/**
* This method stores the attribute name values, both in persistent storage and in local storage.
*
* @param atts AttributeNameValues to store
*/
public void storeAttributeNameValues(Attributes atts) {
store(atts);
AttributeNameValue time = atts.getAttributeNameValue(TIMESTAMP);
long timestamp = 0;
if (time != null) {
Long l = new Long((String) time.getValue());
if (l != null) timestamp = l.longValue();
else {
System.out.println("ERROR: in <storeAttributeNameValues> timestamp null");
}
}
for (int i = 0; i < atts.numAttributes(); i++) {
AttributeNameValue attNew = (AttributeNameValue) atts.getAttributeAt(i);
String attName = attNew.getName();
Object o = attributesTimes.get(attName);
long storedTime = -1;
if (o != null) storedTime = ((Long) o).longValue();
else System.out.println("ERROR: in <storeAttributeNameValues> storedTime null");
if (storedTime != -1 && storedTime <= timestamp) {
AttributeNameValue attOld = attributesCache.getAttributeNameValue(attName);
attOld.setValue(attNew.getValue());
}
}
}
/**
* This method is called to aggregate the list of constant attributes that the widgets relevant to
* this server provide. This should be called after a constructor sets the widget handles to use
* or after setWidgets() has been called.
*
* @return AttributeNameValues the server constant attributes
*/
protected Attributes initConstantAttributes() {
// this protects us against the Widget constructor
// that calls us too early (we havent' got the widgets yet)
// it's good practice anyway
if (widgets == null) {
return null;
}
Attributes atts = new Attributes();
for (int i = 0; i < widgets.size(); i++) {
WidgetHandle handle = widgets.getWidgetHandleAt(i);
DataObject widgetAtts =
getWidgetConstantAttributes(handle.getHostName(), handle.getPort(), handle.getId());
String error = new Error(widgetAtts).getError();
if (error != null) {
if (error.equals(Error.NO_ERROR)) {
Attributes wAtts = new Attributes(widgetAtts);
for (int j = 0; j < wAtts.numAttributes(); j++) {
AttributeNameValue wAtt = (AttributeNameValue) wAtts.getAttributeAt(j);
if (atts.getAttributeNameValue(wAtt.getName()) == null) {
atts.addAttributeNameValue(wAtt);
}
}
}
}
}
atts.addAttributes(setServerConstantAttributes());
return atts;
}
/**
* This method checks the list of incoming attributes to ensure that the interpreter can handle
* these attributes.
*
* @param inAtts List of incoming attributes to check
* @return whether the list of attributes is valid
*/
private boolean canHandle(Attributes inAtts) {
for (int i = 0; i < inAtts.numAttributes(); i++) {
Attribute inAtt = inAtts.getAttributeAt(i);
if (!isInAttribute(inAtt.getName())) {
return false;
}
}
return true;
}
/**
* 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;
}
