/** @return immediately calculated value or null if async calculation has been started */
private String calculateValue(final int requestNumber) {
Optional<DialogLogic.PreviewContext> evaluatorOptional = previewContextValue.getValue();
if (!evaluatorOptional.isNormal()) {
return ""; //$NON-NLS-1$
}
DialogLogic.PreviewContext previewContext = evaluatorOptional.getNormal();
Optional<DialogLogic.Expression> expressionOptional = parsedExpressionValue.getValue();
if (!expressionOptional.isNormal()) {
return ""; //$NON-NLS-1$
}
DialogLogic.Expression expression = expressionOptional.getNormal();
Expression.PreviewCallback callback =
new Expression.PreviewCallback() {
@Override
public void done(String message, String additionalWarning) {
synchronized (monitor) {
if (monitor.requestId != requestNumber) {
return;
}
monitor.currentValue = message;
monitor.additionalWarning = additionalWarning;
updater.reportChanged(CheckerResultProcessor.this);
updater.reportChanged(warningSource);
updater.updateAsync();
}
}
};
expression.doPreview(previewContext, callback);
return null;
}
@Override
public void run() {
Expression.SetCallback callback =
new Expression.SetCallback() {
@Override
public void done(final String errorMessage) {
if (errorMessage == null) {
if (addWatchExpression) {
IExpressionManager expressionManager =
DebugPlugin.getDefault().getExpressionManager();
IWatchExpression watchExpression =
expressionManager.newWatchExpression(expression.getWatchExpression());
expressionManager.addExpression(watchExpression);
}
} else {
parentShell
.getDisplay()
.asyncExec(
new Runnable() {
@Override
public void run() {
MessageBox messageBox = new MessageBox(parentShell);
messageBox.setText(Messages.LogicImpl_RESULT_FAILURE_TITLE);
messageBox.setMessage(errorMessage);
messageBox.open();
}
});
}
}
};
expression.execute(previewContext, callback);
}