/** Tries to build a GVTFontFamily from a URL reference */
protected GVTFontFamily getFontFamily(BridgeContext ctx, ParsedURL purl) {
String purlStr = purl.toString();
Element e = getBaseElement(ctx);
SVGDocument svgDoc = (SVGDocument) e.getOwnerDocument();
String docURL = svgDoc.getURL();
ParsedURL pDocURL = null;
if (docURL != null) pDocURL = new ParsedURL(docURL);
// try to load an SVG document
String baseURI = AbstractNode.getBaseURI(e);
purl = new ParsedURL(baseURI, purlStr);
UserAgent userAgent = ctx.getUserAgent();
try {
userAgent.checkLoadExternalResource(purl, pDocURL);
} catch (SecurityException ex) {
// Can't load font - Security violation.
// We should not throw the error that is for certain, just
// move down the font list, but do we display the error or not???
// I'll vote yes just because it is a security exception (other
// exceptions like font not available etc I would skip).
userAgent.displayError(ex);
return null;
}
if (purl.getRef() != null) {
// Reference must be to a SVGFont.
Element ref = ctx.getReferencedElement(e, purlStr);
if (!ref.getNamespaceURI().equals(SVG_NAMESPACE_URI)
|| !ref.getLocalName().equals(SVG_FONT_TAG)) {
return null;
}
SVGDocument doc = (SVGDocument) e.getOwnerDocument();
SVGDocument rdoc = (SVGDocument) ref.getOwnerDocument();
Element fontElt = ref;
if (doc != rdoc) {
fontElt = (Element) doc.importNode(ref, true);
String base = AbstractNode.getBaseURI(ref);
Element g = doc.createElementNS(SVG_NAMESPACE_URI, SVG_G_TAG);
g.appendChild(fontElt);
g.setAttributeNS(XMLConstants.XML_NAMESPACE_URI, "xml:base", base);
CSSUtilities.computeStyleAndURIs(ref, fontElt, purlStr);
}
// Search for a font-face element
Element fontFaceElt = null;
for (Node n = fontElt.getFirstChild(); n != null; n = n.getNextSibling()) {
if ((n.getNodeType() == Node.ELEMENT_NODE)
&& n.getNamespaceURI().equals(SVG_NAMESPACE_URI)
&& n.getLocalName().equals(SVG_FONT_FACE_TAG)) {
fontFaceElt = (Element) n;
break;
}
}
// todo : if the above loop fails to find a fontFaceElt, a null is passed to createFontFace()
SVGFontFaceElementBridge fontFaceBridge;
fontFaceBridge =
(SVGFontFaceElementBridge) ctx.getBridge(SVG_NAMESPACE_URI, SVG_FONT_FACE_TAG);
GVTFontFace gff = fontFaceBridge.createFontFace(ctx, fontFaceElt);
return new SVGFontFamily(gff, fontElt, ctx);
}
// Must be a reference to a 'Web Font'.
try {
return ctx.getFontFamilyResolver().loadFont(purl.openStream(), this);
} catch (Exception ex) {
}
return null;
}
