private boolean isDefaultFilterState() {
		String lowerText = lowerBoundField.getText();
		if (!minValue.equals(Double.valueOf(lowerText))) {
			return false;
		}

		String upperText = upperBoundField.getText();
		if (!maxValue.equals(Double.valueOf(upperText))) {
			return false;
		}

		return true;
	}
Subclasses should return the Double value that is being filtered.

@param t The t from which to extract the Double value
@return the double value that is being filtered; convert T to a double
Ghidra/Features/VersionTracking/src/main/java/ghidra/feature/vt/gui/provider/matchtable/AbstractDoubleRangeFilter.java