/** * */ package com.floreantpos.swing; import java.awt.Toolkit; import javax.swing.text.AttributeSet; import javax.swing.text.BadLocationException; import javax.swing.text.PlainDocument; public class FixedLengthDocument extends PlainDocument { /** * */ private int length; /** * @param field */ public FixedLengthDocument(int length) { this.length = length; } @Override public void insertString(int offs, String str, AttributeSet a) throws BadLocationException { int currentLength = super.getLength() + str.length(); if(currentLength > this.length) { Toolkit.getDefaultToolkit().beep(); return; } super.insertString(offs, str, a); } public int getMaximumLength() { return length; } public void setMaximumLength(int length) { this.length = length; } }