/*
JPC: An x86 PC Hardware Emulator for a pure Java Virtual Machine
Release Version 2.4
A project from the Physics Dept, The University of Oxford
Copyright (C) 2007-2010 The University of Oxford
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as published by
the Free Software Foundation.
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Details (including contact information) can be found at:
jpc.sourceforge.net
or the developer website
sourceforge.net/projects/jpc/
Conceived and Developed by:
Rhys Newman, Ian Preston, Chris Dennis
End of licence header
*/
package org.jpc.debugger.util;
import javax.swing.JTextField;
import javax.swing.text.*;
public class ValidatingTextField extends JTextField
{
private int lengthLimit;
private String allowedChars;
private char replacementChar;
public ValidatingTextField(String allowedChars, int lengthLimit)
{
this(allowedChars, (char) 0, lengthLimit);
}
public ValidatingTextField(String allowedChars, char replacementChar, int lengthLimit)
{
this.allowedChars = allowedChars;
this.lengthLimit = lengthLimit;
this.replacementChar = replacementChar;
((AbstractDocument) getDocument()).setDocumentFilter(new CharFilter());
}
class CharFilter extends DocumentFilter
{
String validate(String text)
{
StringBuffer buf = new StringBuffer();
for (int i=0; i<text.length(); i++)
if (allowedChars.indexOf(text.charAt(i)) < 0)
{
if (replacementChar > 0)
buf.append(replacementChar);
}
else
buf.append(text.charAt(i));
return buf.toString();
}
public void insertString(DocumentFilter.FilterBypass fb, int offset, String text, AttributeSet attrs) throws BadLocationException
{
if ((lengthLimit >= 0) && (getText().length() >= lengthLimit))
text = "";
text = validate(text);
super.insertString(fb, offset, text, attrs);
}
public void replace(DocumentFilter.FilterBypass fb, int offset, int length, String text, AttributeSet attrs) throws BadLocationException
{
if (lengthLimit >= 0)
{
int max = Math.min(text.length(), lengthLimit - getText().length() + length);
text = text.substring(0, max);
}
text = validate(text);
super.replace(fb, offset, length, text, attrs);
}
}
}