/**
* Processes MathML data.
*
* @param element MathML data element
* @param block parent block
* @throws DocumentException if some error occurs
*/
private void processMath(Element element, Block<Atom> block) throws DocumentException {
try {
element.setAttribute("xmlns:m", URI_M);
element.setAttribute("xmlns:w", URI_W);
ByteArrayOutputStream omml = new ByteArrayOutputStream();
DomUtil.save(element, omml);
Source xsl = new StreamSource(getClass().getResourceAsStream(XSL_OMML2MML));
Source xml = new StreamSource(new ByteArrayInputStream(omml.toByteArray()));
DOMResult mml = new DOMResult();
XslUtil.transform(xml, xsl, mml);
LayoutContextImpl context =
new LayoutContextImpl(LayoutContextImpl.getDefaultLayoutContext());
Float fontSize = (Float) context.getParameter(Parameter.MATHSIZE);
final float factor = 1.5F;
context.setParameter(Parameter.MATHSIZE, factor * fontSize);
context.setParameter(Parameter.MFRAC_KEEP_SCRIPTLEVEL, Boolean.FALSE);
ByteArrayOutputStream out = new ByteArrayOutputStream();
ConverterRegistry.getInstance()
.getConverter("image/png")
.convert(mml.getNode(), context, out);
Image image = new Image();
mathImageIndex++;
final String imageName = "mml-" + mathImageIndex + ".png";
image.setUrl(imageName);
image.setAlt(imageName);
image.setData(out.toByteArray());
block.add(image);
} catch (XmlException e) {
throw new DocumentException(e);
} catch (IOException e) {
throw new DocumentException(e);
}
}
/**
* Provides root node of given data stream.
*
* @param zip ZIP input stream
* @return root node
* @throws DocumentException if some error occurs
*/
private Node getContext(ZipInputStream zip) throws DocumentException {
try {
return DomUtil.open(getInputStream(zip));
} catch (XmlException e) {
throw new DocumentException(e);
}
}