| /* |
| * Copyright (c) 2000, 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 |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* @test |
| * @bug 4862411 |
| * @summary Test positional write method of FileChannel |
| * @key randomness |
| */ |
| |
| import java.io.*; |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.channels.*; |
| import java.nio.channels.FileChannel; |
| import java.util.Random; |
| |
| |
| /** |
| * Testing FileChannel's positional write method. |
| */ |
| public class Pwrite { |
| |
| private static Random generator = new Random(); |
| |
| private static File blah; |
| |
| public static void main(String[] args) throws Exception { |
| genericTest(); |
| testUnwritableChannel(); |
| } |
| |
| // This test for bug 4862411 |
| private static void testUnwritableChannel() throws Exception { |
| File blah = File.createTempFile("blah2", null); |
| blah.deleteOnExit(); |
| FileOutputStream fos = new FileOutputStream(blah); |
| fos.write(new byte[128]); |
| fos.close(); |
| FileInputStream fis = new FileInputStream(blah); |
| FileChannel fc = fis.getChannel(); |
| try { |
| fc.write(ByteBuffer.allocate(256),1); |
| throw new RuntimeException("Expected exception not thrown"); |
| } catch(NonWritableChannelException e) { |
| // Correct result |
| } finally { |
| fc.close(); |
| blah.delete(); |
| } |
| } |
| |
| private static void genericTest() throws Exception { |
| StringBuffer sb = new StringBuffer(); |
| sb.setLength(4); |
| |
| blah = File.createTempFile("blah", null); |
| blah.deleteOnExit(); |
| initTestFile(blah); |
| |
| RandomAccessFile raf = new RandomAccessFile(blah, "rw"); |
| FileChannel c = raf.getChannel(); |
| |
| for (int x=0; x<100; x++) { |
| long offset = generator.nextInt(1000); |
| ByteBuffer bleck = ByteBuffer.allocateDirect(4); |
| |
| // Write known sequence out |
| for (byte i=0; i<4; i++) { |
| bleck.put(i); |
| } |
| bleck.flip(); |
| long originalPosition = c.position(); |
| int totalWritten = 0; |
| while (totalWritten < 4) { |
| int written = c.write(bleck, offset); |
| if (written < 0) |
| throw new Exception("Read failed"); |
| totalWritten += written; |
| } |
| |
| long newPosition = c.position(); |
| |
| // Ensure that file pointer position has not changed |
| if (originalPosition != newPosition) |
| throw new Exception("File position modified"); |
| |
| // Attempt to read sequence back in |
| bleck = ByteBuffer.allocateDirect(4); |
| originalPosition = c.position(); |
| int totalRead = 0; |
| while (totalRead < 4) { |
| int read = c.read(bleck, offset); |
| if (read < 0) |
| throw new Exception("Read failed"); |
| totalRead += read; |
| } |
| newPosition = c.position(); |
| |
| // Ensure that file pointer position has not changed |
| if (originalPosition != newPosition) |
| throw new Exception("File position modified"); |
| |
| for (byte i=0; i<4; i++) { |
| if (bleck.get(i) != i) |
| throw new Exception("Write test failed"); |
| } |
| } |
| c.close(); |
| raf.close(); |
| blah.delete(); |
| } |
| |
| /** |
| * Creates file blah: |
| * 0000 |
| * 0001 |
| * 0002 |
| * 0003 |
| * . |
| * . |
| * . |
| * 3999 |
| * |
| * Blah extends beyond a single page of memory so that the |
| * ability to index into a file of multiple pages is tested. |
| */ |
| private static void initTestFile(File blah) throws Exception { |
| FileOutputStream fos = new FileOutputStream(blah); |
| BufferedWriter awriter |
| = new BufferedWriter(new OutputStreamWriter(fos, "8859_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(); |
| } |
| awriter.flush(); |
| awriter.close(); |
| } |
| } |