/*

 * Copyright (c) 2011, 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.

 *

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 */

/*

 * @test

 * @bug 4884238

 * @summary Test standard charset name constants.

 * @author Mike Duigou

 * @run main Standard

 */

import java.lang.reflect.Field;

import java.lang.reflect.Modifier;

import java.io.*;

import java.nio.charset.*;

import java.util.Arrays;

import java.util.HashSet;

import java.util.Set;

public class Standard {

    private final static String standardCharsets[] = {

        "US-ASCII", "ISO-8859-1", "UTF-8",

        "UTF-16BE", "UTF-16LE", "UTF-16" };

    public static void realMain(String[] args) {

        check(StandardCharsets.US_ASCII instanceof Charset);

        check(StandardCharsets.ISO_8859_1 instanceof Charset);

        check(StandardCharsets.UTF_8 instanceof Charset);

        check(StandardCharsets.UTF_16BE instanceof Charset);

        check(StandardCharsets.UTF_16LE instanceof Charset);

        check(StandardCharsets.UTF_16 instanceof Charset);

        check("US-ASCII".equals(StandardCharsets.US_ASCII.name()));

        check("ISO-8859-1".equals(StandardCharsets.ISO_8859_1.name()));

        check("UTF-8".equals(StandardCharsets.UTF_8.name()));

        check("UTF-16BE".equals(StandardCharsets.UTF_16BE.name()));

        check("UTF-16LE".equals(StandardCharsets.UTF_16LE.name()));

        check("UTF-16".equals(StandardCharsets.UTF_16.name()));

        Set<String> charsets = new HashSet<>();

        Field standardCharsetFields[] = StandardCharsets.class.getFields();

        for(Field charsetField : standardCharsetFields) {

            check(StandardCharsets.class == charsetField.getDeclaringClass());

            check(Modifier.isFinal(charsetField.getModifiers()));

            check(Modifier.isStatic(charsetField.getModifiers()));

            check(Modifier.isPublic(charsetField.getModifiers()));

            Object value;

            try {

                value = charsetField.get(null);

            } catch(IllegalAccessException failure) {

                unexpected(failure);

                continue;

            }

            check(value instanceof Charset);

            charsets.add(((Charset)value).name());

        }

        check(charsets.containsAll(Arrays.asList(standardCharsets)));

        charsets.removeAll(Arrays.asList(standardCharsets));

        check(charsets.isEmpty());

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() { passed++; }

    static void fail() { failed++; Thread.dumpStack(); }

    static void fail(String msg) { System.out.println(msg); fail(); }

    static void unexpected(Throwable t) { failed++; t.printStackTrace(); }

    static void check(boolean cond) { if (cond) pass(); else fail(); }

    static void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else {System.out.println(x + " not equal to " + y); fail();}}

    static void equal2(Object x, Object y) {equal(x, y); equal(y, x);}

    public static void main(String[] args) throws Throwable {

        try { realMain(args); } catch (Throwable t) { unexpected(t); }

        System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);

        if (failed > 0) throw new Exception("Some tests failed");

    }

    private static abstract class Fun {abstract void f() throws Throwable;}

    private static void THROWS(Class<? extends Throwable> k, Fun... fs) {

          for (Fun f : fs)

              try { f.f(); fail("Expected " + k.getName() + " not thrown"); }

              catch (Throwable t) {

                  if (k.isAssignableFrom(t.getClass())) pass();

                  else unexpected(t);}}

    static byte[] serializedForm(Object obj) {

        try {

            ByteArrayOutputStream baos = new ByteArrayOutputStream();

            new ObjectOutputStream(baos).writeObject(obj);

            return baos.toByteArray();

        } catch (IOException e) { throw new Error(e); }}

    static Object readObject(byte[] bytes)

        throws IOException, ClassNotFoundException {

        InputStream is = new ByteArrayInputStream(bytes);

        return new ObjectInputStream(is).readObject();}

    @SuppressWarnings("unchecked")

    static <T> T serialClone(T obj) {

        try { return (T) readObject(serializedForm(obj)); }

        catch (Exception e) { throw new Error(e); }}

}