/**
* Creates an instance bound to url. If <code>acceptDeflate</code> is true then HTTP Request
* headers will indicate to servers that this client can accept compressed documents.
*
* @param urlString Connect to this URL.
* @param acceptCompress true if this client will accept compressed responses
* @throws FileNotFoundException thrown if <code>urlString</code> is not a valid URL, or a
* filename which exists on the system.
*/
public DConnect2(String urlString, boolean acceptCompress) throws FileNotFoundException {
int ceIndex = urlString.indexOf('?');
if (ceIndex != -1) {
this.urlString = urlString.substring(0, ceIndex);
String expr = urlString.substring(ceIndex);
int selIndex = expr.indexOf('&');
if (selIndex != -1) {
this.projString = expr.substring(0, selIndex);
this.selString = expr.substring(selIndex);
} else {
this.projString = expr;
this.selString = "";
}
} else {
this.urlString = urlString;
this.projString = this.selString = "";
}
this.acceptCompress = acceptCompress;
// capture encoded url
this.urlStringEncoded = EscapeStrings.escapeURL(this.urlString);
// Check out the URL to see if it is file://
try {
URL testURL = new URL(urlString);
if ("file".equals(testURL.getProtocol())) {
filePath = testURL.getPath();
// See if .dds and .dods files exist
File f = new File(filePath + ".dds");
if (!f.canRead()) {
throw new FileNotFoundException("file not readable: " + urlString + ".dds");
}
f = new File(filePath + ".dods");
if (!f.canRead()) {
throw new FileNotFoundException("file not readable: " + urlString + ".dods");
}
}
/* Set the server version cause we won't get it from anywhere */
ver = new ServerVersion(ServerVersion.DAP2_PROTOCOL_VERSION, ServerVersion.XDAP);
} catch (DAP2Exception ex) {
throw new FileNotFoundException("Cannot set server version");
} catch (MalformedURLException e) {
throw new FileNotFoundException("Malformed URL: " + urlString);
}
}
/**
* Returns the DAS object from the dataset referenced by this object's URL. The DAS object is
* referred to by appending `.das' to the end of a DODS URL.
*
* @return the DAS associated with the referenced dataset.
* @throws MalformedURLException if the URL given to the constructor has an error
* @throws IOException if an error connecting to the remote server
* @throws ParseException if the DAS parser returned an error
* @throws DASException on an error constructing the DAS
* @throws DAP2Exception if an error returned by the remote server
*/
public DAS getDAS() throws IOException, ParseException, DAP2Exception {
DASCommand command = new DASCommand();
if (filePath != null) { // url was file:
File daspath = new File(filePath + ".das");
// See if the das file exists
if (daspath.canRead()) {
command.process(new FileInputStream(daspath));
}
} else if (stream != null) {
command.process(stream);
} else { // assume url is remote
try {
openConnection(urlStringEncoded + ".das" + projString + selString, command);
} catch (DAP2Exception de) {
// if(de.getErrorCode() != DAP2Exception.NO_SUCH_FILE)
// throw de; // rethrow
}
}
return command.das;
}
/**
* Returns the `Data object' from the dataset referenced by this object's URL given the constraint
* expression CE. Note that the Data object is really just a DDS object with data bound to the
* variables. The DDS will probably contain fewer variables (and those might have different types)
* than in the DDS returned by getDDS() because that method returns the entire DDS (but without
* any data) while this method returns only those variables listed in the projection part of the
* constraint expression.
*
* <p>Note that if CE is an empty String then the entire dataset will be returned, unless a
* "sticky" CE has been specified in the constructor.
*
* @param CE The constraint expression to be applied to this request by the server. This is
* combined with any CE given in the constructor.
* @param statusUI the <code>StatusUI</code> object to use for GUI updates and user cancellation
* notification (may be null).
* @param btf The <code>BaseTypeFactory</code> to build the member variables in the DDS with.
* @return The <code>DataDDS</code> object that results from applying the given CE, combined with
* this object's sticky CE, on the referenced dataset.
* @throws MalformedURLException if the URL given to the constructor has an error
* @throws IOException if any error connecting to the remote server
* @throws ParseException if the DDS parser returned an error
* @throws DDSException on an error constructing the DDS
* @throws DAP2Exception if any error returned by the remote server
*/
public DataDDS getData(String CE, StatusUI statusUI, BaseTypeFactory btf)
throws MalformedURLException, IOException, ParseException, DDSException, DAP2Exception {
DataDDS dds = new DataDDS(ver, btf);
DataDDSCommand command = new DataDDSCommand(dds, statusUI);
command.setURL(urlString + "?" + CE);
if (filePath != null) { // url is file:
File dodspath = new File(filePath + ".dods");
// See if the dods file exists
if (dodspath.canRead()) {
/* WARNING: any constraints are ignored in reading the file */
command.process(new FileInputStream(dodspath));
}
} else if (stream != null) {
command.process(stream);
} else {
String urls = urlStringEncoded + ".dods" + EscapeStrings.escapeURLQuery(getCompleteCE(CE));
openConnection(urls, command);
}
return command.dds;
}
