/**
* Get attribute value from current start tag. Throws an error if the attribute value is not found
* in the start tag.
*
* @param name attribute name to be found
* @return attribute value text
* @throws IOException if error reading document
* @throws XmlPullParserException if attribute not present
*/
protected String attributeValue(String name) throws IOException, XmlPullParserException {
String value = m_startTag.getAttributeValueFromName(null, name);
if (value == null) {
throw new XmlPullParserException("Missing attribute " + name);
} else {
return value;
}
}
/**
* Parse start of element from document. Ignores character data to next start or end tag, but
* throws exception if an end tag is seen before a start tag, or if the start tag seen does not
* match the expected name.
*
* @param tag element name expected
* @throws IOException if error reading document
* @throws XmlPullParserException if expected element not found, or if other parse error
*/
protected void parseStartTag(String tag) throws IOException, XmlPullParserException {
while (true) {
switch (m_parser.next()) {
case XmlPullParser.START_TAG:
m_parser.readStartTag(m_startTag);
if (m_startTag.getLocalName().equals(tag)) {
return;
}
// fall through for error handling
case XmlPullParser.END_TAG:
case XmlPullParser.END_DOCUMENT:
throw new XmlPullParserException("Missing expected start tag " + tag);
}
}
}
/**
* Parse and process trade history information stream.
*
* @param in XML document reader
* @throws IOException if error reading document
* @throws XmlPullParserException on document parse error
*/
public void parse(Reader in) throws IOException, XmlPullParserException {
// set document source for parse
m_parser.reset();
m_parser.setInput(in);
// main pull parsing loop
byte type;
while ((type = m_parser.next()) != XmlPullParser.END_DOCUMENT) {
// ignore everything other than a start tag
if (type == XmlPullParser.START_TAG) {
// process the start tags we're interested in
m_parser.readStartTag(m_startTag);
String lname = m_startTag.getLocalName();
if (lname.equals(STOCK_ELEMENT_NAME)) {
parseStockTrade();
} else if (lname.equals(OPTION_ELEMENT_NAME)) {
parseOptionTrade();
}
}
}
}