/*

 * Copyright (c) 2010, 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

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 * questions.

 */

/* @test

 * @bug 6227608

 * @summary Test proper handling of flush()

 * @author Martin Buchholz

 */

import java.util.*;

import java.io.*;

import java.nio.*;

import java.nio.charset.*;

public class Flush {

    private static byte[] contents(ByteBuffer bb) {

        byte[] contents = new byte[bb.position()];

        bb.duplicate().flip().get(contents);

        return contents;

    }

    private static ByteBuffer extend(ByteBuffer bb) {

        ByteBuffer x = ByteBuffer.allocate(2*bb.capacity()+10);

        bb.flip();

        x.put(bb);

        return x;

    }

    private static void realMain(String[] args) throws Throwable {

        // A japanese character should decode as a 3-byte

        // switch-to-japanese escape sequence, followed by a 2-byte

        // encoding of the char itself, followed by a 3-byte return to

        // ASCII escape sequence.

        char[] jis0208 = {'\u3001'};

        CharBuffer cb = CharBuffer.wrap(jis0208);

        ByteBuffer bb = ByteBuffer.allocate(6);

        CharsetEncoder enc = Charset.forName("ISO-2022-JP").newEncoder();

        check(enc.encode(cb, bb, true).isUnderflow());

        System.out.println(Arrays.toString(contents(bb)));

        check(! cb.hasRemaining());

        equal(contents(bb).length, 3 + 2);

        equal(bb.get(0), (byte)0x1b);

        //----------------------------------------------------------------

        // We must be able to recover if flush() returns OVERFLOW

        //----------------------------------------------------------------

        check(enc.flush(bb).isOverflow());

        check(enc.flush(bb).isOverflow());

        equal(contents(bb).length, 3 + 2);

        bb = extend(bb);

        check(enc.flush(bb).isUnderflow());

        equal(bb.get(3 + 2), (byte)0x1b);

        System.out.println(Arrays.toString(contents(bb)));

        equal(contents(bb).length, 3 + 2 + 3);

        //----------------------------------------------------------------

        // A final redundant flush() is a no-op

        //----------------------------------------------------------------

        check(enc.flush(bb).isUnderflow());

        check(enc.flush(bb).isUnderflow());

        equal(contents(bb).length, 3 + 2 + 3);

        //----------------------------------------------------------------

        // CharsetEncoder.encode(ByteBuffer) must call flush(ByteBuffer)

        //----------------------------------------------------------------

        bb = enc.encode(CharBuffer.wrap(jis0208));

        byte[] expected = "\u001b$B!\"\u001b(B".getBytes("ASCII");

        byte[] contents = new byte[bb.limit()]; bb.get(contents);

        check(Arrays.equals(contents, expected));

    }

    //--------------------- 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(); }}

    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");

    }

}