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International Component for Unicode for Java (ICU4J) is a mature, widely used Java library providing Unicode and Globalization support
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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
/*
 *******************************************************************************
 * Copyright (C) 2009-2016, International Business Machines Corporation and
 * others. All Rights Reserved.
 *******************************************************************************
 */
package com.ibm.icu.impl;

import java.util.Collections;
import java.util.Map;

import com.ibm.icu.text.CurrencyDisplayNames;
import com.ibm.icu.text.DecimalFormatSymbols;
import com.ibm.icu.util.ULocale;

public class CurrencyData {
    public static final CurrencyDisplayInfoProvider provider;

    private CurrencyData() {}

    public static interface CurrencyDisplayInfoProvider {
        CurrencyDisplayInfo getInstance(ULocale locale, boolean withFallback);
        boolean hasData();
    }

    public static abstract class CurrencyDisplayInfo extends CurrencyDisplayNames {
        public abstract Map getUnitPatterns();
        public abstract CurrencyFormatInfo getFormatInfo(String isoCode);
        public abstract CurrencySpacingInfo getSpacingInfo();
    }

    public static final class CurrencyFormatInfo {
        public final String isoCode;
        public final String currencyPattern;
        public final String monetaryDecimalSeparator;
        public final String monetaryGroupingSeparator;

        public CurrencyFormatInfo(String isoCode, String currencyPattern, String monetarySeparator,
                String monetaryGroupingSeparator) {
            this.isoCode = isoCode;
            this.currencyPattern = currencyPattern;
            this.monetaryDecimalSeparator = monetarySeparator;
            this.monetaryGroupingSeparator = monetaryGroupingSeparator;
        }
    }

    public static final class CurrencySpacingInfo {
        private final String[][] symbols = new String[SpacingType.COUNT.ordinal()][SpacingPattern.COUNT.ordinal()];

        public boolean hasBeforeCurrency = false;
        public boolean hasAfterCurrency = false;

        public static enum SpacingType { BEFORE, AFTER, COUNT };
        public static enum SpacingPattern {
            CURRENCY_MATCH(DecimalFormatSymbols.CURRENCY_SPC_CURRENCY_MATCH),
            SURROUNDING_MATCH(DecimalFormatSymbols.CURRENCY_SPC_SURROUNDING_MATCH),
            INSERT_BETWEEN(DecimalFormatSymbols.CURRENCY_SPC_INSERT),
            COUNT;

            SpacingPattern() {}
            SpacingPattern(int value) { assert value == ordinal(); }
        };

        public CurrencySpacingInfo() {}

        public CurrencySpacingInfo(String... strings) {
            assert strings.length == 6;

            int k = 0;
            for (int i=0; i clzz = Class.forName("com.ibm.icu.impl.ICUCurrencyDisplayInfoProvider");
            temp = (CurrencyDisplayInfoProvider) clzz.newInstance();
        } catch (Throwable t) {
            temp = new CurrencyDisplayInfoProvider() {
                @Override
                public CurrencyDisplayInfo getInstance(ULocale locale, boolean withFallback) {
                    return DefaultInfo.getWithFallback(withFallback);
                }

                @Override
                public boolean hasData() {
                    return false;
                }
            };
        }
        provider = temp;
    }

    public static class DefaultInfo extends CurrencyDisplayInfo {
        private final boolean fallback;

        private DefaultInfo(boolean fallback) {
            this.fallback = fallback;
        }

        public static final CurrencyDisplayInfo getWithFallback(boolean fallback) {
            return fallback ? FALLBACK_INSTANCE : NO_FALLBACK_INSTANCE;
        }

        @Override
        public String getName(String isoCode) {
            return fallback ? isoCode : null;
        }

        @Override
        public String getPluralName(String isoCode, String pluralType) {
            return fallback ? isoCode : null;
        }

        @Override
        public String getSymbol(String isoCode) {
            return fallback ? isoCode : null;
        }

        @Override
        public String getNarrowSymbol(String isoCode) {
            return fallback ? isoCode : null;
        }

        @Override
        public String getFormalSymbol(String isoCode) {
            return fallback ? isoCode : null;
        }

        @Override
        public String getVariantSymbol(String isoCode) {
            return fallback ? isoCode : null;
        }

        @Override
        public Map symbolMap() {
            return Collections.emptyMap();
        }

        @Override
        public Map nameMap() {
            return Collections.emptyMap();
        }

        @Override
        public ULocale getULocale() {
            return ULocale.ROOT;
        }

        @Override
        public Map getUnitPatterns() {
            if (fallback) {
                return Collections.emptyMap();
            }
            return null;
        }

        @Override
        public CurrencyFormatInfo getFormatInfo(String isoCode) {
            return null;
        }

        @Override
        public CurrencySpacingInfo getSpacingInfo() {
            return fallback ? CurrencySpacingInfo.DEFAULT : null;
        }

        private static final CurrencyDisplayInfo FALLBACK_INSTANCE = new DefaultInfo(true);
        private static final CurrencyDisplayInfo NO_FALLBACK_INSTANCE = new DefaultInfo(false);
    }
}