package org.apidesign.apifest08.currency;

import java.util.Currency;

/**

 * Abstract convertor implementation.

 * This class provide necessary stuff for creating any CurrencyConvertor

 * Convert value can be get by different way. Conversion should be made in its subclass.

 * @author Ladislav Vitasek

 */

abstract class AbstractCurrencyConvertor implements Convertor {

    protected final ConversionRatioProvider conversionRatioProvider;

    protected final Currency currency1;

    protected final Currency currency2;

    public AbstractCurrencyConvertor(Currency currency1, Currency currency2, ConversionRatioProvider conversionRatioProvider) {

        this.currency1 = currency1;

        this.currency2 = currency2;

        this.conversionRatioProvider = conversionRatioProvider;

    }

    public Currency getCurrency1() {

        return currency1;

    }

    public Currency getCurrency2() {

        return currency2;

    }

//    /**

//     * Conversion value can be get by Different way. Let's decide subclass where to get actual value

//     * @return current value of conversion constant

//     */

//    protected abstract BigDecimal getConversionValue();

    @SuppressWarnings({"RedundantIfStatement"})

    public boolean equals(Object o) {

        if (this == o) return true;

        if (o == null || getClass() != o.getClass()) return false;

        AbstractCurrencyConvertor that = (AbstractCurrencyConvertor) o;

        if (!conversionRatioProvider.equals(that.conversionRatioProvider)) return false;

        if (!currency1.equals(that.currency1)) return false;

        if (!currency2.equals(that.currency2)) return false;

        return true;

    }

    public int hashCode() {

        int result;

        result = conversionRatioProvider.hashCode();

        result = 31 * result + currency1.hashCode();

        result = 31 * result + currency2.hashCode();

        return result;

    }

    ConversionRatioProvider getConversionRatioProvider() {

        return conversionRatioProvider;

    }    

}