code: @Override
  	public void initialize() {
  		Map<String, Parameter> paramMap = new HashMap<>();
  		paramMap.putAll(buildConstParamMap());
  		paramMap.putAll(buildEnumConstParamMap());
  
  		constParameterMap = Collections.unmodifiableMap(paramMap);
  	}
docs: {@inheritDoc}
  
  @see jp.co.future.uroborosql.context.SqlContextFactory#initialize()