private void log(final Severity severity, final String message, final Exception e) {
        errorReceiverProxy.log(severity, locationFactory.create(locator), getElementId(), message, e);
    }
@param ch     An array of characters.
@param start  The starting position in the array.
@param length The number of characters to use from the array.
@throws SAXException The client may throw an exception during processing.
@see AbstractXMLFilter#characters(char[],
int, int)
stroom-state/stroom-planb-impl/src/main/java/stroom/planb/impl/pipeline/PlanBFilter.java