| /* |
| * Copyright (c) 2000, 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. |
| * |
| * 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 4429043 6526860 |
| * @summary Test position method of FileChannel |
| * @key randomness |
| */ |
| |
| import java.io.*; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.*; |
| import static java.nio.file.StandardOpenOption.*; |
| import java.nio.charset.Charset; |
| import java.util.Random; |
| |
| |
| /** |
| * Testing FileChannel's position method. |
| */ |
| |
| public class Position { |
| |
| private static final Charset ISO8859_1 = Charset.forName("8859_1"); |
| |
| private static final Random generator = new Random(); |
| |
| public static void main(String[] args) throws Exception { |
| Path blah = Files.createTempFile("blah", null); |
| blah.toFile().deleteOnExit(); |
| initTestFile(blah); |
| |
| for (int i=0; i<10; i++) { |
| try (FileChannel fc = (generator.nextBoolean()) ? |
| FileChannel.open(blah, READ) : |
| new FileInputStream(blah.toFile()).getChannel()) { |
| for (int j=0; j<100; j++) { |
| long newPos = generator.nextInt(1000); |
| fc.position(newPos); |
| if (fc.position() != newPos) |
| throw new RuntimeException("Position failed"); |
| } |
| } |
| } |
| |
| for (int i=0; i<10; i++) { |
| try (FileChannel fc = (generator.nextBoolean()) ? |
| FileChannel.open(blah, APPEND) : |
| new FileOutputStream(blah.toFile(), true).getChannel()) { |
| for (int j=0; j<10; j++) { |
| if (fc.position() != fc.size()) |
| throw new RuntimeException("Position expected to be size"); |
| byte[] buf = new byte[generator.nextInt(100)]; |
| fc.write(ByteBuffer.wrap(buf)); |
| } |
| } |
| } |
| |
| Files.delete(blah); |
| } |
| |
| /** |
| * Creates file blah: |
| * 0000 |
| * 0001 |
| * 0002 |
| * 0003 |
| * . |
| * . |
| * . |
| * 3999 |
| * |
| */ |
| private static void initTestFile(Path blah) throws IOException { |
| try (BufferedWriter awriter = Files.newBufferedWriter(blah, ISO8859_1)) { |
| for(int i=0; i<4000; i++) { |
| String number = new Integer(i).toString(); |
| for (int h=0; h<4-number.length(); h++) |
| awriter.write("0"); |
| awriter.write(""+i); |
| awriter.newLine(); |
| } |
| } |
| } |
| } |