org.javamoney.moneta.internal.DefaultMonetaryAmountsSingletonSpi Maven / Gradle / Ivy

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

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/**
 * Copyright (c) 2012, 2014, Credit Suisse (Anatole Tresch), Werner Keil and others by the @author tag.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.javamoney.moneta.internal;

import javax.money.MonetaryAmount;
import javax.money.MonetaryAmountFactory;
import javax.money.MonetaryException;
import javax.money.spi.Bootstrap;
import javax.money.spi.MonetaryAmountFactoryProviderSpi;
import javax.money.spi.MonetaryAmountsSingletonSpi;

import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Default implementation ot {@link javax.money.spi.MonetaryAmountsSingletonSpi} loading the SPIs on startup
 * initially once, using the
 * JSR's {@link javax.money.spi.Bootstrap} mechanism.
 */
public class DefaultMonetaryAmountsSingletonSpi implements MonetaryAmountsSingletonSpi {

    private final Map, MonetaryAmountFactoryProviderSpi> factories =
            new ConcurrentHashMap<>();

    private Class configuredDefaultAmountType = loadDefaultAmountType();

    public DefaultMonetaryAmountsSingletonSpi() {
        for (MonetaryAmountFactoryProviderSpi f : Bootstrap.getServices(MonetaryAmountFactoryProviderSpi.class)) {
            factories.putIfAbsent(f.getAmountType(), f);
        }
    }

    /**
     * Tries to load the default {@link MonetaryAmount} class from
     * {@code javamoney.properties} with contents as follows:

     * 
     * javax.money.defaults.amount.class=my.fully.qualified.ClassName
     * 
     *
     * @return the loaded default class, or {@code null}
     */
    // type check should be safe, exception will be logged if not.
    private Class loadDefaultAmountType() {
        return null;
    }


    // save cast, since members are managed by this instance
    @SuppressWarnings("unchecked")
    @Override
    public  MonetaryAmountFactory getAmountFactory(Class amountType) {
        MonetaryAmountFactoryProviderSpi f = MonetaryAmountFactoryProviderSpi.class.cast(factories.get(amountType));
        if (Objects.nonNull(f)) {
            return f.createMonetaryAmountFactory();
        }
        throw new MonetaryException("No matching MonetaryAmountFactory found, type=" + amountType.getName());
    }

    @Override
    public Set> getAmountTypes() {
        return factories.keySet();
    }

    /*
     * (non-Javadoc)
     *
     * @see javax.money.spi.MonetaryAmountsSpi#getDefaultAmountType()
     */
    @Override
    public Class getDefaultAmountType() {
        if (Objects.isNull(configuredDefaultAmountType)) {
            for (MonetaryAmountFactoryProviderSpi f : Bootstrap.getServices(MonetaryAmountFactoryProviderSpi.class)) {
                if (f.getQueryInclusionPolicy() == MonetaryAmountFactoryProviderSpi.QueryInclusionPolicy.ALWAYS) {
                    configuredDefaultAmountType = f.getAmountType();
                    break;
                }
            }
        }
        return Optional.ofNullable(configuredDefaultAmountType)
                .orElseThrow(() -> new MonetaryException("No MonetaryAmountFactoryProviderSpi registered."));
    }

}