package org.apidesign.apifest08.currency;

 /**

  * Interface declaring method for computing conversion.

  * 

  * Because of a vague definition of currency amount's type,

  * the interface has a generic type.

  * 

  * @author ked

  * @see http://wiki.apidesign.org/wiki/APIDesignPatterns:ResponseReply

  */

 interface Computer<AmountType> {

     void compute(ComputerRequest<AmountType> request, ComputerResponse<AmountType> response);

     final class ComputerRequest<AmountType> {

         private AmountType input;

         private AmountType inputCurrencyRatio;

         private AmountType outputCurrencyRatio;

         AmountType getInput() {

             return input;

         }

         void setInput(AmountType input) {

             this.input = input;

         }

         AmountType getInputCurrencyRatio() {

             return inputCurrencyRatio;

         }

         void setInputCurrencyRatio(AmountType inputCurrencyRatio) {

             this.inputCurrencyRatio = inputCurrencyRatio;

         }

         AmountType getOutputCurrencyRatio() {

             return outputCurrencyRatio;

         }

         void setOutputCurrencyRatio(AmountType outputCurrencyRatio) {

             this.outputCurrencyRatio = outputCurrencyRatio;

         }

     }

     final class ComputerResponse<AmountType> {

         private AmountType result;

         AmountType getResult() {

             return result;

         }

         void setResult(AmountType result) {

             this.result = result;

         }

     }

 }