Java example source code file (NumberFormatProviderTest.java)

This example Java source code file (NumberFormatProviderTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

currency, decimalformat, foonumberformat, hashset, illegalargumentexception, list, locale, messageformat, number_patterns, numberformat, numberformatprovidertest, runtimeexception, set, string, text, util

The NumberFormatProviderTest.java Java example source code

/*
 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/*
 *
 */

import java.text.*;
import java.util.*;
import sun.util.locale.provider.*;
import sun.util.resources.*;

import com.foo.FooNumberFormat;

public class NumberFormatProviderTest extends ProviderTest {

    com.foo.NumberFormatProviderImpl nfp = new com.foo.NumberFormatProviderImpl();
    List<Locale> availloc = Arrays.asList(NumberFormat.getAvailableLocales());
    List<Locale> providerloc = Arrays.asList(nfp.getAvailableLocales());
    List<Locale> jreloc = Arrays.asList(LocaleProviderAdapter.forJRE().getAvailableLocales());
    List<Locale> jreimplloc = Arrays.asList(LocaleProviderAdapter.forJRE().getNumberFormatProvider().getAvailableLocales());

    public static void main(String[] s) {
        new NumberFormatProviderTest();
    }

    NumberFormatProviderTest() {
        availableLocalesTest();
        objectValidityTest();
        messageFormatTest();
    }

    void availableLocalesTest() {
        Set<Locale> localesFromAPI = new HashSet<>(availloc);
        Set<Locale> localesExpected = new HashSet<>(jreloc);
        localesExpected.addAll(providerloc);
        if (localesFromAPI.equals(localesExpected)) {
            System.out.println("availableLocalesTest passed.");
        } else {
            throw new RuntimeException("availableLocalesTest failed");
        }
    }

    void objectValidityTest() {

        for (Locale target: availloc) {
            boolean jreSupportsLocale = jreimplloc.contains(target);

            // JRE string arrays
            String[] jreNumberPatterns = null;
            if (jreSupportsLocale) {
                jreNumberPatterns = LocaleProviderAdapter.forJRE().getLocaleResources(target).getNumberPatterns();
            }

            // result object
            String resultCur = getPattern(NumberFormat.getCurrencyInstance(target));
            String resultInt = getPattern(NumberFormat.getIntegerInstance(target));
            String resultNum = getPattern(NumberFormat.getNumberInstance(target));
            String resultPer = getPattern(NumberFormat.getPercentInstance(target));

            // provider's object (if any)
            String providersCur = null;
            String providersInt = null;
            String providersNum = null;
            String providersPer = null;
            if (providerloc.contains(target)) {
                NumberFormat dfCur = nfp.getCurrencyInstance(target);
                if (dfCur != null) {
                    providersCur = getPattern(dfCur);
                }
                NumberFormat dfInt = nfp.getIntegerInstance(target);
                if (dfInt != null) {
                    providersInt = getPattern(dfInt);
                }
                NumberFormat dfNum = nfp.getNumberInstance(target);
                if (dfNum != null) {
                    providersNum = getPattern(dfNum);
                }
                NumberFormat dfPer = nfp.getPercentInstance(target);
                if (dfPer != null) {
                    providersPer = getPattern(dfPer);
                }
            }

            // JRE's object (if any)
            // note that this totally depends on the current implementation
            String jresCur = null;
            String jresInt = null;
            String jresNum = null;
            String jresPer = null;
            if (jreSupportsLocale) {
                DecimalFormat dfCur = new DecimalFormat(jreNumberPatterns[1],
                    DecimalFormatSymbols.getInstance(target));
                if (dfCur != null) {
                    adjustForCurrencyDefaultFractionDigits(dfCur);
                    jresCur = dfCur.toPattern();
                }
                DecimalFormat dfInt = new DecimalFormat(jreNumberPatterns[0],
                    DecimalFormatSymbols.getInstance(target));
                if (dfInt != null) {
                    dfInt.setMaximumFractionDigits(0);
                    dfInt.setDecimalSeparatorAlwaysShown(false);
                    dfInt.setParseIntegerOnly(true);
                    jresInt = dfInt.toPattern();
                }
                DecimalFormat dfNum = new DecimalFormat(jreNumberPatterns[0],
                    DecimalFormatSymbols.getInstance(target));
                if (dfNum != null) {
                    jresNum = dfNum.toPattern();
                }
                DecimalFormat dfPer = new DecimalFormat(jreNumberPatterns[2],
                    DecimalFormatSymbols.getInstance(target));
                if (dfPer != null) {
                    jresPer = dfPer.toPattern();
                }
            }

            checkValidity(target, jresCur, providersCur, resultCur, jreSupportsLocale);
            checkValidity(target, jresInt, providersInt, resultInt, jreSupportsLocale);
            checkValidity(target, jresNum, providersNum, resultNum, jreSupportsLocale);
            checkValidity(target, jresPer, providersPer, resultPer, jreSupportsLocale);
        }
    }

    /**
     * Adjusts the minimum and maximum fraction digits to values that
     * are reasonable for the currency's default fraction digits.
     */
    void adjustForCurrencyDefaultFractionDigits(DecimalFormat df) {
        DecimalFormatSymbols dfs = df.getDecimalFormatSymbols();
        Currency currency = dfs.getCurrency();
        if (currency == null) {
            try {
                currency = Currency.getInstance(dfs.getInternationalCurrencySymbol());
            } catch (IllegalArgumentException e) {
            }
        }
        if (currency != null) {
            int digits = currency.getDefaultFractionDigits();
            if (digits != -1) {
                int oldMinDigits = df.getMinimumFractionDigits();
                // Common patterns are "#.##", "#.00", "#".
                // Try to adjust all of them in a reasonable way.
                if (oldMinDigits == df.getMaximumFractionDigits()) {
                    df.setMinimumFractionDigits(digits);
                    df.setMaximumFractionDigits(digits);
                } else {
                    df.setMinimumFractionDigits(Math.min(digits, oldMinDigits));
                    df.setMaximumFractionDigits(digits);
                }
            }
        }
    }

    private static String getPattern(NumberFormat nf) {
        if (nf instanceof DecimalFormat) {
            return ((DecimalFormat)nf).toPattern();
        }
        if (nf instanceof FooNumberFormat) {
            return ((FooNumberFormat)nf).toPattern();
        }
        return null;
    }

    private static final String[] NUMBER_PATTERNS = {
        "num={0,number}",
        "num={0,number,currency}",
        "num={0,number,percent}",
        "num={0,number,integer}"
    };

    void messageFormatTest() {
        for (Locale target : providerloc) {
            for (String pattern : NUMBER_PATTERNS) {
                MessageFormat mf = new MessageFormat(pattern, target);
                String toPattern = mf.toPattern();
                if (!pattern.equals(toPattern)) {
                    throw new RuntimeException("MessageFormat.toPattern: got '"
                                               + toPattern
                                               + "', expected '" + pattern + "'");
                }
            }
        }
    }
}