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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. This module provides the test code that is compatible with both the Java 7 and the Java 8 based API. The targeted API must be provided as well as the implementation under test to execute this TCK.
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/*
 * Copyright (c) 2012, 2013, Werner Keil, Credit Suisse (Anatole Tresch). 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. Contributors: Anatole Tresch - initial version.
 */
package org.javamoney.tck.tests.internal;

import javax.money.CurrencyUnit;
import javax.money.MonetaryAmount;
import javax.money.MonetaryRounding;
import javax.money.RoundingContext;
import javax.money.RoundingContextBuilder;
import javax.money.RoundingQuery;
import javax.money.spi.RoundingProviderSpi;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * Test ExchangeProvider. Created by Anatole on 26.04.2014.
 */
public class TestRoundingProvider implements RoundingProviderSpi {

    private static final RoundingContext CONTEXT =
            RoundingContextBuilder.of(TestRoundingProvider.class.getSimpleName(), "NOSCALE").build();
    private static final RoundingContext CONTEXT_CASH =
            RoundingContextBuilder.of(TestRoundingProvider.class.getSimpleName(), "cashRounding").build();

    private Map customRoundings = new HashMap<>();

    public TestRoundingProvider() {
        customRoundings.put("NOSCALE", new MonetaryRounding() {
            @Override
            public RoundingContext getRoundingContext() {
                return CONTEXT;
            }

            @Override
            public MonetaryAmount apply(MonetaryAmount value) {
                return value.getFactory()
                        .setNumber(value.getNumber().numberValue(BigDecimal.class).setScale(0, RoundingMode.HALF_EVEN))
                        .create();
            }
        });
    }

    @Override
    public MonetaryRounding getRounding(RoundingQuery context) {
        MonetaryRounding customRounding = customRoundings.get(context.getRoundingName());
        if (customRounding != null) {
            return customRounding;
        }
        if (context.getCurrency() == null) {
            return null;
        }
        Boolean cashRounding = context.getBoolean("cashRounding");
        if(cashRounding==null) {
            cashRounding = Boolean.FALSE;
        }
        Calendar timestamp = context.get(Calendar.class);
        if (cashRounding) {
            if (timestamp != null) {
                return getCashRounding(context.getCurrency(), timestamp);
            }
            return getCashRounding(context.getCurrency());
        } else {
            if ("XAU".equals(context.getCurrency().getCurrencyCode())) {
                if (timestamp != null) {
                    return new MonetaryRounding() {
                        @Override
                        public RoundingContext getRoundingContext() {
                            return CONTEXT;
                        }

                        @Override
                        public MonetaryAmount apply(MonetaryAmount value) {
                            return value.getFactory().setNumber(
                                    value.getNumber().numberValue(BigDecimal.class).setScale(2, RoundingMode.UP))
                                    .create();
                        }
                    };
                }
                return new MonetaryRounding() {
                    @Override
                    public RoundingContext getRoundingContext() {
                        return CONTEXT;
                    }

                    @Override
                    public MonetaryAmount apply(MonetaryAmount value) {
                        return value.getFactory()
                                .setNumber(value.getNumber().numberValue(BigDecimal.class).setScale(4, RoundingMode.UP))
                                .create();
                    }
                };
            }
        }
        return null;
    }


    private MonetaryRounding getCashRounding(CurrencyUnit currency) {
        if ("XAU".equals(currency.getCurrencyCode())) {
            return new MonetaryRounding() {
                @Override
                public RoundingContext getRoundingContext() {
                    return CONTEXT_CASH;
                }

                @Override
                public MonetaryAmount apply(MonetaryAmount value) {
                    return value.getFactory()
                            .setNumber(value.getNumber().numberValue(BigDecimal.class).setScale(1, RoundingMode.DOWN))
                            .create();
                }
            };
        }
        return null;
    }

    private MonetaryRounding getCashRounding(CurrencyUnit currency, Calendar timestamp) {
        if ("XAU".equals(currency.getCurrencyCode()) && timestamp.get(Calendar.YEAR) < 1972) {
            return new MonetaryRounding() {
                @Override
                public RoundingContext getRoundingContext() {
                    return CONTEXT_CASH;
                }

                @Override
                public MonetaryAmount apply(MonetaryAmount value) {
                    return value.getFactory()
                            .setNumber(value.getNumber().numberValue(BigDecimal.class).setScale(2, RoundingMode.DOWN))
                            .create();
                }
            };
        }
        return null;
    }

    @Override
    public Set getRoundingNames() {
        return customRoundings.keySet();
    }

    @Override
    public String getProviderName() {
        return getClass().getSimpleName();
    }
}