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;

        }

    }

}