// Hide\display the additional CEP widget is appropriate
private void operatorChanged(OperatorSelection selection) {
parametersContainer.clear();
String operator = selection.getValue();
if (CEPOracle.isCEPWindowOperatorTime(operator)) {
AbstractRestrictedEntryTextBox txt = new CEPTimeParameterTextBox(hcw.getWindow(), 1);
initialiseTextBox(txt);
} else if (CEPOracle.isCEPWindowOperatorLength(operator)) {
AbstractRestrictedEntryTextBox txt = new CEPLengthParameterTextBox(hcw.getWindow(), 1);
initialiseTextBox(txt);
} else {
parametersContainer.setVisible(false);
hcw.getWindow().clearParameters();
}
}
// Actual drop-down
private Widget getDropDown() {
String selected = "";
String selectedText = "";
box = new ListBox();
box.setEnabled(!isReadOnly);
box.addItem(HumanReadableConstants.INSTANCE.noCEPWindow(), "");
for (int i = 0; i < operators.size(); i++) {
String op = operators.get(i);
box.addItem(HumanReadable.getOperatorDisplayName(op), op);
if (op.equals(hcw.getWindow().getOperator())) {
selected = op;
selectedText = HumanReadable.getOperatorDisplayName(op);
box.setSelectedIndex(i + 1);
}
}
selectItem(hcw.getWindow().getOperator());
// Fire event to ensure parent Widgets correct their state depending on selection
final HasValueChangeHandlers<OperatorSelection> source = this;
final OperatorSelection selection = new OperatorSelection(selected, selectedText);
Scheduler.get()
.scheduleFinally(
new Command() {
public void execute() {
operatorChanged(selection);
ValueChangeEvent.fire(source, selection);
}
});
// Signal parent Widget whenever a change happens
box.addChangeHandler(
new ChangeHandler() {
public void onChange(ChangeEvent event) {
String selected = box.getValue(box.getSelectedIndex());
String selectedText = box.getItemText(box.getSelectedIndex());
OperatorSelection selection = new OperatorSelection(selected, selectedText);
operatorChanged(selection);
ValueChangeEvent.fire(source, selection);
}
});
return box;
}
private void initialiseTextBox(AbstractRestrictedEntryTextBox txt) {
String key = String.valueOf(1);
String value = hcw.getWindow().getParameter(key);
if (value == null) {
value = "";
hcw.getWindow().setParameter(key, value);
}
if (!txt.isValidValue(value, false)) {
value = "";
hcw.getWindow().setParameter(key, value);
}
txt.setText(value);
txt.setEnabled(!isReadOnly);
parametersContainer.add(txt);
parametersContainer.setVisible(true);
hcw.getWindow()
.setParameter(
SharedConstants.OPERATOR_PARAMETER_GENERATOR, CEP_OPERATOR_PARAMETER_GENERATOR);
}