private TtmlNode parseNode(XmlPullParser parser, TtmlNode parent) throws ParserException {
long duration = 0;
long startTime = TtmlNode.UNDEFINED_TIME;
long endTime = TtmlNode.UNDEFINED_TIME;
String[] styleIds = null;
int attributeCount = parser.getAttributeCount();
TtmlStyle style = parseStyleAttributes(parser, null);
for (int i = 0; i < attributeCount; i++) {
String attr = ParserUtil.removeNamespacePrefix(parser.getAttributeName(i));
String value = parser.getAttributeValue(i);
if (attr.equals(ATTR_BEGIN)) {
startTime =
parseTimeExpression(value, DEFAULT_FRAMERATE, DEFAULT_SUBFRAMERATE, DEFAULT_TICKRATE);
} else if (attr.equals(ATTR_END)) {
endTime =
parseTimeExpression(value, DEFAULT_FRAMERATE, DEFAULT_SUBFRAMERATE, DEFAULT_TICKRATE);
} else if (attr.equals(ATTR_DURATION)) {
duration =
parseTimeExpression(value, DEFAULT_FRAMERATE, DEFAULT_SUBFRAMERATE, DEFAULT_TICKRATE);
} else if (attr.equals(ATTR_STYLE)) {
// IDREFS: potentially multiple space delimited ids
String[] ids = parseStyleIds(value);
if (ids.length > 0) {
styleIds = ids;
}
} else {
// Do nothing.
}
}
if (parent != null && parent.startTimeUs != TtmlNode.UNDEFINED_TIME) {
if (startTime != TtmlNode.UNDEFINED_TIME) {
startTime += parent.startTimeUs;
}
if (endTime != TtmlNode.UNDEFINED_TIME) {
endTime += parent.startTimeUs;
}
}
if (endTime == TtmlNode.UNDEFINED_TIME) {
if (duration > 0) {
// Infer the end time from the duration.
endTime = startTime + duration;
} else if (parent != null && parent.endTimeUs != TtmlNode.UNDEFINED_TIME) {
// If the end time remains unspecified, then it should be inherited from the parent.
endTime = parent.endTimeUs;
}
}
return TtmlNode.buildNode(parser.getName(), startTime, endTime, style, styleIds);
}
