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JSR 354 provides an API for representing, transporting, and performing comprehensive calculations with Money and Currency.

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/*
 * CREDIT SUISSE IS WILLING TO LICENSE THIS SPECIFICATION TO YOU ONLY UPON THE CONDITION THAT YOU
 * ACCEPT ALL OF THE TERMS CONTAINED IN THIS AGREEMENT. PLEASE READ THE TERMS AND CONDITIONS OF THIS
 * AGREEMENT CAREFULLY. BY DOWNLOADING THIS SPECIFICATION, YOU ACCEPT THE TERMS AND CONDITIONS OF
 * THE AGREEMENT. IF YOU ARE NOT WILLING TO BE BOUND BY IT, SELECT THE "DECLINE" BUTTON AT THE
 * BOTTOM OF THIS PAGE. Specification: JSR-354 Money and Currency API ("Specification") Copyright
 * (c) 2012-2013, Credit Suisse All rights reserved.
 */
package javax.money.spi;

import javax.money.MonetaryAmount;
import javax.money.MonetaryAmountFactory;
import javax.money.MonetaryException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Set;

/**
 * SPI (core) for the backing implementation of the {@link javax.money.Monetary} singleton. It
 * should load and manage (including contextual behavior), if needed) the different registered
 * {@link javax.money.MonetaryAmountFactory} instances.
 *
 * @author Anatole Tresch
 */
public interface MonetaryAmountsSingletonSpi{

    /**
     * Access the {@link javax.money.MonetaryAmountFactory} for the given {@code amountType} .
     *
     * @param amountType the {@link MonetaryAmount} implementation type, targeted by the factory.
     * @return the {@link javax.money.MonetaryAmountFactory}, or {@code null}, if no such
     * {@link javax.money.MonetaryAmountFactory} is available in the current context.
     */
     MonetaryAmountFactory getAmountFactory(Class amountType);

    /**
     * Access the default {@link MonetaryAmount} implementation type.
     *
     * @return a the default {@link MonetaryAmount} type corresponding, never {@code null}.
     * @throws MonetaryException if no {@link MonetaryAmountFactoryProviderSpi} is available, or no
     *                           {@link MonetaryAmountFactoryProviderSpi} targeting the configured default
     *                           {@link MonetaryAmount} type.
     * @see javax.money.Monetary#getDefaultAmountType()
     */
    Class getDefaultAmountType();

    /**
     * Get the currently registered {@link MonetaryAmount} implementation types.
     *
     * @return the {@link Set} if registered {@link MonetaryAmount} implementations, never
     * {@code null}.
     */
    Collection> getAmountTypes();


    /**
     * Access the default {@link javax.money.MonetaryAmountFactory}.
     *
     * @return a the default {@link MonetaryAmount} type corresponding, never {@code null}.
     * @throws MonetaryException if no {@link MonetaryAmountFactoryProviderSpi} is available, or no
     *                           {@link MonetaryAmountFactoryProviderSpi} targeting the configured default
     *                           {@link MonetaryAmount} type.
     * @see javax.money.Monetary#getDefaultAmountType()
     */
    default MonetaryAmountFactory getDefaultAmountFactory(){
        return getAmountFactory(getDefaultAmountType());
    }

    /**
     * Get the currently registered {@link MonetaryAmount} implementation classes.
     *
     * @return the {@link Set} if registered {@link MonetaryAmount} implementations, never
     * {@code null}.
     */
    default Collection> getAmountFactories(){
        List> factories = new ArrayList<>();
        for(Class type : getAmountTypes()){
            factories.add(getAmountFactory(type));
        }
        return factories;
    }

}