HTML to HSLFTextBox

package org.apache.poi.hslf.usermodel;

import java.awt.Color;
import java.awt.Rectangle;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.util.Enumeration;

import javax.swing.JTextPane;
import javax.swing.text.AttributeSet;
import javax.swing.text.Element;
import javax.swing.text.StyledDocument;
import javax.swing.text.html.CSS;
import javax.swing.text.html.HTMLDocument;
import javax.swing.text.html.HTMLEditorKit;

import org.junit.Test;

public class TestBla {

    @Test
    public void htmlToTextbox() throws Exception {
        // adding the empty slide
        HSLFSlideShow ppt = new HSLFSlideShow();
        HSLFSlide s = ppt.createSlide();
        HSLFTextBox title = s.addTitle();
        title.setText(" "); // doesn't work if an empty string is used
        HSLFTextRun rt = title.getTextParagraphs().get(0).getTextRuns().get(0);
        rt.setFontColor(Color.black);
        rt.setFontFamily("Arial");
        rt.setFontSize(44.);

        Rectangle anchorInTheSlide = new java.awt.Rectangle(5, 5, 710, 125);
        title.setAnchor(anchorInTheSlide);


        // prepare
        JTextPane pad = new JTextPane();
        pad.setContentType("text/html");
        HTMLEditorKit kit = (HTMLEditorKit)pad.getEditorKit();
        HTMLDocument htmldoc = (HTMLDocument)kit.createDefaultDocument();
        kit.insertHTML(htmldoc, htmldoc.getLength(), "<p>paragraph <i>1</i></p>", 0, 0, null);
        kit.insertHTML(htmldoc, htmldoc.getLength(), "<p>paragraph <span style=\"color:red\">2</span></p>", 0, 0, null);
        pad.setDocument(htmldoc);


        // convert
        StyledDocument doc = pad.getStyledDocument();

        int lastPos=-1;
        while (lastPos < doc.getLength()) {
            Element line = doc.getParagraphElement(lastPos+1);
            lastPos = line.getEndOffset();

            boolean newParagraph = true;
            for (int elIdx=0; elIdx < line.getElementCount(); elIdx++) {
                final Element frag = line.getElement(elIdx);
                String subtext = doc.getText(frag.getStartOffset(), frag.getEndOffset()-frag.getStartOffset());

                HSLFTextRun run = title.appendText(subtext, newParagraph);
                newParagraph = false;

                final AttributeSet as = frag.getAttributes();
                final Enumeration<?> ae = as.getAttributeNames();

                while (ae.hasMoreElements()) {
                    final Object attrib = ae.nextElement();

                    if (CSS.Attribute.COLOR.equals(attrib)) {
                        // I don't know how to really work with the CSS-swing class ...
                        Field f = as.getAttribute(attrib).getClass().getDeclaredField("c");
                        f.setAccessible(true);
                        Color c = (Color)f.get(as.getAttribute(attrib));
                        run.setFontColor(c);
                    } else if (CSS.Attribute.FONT_STYLE.equals(attrib)) {
                        if ("italic".equals(as.getAttribute(attrib).toString())) {
                            run.setItalic(true);
                        }
                    } else if (CSS.Attribute.FONT_WEIGHT.equals(attrib)) {
                        if ("bold".equals(as.getAttribute(attrib).toString())) {
                            run.setBold(true);
                        }
                    }
                }
            }
        }

        FileOutputStream fos = new FileOutputStream("bla.ppt");
        ppt.write(fos);
        fos.close();
    }
}