source: trunk/gli/src/org/greenstone/gatherer/gui/URLField.java@ 5590

package org.greenstone.gatherer.gui;

import java.awt.*;
import java.util.regex.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.text.*;

public class URLField
    extends JTextField 
    implements DocumentListener {

    static final public Pattern URL_PATTERN = Pattern.compile("h|ht|htt|http|http:|http:/|http://|http://(([a-zA-Z]([a-zA-Z]|[0-9]|[\\$\\-_\\&\\+]|[!\\*\"\'\\(\\)]|(%[0-9A-Fa-f][0-9A-Fa-f]))*(\\.[a-zA-Z]([a-zA-Z]|[0-9]|[\\$\\-_\\&\\+]|[!\\*\"\'\\(\\)]|(%[0-9A-Fa-f][0-9A-Fa-f]))*)*)|(([0-9])+\\.([0-9])+\\.([0-9])+\\.([0-9])+))(:([0-9])+)?(/([a-zA-Z]|[0-9]|[\\$\\-_\\.\\&\\+]|[!\\*\"\'\\(\\),]|(%[0-9A-Fa-f][0-9A-Fa-f]))+)*");

    private Color background;
    private Color foreground;
    private Color invalid_background;
    private Color invalid_foreground;

    public URLField(Color foreground, Color background, Color invalid_foreground, Color invalid_background) {
    super();
    this.background = background;
    this.foreground = foreground;
    this.invalid_background = invalid_background;
    this.invalid_foreground = invalid_foreground;
    setBackground(background);
    setForeground(foreground);
    //getDocument().addDocumentListener(this);
    }

    public URLField(String email, Color foreground, Color background, Color invalid_foreground, Color invalid_background) {
    super(email);
    this.background = background;
    this.foreground = foreground;
    this.invalid_background = invalid_background;
    this.invalid_foreground = invalid_foreground;
    setBackground(background);
    //getDocument().addDocumentListener(this);
    }

    /** Gives notification that an attribute or set of attributes changed.
     * @param e
     */
    public void changedUpdate(DocumentEvent e) {
    validateURL();
    }
          
    /** Gives notification that there was an insert into the document.
     * @param e
     */
    public void insertUpdate(DocumentEvent e) {
    validateURL();
    }
          
    /** Gives notification that a portion of the document has been removed. 
     * @param e
     */
    public void removeUpdate(DocumentEvent e) {
    validateURL();
    }

    public boolean validateURL() {
    boolean result;
    String text = getText();
    Matcher m = URL_PATTERN.matcher(text);
    if(text.length() == 0 || m.matches()) {
        setBackground(background);
        setForeground(foreground);
        result = true;
    }
    else {
        setBackground(invalid_background);
        setForeground(invalid_foreground);
        result = false;
    }
    m = null;
    return result;
    }

    static public void main(String[] args) {
    JFrame frame = new JFrame("URLField test");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(300,60);
    JPanel panel = (JPanel) frame.getContentPane();
    panel.setLayout(new BorderLayout());
    panel.add(new URLField(Color.black, Color.white, Color.white, Color.red), BorderLayout.CENTER);
    frame.show();
    }
}