limitedstyleddocument.java

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

/*                                                                      tab:4
 *
 *
 * "Copyright (c) 2000-2002 The Regents of the University  of California.  
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the author appear in all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Authors:  Philip Levis  <[e-mail]>
 *
 */


/**
 * LimitedStyleDocument is used with a JTextPane to constrain the width of the
 * text.
 */

package net.tinyos.util;


import java.awt.*;
import javax.swing.*;
import javax.swing.text.*;

public class LimitedStyledDocument extends DefaultStyledDocument {
    private int size;
    
    public LimitedStyledDocument(int size) {
	this.size = size;
    }
    
    public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
	if ((getLength() + str.length()) <= size) {
	    super.insertString(offs, str, a);
	}
	else {
	    System.err.println("Tried to make field " + (getLength() + str.length()) + " characters long when max length is " + size);
	    Toolkit.getDefaultToolkit().beep();
	}
    }
}