/**
* Loads group's children from given source DOM {@link Element}.
*
* <ul>
* <li>Unsupported (unknown) children are skipped.
* <li>Wrong order of children is ignored (children are loaded in correct order).
* </ul>
*
* @param element source DOM {@link Element}
* @param context current {@link LoadingContext} callback
*/
public void load(final Element element, final LoadingContext context) {
for (final NodeGroup<?, ?> group : groups) {
group.getChildren().clear();
}
final NodeList childNodes = element.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++) {
final Node childNode = childNodes.item(i);
boolean childLoaded = false;
for (final NodeGroup<?, ?> group : groups) {
if (group.loadChildIfSupported(childNode, context)) {
childLoaded = true;
break;
}
}
if (!childLoaded) {
/* No NodeGroup supports this child */
if (childNode.getNodeType() == Node.TEXT_NODE
&& childNode.getNodeValue().trim().isEmpty()) {
/* Whitespace node, so we'll ignore this */
} else {
/* Register error */
final String childName =
childNode.getNodeType() == Node.ELEMENT_NODE ? childNode.getLocalName() : "(text)";
context.modelBuildingError(new QtiIllegalChildException(parent, childName), childNode);
}
}
}
}
private static final <V> void loadAttribute(
final Attribute<V> attribute,
final Element element,
final String stringValue,
final LoadingContext context) {
Assert.notNull(stringValue, "stringValue");
V value = null;
try {
value = attribute.parseDomAttributeValue(stringValue);
} catch (final QtiParseException ex) {
context.modelBuildingError(ex, element);
}
attribute.setValue(value);
}