/*
 *  RapidMiner
 *
 *  Copyright (C) 2001-2011 by Rapid-I and the contributors
 *
 *  Complete list of developers available at our web site:
 *
 *       http://rapid-i.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see http://www.gnu.org/licenses/.
 */
package com.rapidminer.gui.tools;

import java.awt.Color;

import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.SimpleAttributeSet;
import javax.swing.text.StyleConstants;
import javax.swing.text.StyleContext;

/**
 * This is a JTextPane that will assign each word a color specified by the getColor method.
 * 
 * @author Sebastian Land
 * 
 */
public abstract class ColoredJTextPane extends JTextPane {
	private static final long serialVersionUID = 1L;

	public ColoredJTextPane() {
		super();
		setDocument(new DefaultStyledDocument() {
			private static final long serialVersionUID = 1L;

			@Override
			public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
				super.insertString(offs, str, a);

				// now color all texts again
				// do coloring of words but ignore keys unless it is word termination
				String text = getText(0, getLength());
				char[] chars = text.toCharArray();
				StyleContext context = StyleContext.getDefaultStyleContext();
				int lastStart = 0;
				boolean charactersSinceLastStart = false;
				for (int i = 0; i < text.length(); i++) {
					if (!Character.isLetter(chars[i])) {
						if (charactersSinceLastStart) {
							AttributeSet attributeSet = context.addAttribute(SimpleAttributeSet.EMPTY, StyleConstants.Foreground, getColor(new String(chars, lastStart, i - lastStart)));
							setCharacterAttributes(lastStart, i - lastStart, attributeSet, true);
						}
						lastStart = i + 1;
						charactersSinceLastStart = false;
					} else {
						charactersSinceLastStart = true;
					}
				}
			}
		});

	}

	/**
	 * This must return the color of the given word.
	 */
	protected abstract Color getColor(String word);

}