/**
* This method is called to send a the results of an asynchronous service execution to a
* requesting component.
*
* @param input Object containing information on the requesting component
* @param atts AttributeNameValues containing the service results
* @return result of sending the service results
* @see CommunicationsHandler#userRequest(DataObject,String,String,int)
*/
protected DataObject sendServiceResult(ServiceInput input, Attributes atts) {
Vector v = new Vector();
v.addElement(new DataObject(Constants.ID, input.getId()));
input.setInput(null);
v.addElement(input.toDataObject());
v.addElement(atts.toDataObject());
DataObject result = new DataObject(SERVICE_RESULT, v);
try {
return comm.userRequest(
result, SERVICE_RESULT, input.getHostname(), Integer.parseInt(input.getPort()));
} catch (DecodeException de) {
System.out.println("Service sendServiceResult() Decode: " + de);
} catch (EncodeException ee) {
System.out.println("Service sendServiceResult() Encode: " + ee);
} catch (InvalidDecoderException ide) {
System.out.println("Service sendServiceResult() InvalidDecoder: " + ide);
} catch (InvalidEncoderException iee) {
System.out.println("Service sendServiceResult() InvalidEncoder: " + iee);
} catch (InvalidProtocolException ipe) {
System.out.println("Service sendServiceResult() InvalidProtocol: " + ipe);
} catch (ProtocolException pe) {
System.out.println("Service sendServiceResult() Protocol: " + pe);
} catch (IOException io) {
System.out.println("Service sendServiceResult() IOException: " + io);
}
return null;
}
/**
* This method ensures that the incoming attributes are correct and calls interpretData(). It
* returns the interpreted results.
*
* @param data Incoming interpret request
* @param error Incoming error, if any
* @return interpreted results
* @see #interpretData(AttributeNameValues)
*/
public DataObject callInterpreter(DataObject data, String error) {
Vector v = new Vector();
DataObject result = new DataObject(INTERPRET_REPLY, v);
Attributes dataToInterpret = null;
Error err = new Error(error);
if (err.getError() == null) {
dataToInterpret = new Attributes(data);
if (dataToInterpret == null) {
err.setError(Error.MISSING_PARAMETER_ERROR);
} else if (!canHandle(dataToInterpret)) {
err.setError(Error.INVALID_ATTRIBUTE_ERROR);
}
}
if (err.getError() == null) {
Attributes interpreted = interpretData(dataToInterpret);
if (interpreted != null) {
v.addElement(interpreted.toDataObject());
err.setError(Error.NO_ERROR);
} else {
err.setError(Error.INVALID_DATA_ERROR);
}
}
v.addElement(err.toDataObject());
return result;
}
/**
* This method converts the service function info to a DataObject
*
* @return FunctionDescription object converted to a <FUNCTION> DataObject
*/
public DataObject toDataObject() {
DataObjects v = new DataObjects();
v.addElement(new DataObject(FUNCTION_NAME, name));
v.addElement(new DataObject(FUNCTION_DESCRIPTION, description));
if (attributes != null) {
v.addElement(attributes.toDataObject());
}
v.addElement(new DataObject(FUNCTION_SYNCHRONICITY, synchronicity));
return new DataObject(FUNCTION, v);
}
/**
* This method converts the subscriber info to a DataObject
*
* @return Subscriber object converted to a <SUBSCRIBER> DataObject
*/
public DataObject toDataObject() {
Vector v = new Vector();
v.addElement(new DataObject(SUBSCRIBER_ID, id));
v.addElement(new DataObject(HOSTNAME, host));
v.addElement(new DataObject(PORT, Integer.toString(port)));
v.addElement(new DataObject(CALLBACK_NAME, callback));
v.addElement(new DataObject(CALLBACK_TAG, tag));
v.addElement(conditions.toDataObject());
v.addElement(attributes.toDataObject());
return new DataObject(SUBSCRIBER, v);
}
/**
* This method runs a query on a widget, asking for either it's latest acquired data (QUERY) or
* asking for the widget to acquire and return new data (UPDATE_AND_QUERY). Currently, it deals
* with QUERY and UPDATE_AND_QUERY in exactly the same way.
*
* @param query DataObject containing the query request
* @param update Whether or not to acquire new data
* @param error String containing the incoming error value
* @return DataObject containing the reply to the query
*/
protected DataObject queryWidget(DataObject query, boolean update, String error) {
System.out.println(query);
DataObject result = null;
Vector v = new Vector();
if (update) {
result = new DataObject(UPDATE_AND_QUERY_REPLY, v);
} else {
result = new DataObject(QUERY_REPLY, v);
}
Attributes atts = new Attributes(query);
Error err = new Error(error);
if (err.getError() == null) {
if (atts == null) {
err.setError(Error.MISSING_PARAMETER_ERROR);
} else if (!canHandle(atts)) {
err.setError(Error.INVALID_ATTRIBUTE_ERROR);
}
}
if (err.getError() == null) {
Attributes subset = attributesCache.getSubset(atts);
if (subset.numAttributes() == 0) {
err.setError(Error.INVALID_DATA_ERROR);
} else {
v.addElement(subset.toDataObject());
if (subset.numAttributes() >= atts.numAttributes()) {
err.setError(Error.NO_ERROR);
} else {
err.setError(Error.INCOMPLETE_DATA_ERROR);
}
}
}
v.addElement(err.toDataObject());
return result;
}
/**
* This method converts the Callback object to a DataObject
*
* @return Callback object converted to a <CALLBACK> DataObject
*/
public DataObject toDataObject() {
DataObjects v = new DataObjects();
v.addElement(new DataObject(CALLBACK_NAME, name));
v.addElement(attributes.toDataObject());
return new DataObject(CALLBACK, v);
}