/* * Copyright (c) 2021, 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.io.IOException; import java.io.Reader; import java.io.StringReader; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.ReadOnlyBufferException; /* * @test * @bug 8266078 * @summary Tests that attempting to read into a read-only CharBuffer * does not advance the Reader position * @run main ReadIntoReadOnlyBuffer */ public class ReadIntoReadOnlyBuffer { private static final String THE_STRING = "123"; public static void main(String[] args) throws Exception { CharBuffer buf = CharBuffer.allocate(8).asReadOnlyBuffer(); StringReader r = new StringReader(THE_STRING); read(r, buf); buf = ByteBuffer.allocateDirect(16).asCharBuffer().asReadOnlyBuffer(); r = new StringReader(THE_STRING); read(r, buf); } private static void read(Reader r, CharBuffer b) throws IOException { try { r.read(b); throw new RuntimeException("ReadOnlyBufferException expected"); } catch (ReadOnlyBufferException expected) { } char[] c = new char[3]; int n = r.read(c); if (n != c.length) { throw new RuntimeException("Expected " + c.length + ", got " + n); } String s = new String(c); if (!s.equals(THE_STRING)) { throw new RuntimeException("Expected " + THE_STRING + ", got " + s); } } }