/* (non-Javadoc)
* @see org.bedework.synch.ConnectorInstance#changed()
*/
@Override
public boolean changed() throws SynchException {
/* This implementation needs to at least check the change token for the
* collection and match it against the stored token.
*/
if (info.getChangeToken() == null) {
fetchedIcal = null; // Force refetch
return true;
}
DavClient cl = getClient();
try {
int rc = cl.sendRequest("HEAD", info.getUri(), null);
if (rc != HttpServletResponse.SC_OK) {
info.setLastRefreshStatus(String.valueOf(rc));
if (debug) {
trace("Unsuccessful response from server was " + rc);
}
info.setChangeToken(null); // Force refresh next time
fetchedIcal = null; // Force refetch
return true;
}
String etag = cl.getResponse().getResponseHeaderValue("Etag");
if (etag == null) {
if (debug) {
trace("Received null etag");
}
return false;
}
if (debug) {
trace("Received etag:" + etag + ", ours=" + info.getChangeToken());
}
if (info.getChangeToken().equals(etag)) {
return false;
}
fetchedIcal = null; // Force refetch
return true;
} catch (SynchException se) {
throw se;
} catch (Throwable t) {
throw new SynchException(t);
} finally {
try {
client.release();
} catch (Throwable t) {
}
}
}
/* Fetch the iCalendar for the subscription. If it fails set the status and
* return null. Unchanged data will return null with no status change.
*/
private void getIcal() throws SynchException {
try {
if (fetchedIcal != null) {
return;
}
getClient();
Header[] hdrs = null;
if ((uidMap != null) && (info.getChangeToken() != null) && (fetchedIcal != null)) {
hdrs = new Header[] {new BasicHeader("If-None-Match", info.getChangeToken())};
}
int rc = client.sendRequest("GET", info.getUri(), hdrs);
info.setLastRefreshStatus(String.valueOf(rc));
if (rc == HttpServletResponse.SC_NOT_MODIFIED) {
// Data unchanged.
if (debug) {
trace("data unchanged");
}
return;
}
if (rc != HttpServletResponse.SC_OK) {
info.setLastRefreshStatus(String.valueOf(rc));
if (debug) {
trace("Unsuccessful response from server was " + rc);
}
info.setChangeToken(null); // Force refresh next time
return;
}
CalendarBuilder builder = new CalendarBuilder();
InputStream is = client.getResponse().getContentStream();
Calendar ical = builder.build(is);
/* Convert each entity to XML */
fetchedIcal = IcalToXcal.fromIcal(ical, null);
uidMap = new HashMap<String, MapEntry>();
prodid = null;
for (VcalendarType vcal : fetchedIcal.getVcalendar()) {
/* Extract the prodid from the converted calendar - we use it when we
* generate a new icalendar for each entity.
*/
if ((prodid == null) && (vcal.getProperties() != null)) {
for (JAXBElement<? extends BasePropertyType> pel :
vcal.getProperties().getBasePropertyOrTzid()) {
if (pel.getValue() instanceof ProdidPropType) {
prodid = ((ProdidPropType) pel.getValue()).getText();
break;
}
}
}
for (JAXBElement<? extends BaseComponentType> comp :
vcal.getComponents().getBaseComponent()) {
UidPropType uidProp = (UidPropType) XcalUtil.findProperty(comp.getValue(), XcalTags.uid);
if (uidProp == null) {
// Should flag as an error
continue;
}
String uid = uidProp.getText();
MapEntry me = uidMap.get(uid);
if (me == null) {
me = new MapEntry();
me.uid = uid;
uidMap.put(uidProp.getText(), me);
}
LastModifiedPropType lm =
(LastModifiedPropType) XcalUtil.findProperty(comp.getValue(), XcalTags.lastModified);
String lastmod = null;
if (lm != null) {
lastmod = lm.getUtcDateTime().toXMLFormat();
}
if (Util.cmpObjval(me.lastMod, lastmod) < 0) {
me.lastMod = lastmod;
}
me.comps.add(comp);
}
}
/* Looks like we translated ok. Save any etag and delete everything in the
* calendar.
*/
String etag = client.getResponse().getResponseHeaderValue("Etag");
if (etag != null) {
info.setChangeToken(etag);
}
} catch (SynchException se) {
throw se;
} catch (Throwable t) {
throw new SynchException(t);
} finally {
try {
client.release();
} catch (Throwable t) {
}
}
}