org.mpcl.nui;

import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;


public class TFixedSizeDocumentFilter extends DocumentFilter
{

  private int   iMaxSize;


  //
  //  C O N S T R U C T O R S
  //

  public TFixedSizeDocumentFilter (int iMAX_SIZE)
  {
    iMaxSize = iMAX_SIZE;
  }

  public void insertString ( DocumentFilter.FilterBypass tFILTER_BYPASS ,
                             int                         iOFFSET        ,
                             String                      yTEXT          ,
                             AttributeSet                tATTRIBUTE_SET )
    throws BadLocationException
  {
    replace (tFILTER_BYPASS, iOFFSET, 0, yTEXT, tATTRIBUTE_SET);
  }
    
  public void replace ( DocumentFilter.FilterBypass tFILTER_BYPASS ,
                        int                         iOFFSET        ,
                        int                         iLENGTH        ,
                        String                      yTEXT          ,
                        AttributeSet                tATTRIBUTE_SET )
    throws BadLocationException
  {
    int   iNewLength;

    iNewLength = tFILTER_BYPASS.getDocument().getLength() - iLENGTH + yTEXT.length();
    if ( iNewLength <= iMaxSize)
    {
      tFILTER_BYPASS.replace (iOFFSET, iLENGTH, yTEXT, tATTRIBUTE_SET);
    }
    else
    {
      throw new BadLocationException ("new characters exceeds max size of document", iOFFSET);
    }
  }

}  // class TFixedSizeDocumentFilter

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