@Override
        protected List<T> withPrefix(String prefix, ConfigKey key, Properties properties) {
            List<String> strings = extractFromPropertiesAsList(key.asPropertyKey(prefix), properties);
            if(strings == null) {
                return null;
            }
            return process(strings);
        }
Data type-specific extractor to read value from properties.

@param prefix
@param key
@param properties
@return
src/main/java/io/fabric8/maven/docker/config/handler/property/ValueProvider.java