public DocxStamperConfiguration exposeInterfaceToExpressionLanguage(Class<?> interfaceClass, Object implementation) {
    this.expressionFunctions.put(interfaceClass, implementation);
    return this;
  }
public DocxStamperConfiguration exposeInterfaceToExpressionLanguage ( Class < ? > interfaceClass , Object implementation ) { this . expressionFunctions . put ( interfaceClass , implementation ) ; return this ; }
Exposes all methods of a given interface to the expression language.
@param interfaceClass the interface whose methods should be exposed in the expression language.
@param implementation  the implementation that should be called to evaluate invocations of the interface methods
within the expression language. Must implement the interface above.