Java example source code file (StreamEncoderClose.java)

This example Java source code file (StreamEncoderClose.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

bytearrayoutputstream, can\'t, close, failed, ioexception, iso\-2022\-jp, mybufferedoutputstream, outputstreamwriter, printwriter, streamencoderclose, string

The StreamEncoderClose.java Java example source code

/*
 * Copyright (c) 2008, 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.
 */

/* @test
   @bug 5005426
   @summary Check if StreamEncoder close() method works correctly from
            error recovery after the underneath OutputStream failed to
            close the first time.
 */

import java.io.*;
public class StreamEncoderClose {
    public static void main( String arg[] ) throws Exception {
        byte[] expected = {(byte)0x1b,(byte)0x24,(byte)0x42,
                           (byte)0x30,(byte)0x6c,
                           (byte)0x1b,(byte)0x28,(byte)0x42};
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        MyBufferedOutputStream mbos = new MyBufferedOutputStream(baos);
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(mbos, "ISO-2022-JP"));
        mbos.dontClose();
        pw.write("\u4e00");
        pw.close();             //  1st PrintWriter Close
        mbos.canClose();
        pw.close();             //  2nd PrintWriter Close

        //double check, probably not necessary
        byte[] out = baos.toByteArray();
        if (out.length != expected.length) {
            throw new IOException("Failed");
        }
        for (int i = 0; i < out.length; i++) {
            //System.out.printf("(byte)0x%x,", out[i] & 0xff);
            if (out[i] != expected[i])
                throw new IOException("Failed");
        }
    }

    static class MyBufferedOutputStream extends BufferedOutputStream {
        MyBufferedOutputStream(OutputStream os) {
            super(os);
        }
        private boolean status;
        public void dontClose() {
            status = false;
        }
        public void canClose() {
            status = true;
        }
        public void close() throws IOException {
            if ( status == false ) {
                throw new IOException("Can't close ");
            }
            super.close();
        }
    }
}