public Builder forwardFileDestinations(final Collection<ForwardFileConfig> forwarderFileConfigs) {
            this.forwardFileDestinations.clear();
            if (forwarderFileConfigs != null) {
                this.forwardFileDestinations.addAll(forwarderFileConfigs);
            }
            return this;
        }
Builds a {@link PropertyPath} by merging parts onto the root {@link PropertyPath}
stroom-proxy/stroom-proxy-app/src/main/java/stroom/proxy/app/ProxyConfig.java