private void parseChildren(SafeXmlPullParser parser, D doc, E element) {
boolean done = false;
do {
N child = null;
parser.next();
switch (parser.getCurrentType()) {
case TEXT:
child = parseText(parser, doc, element);
break;
case START_ELEMENT:
child = parseElement(parser, doc, element);
break;
case END_ELEMENT:
done = true;
break;
}
if (child != null) {
doc.insertBefore(element, child, null);
}
// This is a bit of judgment call. If this happens, the document is
// invalid, since the closing tag is missing. By exiting the loop when
// parser is out of tokens we're silently repairing the invalid doc.
} while (!done && parser.hasNext());
}
/**
* Parses an element.
*
* @param parser tokenizer
* @param parentElement the parent element to attach the parsed node to
* @return a new element.
*/
private E parseElement(SafeXmlPullParser parser, D doc, E parentElement) {
E element =
doc.createElement(
parser.getTagName(),
CollectionUtils.newJavaMap(parser.getAttributes()),
parentElement,
null);
parseChildren(parser, doc, element);
return element;
}
/**
* Parses a text node.
*
* @param parser tokenizer
* @param parentElement the parent element to attach the parsed node to
* @return a new text node.
*/
private T parseText(SafeXmlPullParser parser, D doc, E parentElement) {
String text = parser.getText();
T child = null;
if (text.length() > 0) {
child = doc.createTextNode(text, parentElement, null);
}
return child;
}
/**
* @param xmlString
* @return parsed string
*/
public D parse(String xmlString) {
SafeXmlPullParser parser;
try {
parser = XmlParserFactory.buffered(xmlString);
} catch (XmlParseException e) {
throw new RuntimeException("Cannot parse xml: " + xmlString, e);
}
// TODO(ohler): This can be an infinite loop. Fix that.
while (parser.getCurrentType() != ItemType.START_ELEMENT) {
parser.next();
}
D document =
factory.create(parser.getTagName(), CollectionUtils.newJavaMap(parser.getAttributes()));
parseChildren(parser, document, document.getDocumentElement());
return document;
}
