private NetcdfDataset openDataset(
InvDataset invDataset, boolean acquire, ucar.nc2.util.CancelTask task, Result result)
throws IOException {
IOException saveException = null;
List<InvAccess> accessList =
new ArrayList<InvAccess>(invDataset.getAccess()); // a list of all the accesses
while (accessList.size() > 0) {
InvAccess access = chooseDatasetAccess(accessList);
// no valid access
if (access == null) {
result.errLog.format("No access that could be used in dataset %s %n", invDataset);
if (saveException != null) throw saveException;
return null;
}
String datasetLocation = access.getStandardUrlName();
ServiceType serviceType = access.getService().getServiceType();
if (debugOpen)
System.out.println("ThreddsDataset.openDataset try " + datasetLocation + " " + serviceType);
// deal with RESOLVER type
if (serviceType == ServiceType.RESOLVER) {
InvDatasetImpl rds = openResolver(datasetLocation, task, result);
if (rds == null) return null;
accessList = new ArrayList<InvAccess>(rds.getAccess());
continue;
}
// ready to open it through netcdf API
NetcdfDataset ds;
// try to open
try {
ds = openDataset(access, acquire, task, result);
} catch (IOException e) {
result.errLog.format("Cant open %s %n err=%s%n", datasetLocation, e.getMessage());
if (debugOpen) {
System.out.println("Cant open= " + datasetLocation + " " + serviceType);
e.printStackTrace();
}
accessList.remove(access);
saveException = e;
continue;
}
result.accessUsed = access;
return ds;
} // loop over accesses
if (saveException != null) throw saveException;
return null;
}
@Override
public String getViewerLinkHtml(InvDatasetImpl ds, HttpServletRequest req) {
InvAccess access = ds.getAccess(ServiceType.WMS);
URI dataURI = access.getStandardUri();
try {
URI base = new URI(req.getRequestURL().toString());
dataURI = base.resolve(dataURI);
} catch (URISyntaxException e) {
return "Error generating viewer link";
}
// ToDo Switch to use TdsContext.getContextPath()
return "<a href='"
+ ServletUtil.getContextPath()
+ "/godiva2/godiva2.html?server="
+ dataURI.toString()
+ "'>Godiva2 (browser-based)</a>";
}
/** Returns true if this is a gridded dataset that is accessible via WMS. */
@Override
public boolean isViewable(InvDatasetImpl ds) {
InvAccess access = ds.getAccess(ServiceType.WMS);
return (access != null) && (ds.getDataType() == FeatureType.GRID);
}