/** Deserializes the object from XML */
public DataField parseField(XMLStreamReader in) throws IOException, XMLStreamException {
String label = in.getAttributeValue(null, "label");
String type = in.getAttributeValue(null, "type");
String var = in.getAttributeValue(null, "var");
DataField field = new DataField(type, var, label);
ArrayList<DataValue> valueList = new ArrayList<DataValue>();
ArrayList<DataOption> optionList = new ArrayList<DataOption>();
int tag = in.nextTag();
while (tag > 0) {
if (_isFinest) debug(in);
if (XMLStreamReader.END_ELEMENT == tag) {
field.setValueList(valueList);
field.setOptionList(optionList);
return field;
}
if (XMLStreamReader.START_ELEMENT == tag && "desc".equals(in.getLocalName())) {
String desc = in.getElementText();
field.setDesc(desc);
skipToEnd(in, "desc");
} else if (XMLStreamReader.START_ELEMENT == tag && "option".equals(in.getLocalName())) {
optionList.add(parseOption(in));
} else if (XMLStreamReader.START_ELEMENT == tag && "required".equals(in.getLocalName())) {
field.setRequired(true);
skipToEnd(in, "required");
} else if (XMLStreamReader.START_ELEMENT == tag && "value".equals(in.getLocalName())) {
String value = in.getElementText();
valueList.add(new DataValue(value));
skipToEnd(in, "value");
} else if (XMLStreamReader.START_ELEMENT == tag) {
log.finer(this + " <" + in.getLocalName() + "> is an unknown tag");
skipToEnd(in, in.getLocalName());
}
tag = in.nextTag();
}
skipToEnd(in, "field");
return field;
}
private static Element parseElement(XMLStreamReader xsr) throws XMLStreamException {
// xsr points to a START_ELEMENT event. Create the element and read all its attributes
// Then read all its children events
Element element = new Element(xsr.getLocalName());
// text that will be added to the element. Text can come in different events, so we add it here
// and add it to the element at the end
StringBuilder elementText = new StringBuilder();
int attributeCount = xsr.getAttributeCount();
for (int i = 0; i < attributeCount; i++) {
element.putAttribute(xsr.getAttributeLocalName(i), xsr.getAttributeValue(i));
}
while (xsr.hasNext()) {
xsr.next();
if (xsr.getEventType() == XMLStreamConstants.END_ELEMENT) {
// element is closed. Move the cursor and return it
// check if there is some text to add before (empty text is not added, but added text is not
// trimmed)
// we set empty text also if the element has no children
if (!elementText.toString().trim().isEmpty() || !element.hasChildren()) {
element.setText(elementText.toString());
}
// xsr.next();
return element;
} else if (xsr.getEventType() == XMLStreamConstants.CHARACTERS) {
// an attribute of the current element
elementText.append(xsr.getText());
} else if (xsr.getEventType() == XMLStreamConstants.START_ELEMENT) {
// new element begins -> read it recursively and add it to the current element
element.addChild(parseElement(xsr));
}
}
// we reached the end of the document without the tag end -> error parsing
throw new XMLStreamException(
"End of the document unexpectedly reached. Element " + element.getName() + " not closed");
}
private static void printAttributes(XMLStreamReader xmlr) {
if (xmlr.getAttributeCount() > 0) {
int count = xmlr.getAttributeCount();
for (int i = 0; i < count; i++) {
QName name = xmlr.getAttributeName(i);
String namespace = xmlr.getAttributeNamespace(i);
String type = xmlr.getAttributeType(i);
String prefix = xmlr.getAttributePrefix(i);
String value = xmlr.getAttributeValue(i);
System.out.println(
"\tAttribute: {" + namespace + "}:" + name.toString() + "(" + type + ")=" + value);
}
}
}
public static void main(String[] args) throws Exception {
String urlString;
if (args.length == 0) {
urlString = "http://www.w3c.org";
System.out.println("Using " + urlString);
} else urlString = args[0];
URL url = new URL(urlString);
InputStream in = url.openStream();
XMLInputFactory factory = XMLInputFactory.newInstance();
XMLStreamReader parser = factory.createXMLStreamReader(in);
while (parser.hasNext()) {
int event = parser.next();
if (event == XMLStreamConstants.START_ELEMENT) {
if (parser.getLocalName().equals("a")) {
String href = parser.getAttributeValue(null, "href");
if (href != null) System.out.println(href);
}
}
}
}
/** Deserializes the object from XML */
public DataOption parseOption(XMLStreamReader in) throws IOException, XMLStreamException {
String label = in.getAttributeValue(null, "label");
DataOption option = new DataOption(label);
ArrayList<DataValue> valueList = new ArrayList<DataValue>();
int tag = in.nextTag();
while (tag > 0) {
if (_isFinest) debug(in);
if (XMLStreamReader.END_ELEMENT == tag) {
option.setValueList(valueList);
return option;
}
if (XMLStreamReader.START_ELEMENT == tag && "value".equals(in.getLocalName())) {
String value = in.getElementText();
valueList.add(new DataValue(value));
skipToEnd(in, "value");
} else if (XMLStreamReader.START_ELEMENT == tag) {
log.finer(this + " <" + in.getLocalName() + "> is an unknown tag");
skipToEnd(in, in.getLocalName());
}
tag = in.nextTag();
}
skipToEnd(in, "option");
return option;
}
