/**
* Takes a stream that is assumed to contain a single complete material
* definition,
* reads the definition and produces a new Material object. If many definitions
* are present then the first one is read
* @param istr A reference to a stream
* @return A new Material object
*/
Material MaterialXMLParser::parse(std::istream &istr) const {
using namespace Poco::XML;
typedef AutoPtr<Document> DocumentPtr;
InputSource src(istr);
DOMParser parser;
// Do not use auto here or anywhereas the Poco API returns raw pointers
// but in some circumstances requires AutoPtrs to manage the memory
DocumentPtr doc;
try {
doc = parser.parse(&src);
} catch (SAXParseException &exc) {
std::ostringstream os;
os << "MaterialXMLReader::read() - Error parsing stream as XML: "
<< exc.what();
throw std::invalid_argument(os.str());
}
Element *rootElement = doc->documentElement();
// Iterating is apparently much faster than getElementsByTagName
NodeIterator nodeIter(rootElement, NodeFilter::SHOW_ELEMENT);
Node *node = nodeIter.nextNode();
Material matr;
bool found(false);
while (node) {
if (node->nodeName() == MATERIAL_TAG) {
matr = parse(static_cast<Element *>(node));
found = true;
break;
}
node = nodeIter.nextNode();
}
if (!found) {
throw std::invalid_argument(
"MaterialXMLReader::read() - No material tags found.");
}
return matr;
}
