// Canibalized from Hadoop <code>Configuration.loadResource()</code>.
private void parseDocument(Document doc) throws IOException {
Element root = doc.getDocumentElement();
if (!"configuration".equals(root.getTagName())) {
throw new IOException("bad conf file: top-level element not <configuration>");
}
processNodes(root);
}
// Canibalized from Hadoop <code>Configuration.loadResource()</code>.
private void processNodes(Element root) throws IOException {
try {
NodeList props = root.getChildNodes();
for (int i = 0; i < props.getLength(); i++) {
Node propNode = props.item(i);
if (!(propNode instanceof Element)) {
continue;
}
Element prop = (Element) propNode;
if (prop.getTagName().equals("configuration")) {
processNodes(prop);
continue;
}
if (!"property".equals(prop.getTagName())) {
throw new IOException("bad conf file: element not <property>");
}
NodeList fields = prop.getChildNodes();
String attr = null;
String value = null;
for (int j = 0; j < fields.getLength(); j++) {
Node fieldNode = fields.item(j);
if (!(fieldNode instanceof Element)) {
continue;
}
Element field = (Element) fieldNode;
if ("name".equals(field.getTagName()) && field.hasChildNodes()) {
attr = ((Text) field.getFirstChild()).getData().trim();
}
if ("value".equals(field.getTagName()) && field.hasChildNodes()) {
value = ((Text) field.getFirstChild()).getData();
}
}
if (attr != null && value != null) {
set(attr, value);
}
}
} catch (DOMException e) {
throw new IOException(e);
}
}